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gerrit-public.fairphone.software / platform / docs / source.android.com / b183b325ff050f1c21b28335788425c02402c0d3 / . / src / compatibility / 5.1 / android-5.1-cdd.html
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Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1<!DOCTYPE html>
2<head>
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]3<title>Android 5.1 Compatibility Definition</title>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4<link rel="stylesheet" type="text/css" href="android-cdd.css"/>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]5</head>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]6
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]7<body>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]8
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]9<h6>Table of Contents</h6>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]10
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]11<div id="toc">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]12
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]13<div id="toc_left">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]14
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]15<p class="toc_h1"><a href="#1_introduction">1. Introduction</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]16
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]17<p class="toc_h1"><a href="#2_device_types">2. Device Types</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]18
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]19<p class="toc_h2"><a href="#2_1_device_configurations">2.1 Device Configurations</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]20
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]21<p class="toc_h1"><a href="#3_software">3. Software</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]22
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]23<p class="toc_h2"><a href="#3_1_managed_api_compatibility">3.1. Managed API Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]24
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]25<p class="toc_h2"><a href="#3_2_soft_api_compatibility">3.2. Soft API Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]26
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]27<p class="toc_h3"><a href="#3_2_1_permissions">3.2.1. Permissions</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]28
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]29<p class="toc_h3"><a href="#3_2_2_build_parameters">3.2.2. Build Parameters</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]30
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]31<p class="toc_h3"><a href="#3_2_3_intent_compatibility">3.2.3. Intent Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]32
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]33<p class="toc_h4"><a href="#3_2_3_1_core_application_intents">3.2.3.1. Core Application Intents</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]34
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]35<p class="toc_h4"><a href="#3_2_3_2_intent_overrides">3.2.3.2. Intent Overrides</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]36
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]37<p class="toc_h4"><a href="#3_2_3_3_intent_namespaces">3.2.3.3. Intent Namespaces</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]38
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]39<p class="toc_h4"><a href="#3_2_3_4_broadcast_intents">3.2.3.4. Broadcast Intents</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]40
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]41<p class="toc_h4"><a href="#3_2_3_5_default_app_settings">3.2.3.5. Default App Settings</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]42
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]43<p class="toc_h2"><a href="#3_3_native_api_compatibility">3.3. Native API Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]44
Unsuk Junga16d5c72015-06-05 02:10:14 -0700[diff] [blame]45<p class="toc_h3"><a href="#3_3_1_application_binary_interfaces">3.3.1. Application Binary Interfaces</a></p>
46
47<p class="toc_h3"><a href="#3_3_2_32-bit_arm_native_code_compatibility">3.3.2. 32-bit ARM Native Code Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]48
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]49<p class="toc_h2"><a href="#3_4_web_compatibility">3.4. Web Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]50
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]51<p class="toc_h3"><a href="#3_4_1_webview_compatibility">3.4.1. WebView Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]52
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]53<p class="toc_h3"><a href="#3_4_2_browser_compatibility">3.4.2. Browser Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]54
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]55<p class="toc_h2"><a href="#3_5_api_behavioral_compatibility">3.5. API Behavioral Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]56
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]57<p class="toc_h2"><a href="#3_6_api_namespaces">3.6. API Namespaces</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]58
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]59<p class="toc_h2"><a href="#3_7_runtime_compatibility">3.7. Runtime Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]60
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]61<p class="toc_h2"><a href="#3_8_user_interface_compatibility">3.8. User Interface Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]62
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]63<p class="toc_h3"><a href="#3_8_1_launcher_home_screen">3.8.1. Launcher (Home Screen)</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]64
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]65<p class="toc_h3"><a href="#3_8_2_widgets">3.8.2. Widgets</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]66
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]67<p class="toc_h3"><a href="#3_8_3_notifications">3.8.3. Notifications</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]68
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]69<p class="toc_h3"><a href="#3_8_4_search">3.8.4. Search</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]70
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]71<p class="toc_h3"><a href="#3_8_5_toasts">3.8.5. Toasts</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]72
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]73<p class="toc_h3"><a href="#3_8_6_themes">3.8.6. Themes</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]74
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]75<p class="toc_h3"><a href="#3_8_7_live_wallpapers">3.8.7. Live Wallpapers</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]76
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]77<p class="toc_h3"><a href="#3_8_8_activity_switching">3.8.8. Activity Switching</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]78
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]79<p class="toc_h3"><a href="#3_8_9_input_management">3.8.9. Input Management</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]80
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]81<p class="toc_h3"><a href="#3_8_10_lock_screen_media_control">3.8.10. Lock Screen Media Control</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]82
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]83<p class="toc_h3"><a href="#3_8_11_dreams">3.8.11. Dreams</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]84
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]85<p class="toc_h3"><a href="#3_8_12_location">3.8.12. Location</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]86
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]87<p class="toc_h3"><a href="#3_8_13_unicode_and_font">3.8.13. Unicode and Font</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]88
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]89
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]90
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]91</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]92
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]93<div id="toc_right"><br>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]94
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]95
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]96
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]97<p class="toc_h2"><a href="#3_9_device_administration">3.9. Device Administration</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]98
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]99<p class="toc_h2"><a href="#3_10_accessibility">3.10. Accessibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]100
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]101<p class="toc_h2"><a href="#3_11_text-to-speech">3.11. Text-to-Speech</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]102
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]103<p class="toc_h2"><a href="#3_12_tv_input_framework">3.12. TV Input Framework</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]104
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]105<p class="toc_h1"><a href="#4_application_packaging_compatibility">4. Application Packaging Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]106
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]107<p class="toc_h1"><a href="#5_multimedia_compatibility">5. Multimedia Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]108
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]109<p class="toc_h2"><a href="#5_1_media_codecs">5.1. Media Codecs</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]110
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]111<p class="toc_h3"><a href="#5_1_1_audio_codecs">5.1.1. Audio Codecs</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]112
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]113<p class="toc_h3"><a href="#5_1_2_image_codecs">5.1.2. Image Codecs</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]114
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]115<p class="toc_h3"><a href="#5_1_3_video_codecs">5.1.3. Video Codecs</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]116
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]117<p class="toc_h2"><a href="#5_2_video_encoding">5.2. Video Encoding</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]118
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]119<p class="toc_h2"><a href="#5_3_video_decoding">5.3. Video Decoding</a></p>
120
121<p class="toc_h2"><a href="#5_4_audio_recording">5.4. Audio Recording</a></p>
122
123<p class="toc_h3"><a href="#5_4_1_raw_audio_capture">5.4.1. Raw Audio Capture</a></p>
124
125<p class="toc_h3"><a href="#5_4_2_capture_for_voice_recognition">5.4.2. Capture for Voice Recognition</a></p>
126
127<p class="toc_h3"><a href="#5_4_3_capture_for_rerouting_of_playback">5.4.3. Capture for Rerouting of Playback</a></p>
128
129<p class="toc_h2"><a href="#5_5_audio_playback">5.5. Audio Playback</a></p>
130
131<p class="toc_h3"><a href="#5_5_1_raw_audio_playback">5.5.1. Raw Audio Playback</a></p>
132
133<p class="toc_h3"><a href="#5_5_2_audio_effects">5.5.2. Audio Effects</a></p>
134
135<p class="toc_h3"><a href="#5_5_3_audio_output_volume">5.5.3. Audio Output Volume</a></p>
136
137<p class="toc_h2"><a href="#5_6_audio_latency">5.6. Audio Latency</a></p>
138
139<p class="toc_h2"><a href="#5_7_network_protocols">5.7. Network Protocols</a></p>
140
141<p class="toc_h2"><a href="#5_8_secure_media">5.8. Secure Media</a></p>
142
143<p class="toc_h1"><a href="#6_developer_tools_and_options_compatibility">6. Developer Tools and Options Compatibility</a></p>
144
145<p class="toc_h2"><a href="#6_1_developer_tools">6.1. Developer Tools</a></p>
146
147<p class="toc_h2"><a href="#6_2_developer_options">6.2. Developer Options</a></p>
148
149<p class="toc_h1"><a href="#7_hardware_compatibility">7. Hardware Compatibility</a></p>
150
151<p class="toc_h2"><a href="#7_1_display_and_graphics">7.1. Display and Graphics</a></p>
152
153<p class="toc_h3"><a href="#7_1_1_screen_configuration">7.1.1. Screen Configuration</a></p>
154
155<p class="toc_h4"><a href="#7_1_1_1_screen_size">7.1.1.1. Screen Size</a></p>
156
157<p class="toc_h4"><a href="#7_1_1_2_screen_aspect_ratio">7.1.1.2. Screen Aspect Ratio</a></p>
158
159<p class="toc_h4"><a href="#7_1_1_3_screen_density">7.1.1.3. Screen Density</a></p>
160
161
162</div>
163
164<div style="clear: both; page-break-after:always; height:15px"></div>
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Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]166
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]167<div id="toc_left_2">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]168
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]169<p class="toc_h3"><a href="#7_1_2_display_metrics">7.1.2. Display Metrics</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]170
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]171<p class="toc_h3"><a href="#7_1_3_screen_orientation">7.1.3. Screen Orientation</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]172
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]173<p class="toc_h3"><a href="#7_1_4_2d_and_3d_graphics_acceleration">7.1.4. 2D and 3D Graphics Acceleration</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]174
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]175<p class="toc_h3"><a href="#7_1_5_legacy_application_compatibility_mode">7.1.5. Legacy Application Compatibility Mode</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]176
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]177<p class="toc_h3"><a href="#7_1_6_screen_technology">7.1.6. Screen Technology</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]178
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]179<p class="toc_h3"><a href="#7_1_7_external_displays">7.1.7. External Displays</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]180
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]181<p class="toc_h2"><a href="#7_2_input_devices">7.2. Input Devices</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]182
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]183<p class="toc_h3"><a href="#7_2_1_keyboard">7.2.1. Keyboard</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]184
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]185<p class="toc_h3"><a href="#7_2_2_non-touch_navigation">7.2.2. Non-touch Navigation</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]186
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]187<p class="toc_h3"><a href="#7_2_3_navigation_keys">7.2.3. Navigation Keys</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]188
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]189<p class="toc_h3"><a href="#7_2_4_touchscreen_input">7.2.4. Touchscreen Input</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]190
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]191<p class="toc_h3"><a href="#7_2_5_fake_touch_input">7.2.5. Fake Touch Input</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]192
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]193<p class="toc_h3"><a href="#7_2_6_game_controller_support">7.2.6. Game Controller Support</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]194
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]195<p class="toc_h4"><a href="#7_2_6_1_button_mapping">7.2.6.1. Button Mappings</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]196
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]197<p class="toc_h3"><a href="#7_2_7_remote_control">7.2.7. Remote Control</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]198
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]199<p class="toc_h2"><a href="#7_3_sensors">7.3. Sensors</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]200
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]201<p class="toc_h3"><a href="#7_3_1_accelerometer">7.3.1. Accelerometer</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]202
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]203<p class="toc_h3"><a href="#7_3_2_magnetometer">7.3.2. Magnetometer</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]204
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]205<p class="toc_h3"><a href="#7_3_3_gps">7.3.3. GPS</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]206
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]207<p class="toc_h3"><a href="#7_3_4_gyroscope">7.3.4. Gyroscope</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]208
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]209<p class="toc_h3"><a href="#7_3_5_barometer">7.3.5. Barometer</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]210
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]211<p class="toc_h3"><a href="#7_3_6_thermometer">7.3.6. Thermometer</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]212
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]213<p class="toc_h3"><a href="#7_3_7_photometer">7.3.7. Photometer</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]214
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]215<p class="toc_h3"><a href="#7_3_8_proximity_sensor">7.3.8. Proximity Sensor</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]216
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]217<p class="toc_h2"><a href="#7_4_data_connectivity">7.4. Data Connectivity</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]218
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]219<p class="toc_h3"><a href="#7_4_1_telephony">7.4.1. Telephony</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]220
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]221<p class="toc_h3"><a href="#7_4_2_ieee_80211_wi-fi">7.4.2. IEEE 802.11 (Wi-Fi)</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]222
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]223<p class="toc_h4"><a href="#7_4_2_1_wi-fi_direct">7.4.2.1. Wi-Fi Direct</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]224
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]225<p class="toc_h4"><a href="#7_4_2_2_wi-fi-tunneled-direct-link-setup">7.4.2.2. Wi-Fi Tunneled Direct Link Setup</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]226
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]227<p class="toc_h3"><a href="#7_4_3_bluetooth">7.4.3. Bluetooth</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]228
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]229<p class="toc_h3"><a href="#7_4_4_near-field_communications">7.4.4. Near-Field Communications</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]230
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]231<p class="toc_h3"><a href="#7_4_5_minimum_network_capability">7.4.5. Minimum Network Capability</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]232
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]233<p class="toc_h3"><a href="#7_4_6_sync_settings">7.4.6. Sync Settings</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]234
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]235<p class="toc_h2"><a href="#7_5_cameras">7.5. Cameras</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]236
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]237<p class="toc_h3"><a href="#7_5_1_rear-facing_camera">7.5.1. Rear-Facing Camera</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]238
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]239<p class="toc_h3"><a href="#7_5_2_front-facing_camera">7.5.2. Front-Facing Camera</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]240
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]241<p class="toc_h3"><a href="#7_5_3_external_camera">7.5.3. External Camera</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]242
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]243<p class="toc_h3"><a href="#7_5_4_camera_api_behavior">7.5.4. Camera API Behavior</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]244
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]245
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]246
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]247
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]248
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]249</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]250
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]251<div id="toc_right_2">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]252
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]253<p class="toc_h3"><a href="#7_5_5_camera_orientation">7.5.5. Camera Orientation</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]254
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]255<p class="toc_h2"><a href="#7_6_memory_and_storage">7.6. Memory and Storage</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]256
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]257<p class="toc_h3"><a href="#7_6_1_minimum_memory_and_storage">7.6.1. Minimum Memory and Storage</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]258
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]259<p class="toc_h3"><a href="#7_6_2_application_shared_storage">7.6.2. Application Shared Storage</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]260
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]261<p class="toc_h2"><a href="#7_7_usb">7.7. USB</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]262
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]263<p class="toc_h2"><a href="#7_8_audio">7.8. Audio</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]264
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]265<p class="toc_h3"><a href="#7_8_1_microphone">7.8.1. Microphone</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]266
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]267<p class="toc_h3"><a href="#7_8_2_audio_output">7.8.2. Audio Output</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]268
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]269<p class="toc_h4"><a href="#7_8_2_1_analog_audio_ports">7.8.2.1. Analog Audio Ports</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]270
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]271<p class="toc_h1"><a href="#8_performance_compatibility">8. Performance Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]272
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]273<p class="toc_h2"><a href="#8_1_user_experience_consistency">8.1. User Experience Consistency</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]274
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]275<p class="toc_h2"><a href="#8_2_memory_performance">8.2. Memory Performance</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]276
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]277<p class="toc_h1"><a href="#9_security_model_compatibility">9. Security Model Compatibility</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]278
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]279<p class="toc_h2"><a href="#9_1_permissions">9.1. Permissions</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]280
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]281<p class="toc_h2"><a href="#9_2_uid_and_process_isolation">9.2. UID and Process Isolation</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]282
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]283<p class="toc_h2"><a href="#9_3_filesystem_permissions">9.3. Filesystem Permissions</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]284
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]285<p class="toc_h2"><a href="#9_4_alternate_execution_environments">9.4. Alternate Execution Environments</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]286
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]287<p class="toc_h2"><a href="#9_5_multi-user_support">9.5. Multi-User Support</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]288
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]289<p class="toc_h2"><a href="#9_6_premium_sms_warning">9.6. Premium SMS Warning</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]290
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]291<p class="toc_h2"><a href="#9_7_kernel_security_features">9.7. Kernel Security Features</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]292
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]293<p class="toc_h2"><a href="#9_8_privacy">9.8. Privacy</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]294
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]295<p class="toc_h2"><a href="#9_9_full-disk-encryption">9.9. Full-Disk Encryption</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]296
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]297<p class="toc_h2"><a href="#9_10_verified_boot">9.10. Verified Boot</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]298
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]299<p class="toc_h1"><a href="#10_software_compatibility_testing">10. Software Compatibility Testing</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]300
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]301<p class="toc_h2"><a href="#10_1_compatibility_test_suite">10.1. Compatibility Test Suite</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]302
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]303<p class="toc_h2"><a href="#10_2_cts_verifier">10.2. CTS Verifier</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]304
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]305<p class="toc_h1"><a href="#11_updatable_software">11. Updatable Software</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]306
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]307<p class="toc_h1"><a href="#12_document_changelog">12. Document Changelog</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]308
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]309<p class="toc_h1"><a href="#13_contact_us">13. Contact Us</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]310
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]311<p class="toc_h1"><a href="#14_resources">14. Resources</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]312
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]313</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]314
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]315</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]316
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]317<div style="clear: both"></div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]318
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]319<div id="main">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]320
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]321<h1 id="1_introduction">1. Introduction</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]322
323
324<p>This document enumerates the requirements that must be met in order for devices
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]325to be compatible with Android 5.1.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]326
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]327<p>The use of &ldquo;MUST&rdquo;, &ldquo;MUST NOT&rdquo;, &ldquo;REQUIRED&rdquo;, &ldquo;SHALL&rdquo;, &ldquo;SHALL NOT&rdquo;, &ldquo;SHOULD&rdquo;,&ldquo;SHOULD NOT&rdquo;, &ldquo;RECOMMENDED&rdquo;, &ldquo;MAY&rdquo;, and &ldquo;OPTIONAL&rdquo; is per the IETF standard
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]328defined in RFC2119 [<a href="http://www.ietf.org/rfc/rfc2119.txt">Resources, 1</a>].</p>
329
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]330<p>As used in this document, a &ldquo;device implementer&rdquo; or &ldquo;implementer&rdquo; is a person
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]331or organization developing a hardware/software solution running Android 5.1. A
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]332&ldquo;device implementation&rdquo; or &ldquo;implementation is the hardware/software solution
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]333so developed.</p>
334
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]335<p>To be considered compatible with Android 5.1, device implementations MUST meet
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]336the requirements presented in this Compatibility Definition, including any
337documents incorporated via reference.</p>
338
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]339<p>Where this definition or the software tests described in <a href="#10_software_compatibility_testing">section 10</a> is silent, ambiguous, or incomplete, it is the responsibility of the device
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]340implementer to ensure compatibility with existing implementations.</p>
341
342<p>For this reason, the Android Open Source Project [<a href="http://source.android.com/">Resources, 2</a>] is both the reference and preferred implementation of Android. Device
343implementers are strongly encouraged to base their implementations to the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]344greatest extent possible on the &ldquo;upstream&rdquo; source code available from the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]345Android Open Source Project. While some components can hypothetically be
346replaced with alternate implementations this practice is strongly discouraged,
347as passing the software tests will become substantially more difficult. It is
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]348the implementer&rsquo;s responsibility to ensure full behavioral compatibility with
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]349the standard Android implementation, including and beyond the Compatibility
350Test Suite. Finally, note that certain component substitutions and
351modifications are explicitly forbidden by this document.</p>
352
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]353<p>Many of the resources listed in <a href="#14_resources">section 14</a> are derived directly or indirectly from the Android SDK, and will be
354functionally identical to the information in that SDK&rsquo;s documentation. For any
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]355case where this Compatibility Definition or the Compatibility Test Suite
356disagrees with the SDK documentation, the SDK documentation is considered
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]357authoritative. Any technical details provided in the references included in <a href="#14_resources">section 14</a> are considered by inclusion to be part of this Compatibility Definition. </p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]358
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]359<h1 id="2_device_types">2. Device Types</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]360
361
362<p>While the Android Open Source Project has been used in the implementation of a
363variety of device types and form factors, many aspects of the architecture and
364compatibility requirements were optimized for handheld devices. Starting from
365Android 5.0, the Android Open Source Project aims to embrace a wider variety of
366device types as described in this section.</p>
367
368<p><strong>Android Handheld device</strong> refers to an Android device implementation that is typically used by holding
369it in the hand, such as mp3 players, phones, and tablets. Android Handheld
370device implementations:</p>
371
372<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]373 <li>MUST have a touchscreen embedded in the device.</li>
374 <li>MUST have a power source that provides mobility, such as a battery.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]375</ul>
376
377<p><strong>Android Television device</strong> refers to an Android device implementation that is an entertainment interface
378for consuming digital media, movies, games, apps, and/or live TV for users
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]379sitting about ten feet away (a &ldquo;lean back&rdquo; or &ldquo;10-foot user interface&rdquo;).
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]380Android Television devices:</p>
381
382<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]383 <li>MUST have an embedded screen OR include a video output port, such as VGA, HDMI,
384or a wireless port for display.</li>
385 <li>MUST declare the features android.software.leanback and
386android.hardware.type.television [<a href="http://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_LEANBACK">Resources, 3</a>].</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]387</ul>
388
389<p><strong>Android Watch device</strong> refers to an Android device implementation intended to be worn on the body,
390perhaps on the wrist, and:</p>
391
392<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]393 <li>MUST have a screen with the physical diagonal length in the range from 1.1 to
3942.5 inches.</li>
395 <li>MUST declare the feature android.hardware.type.watch.</li>
396 <li>MUST support uiMode = UI_MODE_TYPE_WATCH [<a href="http://developer.android.com/reference/android/content/res/Configuration.html#UI_MODE_TYPE_WATCH">Resources, 4</a>].</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]397</ul>
398
Heidi von Markham61607242015-04-02 12:59:09 -0700[diff] [blame]399<p><strong>Android Automotive implementation</strong> refers to a vehicle head
400unit running Android as an operating system for part or all of the system and/or
401infotainment functionality. Android Automotive implementations MUST support
402uiMode = UI_MODE_TYPE_CAR [<a href="http://developer.android.com/reference/android/content/res/Configuration.html#UI_MODE_TYPE_CAR">Resources, 111</a>].</p>
403
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]404<p>All Android device implementations that do not fit into any of the above device
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]405types still MUST meet all requirements in this document to be Android 5.1
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]406compatible, unless the requirement is explicitly described to be only
407applicable to a specific Android device type. </p>
408
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]409<h2 id="2_1_device_configurations">2.1 Device Configurations</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]410
411
412<p>This is a summary of major differences in hardware configuration by device
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]413type. (Empty cells denote a &ldquo;MAY&rdquo;). Not all configurations are covered in this
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]414table; see relevant hardware sections for more detail.</p>
415<table>
416 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]417 <th>Category</th>
418 <th>Feature</th>
419 <th>Section</th>
420 <th>Handheld</th>
421 <th>Television</th>
422 <th>Watch</th>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]423 <th>Automotive</th>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]424 <th>Other</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]425 </tr>
426 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]427 <td rowspan="3">Input</td>
428 <td>D-pad</td>
429 <td><a href="#7_2_2_non-touch-navigation">7.2.2. Non-touch Navigation</a></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]430 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]431 <td>MUST</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]432 <td></td>
433 <td></td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]434 <td></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]435 </tr>
436 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]437 <td>Touchscreen </td>
438 <td><a href="#7_2_4_touchscreen_input">7.2.4. Touchscreen input</a></td>
439 <td>MUST</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]440 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]441 <td>MUST</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]442 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]443 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]444 </tr>
445 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]446 <td>Microphone </td>
447 <td><a href="#7_8_1_microphone">7.8.1. Microphone</a></td>
448 <td>MUST</td>
449 <td>SHOULD </td>
450 <td>MUST</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]451 <td>MUST</td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]452 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]453 </tr>
454 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]455 <td rowspan="2">Sensors</td>
456 <td>Accelerometer </td>
457 <td><a href="#7_3_1_accelerometer">7.3.1 Accelerometer</a></td>
458 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]459 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]460 <td>SHOULD</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]461 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]462 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]463 </tr>
464 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]465 <td>GPS</td>
466 <td><a href="#7_3_3_gps">7.3.3. GPS</a></td>
467 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]468 <td></td>
469 <td></td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]470 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]471 <td></td>
472 </tr>
473 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]474 <td rowspan="5">Connectivity</td>
475 <td>Wi-Fi</td>
476 <td><a href="#7_4_2_ieee_802.11">7.4.2. IEEE 802.11</a></td>
477 <td>SHOULD</td>
478 <td> MUST</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]479 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]480 <td>SHOULD</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]481 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]482 </tr>
483 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]484 <td>Wi-Fi Direct</td>
485 <td><a href="#7_4_2_1_wi-fi-direct">7.4.2.1. Wi-Fi Direct</a></td>
486 <td>SHOULD</td>
487 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]488 <td></td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]489 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]490 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]491 </tr>
492 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]493 <td>Bluetooth</td>
494 <td><a href="#7_4_3_bluetooth">7.4.3. Bluetooth</a></td>
495 <td>SHOULD</td>
496 <td>MUST</td>
497 <td>MUST</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]498 <td>MUST</td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]499 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]500 </tr>
501 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]502 <td>Bluetooth Low Energy</td>
503 <td><a href="#7_4_3_bluetooth">7.4.3. Bluetooth</a></td>
504 <td>SHOULD</td>
505 <td>MUST</td>
506 <td>SHOULD</td>
507 <td>SHOULD</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]508 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]509 </tr>
510 <tr>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]511 <td>USB peripheral/host mode</td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]512 <td><a href="#7_7_usb">7.7. USB</a></td>
513 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]514 <td></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]515 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]516 <td>SHOULD</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]517 <td>SHOULD</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]518 </tr>
519 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]520 <td>Output</td>
521 <td>Speaker and/or Audio output ports</td>
522 <td><a href="#7_8_2_audio_output">7.8.2. Audio Output</a></td>
523 <td>MUST</td>
524 <td>MUST</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]525 <td></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]526 <td>MUST</td>
Heidi von Markhamb183b322015-05-26 15:17:37 -0700[diff] [blame^]527 <td>MUST</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]528 </tr>
529</table>
530
531
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]532<h1 id="3_software">3. Software</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]533
534
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]535<h2 id="3_1_managed_api_compatibility">3.1. Managed API Compatibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]536
537
538<p>The managed Dalvik bytecode execution environment is the primary vehicle for
539Android applications. The Android application programming interface (API) is
540the set of Android platform interfaces exposed to applications running in the
541managed runtime environment. Device implementations MUST provide complete
542implementations, including all documented behaviors, of any documented API
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]543exposed by the Android SDK [<a href="http://developer.android.com/reference/packages.html">Resources, 5</a>] or any API decorated with the &ldquo;@SystemApi&rdquo; marker in the upstream Android
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]544source code. </p>
545
546<p>Device implementations MUST NOT omit any managed APIs, alter API interfaces or
547signatures, deviate from the documented behavior, or include no-ops, except
548where specifically allowed by this Compatibility Definition.</p>
549
550<p>This Compatibility Definition permits some types of hardware for which Android
551includes APIs to be omitted by device implementations. In such cases, the APIs
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]552MUST still be present and behave in a reasonable way. See <a href="#7_hardware_compatibility">section 7</a> for specific requirements for this scenario.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]553
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]554<h2 id="3_2_soft_api_compatibility">3.2. Soft API Compatibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]555
556
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]557<p>In addition to the managed APIs from <a href="#3_1_managed_api_compatibility">section 3.1</a>, Android also includes a significant runtime-only &ldquo;soft&rdquo; API, in the form of
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]558such things as intents, permissions, and similar aspects of Android
559applications that cannot be enforced at application compile time.</p>
560
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]561<h3 id="3_2_1_permissions">3.2.1. Permissions</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]562
563
564<p>Device implementers MUST support and enforce all permission constants as
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]565documented by the Permission reference page [<a href="http://developer.android.com/reference/android/Manifest.permission.html">Resources, 6]</a>. Note that <a href="#9_security_model_compatibility">section 9</a> lists additional requirements related to the Android security model.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]566
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]567<h3 id="3_2_2_build_parameters">3.2.2. Build Parameters</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]568
569
570<p>The Android APIs include a number of constants on the android.os.Build class [<a href="http://developer.android.com/reference/android/os/Build.html">Resources, 7</a>] that are intended to describe the current device. To provide consistent,
571meaningful values across device implementations, the table below includes
572additional restrictions on the formats of these values to which device
573implementations MUST conform.</p>
574<table>
575 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]576 <th>Parameter</th>
577 <th>Details</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]578 </tr>
579 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]580 <td>VERSION.RELEASE</td>
581 <td>The version of the currently-executing Android system, in human-readable
582format. This field MUST have one of the string values defined in [<a href="http://source.android.com/compatibility/5.1/versions.html">Resources, 8]</a>.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]583 </tr>
584 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]585 <td>VERSION.SDK</td>
586 <td>The version of the currently-executing Android system, in a format accessible
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]587to third-party application code. For Android 5.1, this field MUST have the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]588integer value 22.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]589 </tr>
590 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]591 <td>VERSION.SDK_INT</td>
592 <td>The version of the currently-executing Android system, in a format accessible
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]593to third-party application code. For Android 5.1, this field MUST have the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]594integer value 22.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]595 </tr>
596 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]597 <td>VERSION.INCREMENTAL</td>
598 <td>A value chosen by the device implementer designating the specific build of the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]599currently-executing Android system, in human-readable format. This value MUST
600NOT be reused for different builds made available to end users. A typical use
601of this field is to indicate which build number or source-control change
602identifier was used to generate the build. There are no requirements on the
603specific format of this field, except that it MUST NOT be null or the empty
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]604string ("").</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]605 </tr>
606 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]607 <td>BOARD</td>
608 <td>A value chosen by the device implementer identifying the specific internal
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]609hardware used by the device, in human-readable format. A possible use of this
610field is to indicate the specific revision of the board powering the device.
611The value of this field MUST be encodable as 7-bit ASCII and match the regular
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]612expression &ldquo;^[a-zA-Z0-9_-]+$&rdquo;.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]613 </tr>
614 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]615 <td>BRAND</td>
616 <td>A value reflecting the brand name associated with the device as known to the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]617end users. MUST be in human-readable format and SHOULD represent the
618manufacturer of the device or the company brand under which the device is
619marketed. The value of this field MUST be encodable as 7-bit ASCII and match
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]620the regular expression &ldquo;^[a-zA-Z0-9_-]+$&rdquo;.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]621 </tr>
622 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]623 <td>SUPPORTED_ABIS</td>
624 <td>The name of the instruction set (CPU type + ABI convention) of native code. See <a href="#3_3_native_api_compatibility">section 3.3. Native API Compatibility</a>.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]625 </tr>
626 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]627 <td>SUPPORTED_32_BIT_ABIS</td>
628 <td>The name of the instruction set (CPU type + ABI convention) of native code. See <a href="#3_3_native_api_compatibility">section 3.3. Native API Compatibility</a>.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]629 </tr>
630 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]631 <td>SUPPORTED_64_BIT_ABIS</td>
632 <td>The name of the second instruction set (CPU type + ABI convention) of native
633code. See <a href="#3_3_native_api_compatibility">section 3.3. Native API Compatibility</a>.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]634 </tr>
635 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]636 <td>CPU_ABI</td>
637 <td>The name of the instruction set (CPU type + ABI convention) of native code. See <a href="#3_3_native_api_compatibility">section 3.3. Native API Compatibility</a>.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]638 </tr>
639 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]640 <td>CPU_ABI2</td>
641 <td>The name of the second instruction set (CPU type + ABI convention) of native
642code. See <a href="#3_3_native_api_compatibility">section 3.3. Native API Compatibility</a>.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]643 </tr>
644 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]645 <td>DEVICE</td>
646 <td>A value chosen by the device implementer containing the development name or
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]647code name identifying the configuration of the hardware features and industrial
648design of the device. The value of this field MUST be encodable as 7-bit ASCII
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]649and match the regular expression &ldquo;^[a-zA-Z0-9_-]+$&rdquo;.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]650 </tr>
651 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]652 <td>FINGERPRINT</td>
653 <td>A string that uniquely identifies this build. It SHOULD be reasonably
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]654human-readable. It MUST follow this template:</p>
655
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]656<p class="small">$(BRAND)/$(PRODUCT)/$(DEVICE):$(VERSION.RELEASE)/$(ID)/$(VERSION.INCREMENTAL):$(TYPE)/$(TAGS)</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]657
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]658<p>For example: acme/myproduct/mydevice:5.1/LMYXX/3359:userdebug/test-keys</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]659
660<p>The fingerprint MUST NOT include whitespace characters. If other fields
661included in the template above have whitespace characters, they MUST be
662replaced in the build fingerprint with another character, such as the
663underscore ("_") character. The value of this field MUST be encodable as 7-bit
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]664ASCII.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]665 </tr>
666 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]667 <td>HARDWARE</td>
668 <td>The name of the hardware (from the kernel command line or /proc). It SHOULD be
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]669reasonably human-readable. The value of this field MUST be encodable as 7-bit
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]670ASCII and match the regular expression &ldquo;^[a-zA-Z0-9_-]+$&rdquo;. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]671 </tr>
672 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]673 <td>HOST</td>
674 <td>A string that uniquely identifies the host the build was built on, in
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]675human-readable format. There are no requirements on the specific format of this
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]676field, except that it MUST NOT be null or the empty string ("").</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]677 </tr>
678 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]679 <td>ID</td>
680 <td>An identifier chosen by the device implementer to refer to a specific release,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]681in human-readable format. This field can be the same as
682android.os.Build.VERSION.INCREMENTAL, but SHOULD be a value sufficiently
683meaningful for end users to distinguish between software builds. The value of
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]684this field MUST be encodable as 7-bit ASCII and match the regular expression &ldquo;^[a-zA-Z0-9._-]+$&rdquo;.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]685 </tr>
686 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]687 <td>MANUFACTURER</td>
688 <td>The trade name of the Original Equipment Manufacturer (OEM) of the product.
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]689There are no requirements on the specific format of this field, except that it
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]690MUST NOT be null or the empty string ("").</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]691 </tr>
692 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]693 <td>MODEL</td>
694 <td>A value chosen by the device implementer containing the name of the device as
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]695known to the end user. This SHOULD be the same name under which the device is
696marketed and sold to end users. There are no requirements on the specific
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]697format of this field, except that it MUST NOT be null or the empty string ("").</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]698 </tr>
699 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]700 <td>PRODUCT</td>
701 <td>A value chosen by the device implementer containing the development name or
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]702code name of the specific product (SKU) that MUST be unique within the same
703brand. MUST be human-readable, but is not necessarily intended for view by end
704users. The value of this field MUST be encodable as 7-bit ASCII and match the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]705regular expression &ldquo;^[a-zA-Z0-9_-]+$&rdquo;.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]706 </tr>
707 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]708 <td>SERIAL</td>
709 <td>A hardware serial number, which MUST be available. The value of this field MUST
710be encodable as 7-bit ASCII and match the regular expression &ldquo;^([a-zA-Z0-9]{6,20})$&rdquo;.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]711 </tr>
712 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]713 <td>TAGS</td>
714 <td>A comma-separated list of tags chosen by the device implementer that further
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]715distinguishes the build. This field MUST have one of the values corresponding
716to the three typical Android platform signing configurations: release-keys,
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]717dev-keys, test-keys. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]718 </tr>
719 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]720 <td>TIME</td>
721 <td>A value representing the timestamp of when the build occurred.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]722 </tr>
723 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]724 <td>TYPE</td>
725 <td>A value chosen by the device implementer specifying the runtime configuration
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]726of the build. This field MUST have one of the values corresponding to the three
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]727typical Android runtime configurations: user, userdebug, or eng.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]728 </tr>
729 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]730 <td>USER</td>
731 <td>A name or user ID of the user (or automated user) that generated the build.
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]732There are no requirements on the specific format of this field, except that it
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]733MUST NOT be null or the empty string ("").</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]734 </tr>
735</table>
736
737
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]738<h3 id="3_2_3_intent_compatibility">3.2.3. Intent Compatibility</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]739
740
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]741<p>Device implementations MUST honor Android&rsquo;s loose-coupling intent system, as
742described in the sections below. By&ldquo;honored &rdquo; it is meant that the device
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]743implementer MUST provide an Android Activity or Service that specifies a
744matching intent filter that binds to and implements correct behavior for each
745specified intent pattern.</p>
746
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]747<h4 id="3_2_3_1_core_application_intents">3.2.3.1. Core Application Intents</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]748
749
750<p>Android intents allow application components to request functionality from
751other Android components. The Android upstream project includes a list of
752applications considered core Android applications, which implements several
753intent patterns to perform common actions. The core Android applications are:</p>
754
755<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]756 <li>Desk Clock</li>
757 <li>Browser</li>
758 <li>Calendar</li>
759 <li>Contacts</li>
760 <li>Gallery</li>
761 <li>GlobalSearch</li>
762 <li>Launcher</li>
763 <li>Music</li>
764 <li>Settings</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]765</ul>
766
767<p>Device implementations SHOULD include the core Android applications as
768appropriate but MUST include a component implementing the same intent patterns
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]769defined by all the &ldquo;public&rdquo; Activity or Service components of these core
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]770Android applications. Note that Activity or Service components are considered
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]771&ldquo;public&rdquo; when the attribute android:exported is absent or has the value true.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]772
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]773<h4 id="3_2_3_2_intent_overrides">3.2.3.2. Intent Overrides</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]774
775
776<p>As Android is an extensible platform, device implementations MUST allow each
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]777intent pattern referenced in <a href="#3_2_3_1_core_application_intents">section 3.2.3.1</a> to be overridden by third-party applications. The upstream Android open source
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]778implementation allows this by default; device implementers MUST NOT attach
779special privileges to system applications' use of these intent patterns, or
780prevent third-party applications from binding to and assuming control of these
781patterns. This prohibition specifically includes but is not limited to
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]782disabling the&ldquo;Chooser&rdquo; user interface that allows the user to select between
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]783multiple applications that all handle the same intent pattern.</p>
784
785<p>However, device implementations MAY provide default activities for specific URI
786patterns (eg. http://play.google.com) if the default activity provides a more
787specific filter for the data URI. For example, an intent filter specifying the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]788data URI &ldquo;http://www.android.com&rdquo; is more specific than the browser filter for&ldquo;http://&rdquo;. Device implementations MUST provide a user interface for users to
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]789modify the default activity for intents.</p>
790
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]791<h4 id="3_2_3_3_intent_namespaces">3.2.3.3. Intent Namespaces</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]792
793
794<p>Device implementations MUST NOT include any Android component that honors any
795new intent or broadcast intent patterns using an ACTION, CATEGORY, or other key
796string in the android.* or com.android.* namespace. Device implementers MUST
797NOT include any Android components that honor any new intent or broadcast
798intent patterns using an ACTION, CATEGORY, or other key string in a package
799space belonging to another organization. Device implementers MUST NOT alter or
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]800extend any of the intent patterns used by the core apps listed in <a href="#3_2_3_1_core_application_intents">section 3.2.3.1</a>. Device implementations MAY include intent patterns using namespaces clearly
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]801and obviously associated with their own organization. This prohibition is
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]802analogous to that specified for Java language classes in <a href="#3_6_api_namespaces">section 3.6</a>.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]803
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]804<h4 id="3_2_3_4_broadcast_intents">3.2.3.4. Broadcast Intents</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]805
806
807<p>Third-party applications rely on the platform to broadcast certain intents to
808notify them of changes in the hardware or software environment.
809Android-compatible devices MUST broadcast the public broadcast intents in
810response to appropriate system events. Broadcast intents are described in the
811SDK documentation.</p>
812
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]813<h4 id="3_2_3_5_default_app_settings">3.2.3.5. Default App Settings</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]814
815
816<p>Android includes settings that provide users an easy way to select their
817default applications, for example for Home screen or SMS. Where it makes sense,
818device implementations MUST provide a similar settings menu and be compatible
819with the intent filter pattern and API methods described in the SDK
820documentation as below.</p>
821
822<p>Device implementations:</p>
823
824<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]825 <li>MUST honor the android.settings.HOME_SETTINGS intent to show a default app
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]826settings menu for Home Screen, if the device implementation reports
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]827android.software.home_screen [<a href="http://developer.android.com/reference/android/provider/Settings.html">Resources, 10]</a></li>
828 <li>MUST provide a settings menu that will call the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]829android.provider.Telephony.ACTION_CHANGE_DEFAULT intent to show a dialog to
830change the default SMS application, if the device implementation reports
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]831android.hardware.telephony [<a href="http://developer.android.com/reference/android/provider/Telephony.Sms.Intents.html">Resources, 9</a>]</li>
832 <li>MUST honor the android.settings.NFC_PAYMENT_SETTINGS intent to show a default
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]833app settings menu for Tap and Pay, if the device implementation reports
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]834android.hardware.nfc.hce [<a href="http://developer.android.com/reference/android/provider/Settings.html">Resources, 10]</a></li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]835</ul>
836
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]837<h2 id="3_3_native_api_compatibility">3.3. Native API Compatibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]838
839
Unsuk Junga16d5c72015-06-05 02:10:14 -0700[diff] [blame]840<h3 id="3_3_1_application_binary_interfaces">3.3.1. Application Binary Interfaces</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]841
842
843<p>Managed Dalvik bytecode can call into native code provided in the application
844.apk file as an ELF .so file compiled for the appropriate device hardware
845architecture. As native code is highly dependent on the underlying processor
846technology, Android defines a number of Application Binary Interfaces (ABIs) in
847the Android NDK. Device implementations MUST be compatible with one or more
848defined ABIs, and MUST implement compatibility with the Android NDK, as below.</p>
849
850<p>If a device implementation includes support for an Android ABI, it:</p>
851
852<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]853 <li>MUST include support for code running in the managed environment to call into
854native code, using the standard Java Native Interface (JNI) semantics</li>
855 <li>MUST be source-compatible (i.e. header compatible) and binary-compatible (for
856the ABI) with each required library in the list below</li>
857 <li>MUST support the equivalent 32-bit ABI if any 64-bit ABI is supported</li>
858 <li>MUST accurately report the native Application Binary Interface (ABI) supported
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]859by the device, via the android.os.Build.SUPPORTED_ABIS,
860android.os.Build.SUPPORTED_32_BIT_ABIS, and
861android.os.Build.SUPPORTED_64_BIT_ABIS parameters, each a comma separated list
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]862of ABIs ordered from the most to the least preferred one</li>
863 <li>MUST report, via the above parameters, only those ABIs documented in the latest
864version of the Android NDK, &ldquo;NDK Programmer&rsquo;s Guide | ABI Management&rdquo; in docs/
865directory</li>
866 <li>SHOULD be built using the source code and header files available in the
867upstream Android Open Source Project</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]868</ul>
869
870<p>The following native code APIs MUST be available to apps that include native
871code:</p>
872
873<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]874 <li>libc (C library)</li>
875 <li>libm (math library)</li>
876 <li>Minimal support for C++</li>
877 <li>JNI interface</li>
878 <li>liblog (Android logging)</li>
879 <li>libz (Zlib compression)</li>
880 <li>libdl (dynamic linker)</li>
881 <li>libGLESv1_CM.so (OpenGL ES 1.x)</li>
882 <li>libGLESv2.so (OpenGL ES 2.0)</li>
883 <li>libGLESv3.so (OpenGL ES 3.x)</li>
884 <li>libEGL.so (native OpenGL surface management)</li>
885 <li>libjnigraphics.so</li>
886 <li>libOpenSLES.so (OpenSL ES 1.0.1 audio support)</li>
887 <li>libOpenMAXAL.so (OpenMAX AL 1.0.1 support)</li>
888 <li>libandroid.so (native Android activity support)</li>
889 <li>libmediandk.so (native media APIs support)</li>
890 <li>Support for OpenGL, as described below</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]891</ul>
892
893<p>Note that future releases of the Android NDK may introduce support for
894additional ABIs. If a device implementation is not compatible with an existing
895predefined ABI, it MUST NOT report support for any ABIs at all.</p>
896
897<p>Note that device implementations MUST include libGLESv3.so and it MUST symlink
898(symbolic link) to libGLESv2.so. in turn, MUST export all the OpenGL ES 3.1 and
899Android Extension Pack [<a href="http://developer.android.com/guide/topics/graphics/opengl.html#aep">Resources, 11</a>] function symbols as defined in the NDK release android-21. Although all the
900symbols must be present, only the corresponding functions for OpenGL ES
901versions and extensions actually supported by the device must be fully
902implemented.</p>
903
904<p>Native code compatibility is challenging. For this reason, device implementers
905are <strong>very strongly encouraged</strong> to use the implementations of the libraries listed above from the upstream
906Android Open Source Project. </p>
907
Unsuk Junga16d5c72015-06-05 02:10:14 -0700[diff] [blame]908<h3 id="3_3_2_32-bit_arm_native_code_compatibility">
9093.3.2. 32-bit ARM Native Code Compatibility
910</h3>
911
912<p>The ARMv8 architecture deprecates several CPU operations, including some
913operations used in existing native code. On 64-bit ARM devices, the following
914deprecated operations MUST remain available to 32-bit native ARM code, either
915through native CPU support or through software emulation:</p>
916
917<ul>
918<li>SWP and SWPB instructions</li>
919<li>SETEND instruction</li>
920<li>CP15ISB, CP15DSB, and CP15DMB barrier operations</li>
921</ul>
922
923<p>Legacy versions of the Android NDK used /proc/cpuinfo to discover CPU features
924from 32-bit ARM native code. For compatibility with applications built using this
925NDK, devices MUST include the following lines in /proc/cpuinfo when it is read
926by 32-bit ARM applications:</p>
927
928<ul>
929<li>&quot;Features: &quot;, followed by a list of any optional ARMv7 CPU features
930supported by the device</li>
931<li>&quot;CPU architecture: &quot;, followed by an integer describing the device's
932highest supported ARM architecture (e.g., &quot;8&quot; for ARMv8 devices)</li>
933</ul>
934
935<p>These requirements only apply when /proc/cpuinfo is read by 32-bit ARM
936applications. Devices SHOULD not alter /proc/cpuinfo when read by 64-bit ARM or
937non-ARM applications.</p>
938
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]939<h2 id="3_4_web_compatibility">3.4. Web Compatibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]940
941
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]942<h3 id="3_4_1_webview_compatibility">3.4.1. WebView Compatibility</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]943
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]944<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]945<p>The complete implementation of the android.webkit.Webview API MAY be provided
946on Android Watch devices but MUST be provided on all other types of device
947implementations.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]948</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]949
950
951<p>The platform feature android.software.webview MUST be reported on any device
952that provides a complete implementation of the android.webkit.WebView API, and
953MUST NOT be reported on devices without a complete implementation of the API.
954The Android Open Source implementation uses code from the Chromium Project to
955implement the android.webkit.WebView [<a href="http://developer.android.com/reference/android/webkit/WebView.html">Resources, 12</a>]. Because it is not feasible to develop a comprehensive test suite for a web
956rendering system, device implementers MUST use the specific upstream build of
957Chromium in the WebView implementation. Specifically:</p>
958
959<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]960 <li>Device android.webkit.WebView implementations MUST be based on the Chromium
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]961build from the upstream Android Open Source Project for Android 5.1. This build
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]962includes a specific set of functionality and security fixes for the WebView [<a href="http://www.chromium.org/">Resources, 13</a>].</li>
963 <li>The user agent string reported by the WebView MUST be in this format:
Unsuk Jungff3da6d2015-05-18 09:35:24 -0700[diff] [blame]964<p>Mozilla/5.1 (Linux; Android $(VERSION); $(MODEL) Build/$(BUILD)$(WEBVIEW))
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]965AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 $(CHROMIUM_VER) Mobile
966Safari/537.36</p>
967 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]968 <li>The value of the $(VERSION) string MUST be the same as the value for
969android.os.Build.VERSION.RELEASE.</li>
Unsuk Jungff3da6d2015-05-18 09:35:24 -0700[diff] [blame]970 <li>The $(WEBVIEW) string MAY be omitted, but if included MUST be "; wv" to
971 note that this is a webview</li>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]972 <li>The value of the $(MODEL) string MUST be the same as the value for
973android.os.Build.MODEL.</li>
974 <li>The value of the $(BUILD) string MUST be the same as the value for
975android.os.Build.ID.</li>
976 <li>The value of the $(CHROMIUM_VER) string MUST be the version of Chromium in the
977upstream Android Open Source Project.</li>
978 <li>Device implementations MAY omit Mobile in the user agent string.</li>
979 </ul></li></ul>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]980
981<p>The WebView component SHOULD include support for as many HTML5 features as
982possible and if it supports the feature SHOULD conform to the HTML5
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]983specification [<a href="http://html.spec.whatwg.org/multipage/">Resources, 14</a>].</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]984
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]985<h3 id="3_4_2_browser_compatibility">3.4.2. Browser Compatibility</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]986
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]987<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]988<p>Android Television and Watch Devices MAY omit a browser application, but MUST
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]989support the public intent patterns as described in <a href="#3_2_3_1_core_application_intents">section 3.2.3.1</a>. All other types of device implementations MUST include a standalone Browser
990application for general user web browsing.</p>
991</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]992
993<p>The standalone Browser MAY be based on a browser technology other than WebKit.
994However, even if an alternate Browser application is used, the
995android.webkit.WebView component provided to third-party applications MUST be
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]996based on WebKit, as described in <a href="#3_4_1_webview_compatibility">section 3.4.1</a>.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]997
998<p>Implementations MAY ship a custom user agent string in the standalone Browser
999application.</p>
1000
1001<p>The standalone Browser application (whether based on the upstream WebKit
1002Browser application or a third-party replacement) SHOULD include support for as
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1003much of HTML5 [<a href="http://html.spec.whatwg.org/multipage/">Resources, 14</a>] as possible. Minimally, device implementations MUST support each of these
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1004APIs associated with HTML5:</p>
1005
1006<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1007 <li>application cache/offline operation [<a href="http://www.w3.org/html/wg/drafts/html/master/browsers.html#offline">Resources, 15</a>]</li>
1008 <li>the &#60;video&#62; tag [<a href="http://www.w3.org/html/wg/drafts/html/master/semantics.html#video">Resources, 16</a>]</li>
1009 <li>geolocation [<a href="http://www.w3.org/TR/geolocation-API/">Resources, 17</a>]</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1010</ul>
1011
1012<p>Additionally, device implementations MUST support the HTML5/W3C webstorage API
1013[<a href="http://www.w3.org/TR/webstorage/">Resources, 18</a>], and SHOULD support the HTML5/W3C IndexedDB API [<a href="http://www.w3.org/TR/IndexedDB/">Resources, 19</a>]. Note that as the web development standards bodies are transitioning to favor
1014IndexedDB over webstorage, IndexedDB is expected to become a required component
1015in a future version of Android.</p>
1016
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1017<h2 id="3_5_api_behavioral_compatibility">3.5. API Behavioral Compatibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1018
1019
1020<p>The behaviors of each of the API types (managed, soft, native, and web) must be
1021consistent with the preferred implementation of the upstream Android Open
1022Source Project [<a href="http://source.android.com/">Resources, 2</a>]. Some specific areas of compatibility are:</p>
1023
1024<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1025 <li>Devices MUST NOT change the behavior or semantics of a standard intent.</li>
1026 <li>Devices MUST NOT alter the lifecycle or lifecycle semantics of a particular
1027type of system component (such as Service, Activity, ContentProvider, etc.).</li>
1028 <li>Devices MUST NOT change the semantics of a standard permission.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1029</ul>
1030
1031<p>The above list is not comprehensive. The Compatibility Test Suite (CTS) tests
1032significant portions of the platform for behavioral compatibility, but not all.
1033It is the responsibility of the implementer to ensure behavioral compatibility
1034with the Android Open Source Project. For this reason, device implementers
1035SHOULD use the source code available via the Android Open Source Project where
1036possible, rather than re-implement significant parts of the system.</p>
1037
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1038<h2 id="3_6_api_namespaces">3.6. API Namespaces</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1039
1040
1041<p>Android follows the package and class namespace conventions defined by the Java
1042programming language. To ensure compatibility with third-party applications,
1043device implementers MUST NOT make any prohibited modifications (see below) to
1044these package namespaces:</p>
1045
1046<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1047 <li>java.*</li>
1048 <li>javax.*</li>
1049 <li>sun.*</li>
1050 <li>android.*</li>
1051 <li>com.android.*</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1052</ul>
1053
1054<p><strong>Prohibited modifications include</strong>:</p>
1055
1056<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1057 <li>Device implementations MUST NOT modify the publicly exposed APIs on the Android
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1058platform by changing any method or class signatures, or by removing classes or
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1059class fields.</li>
1060 <li>Device implementers MAY modify the underlying implementation of the APIs, but
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1061such modifications MUST NOT impact the stated behavior and Java-language
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1062signature of any publicly exposed APIs.</li>
1063 <li>Device implementers MUST NOT add any publicly exposed elements (such as classes
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1064or interfaces, or fields or methods to existing classes or interfaces) to the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1065APIs above.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1066</ul>
1067
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1068<p>A &ldquo;publicly exposed element&rdquo; is any construct which is not decorated with the&ldquo;@hide&rdquo; marker as used in the upstream Android source code. In other words,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1069device implementers MUST NOT expose new APIs or alter existing APIs in the
1070namespaces noted above. Device implementers MAY make internal-only
1071modifications, but those modifications MUST NOT be advertised or otherwise
1072exposed to developers.</p>
1073
1074<p>Device implementers MAY add custom APIs, but any such APIs MUST NOT be in a
1075namespace owned by or referring to another organization. For instance, device
1076implementers MUST NOT add APIs to the com.google.* or similar namespace: only
1077Google may do so. Similarly, Google MUST NOT add APIs to other companies'
1078namespaces. Additionally, if a device implementation includes custom APIs
1079outside the standard Android namespace, those APIs MUST be packaged in an
1080Android shared library so that only apps that explicitly use them (via the
1081<uses-library> mechanism) are affected by the increased memory usage of such
1082APIs.</p>
1083
1084<p>If a device implementer proposes to improve one of the package namespaces above
1085(such as by adding useful new functionality to an existing API, or adding a new
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1086API), the implementer SHOULD visit <a href="http://source.android.com/">source.android.com</a> and begin the process for contributing changes and code, according to the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1087information on that site.</p>
1088
1089<p>Note that the restrictions above correspond to standard conventions for naming
1090APIs in the Java programming language; this section simply aims to reinforce
1091those conventions and make them binding through inclusion in this Compatibility
1092Definition.</p>
1093
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1094<h2 id="3_7_runtime_compatibility">3.7. Runtime Compatibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1095
1096
1097<p>Device implementations MUST support the full Dalvik Executable (DEX) format and
1098Dalvik bytecode specification and semantics [<a href="https://android.googlesource.com/platform/dalvik/+/lollipop-release/docs/">Resources, 20</a>]. Device implementers SHOULD use ART, the reference upstream implementation of
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1099the Dalvik Executable Format, and the reference implementation&rsquo;s package
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1100management system.</p>
1101
1102<p>Device implementations MUST configure Dalvik runtimes to allocate memory in
1103accordance with the upstream Android platform, and as specified by the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1104following table. (See <a href="#7_1_1_screen_configuration">section 7.1.1</a> for screen size and screen density definitions.)</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1105
1106<p>Note that memory values specified below are considered minimum values and
1107device implementations MAY allocate more memory per application.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1108
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1109<table>
1110 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1111 <th>Screen Layout</th>
1112 <th>Screen Density</th>
1113 <th>Minimum Application Memory</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1114 </tr>
1115 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1116 <td rowspan="10">small/normal</td>
1117 <td>120 dpi (ldpi)</td>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1118 <td rowspan="2">32MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1119 </tr>
1120 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1121 <td>160 dpi (mdpi)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1122 </tr>
1123 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1124 <td>213 dpi (tvdpi)</td>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1125 <td rowspan="3">48MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1126 </tr>
1127 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1128 <td>240 dpi (hdpi)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1129 </tr>
1130 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1131 <td>280 dpi (280dpi)</td>
Unsuk Jungaa55a672015-04-01 08:30:23 -0700[diff] [blame]1132 </tr>
1133 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1134 <td>320 dpi (xhdpi)</td>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1135 <td>80MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1136 </tr>
1137 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1138 <td>400 dpi (400dpi)</td>
1139 <td>96MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1140 </tr>
1141 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1142 <td>480 dpi (xxhdpi)</td>
1143 <td>128MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1144 </tr>
1145 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1146 <td>560 dpi (560dpi)</td>
1147 <td>192MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1148 </tr>
1149 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1150 <td>640 dpi (xxxhdpi)</td>
1151 <td>256MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1152 </tr>
1153 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1154 <td rowspan="10">large</td>
1155 <td>120 dpi (ldpi)</td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1156 <td>32MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1157 </tr>
1158 <tr>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1159 <td>160 dpi (mdpi)</td>
1160 <td>48MB</td>
1161 </tr>
1162 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1163 <td>213 dpi (tvdpi)</td>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1164 <td rowspan="2">80MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1165 </tr>
1166 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1167 <td>240 dpi (hdpi)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1168 </tr>
1169 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1170 <td>280 dpi (280dpi)</td>
1171 <td>96MB</td>
Unsuk Jungaa55a672015-04-01 08:30:23 -0700[diff] [blame]1172 </tr>
1173 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1174 <td>320 dpi (xhdpi)</td>
1175 <td>128MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1176 </tr>
1177 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1178 <td>400 dpi (400dpi)</td>
1179 <td>192MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1180 </tr>
1181 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1182 <td>480 dpi (xxhdpi)</td>
1183 <td>256MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1184 </tr>
1185 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1186 <td>560 dpi (560dpi)</td>
1187 <td>384MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1188 </tr>
1189 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1190 <td>640 dpi (xxxhdpi)</td>
1191 <td>512MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1192 </tr>
1193 <tr>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1194 <td rowspan="10">xlarge</td>
1195 <td>120 dpi (ldpi)</td>
1196 <td>48MB</td>
1197 </tr>
1198 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1199 <td>160 dpi (mdpi)</td>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1200 <td>80MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1201 </tr>
1202 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1203 <td>213 dpi (tvdpi)</td>
Unsuk Jung7a702af2015-06-05 02:26:23 -0700[diff] [blame]1204 <td rowspan="2">96MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1205 </tr>
1206 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1207 <td>240 dpi (hdpi)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1208 </tr>
1209 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1210 <td>280 dpi (280dpi)</td>
1211 <td>144MB</td>
Unsuk Jungaa55a672015-04-01 08:30:23 -0700[diff] [blame]1212 </tr>
1213 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1214 <td>320 dpi (xhdpi)</td>
1215 <td>192MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1216 </tr>
1217 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1218 <td>400 dpi (400dpi)</td>
1219 <td>288MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1220 </tr>
1221 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1222 <td>480 dpi (xxhdpi)</td>
1223 <td>384MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1224 </tr>
1225 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1226 <td>560 dpi (560dpi)</td>
1227 <td>576MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1228 </tr>
1229 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1230 <td>640 dpi (xxxhdpi)</td>
1231 <td>768MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1232 </tr>
1233</table>
1234
1235
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1236<h2 id="3_8_user_interface_compatibility">3.8. User Interface Compatibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1237
1238
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1239<h3 id="3_8_1_launcher_home_screen">3.8.1. Launcher (Home Screen)</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1240
1241
1242<p>Android includes a launcher application (home screen) and support for
1243third-party applications to replace the device launcher (home screen). Device
1244implementations that allow third-party applications to replace the device home
1245screen MUST declare the platform feature android.software.home_screen.</p>
1246
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1247<h3 id="3_8_2_widgets">3.8.2. Widgets</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1248
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1249<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1250<p>Widgets are optional for all Android device implementations, but SHOULD be
1251supported on Android Handheld devices.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1252</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1253
1254
1255<p>Android defines a component type and corresponding API and lifecycle that
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1256allows applications to expose an &ldquo;AppWidget&rdquo; to the end user [<a href="http://developer.android.com/guide/practices/ui_guidelines/widget_design.html">Resources, 21</a>] a feature that is strongly RECOMMENDED to be supported on Handheld Device
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1257implementations. Device implementations that support embedding widgets on the
1258home screen MUST meet the following requirements and declare support for
1259platform feature android.software.app_widgets.</p>
1260
1261<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1262 <li>Device launchers MUST include built-in support for AppWidgets, and expose user
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1263interface affordances to add, configure, view, and remove AppWidgets directly
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1264within the Launcher.</li>
1265 <li>Device implementations MUST be capable of rendering widgets that are 4 x 4 in
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1266the standard grid size. See the App Widget Design Guidelines in the Android SDK
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1267documentation [<a href="http://developer.android.com/guide/practices/ui_guidelines/widget_design.html">Resources, 21</a>] for details.</li>
1268 <li>Device implementations that include support for lock screen MAY support
1269application widgets on the lock screen.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1270</ul>
1271
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1272<h3 id="3_8_3_notifications">3.8.3. Notifications</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1273
1274
1275<p>Android includes APIs that allow developers to notify users of notable events [<a href="http://developer.android.com/guide/topics/ui/notifiers/notifications.html">Resources, 22</a>], using hardware and software features of the device.</p>
1276
1277<p>Some APIs allow applications to perform notifications or attract attention
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1278using hardware&#8212;specifically sound, vibration, and light. Device implementations
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1279MUST support notifications that use hardware features, as described in the SDK
1280documentation, and to the extent possible with the device implementation
1281hardware. For instance, if a device implementation includes a vibrator, it MUST
1282correctly implement the vibration APIs. If a device implementation lacks
1283hardware, the corresponding APIs MUST be implemented as no-ops. This behavior
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1284is further detailed in <a href="#7_hardware_compatibility">section 7</a>.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1285
1286<p>Additionally, the implementation MUST correctly render all resources (icons,
1287sound files, etc.) provided for in the APIs [<a href="https://developer.android.com/guide/topics/resources/available-resources.html">Resources, 23</a>], or in the Status/System Bar icon style guide [<a href="http://developer.android.com/design/style/iconography.html">Resources, 24</a>]. Device implementers MAY provide an alternative user experience for
1288notifications than that provided by the reference Android Open Source
1289implementation; however, such alternative notification systems MUST support
1290existing notification resources, as above. </p>
1291
1292<p>Android includes support for various notifications, such as:</p>
1293
1294<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1295 <li><strong>Rich notifications</strong>. Interactive Views for ongoing notifications.</li>
1296 <li><strong>Heads-up notifications</strong>. Interactive Views users can act on or dismiss without leaving the current app.</li>
1297 <li><strong>Lockscreen notifications</strong>. Notifications shown over a lock screen with granular control on visibility.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1298</ul>
1299
1300<p>Device implementations MUST properly display and execute these notifications,
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1301including the title/name, icon, text as documented in the Android APIs <a href="http://developer.android.com/design/patterns/notifications.html">[Resources, 25]</a>.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1302
1303<p>Android includes Notification Listener Service APIs that allow apps (once
1304explicitly enabled by the user) to receive a copy of all notifications as they
1305are posted or updated. Device implementations MUST correctly and promptly send
1306notifications in their entirety to all such installed and user-enabled listener
1307services, including any and all metadata attached to the Notification object.</p>
1308
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1309<h3 id="3_8_4_search">3.8.4. Search</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1310
1311
1312<p>Android includes APIs [<a href="http://developer.android.com/reference/android/app/SearchManager.html">Resources, 26</a>] that allow developers to incorporate search into their applications, and
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1313expose their application&rsquo;s data into the global system search. Generally
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1314speaking, this functionality consists of a single, system-wide user interface
1315that allows users to enter queries, displays suggestions as users type, and
1316displays results. The Android APIs allow developers to reuse this interface to
1317provide search within their own apps, and allow developers to supply results to
1318the common global search user interface.</p>
1319
1320<p>Android device implementations SHOULD include global search, a single, shared,
1321system-wide search user interface capable of real-time suggestions in response
1322to user input. Device implementations SHOULD implement the APIs that allow
1323developers to reuse this user interface to provide search within their own
1324applications. Device implementations that implement the global search interface
1325MUST implement the APIs that allow third-party applications to add suggestions
1326to the search box when it is run in global search mode. If no third-party
1327applications are installed that make use of this functionality, the default
1328behavior SHOULD be to display web search engine results and suggestions.</p>
1329
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1330<h3 id="3_8_5_toasts">3.8.5. Toasts</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1331
1332
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1333<p>Applications can use the &ldquo;Toast&rdquo; API to display short non-modal strings to the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1334end user, that disappear after a brief period of time [<a href="http://developer.android.com/reference/android/widget/Toast.html">Resources, 27</a>]. Device implementations MUST display Toasts from applications to end users in
1335some high-visibility manner.</p>
1336
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1337<h3 id="3_8_6_themes">3.8.6. Themes</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1338
1339
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1340<p>Android provides &ldquo;themes&rdquo; as a mechanism for applications to apply styles
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1341across an entire Activity or application.</p>
1342
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1343<p>Android includes a &ldquo;Holo&rdquo; theme family as a set of defined styles for
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1344application developers to use if they want to match the Holo theme look and
1345feel as defined by the Android SDK [<a href="http://developer.android.com/guide/topics/ui/themes.html">Resources, 28</a>]. Device implementations MUST NOT alter any of the Holo theme attributes
1346exposed to applications [<a href="http://developer.android.com/reference/android/R.style.html">Resources, 29</a>].</p>
1347
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1348<p>Android includes a &ldquo;Material&rdquo; theme family as a set of defined styles for
1349application developers to use if they want to match the design theme&rsquo;s look and
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1350feel across the wide variety of different Android device types. Device
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1351implementations MUST support the &ldquo;Material&rdquo; theme family and MUST NOT alter any
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1352of the Material theme attributes or their assets exposed to applications [<a href="http://developer.android.com/reference/android/R.style.html#Theme_Material">Resources, 30</a>].</p>
1353
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1354<p>Android also includes a &ldquo;Device Default&rdquo; theme family as a set of defined
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1355styles for application developers to use if they want to match the look and
1356feel of the device theme as defined by the device implementer. Device
1357implementations MAY modify the Device Default theme attributes exposed to
1358applications [<a href="http://developer.android.com/reference/android/R.style.html">Resources, 29</a>].</p>
1359
1360<p>Android supports a new variant theme with translucent system bars, which allows
1361application developers to fill the area behind the status and navigation bar
1362with their app content. To enable a consistent developer experience in this
1363configuration, it is important the status bar icon style is maintained across
1364different device implementations. Therefore, Android device implementations
1365MUST use white for system status icons (such as signal strength and battery
1366level) and notifications issued by the system, unless the icon is indicating a
1367problematic status [<a href="http://developer.android.com/reference/android/R.style.html">Resources, 29</a>].</p>
1368
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1369<h3 id="3_8_7_live_wallpapers">3.8.7. Live Wallpapers</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1370
1371
1372<p>Android defines a component type and corresponding API and lifecycle that
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1373allows applications to expose one or more &ldquo;Live Wallpapers&rdquo; to the end user [<a href="http://developer.android.com/reference/android/service/wallpaper/WallpaperService.html">Resources, 31</a>]. Live wallpapers are animations, patterns, or similar images with limited
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1374input capabilities that display as a wallpaper, behind other applications.</p>
1375
1376<p>Hardware is considered capable of reliably running live wallpapers if it can
1377run all live wallpapers, with no limitations on functionality, at a reasonable
1378frame rate with no adverse effects on other applications. If limitations in the
1379hardware cause wallpapers and/or applications to crash, malfunction, consume
1380excessive CPU or battery power, or run at unacceptably low frame rates, the
1381hardware is considered incapable of running live wallpaper. As an example, some
1382live wallpapers may use an OpenGL 2.0 or 3.x context to render their content.
1383Live wallpaper will not run reliably on hardware that does not support multiple
1384OpenGL contexts because the live wallpaper use of an OpenGL context may
1385conflict with other applications that also use an OpenGL context.</p>
1386
1387<p>Device implementations capable of running live wallpapers reliably as described
1388above SHOULD implement live wallpapers, and when implemented MUST report the
1389platform feature flag android.software.live_wallpaper.</p>
1390
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1391<h3 id="3_8_8_activity_switching">3.8.8. Activity Switching</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1392
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1393<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1394<p>As the Recent function navigation key is OPTIONAL, the requirements to
1395implement the overview screen is OPTIONAL for Android Television devices and
1396Android Watch devices.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1397</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1398
1399
1400<p>The upstream Android source code includes the overview screen [<a href="http://developer.android.com/guide/components/recents.html">Resources, 32</a>], a system-level user interface for task switching and displaying recently
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1401accessed activities and tasks using a thumbnail image of the application&rsquo;s
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1402graphical state at the moment the user last left the application. Device
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1403implementations including the recents function navigation key as detailed in <a href="#7_2_3_navigation_keys">section 7.2.3</a>, MAY alter the interface but MUST meet the following requirements:</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1404
1405<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1406 <li>MUST display affiliated recents as a group that moves together.</li>
1407 <li>MUST support at least up to 20 displayed activities.</li>
1408 <li>MUST at least display the title of 4 activities at a time.</li>
1409 <li>SHOULD display highlight color, icon, screen title in recents.</li>
1410 <li>MUST implement the screen pinning behavior [<a href="http://developer.android.com/about/versions/android-5.0.html#ScreenPinning">Resources, 33</a>] and provide the user with a settings menu to toggle the feature.</li>
1411 <li>SHOULD display a closing affordance ("x") but MAY delay this until user
1412interacts with screens.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1413</ul>
1414
1415<p>Device implementations are STRONGLY ENCOURAGED to use the upstream Android user
1416interface (or a similar thumbnail-based interface) for the overview screen.</p>
1417
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1418<h3 id="3_8_9_input_management">3.8.9. Input Management</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1419
1420
1421<p>Android includes support for Input Management and support for third-party input
1422method editors [<a href="http://developer.android.com/guide/topics/text/creating-input-method.html">Resources, 34</a>]. Device implementations that allow users to use third-party input methods on
1423the device MUST declare the platform feature android.software.input_methods and
1424support IME APIs as defined in the Android SDK documentation.</p>
1425
1426<p>Device implementations that declare the android.software.input_methods feature
1427MUST provide a user-accessible mechanism to add and configure third-party input
1428methods. Device implementations MUST display the settings interface in response
1429to the android.settings.INPUT_METHOD_SETTINGS intent.</p>
1430
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1431<h3 id="3_8_10_lock_screen_media_control">3.8.10. Lock Screen Media Control</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1432
1433
1434<p>The Remote Control Client API is deprecated from Android 5.0 in favor of the
1435Media Notification Template that allows media applications to integrate with
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1436playback controls that are displayed on the lock screen [<a href="http://developer.android.com/reference/android/app/Notification.MediaStyle.html">Resources, 35</a>]. Device implementations that support a lock screen in the device MUST support
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1437the Media Notification Template along with other notifications.</p>
1438
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1439<h3 id="3_8_11_dreams">3.8.11. Dreams</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1440
1441
1442<p>Android includes support for interactive screensavers called Dreams [<a href="http://developer.android.com/reference/android/service/dreams/DreamService.html">Resources, 36</a>]. Dreams allows users to interact with applications when a device connected to
1443a power source is idle or docked in a desk dock. Android Watch devices MAY
1444implement Dreams, but other types of device implementations SHOULD include
1445support for Dreams and provide a settings option for users to configure Dreams
1446in response to the android.settings.DREAM_SETTINGS intent.</p>
1447
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1448<h3 id="3_8_12_location">3.8.12. Location</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1449
1450
1451<p>When a device has a hardware sensor (e.g. GPS) that is capable of providing the
1452location coordinates, location modes MUST be displayed in the Location menu
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1453within Settings [<a href="http://developer.android.com/reference/android/provider/Settings.Secure.html#LOCATION_MODE">Resources, 37</a>].</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1454
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1455<h3 id="3_8_13_unicode_and_font">3.8.13. Unicode and Font</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1456
1457
1458<p>Android includes support for color emoji characters. When Android device
1459implementations include an IME, devices MUST provide an input method to the
1460user for the Emoji characters defined in Unicode 6.1 [<a href="http://www.unicode.org/versions/Unicode6.1.0/">Resources, 38</a>]. All devices MUST be capable of rendering these emoji characters in color
1461glyph.</p>
1462
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]1463<p>Android includes support for Roboto 2 font with different
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1464weights&mdash;sans-serif-thin, sans-serif-light, sans-serif-medium, sans-serif-black,
1465sans-serif-condensed, sans-serif-condensed-light&mdash;which MUST all be included for
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1466the languages available on the device and full Unicode 7.0 coverage of Latin,
1467Greek, and Cyrillic, including the Latin Extended A, B, C, and D ranges, and
1468all glyphs in the currency symbols block of Unicode 7.0.</p>
1469
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1470<h2 id="3_9_device_administration">3.9. Device Administration</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1471
1472
1473<p>Android includes features that allow security-aware applications to perform
1474device administration functions at the system level, such as enforcing password
1475policies or performing remote wipe, through the Android Device Administration
Unsuk Jung18378642015-05-18 19:26:50 -0700[diff] [blame]1476API [<a href="http://developer.android.com/guide/topics/admin/device-admin.html">Resources, 39</a>].
1477Device implementations MUST provide an implementation of the DevicePolicyManager class
1478[<a href="http://developer.android.com/reference/android/app/admin/DevicePolicyManager.html">Resources, 40</a>].
1479Device implementations that include support for PIN (numeric) or PASSWORD
1480(alphanumeric) based lock screens MUST support the full range of device
1481administration policies defined in the Android SDK documentation
1482[<a href="http://developer.android.com/guide/topics/admin/device-admin.html">Resources, 39</a>]
1483and report the platform feature android.software.device_admin.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1484
1485<p>Device implementations MAY have a preinstalled application performing device
1486administration functions but this application MUST NOT be set out-of-the box as
1487the default Device Owner app [<a href="http://developer.android.com/reference/android/app/admin/DevicePolicyManager.html#isDeviceOwnerApp(java.lang.String)">Resources, 41</a>].</p>
1488
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1489<h2 id="3_10_accessibility">3.10. Accessibility</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1490
1491
1492<p>Android provides an accessibility layer that helps users with disabilities to
1493navigate their devices more easily. In addition, Android provides platform APIs
1494that enable accessibility service implementations to receive callbacks for user
1495and system events and generate alternate feedback mechanisms, such as
1496text-to-speech, haptic feedback, and trackball/d-pad navigation [<a href="http://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html">Resources, 42</a>]. Device implementations MUST provide an implementation of the Android
1497accessibility framework consistent with the default Android implementation.
1498Device implementations MUST meet the following requirements:</p>
1499
1500<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1501 <li>MUST support third-party accessibility service implementations through the
1502android.accessibilityservice APIs [<a href="http://developer.android.com/reference/android/view/accessibility/package-summary.html">Resources, 43</a>].</li>
1503 <li>MUST generate AccessibilityEvents and deliver these events to all registered
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1504AccessibilityService implementations in a manner consistent with the default
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1505Android implementation.</li>
1506 <li>Unless an Android Watch device with no audio output, device implementations
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1507MUST provide a user-accessible mechanism to enable and disable accessibility
1508services, and MUST display this interface in response to the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1509android.provider.Settings.ACTION_ACCESSIBILITY_SETTINGS intent.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1510</ul>
1511
1512<p>Additionally, device implementations SHOULD provide an implementation of an
1513accessibility service on the device, and SHOULD provide a mechanism for users
1514to enable the accessibility service during device setup. An open source
1515implementation of an accessibility service is available from the Eyes Free
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1516project [<a href="http://code.google.com/p/eyes-free/">Resources, 44</a>].</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1517
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1518<h2 id="3_11_text-to-speech">3.11. Text-to-Speech</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1519
1520
1521<p>Android includes APIs that allow applications to make use of text-to-speech
1522(TTS) services and allows service providers to provide implementations of TTS
1523services [<a href="http://developer.android.com/reference/android/speech/tts/package-summary.html">Resources, 45</a>]. Device implementations reporting the feature android.hardware.audio.output
1524MUST meet these requirements related to the Android TTS framework. </p>
1525
Heidi von Markhame400e052015-05-26 14:35:49 -0700[diff] [blame]1526<p>Android Automotive implementations:</p>
1527<ul>
1528<li>MUST support the Android TTS framework APIs.</li>
1529<li>MAY support installation of third-party TTS engines. If supported, partners
1530MUST provide a user-accessible interface that allows the user to select a TTS
1531engine for use at system level.</li>
1532</ul>
1533
1534<p>All other device implementations:</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1535
1536<ul>
Heidi von Markhame400e052015-05-26 14:35:49 -0700[diff] [blame]1537 <li> MUST support the Android TTS framework APIs and SHOULD include a TTS engine
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1538supporting the languages available on the device. Note that the upstream
1539Android open source software includes a full-featured TTS engine
Heidi von Markhame400e052015-05-26 14:35:49 -0700[diff] [blame]1540implementation.
1541 <li> MUST support installation of third-party TTS engines
1542 <li> MUST provide a user-accessible interface that allows users to select a TTS
1543engine for use at the system level
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1544</ul>
1545
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1546<h2 id="3_12_tv_input_framework">3.12. TV Input Framework</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1547
1548
1549<p>The Android Television Input Framework (TIF) simplifies the delivery of live
1550content to Android Television devices. TIF provides a standard API to create
1551input modules that control Android Television devices. Android Television
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1552device implementations MUST support Television Input Framework [<a href="http://source.android.com/devices/tv/index.html">Resources, 46</a>].</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1553
1554<p>Device implementations that support TIF MUST declare the platform feature
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1555android.software.live_tv.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1556
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1557<h1 id="4_application_packaging_compatibility">4. Application Packaging Compatibility</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1558
1559
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1560<p>Device implementations MUST install and run Android &ldquo;.apk&rdquo; files as generated
1561by the &ldquo;aapt&rdquo; tool included in the official Android SDK [<a href="http://developer.android.com/tools/help/index.html">Resources, 47</a>].</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1562
1563<p>Devices implementations MUST NOT extend either the .apk [<a href="http://developer.android.com/guide/components/fundamentals.html">Resources, 48</a>], Android Manifest [<a href="http://developer.android.com/guide/topics/manifest/manifest-intro.html">Resources, 49</a>], Dalvik bytecode [<a href="https://android.googlesource.com/platform/dalvik/+/lollipop-release/docs/">Resources, 20</a>], or RenderScript bytecode formats in such a way that would prevent those
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1564files from installing and running correctly on other compatible devices.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1565
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1566<h1 id="5_multimedia_compatibility">5. Multimedia Compatibility</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1567
1568
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1569<h2 id="5_1_media_codecs">5.1. Media Codecs</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1570
1571
1572<p>Device implementations MUST support the core media formats specified in the
1573Android SDK documentation [<a href="http://developer.android.com/guide/appendix/media-formats.html">Resources, 50</a>] except where explicitly permitted in this document. Specifically, device
1574implementations MUST support the media formats, encoders, decoders, file types,
1575and container formats defined in the tables below. All of these codecs are
1576provided as software implementations in the preferred Android implementation
1577from the Android Open Source Project.</p>
1578
1579<p>Please note that neither Google nor the Open Handset Alliance make any
1580representation that these codecs are free from third-party patents. Those
1581intending to use this source code in hardware or software products are advised
1582that implementations of this code, including in open source software or
1583shareware, may require patent licenses from the relevant patent holders.</p>
1584
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1585<h3 id="5_1_1_audio_codecs">5.1.1. Audio Codecs</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1586
1587<table>
1588 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1589 <th>Format/Codec</th>
1590 <th>Encoder</th>
1591 <th>Decoder</th>
1592 <th>Details</th>
1593 <th>Supported File Types/Container Formats</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1594 </tr>
1595 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1596 <td>MPEG-4 AAC Profile</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1597
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1598<p>(AAC LC)</td>
1599 <td>REQUIRED<sup>1</sup></td>
1600 <td>REQUIRED</td>
1601 <td>Support for mono/stereo/5.0/5.12 content with standard sampling rates from 8 to
160248 kHz.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1603 <td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1604 <ul>
1605 <li class="table_list">3GPP (.3gp)</li>
1606 <li class="table_list">MPEG-4 (.mp4, .m4a)</li>
1607 <li class="table_list">ADTS raw AAC (.aac, decode in Android 3.1+, encode in Android 4.0+, ADIF not
1608supported)</li>
1609 <li class="table_list">MPEG-TS (.ts, not seekable, Android 3.0+)</li></ul></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1610 </tr>
1611 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1612 <td>MPEG-4 HE AAC Profile (AAC+)</td>
1613 <td>REQUIRED<sup>1</sup><br>(Android 4.1+)</td>
1614 <td>REQUIRED</td>
1615 <td>Support for mono/stereo/5.0/5.12 content with standard sampling rates from 16
1616to 48 kHz.</td>
1617 <td></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1618 </tr>
1619 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1620 <td>MPEG-4 HE AACv2</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1621
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1622<p>Profile (enhanced AAC+)</td>
1623 <td> </td>
1624 <td>REQUIRED</td>
1625 <td>Support for mono/stereo/5.0/5.12 content with standard sampling rates from 16
1626to 48 kHz.</td>
1627 <td></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1628 </tr>
1629 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1630 <td>AAC ELD (enhanced low delay AAC)</td>
1631 <td>REQUIRED<sup>1</sup> </p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1632
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1633<p>(Android 4.1+)</td>
1634 <td>REQUIRED</p>
1635
1636<p>(Android 4.1+)</td>
1637 <td>Support for mono/stereo content with standard sampling rates from 16 to 48 kHz.</td>
1638 <td></td>
1639 </tr>
1640 <tr>
1641 <td>AMR-NB</td>
1642 <td>REQUIRED<sup>3</sup></td>
1643 <td>REQUIRED<sup>3</sup></td>
1644 <td>4.75 to 12.2 kbps sampled @ 8kHz</td>
1645 <td>3GPP (.3gp)</td>
1646 </tr>
1647 <tr>
1648 <td>AMR-WB</td>
1649 <td>REQUIRED<sup>3</sup></td>
1650 <td>REQUIRED<sup>3</sup></td>
1651 <td>9 rates from 6.60 kbit/s to 23.85 kbit/s sampled @ 16kHz</td>
1652 <td></td>
1653 </tr>
1654 <tr>
1655 <td>FLAC</td>
1656 <td></td>
1657 <td>REQUIRED <br>(Android 3.1+)</td>
1658 <td>Mono/Stereo (no multichannel). Sample rates up to 48 kHz (but up to 44.1 kHz is
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1659recommended on devices with 44.1 kHz output, as the 48 to 44.1 kHz downsampler
1660does not include a low-pass filter). 16-bit recommended; no dither applied for
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]166124-bit.</td>
1662 <td>FLAC (.flac) only</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1663 </tr>
1664 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1665 <td>MP3</td>
1666 <td></td>
1667 <td>REQUIRED</td>
1668 <td>Mono/Stereo 8-320Kbps constant (CBR) or variable bitrate (VBR)</td>
1669 <td>MP3 (.mp3)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1670 </tr>
1671 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1672 <td>MIDI</td>
1673 <td></td>
1674 <td>REQUIRED</td>
1675 <td>MIDI Type 0 and 1. DLS Version 1 and 2. XMF and Mobile XMF. Support for
1676ringtone formats RTTTL/RTX, OTA, and iMelody</td>
1677 <td><ul>
1678 <li class="table_list">Type 0 and 1 (.mid, .xmf, .mxmf)</li>
1679 <li class="table_list">RTTTL/RTX (.rtttl, .rtx)</li>
1680 <li class="table_list">OTA (.ota)</li>
1681 <li class="table_list">iMelody (.imy)</li></ul></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1682 </tr>
1683 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1684 <td>Vorbis</td>
1685 <td></td>
1686 <td>REQUIRED</td>
1687 <td></td>
1688 <td><ul>
1689 <li class="table_list">Ogg (.ogg)</li>
1690 <li class="table_list">Matroska (.mkv, Android 4.0+)</li></ul></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1691 </tr>
1692 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1693 <td>PCM/WAVE</td>
1694 <td>REQUIRED<sup>4</sup><br> (Android 4.1+)</td>
1695 <td>REQUIRED</td>
1696 <td>16-bit linear PCM (rates up to limit of hardware). Devices MUST support
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1697sampling rates for raw PCM recording at 8000, 11025, 16000, and 44100 Hz
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1698frequencies.</td>
1699 <td>WAVE (.wav)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1700 </tr>
1701 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1702 <td>Opus</td>
1703 <td></td>
1704 <td>REQUIRED<br> (Android 5.0+)</td>
1705 <td></td>
1706 <td>Matroska (.mkv)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1707 </tr>
1708</table>
1709
1710
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1711<p class="table_footnote"> 1 Required for device implementations that define android.hardware.microphone
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1712but optional for Android Watch device implementations.</p>
1713
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1714<p class="table_footnote">2 Only downmix of 5.0/5.1 content is required; recording or rendering more than
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]17152 channels is optional.</p>
1716
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1717<p class="table_footnote">3 Required for Android Handheld device implementations. </p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1718
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1719<p class="table_footnote">4 Required for device implementations that define android.hardware.microphone,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1720including Android Watch device implementations.</p>
1721
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1722<h3 id="5_1_2_image_codecs">5.1.2. Image Codecs</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1723
1724<table>
1725 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1726 <th>Format/Codec</th>
1727 <th>Encoder</th>
1728 <th>Decoder</th>
1729 <th>Details</th>
1730 <th>Supported File Types/Container Formats</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1731 </tr>
1732 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1733 <td>JPEG</td>
1734 <td>REQUIRED</td>
1735 <td>REQUIRED</td>
1736 <td>Base+progressive</td>
1737 <td>JPEG (.jpg)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1738 </tr>
1739 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1740 <td>GIF</td>
1741 <td></td>
1742 <td>REQUIRED</td>
1743 <td></td>
1744 <td>GIF (.gif)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1745 </tr>
1746 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1747 <td>PNG</td>
1748 <td>REQUIRED</td>
1749 <td>REQUIRED</td>
1750 <td></td>
1751 <td>PNG (.png)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1752 </tr>
1753 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1754 <td>BMP</td>
1755 <td></td>
1756 <td>REQUIRED</td>
1757 <td></td>
1758 <td>BMP (.bmp)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1759 </tr>
1760 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1761 <td>WebP</td>
1762 <td>REQUIRED</td>
1763 <td>REQUIRED</td>
1764 <td></td>
1765 <td>WebP (.webp)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1766 </tr>
1767</table>
1768
1769
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1770<h3 id="5_1_3_video_codecs">5.1.3. Video Codecs</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1771
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1772<div class="div">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1773<p>Video codecs are optional for Android Watch device implementations.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1774</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1775
1776<table>
1777 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1778 <th>Format/Codec</th>
1779 <th>Encoder</th>
1780 <th>Decoder</th>
1781 <th>Details</th>
1782 <th>Supported File Types/Container Formats</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1783 </tr>
1784 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1785 <td>H.263</td>
1786 <td>REQUIRED<sup>1</sup></td>
1787 <td>REQUIRED<sup>2</sup></td>
1788 <td></td>
1789 <td><ul>
1790 <li class="table_list">3GPP (.3gp)</li>
1791 <li class="table_list">MPEG-4 (.mp4)</li></ul></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1792 </tr>
1793 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1794 <td>H.264 AVC</td>
1795 <td>REQUIRED<sup>2</sup></td>
1796 <td>REQUIRED<sup>2</sup></td>
1797 <td>See <a href="#5_2_video_encoding">section 5.2 </a>and <a href="#5_3_video_decoding">5.3</a> for details</td>
1798 <td><ul>
1799 <li class="table_list">3GPP (.3gp)</li>
1800 <li class="table_list">MPEG-4 (.mp4)</li>
1801 <li class="table_list">MPEG-TS (.ts, AAC audio only, not seekable, Android 3.0+)</li></ul></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1802 </tr>
1803 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1804 <td>H.265 HEVC</td>
1805 <td></td>
1806 <td>REQUIRED<sup>2</sup></td>
1807 <td>See <a href="#5_3_video_decoding">section 5.3</a> for details</td>
1808 <td>MPEG-4 (.mp4)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1809 </tr>
1810 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1811 <td>MPEG-4 SP</td>
1812 <td></td>
1813 <td>REQUIRED<sup>2</sup></td>
1814 <td></td>
1815 <td>3GPP (.3gp)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1816 </tr>
1817 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1818 <td>VP83</td>
1819 <td>REQUIRED<sup>2</sup></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1820
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1821<p>(Android 4.3+)</td>
1822 <td>REQUIRED<sup>2</sup></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1823
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1824<p>(Android 2.3.3+)</td>
1825 <td>See <a href="#5_2_video_encoding">section 5.2</a> and <a href="#5_3_video_decoding">5.3</a> for details</td>
1826 <td><ul>
1827 <li class="table_list">WebM (.webm) [<a href="http://www.webmproject.org/">Resources, 110</a></li>
1828 <li class="table_list">Matroska (.mkv, Android 4.0+)4</li></ul></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1829 </tr>
1830 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1831 <td>VP9</td>
1832 <td></td>
1833 <td>REQUIRED<sup>2</sup><br> (Android 4.4+)</td>
1834 <td>See <a href="#5_3_video_decoding">section 5.3</a> for details</td>
1835 <td><ul>
1836 <li class="table_list">WebM (.webm) [<a href="http://www.webmproject.org/">Resources, 110</a>]</li>
1837 <li class="table_list">Matroska (.mkv, Android 4.0+)4</li></ul></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1838 </tr>
1839</table>
1840
1841
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1842<p class="table_footnote">1 Required for device implementations that include camera hardware and define
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1843android.hardware.camera or android.hardware.camera.front.</p>
1844
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1845<p class="table_footnote">2 Required for device implementations except Android Watch devices. </p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1846
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1847<p class="table_footnote">3 For acceptable quality of web video streaming and video-conference services,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1848device implementations SHOULD use a hardware VP8 codec that meets the
1849requirements in [<a href="http://www.webmproject.org/hardware/rtc-coding-requirements/">Resources, 51</a>].</p>
1850
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1851<p class="table_footnote">4 Device implementations SHOULD support writing Matroska WebM files.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1852
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1853<h2 id="5_2_video_encoding">5.2. Video Encoding</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1854
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1855<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1856<p>Video codecs are optional for Android Watch device implementations.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1857</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1858
1859
1860<p>Android device implementations with H.264 codec support, MUST support Baseline
1861Profile Level 3 and the following SD (Standard Definition) video encoding
1862profiles and SHOULD support Main Profile Level 4 and the following HD (High
1863Definition) video encoding profiles. Android Television devices are STRONGLY
1864RECOMMENDED to encode HD 1080p video at 30 fps.</p>
1865<table>
1866 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1867 <th></th>
1868 <th>SD (Low quality)</th>
1869 <th>SD (High quality)</th>
1870 <th>HD 720p1</th>
1871 <th>HD 1080p1</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1872 </tr>
1873 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1874 <th>Video resolution</th>
1875 <td>320 x 240 px</td>
1876 <td>720 x 480 px</td>
1877 <td>1280 x 720 px</td>
1878 <td>1920 x 1080 px</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1879 </tr>
1880 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1881 <th>Video frame rate</th>
1882 <td>20 fps</td>
1883 <td>30 fps</td>
1884 <td>30 fps</td>
1885 <td>30 fps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1886 </tr>
1887 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1888 <th>Video bitrate</th>
1889 <td>384 Kbps</td>
1890 <td>2 Mbps</td>
1891 <td>4 Mbps</td>
1892 <td>10 Mbps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1893 </tr>
1894</table>
1895
1896
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1897<p class="table_footnote">1 When supported by hardware, but STRONGLY RECOMMENDED for Android Television
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1898devices.</p>
1899
1900<p>Android device implementations with VP8 codec support MUST support the SD video
1901encoding profiles and SHOULD support the following HD (High Definition) video
1902encoding profiles.</p>
1903<table>
1904 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1905 <th></th>
1906 <th>SD (Low quality)</th>
1907 <th>SD (High quality)</th>
1908 <th>HD 720p1</th>
1909 <th>HD 1080p1</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1910 </tr>
1911 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1912 <th>Video resolution</th>
1913 <td>320 x 180 px</td>
1914 <td>640 x 360 px</td>
1915 <td>1280 x 720 px</td>
1916 <td>1920 x 1080 px</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1917 </tr>
1918 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1919 <th>Video frame rate</th>
1920 <td>30 fps</td>
1921 <td>30 fps</td>
1922 <td>30 fps</td>
1923 <td>30 fps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1924 </tr>
1925 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1926 <th>Video bitrate</th>
1927 <td>800 Kbps </td>
1928 <td>2 Mbps</td>
1929 <td>4 Mbps</td>
1930 <td>10 Mbps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1931 </tr>
1932</table>
1933
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1934<p class="table_footnote">1 When supported by hardware.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1935
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1936<h2 id="5_3_video_decoding">5.3. Video Decoding</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1937
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1938<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1939<p>Video codecs are optional for Android Watch device implementations.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1940</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1941
1942
1943<p>Device implementations MUST support dynamic video resolution switching within
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1944the same stream for VP8, VP9, H.264, and H.265 codecs.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1945
1946<p>Android device implementations with H.264 decoders, MUST support Baseline
1947Profile Level 3 and the following SD video decoding profiles and SHOULD support
1948the HD decoding profiles. Android Television devices MUST support High Profile
1949Level 4.2 and the HD 1080p decoding profile.</p>
1950<table>
1951 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1952 <th></th>
1953 <th>SD (Low quality)</th>
1954 <th>SD (High quality)</th>
1955 <th>HD 720p1</th>
1956 <th>HD 1080p1</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1957 </tr>
1958 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1959 <th>Video resolution</th>
1960 <td>320 x 240 px</td>
1961 <td>720 x 480 px</td>
1962 <td>1280 x 720 px</td>
1963 <td>1920 x 1080 px</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1964 </tr>
1965 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1966 <th>Video frame rate</th>
1967 <td>30 fps</td>
1968 <td>30 fps</td>
1969 <td>30 fps / 60 fps2</td>
1970 <td>30 fps / 60 fps2</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1971 </tr>
1972 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1973 <th>Video bitrate</th>
1974 <td>800 Kbps </td>
1975 <td>2 Mbps</td>
1976 <td>8 Mbps</td>
1977 <td>20 Mbps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1978 </tr>
1979</table>
1980
1981
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1982<p class="table_footnote">1 Required for Android Television device implementations, but for other device
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1983types only when supported by hardware.</p>
1984
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1985<p class="table_footnote">2 Required for Android Television device implementations.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1986
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1987<p>Android device implementations when supporting VP8 codec as described in <a href="#5_1_3_video_codecs">section 5.1.3</a>, MUST support the following SD decoding profiles and SHOULD support the HD
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1988decoding profiles. Android Television devices MUST support the HD 1080p
1989decoding profile. </p>
1990<table>
1991 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1992 <th></th>
1993 <th>SD (Low quality)</th>
1994 <th>SD (High quality)</th>
1995 <th>HD 720p1</th>
1996 <th>HD 1080p1</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]1997 </tr>
1998 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]1999 <th>Video resolution</th>
2000 <td>320 x 180 px</td>
2001 <td>640 x 360 px</td>
2002 <td>1280 x 720 px</td>
2003 <td>1920 x 1080 px</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2004 </tr>
2005 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2006 <th>Video frame rate</th>
2007 <td>30 fps</td>
2008 <td>30 fps</td>
2009 <td>30 fps / 60 fps2</td>
2010 <td>30 / 60 fps2</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2011 </tr>
2012 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2013 <th>Video bitrate</th>
2014 <td>800 Kbps </td>
2015 <td>2 Mbps</td>
2016 <td>8 Mbps</td>
2017 <td>20 Mbps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2018 </tr>
2019</table>
2020
2021
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2022<p class="table_footnote">1 Required for Android Television device implementations, but for other type of
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2023devices only when supported by hardware.</p>
2024
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2025<p class="table_footnote">2 Required for Android Television device implementations.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2026
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2027<p>Android device implementations, when supporting VP9 codec as described in <a href="#5_1_3_video_codecs">section 5.1.3</a>, MUST support the following SD video decoding profiles and SHOULD support the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2028HD decoding profiles. Android Television devices are STRONGLY RECOMMENDED to
2029support the HD 1080p decoding profile and SHOULD support the UHD decoding
2030profile. When the UHD video decoding profile is supported, it MUST support 8
2031bit color depth.</p>
2032<table>
2033 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2034 <th></th>
2035 <th>SD (Low quality)</th>
2036 <th>SD (High quality)</th>
2037 <th>HD 720p 1</th>
2038 <th>HD 1080p 2</th>
2039 <th>UHD 2</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2040 </tr>
2041 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2042 <th>Video resolution</th>
2043 <td>320 x 180 px</td>
2044 <td>640 x 360 px</td>
2045 <td>1280 x 720 px</td>
2046 <td>1920 x 1080 px</td>
2047 <td>3840 x 2160 px</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2048 </tr>
2049 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2050 <th>Video frame rate</th>
2051 <td>30 fps</td>
2052 <td>30 fps</td>
2053 <td>30 fps</td>
2054 <td>30 fps</td>
2055 <td>30 fps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2056 </tr>
2057 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2058 <th>Video bitrate</th>
2059 <td>600 Kbps </td>
2060 <td>1.6 Mbps</td>
2061 <td>4 Mbps</td>
2062 <td>10 Mbps</td>
2063 <td>20 Mbps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2064 </tr>
2065</table>
2066
2067
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2068<p class="table_footnote">1 Required for Android Television device implementations, but for other type of
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2069devices only when supported by hardware.</p>
2070
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2071<p class="table_footnote">2 STRONGLY RECOMMENDED for Android Television device implementations when
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2072supported by hardware.</p>
2073
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2074<p>Android device implementations, when supporting H.265 codec as described in <a href="#5_1_3_video_codecs">section 5.1.3</a>, MUST support the Main Profile Level 3 Main tier and the following SD video
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2075decoding profiles and SHOULD support the HD decoding profiles. Android
2076Television devices MUST support the Main Profile Level 4.1 Main tier and the HD
20771080p decoding profile and SHOULD support Main10 Level 5 Main Tier profile and
2078the UHD decoding profile.</p>
2079<table>
2080 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2081 <th></th>
2082 <th>SD (Low quality)</th>
2083 <th>SD (High quality)</th>
2084 <th>HD 720p </strong>1 </td>
2085 <th>HD 1080p </strong>1 </td>
2086 <th>UHD </strong>2</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2087 </tr>
2088 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2089 <th>Video resolution</th>
2090 <td>352 x 288 px</td>
2091 <td>640 x 360 px</td>
2092 <td>1280 x 720 px</td>
2093 <td>1920 x 1080 px</td>
2094 <td>3840 x 2160 px</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2095 </tr>
2096 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2097 <th>Video frame rate</th>
2098 <td>30 fps</td>
2099 <td>30 fps</td>
2100 <td>30 fps</td>
2101 <td>30 fps</td>
2102 <td>30 fps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2103 </tr>
2104 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2105 <th>Video bitrate</th>
2106 <td>600 Kbps </td>
2107 <td>1.6 Mbps</td>
2108 <td>4 Mbps</td>
2109 <td>10 Mbps</td>
2110 <td>20 Mbps</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2111 </tr>
2112</table>
2113
2114
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2115<p class="table_footnote">1 Required for Android Television device implementation, but for other type of
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2116devices only when supported by hardware.</p>
2117
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2118<p class="table_footnote">2 Required for Android Television device implementations when supported by
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2119hardware.</p>
2120
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2121<h2 id="5_4_audio_recording">5.4. Audio Recording</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2122
2123
2124<p>While some of the requirements outlined in this section are stated as SHOULD
2125since Android 4.3, the Compatibility Definition for a future version is planned
2126to change these to MUST. Existing and new Android devices are <strong>very strongly encouraged</strong> to meet these requirements, or they will not be able to attain Android
2127compatibility when upgraded to the future version.</p>
2128
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2129<h3 id="5_4_1_raw_audio_capture">5.4.1. Raw Audio Capture</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2130
2131
2132<p>Device implementations that declare android.hardware.microphone MUST allow
2133capture of raw audio content with the following characteristics:</p>
2134
2135<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2136 <li><strong>Format</strong>: Linear PCM, 16-bit
2137 <li><strong>Sampling rates</strong>: 8000, 11025, 16000, 44100
2138 <li><strong>Channels</strong>: Mono
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2139</ul>
2140
2141<p>Device implementations that declare android.hardware.microphone SHOULD allow
2142capture of raw audio content with the following characteristics:</p>
2143
2144<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2145 <li><strong>Format</strong>: Linear PCM, 16-bit
2146 <li><strong>Sampling rates</strong>: 22050, 48000
2147 <li><strong>Channels</strong>: Stereo
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2148</ul>
2149
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2150<h3 id="5_4_2_capture_for_voice_recognition">5.4.2. Capture for Voice Recognition</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2151
2152
2153<p>In addition to the above recording specifications, when an application has
2154started recording an audio stream using the
2155android.media.MediaRecorder.AudioSource.VOICE_RECOGNITION audio source:</p>
2156
2157<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2158 <li>The device SHOULD exhibit approximately flat amplitude versus frequency
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2159characteristics: specifically, ±3 dB, from 100 Hz to 4000 Hz.
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2160 <li>Audio input sensitivity SHOULD be set such that a 90 dB sound power level (SPL)
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2161source at 1000 Hz yields RMS of 2500 for 16-bit samples.
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2162 <li>PCM amplitude levels SHOULD linearly track input SPL changes over at least a 30
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2163dB range from -18 dB to +12 dB re 90 dB SPL at the microphone.
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2164 <li>Total harmonic distortion SHOULD be less than 1% for 1Khz at 90 dB SPL input
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2165level at the microphone.
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2166 <li>Noise reduction processing, if present, MUST be disabled.
2167 <li>Automatic gain control, if present, MUST be disabled
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2168</ul>
2169
2170<p>If the platform supports noise suppression technologies tuned for speech
2171recognition, the effect MUST be controllable from the
2172android.media.audiofx.NoiseSuppressor API. Moreover, the UUID field for the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2173noise suppressor&rsquo;s effect descriptor MUST uniquely identify each implementation
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2174of the noise suppression technology.</p>
2175
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2176<h3 id="5_4_3_capture_for_rerouting_of_playback">5.4.3. Capture for Rerouting of Playback</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2177
2178
2179<p>The android.media.MediaRecorder.AudioSource class includes the REMOTE_SUBMIX
2180audio source. Devices that declare android.hardware.audio.output MUST properly
2181implement the REMOTE_SUBMIX audio source so that when an application uses the
2182android.media.AudioRecord API to record from this audio source, it can capture
2183a mix of all audio streams except for the following:</p>
2184
2185<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2186 <li>STREAM_RING
2187 <li>STREAM_ALARM
2188 <li>STREAM_NOTIFICATION
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2189</ul>
2190
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2191<h2 id="5_5_audio_playback">5.5. Audio Playback</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2192
2193
2194<p>Device implementations that declare android.hardware.audio.output MUST conform
2195to the requirements in this section.</p>
2196
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2197<h3 id="5_5_1_raw_audio_playback">5.5.1. Raw Audio Playback</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2198
2199
2200<p>The device MUST allow playback of raw audio content with the following
2201characteristics:</p>
2202
2203<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2204 <li><strong>Format</strong>: Linear PCM, 16-bit</li>
2205 <li><strong>Sampling rates</strong>: 8000, 11025, 16000, 22050, 32000, 44100</li>
2206 <li><strong>Channels</strong>: Mono, Stereo</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2207</ul>
2208
2209<p>The device SHOULD allow playback of raw audio content with the following
2210characteristics:</p>
2211
2212<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2213 <li><strong>Sampling rates</strong>: 24000, 48000</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2214</ul>
2215
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2216<h3 id="5_5_2_audio_effects">5.5.2. Audio Effects</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2217
2218
2219<p>Android provides an API for audio effects for device implementations [<a href="http://developer.android.com/reference/android/media/audiofx/AudioEffect.html">Resources, 52</a>]. Device implementations that declare the feature
2220android.hardware.audio.output:</p>
2221
2222<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2223 <li>MUST support the EFFECT_TYPE_EQUALIZER and EFFECT_TYPE_LOUDNESS_ENHANCER
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2224implementations controllable through the AudioEffect subclasses Equalizer,
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2225LoudnessEnhancer.</li>
2226 <li>MUST support the visualizer API implementation, controllable through the
2227Visualizer class.</li>
2228 <li>SHOULD support the EFFECT_TYPE_BASS_BOOST, EFFECT_TYPE_ENV_REVERB,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2229EFFECT_TYPE_PRESET_REVERB, and EFFECT_TYPE_VIRTUALIZER implementations
2230controllable through the AudioEffect sub-classes BassBoost,
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2231EnvironmentalReverb, PresetReverb, and Virtualizer.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2232</ul>
2233
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2234<h3 id="5_5_3_audio_output_volume">5.5.3. Audio Output Volume</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2235
2236
2237<p>Android Television device implementations MUST include support for system
2238Master Volume and digital audio output volume attenuation on supported outputs,
2239except for compressed audio passthrough output (where no audio decoding is done
2240on the device).</p>
2241
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2242<h2 id="5_6_audio_latency">5.6. Audio Latency</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2243
2244
2245<p>Audio latency is the time delay as an audio signal passes through a system.
2246Many classes of applications rely on short latencies, to achieve real-time
2247sound effects.</p>
2248
2249<p>For the purposes of this section, use the following definitions:</p>
2250
2251<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2252 <li><strong>output latency</strong>. The interval between when an application writes a frame of PCM-coded data and
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2253when the corresponding sound can be heard by an external listener or observed
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2254by a transducer.</li>
2255 <li><strong>cold output latency</strong>. The output latency for the first frame, when the audio output system has been
2256idle and powered down prior to the request.</li>
2257 <li><strong>continuous output latency</strong>. The output latency for subsequent frames, after the device is playing audio.</li>
2258 <li><strong>input latency</strong>. The interval between when an external sound is presented to the device and
2259when an application reads the corresponding frame of PCM-coded data.</li>
2260 <li><strong>cold input latency</strong>. The sum of lost input time and the input latency for the first frame, when the
2261audio input system has been idle and powered down prior to the request.</li>
2262 <li><strong>continuous input latency</strong>. The input latency for subsequent frames, while the device is capturing audio.</li>
2263 <li><strong>cold output jitter</strong>. The variance among separate measurements of cold output latency values.</li>
2264 <li><strong>cold input jitter</strong>. The variance among separate measurements of cold input latency values.</li>
2265 <li><strong>continuous round-trip latency</strong>. The sum of continuous input latency plus continuous output latency plus 5
2266milliseconds.</li>
2267 <li><strong>OpenSL ES PCM buffer queue API</strong>. The set of PCM-related OpenSL ES APIs within Android NDK; see
2268NDK_root/docs/opensles/index.html.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2269</ul>
2270
2271<p>Device implementations that declare android.hardware.audio.output SHOULD meet
2272or exceed these audio output requirements:</p>
2273
2274<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2275 <li>cold output latency of 100 milliseconds or less</li>
2276 <li>continuous output latency of 45 milliseconds or less</li>
2277 <li>minimize the cold output jitter</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2278</ul>
2279
2280<p>If a device implementation meets the requirements of this section after any
2281initial calibration when using the OpenSL ES PCM buffer queue API, for
2282continuous output latency and cold output latency over at least one supported
2283audio output device, it MAY report support for low-latency audio, by reporting
2284the feature android.hardware.audio.low_latency via the
2285android.content.pm.PackageManager class [<a href="http://developer.android.com/reference/android/content/pm/PackageManager.html">Resources, 53</a>]. Conversely, if the device implementation does not meet these requirements it
2286MUST NOT report support for low-latency audio.</p>
2287
2288<p>Device implementations that include android.hardware.microphone SHOULD meet
2289these input audio requirements:</p>
2290
2291<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2292 <li>cold input latency of 100 milliseconds or less</li>
2293 <li>continuous input latency of 30 milliseconds or less</li>
2294 <li>continuous round-trip latency of 50 milliseconds or less</li>
2295 <li>minimize the cold input jitter</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2296</ul>
2297
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2298<h2 id="5_7_network_protocols">5.7. Network Protocols</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2299
2300
2301<p>Devices MUST support the media network protocols for audio and video playback
2302as specified in the Android SDK documentation [<a href="http://developer.android.com/guide/appendix/media-formats.html">Resources, 50</a>]. Specifically, devices MUST support the following media network protocols:</p>
2303
2304<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2305 <li>RTSP (RTP, SDP)</li>
2306 <li>HTTP(S) progressive streaming</li>
2307 <li>HTTP(S) Live Streaming draft protocol, Version 3 [<a href="http://tools.ietf.org/html/draft-pantos-http-live-streaming-03">Resources, 54</a>]</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2308</ul>
2309
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2310<h2 id="5_8_secure_media">5.8. Secure Media</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2311
2312
2313<p>Device implementations that support secure video output and are capable of
2314supporting secure surfaces MUST declare support for Display.FLAG_SECURE. Device
2315implementations that declare support for Display.FLAG_SECURE, if they support a
2316wireless display protocol, MUST secure the link with a cryptographically strong
2317mechanism such as HDCP 2.x or higher for Miracast wireless displays. Similarly
2318if they support a wired external display, the device implementations MUST
2319support HDCP 1.2 or higher. Android Television device implementations MUST
2320support HDCP 2.2 for devices supporting 4K resolution and HDCP 1.4 or above for
2321lower resolutions. The upstream Android open source implementation includes
2322support for wireless (Miracast) and wired (HDMI) displays that satisfies this
2323requirement.</p>
2324
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2325<h1 id="6_developer_tools_and_options_compatibility">6. Developer Tools and Options Compatibility</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2326
2327
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2328<h2 id="6_1_developer_tools">6.1. Developer Tools</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2329
2330
2331<p>Device implementations MUST support the Android Developer Tools provided in the
2332Android SDK. Android compatible devices MUST be compatible with:</p>
2333
2334<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2335 <li><strong>Android Debug Bridge (adb)</strong> [<a href="http://developer.android.com/tools/help/adb.html">Resources, 55</a>]</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2336</ul>
2337
2338<p>Device implementations MUST support all adb functions as documented in the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2339Android SDK including dumpsys [<a href="https://source.android.com/devices/input/diagnostics.html">Resources, 56</a>]. The device-side adb daemon MUST be inactive by default and there MUST be a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2340user-accessible mechanism to turn on the Android Debug Bridge. If a device
2341implementation omits USB peripheral mode, it MUST implement the Android Debug
2342Bridge via local-area network (such as Ethernet or 802.11). </p>
2343
2344<p>Android includes support for secure adb. Secure adb enables adb on known
2345authenticated hosts. Device implementations MUST support secure adb.</p>
2346
2347<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2348 <li><strong>Dalvik Debug Monitor Service (ddms)</strong> [<a href="http://developer.android.com/tools/debugging/ddms.html">Resources, 57</a>]</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2349</ul>
2350
2351<p>Device implementations MUST support all ddms features as documented in the
2352Android SDK. As ddms uses adb, support for ddms SHOULD be inactive by default,
2353but MUST be supported whenever the user has activated the Android Debug Bridge,
2354as above.</p>
2355
2356<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2357 <li><strong>Monkey</strong> [<a href="http://developer.android.com/tools/help/monkey.html">Resources, 58</a>]</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2358</ul>
2359
2360<p>Device implementations MUST include the Monkey framework, and make it available
2361for applications to use.</p>
2362
2363<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2364 <li><strong>SysTrace</strong> [<a href="http://developer.android.com/tools/help/systrace.html">Resources, 59</a>]</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2365</ul>
2366
2367<p>Device implementations MUST support systrace tool as documented in the Android
2368SDK. Systrace must be inactive by default, and there MUST be a user-accessible
2369mechanism to turn on Systrace.</p>
2370
2371<p>Most Linux-based systems and Apple Macintosh systems recognize Android devices
2372using the standard Android SDK tools, without additional support; however
2373Microsoft Windows systems typically require a driver for new Android devices.
2374(For instance, new vendor IDs and sometimes new device IDs require custom USB
2375drivers for Windows systems.) If a device implementation is unrecognized by the
2376adb tool as provided in the standard Android SDK, device implementers MUST
2377provide Windows drivers allowing developers to connect to the device using the
2378adb protocol. These drivers MUST be provided for Windows XP, Windows Vista,
2379Windows 7, Windows 8, and Windows 9 in both 32-bit and 64-bit versions.</p>
2380
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2381<h2 id="6_2_developer_options">6.2. Developer Options</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2382
2383
2384<p>Android includes support for developers to configure application
2385development-related settings. Device implementations MUST honor the
2386android.settings.APPLICATION_DEVELOPMENT_SETTINGS intent to show application
2387development-related settings [<a href="http://developer.android.com/reference/android/provider/Settings.html#ACTION_APPLICATION_DEVELOPMENT_SETTINGS">Resources, 60</a>]. The upstream Android implementation hides the Developer Options menu by
2388default and enables users to launch Developer Options after pressing seven (7)
2389times on the <strong>Settings</strong> > <strong>About Device</strong> > <strong>Build Number</strong> menu item. Device implementations MUST provide a consistent experience for
2390Developer Options. Specifically, device implementations MUST hide Developer
2391Options by default and MUST provide a mechanism to enable Developer Options
2392that is consistent with the upstream Android implementation.</p>
2393
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2394<h1 id="7_hardware_compatibility">7. Hardware Compatibility</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2395
2396
2397<p>If a device includes a particular hardware component that has a corresponding
2398API for third-party developers, the device implementation MUST implement that
2399API as described in the Android SDK documentation. If an API in the SDK
2400interacts with a hardware component that is stated to be optional and the
2401device implementation does not possess that component:</p>
2402
2403<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2404 <li>Complete class definitions (as documented by the SDK) for the component APIs
2405MUST still be presented.
2406 <li>The API&rsquo;s behaviors MUST be implemented as no-ops in some reasonable fashion.
2407 <li>API methods MUST return null values where permitted by the SDK documentation.
2408 <li>API methods MUST return no-op implementations of classes where null values are
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2409not permitted by the SDK documentation.
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2410 <li>API methods MUST NOT throw exceptions not documented by the SDK documentation.
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2411</ul>
2412
2413<p>A typical example of a scenario where these requirements apply is the telephony
2414API: even on non-phone devices, these APIs must be implemented as reasonable
2415no-ops.</p>
2416
2417<p>Device implementations MUST consistently report accurate hardware configuration
2418information via the getSystemAvailableFeatures() and hasSystemFeature(String)
2419methods on the android.content.pm.PackageManager class for the same build
2420fingerprint. [<a href="http://developer.android.com/reference/android/content/pm/PackageManager.html">Resources, 53]</a></p>
2421
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2422<h2 id="7_1_display_and_graphics">7.1. Display and Graphics</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2423
2424
2425<p>Android includes facilities that automatically adjust application assets and UI
2426layouts appropriately for the device, to ensure that third-party applications
2427run well on a variety of hardware configurations [<a href="http://developer.android.com/guide/practices/screens_support.html">Resources, 61</a>]. Devices MUST properly implement these APIs and behaviors, as detailed in
2428this section.</p>
2429
2430<p>The units referenced by the requirements in this section are defined as
2431follows:</p>
2432
2433<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2434 <li><strong>physical diagonal size</strong>. The distance in inches between two opposing corners of the illuminated portion
2435of the display.</li>
2436 <li><strong>dots per inch (dpi)</strong>. The number of pixels encompassed by a linear horizontal or vertical span of
24371&rdquo;. Where dpi values are listed, both horizontal and vertical dpi must fall
2438within the range.</li>
2439 <li><strong>aspect ratio</strong>. The ratio of the longer dimension of the screen to the shorter dimension. For
2440example, a display of 480x854 pixels would be 854/480 = 1.779, or roughly &ldquo;16:9&rdquo;.</li>
2441 <li><strong>density-independent pixel (dp)</strong> The virtual pixel unit normalized to a 160 dpi screen, calculated as: pixels =
2442dps * (density/160).</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2443</ul>
2444
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2445<h3 id="7_1_1_screen_configuration">7.1.1. Screen Configuration</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2446
2447
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2448<h4 id="7_1_1_1_screen_size">7.1.1.1. Screen Size</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2449
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2450<div class="note">
2451<p>Android Watch devices (detailed in <a href="#2_device_types">section 2</a>) MAY have smaller screen sizes as described in this section.</p>
2452</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2453
2454<p>The Android UI framework supports a variety of different screen sizes, and
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2455allows applications to query the device screen size (aka &ldquo;screen layout") via
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2456android.content.res.Configuration.screenLayout with the SCREENLAYOUT_SIZE_MASK.
2457Device implementations MUST report the correct screen size as defined in the
2458Android SDK documentation [<a href="http://developer.android.com/guide/practices/screens_support.html">Resources, 61</a>] and determined by the upstream Android platform. Specifically, device
2459implementations MUST report the correct screen size according to the following
2460logical density-independent pixel (dp) screen dimensions.</p>
2461
2462<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2463 <li>Devices MUST have screen sizes of at least 426 dp x 320 dp (&lsquo;small&rsquo;), unless it
2464is an Android Watch device.</li>
2465 <li>Devices that report screen size &lsquo;normal&rsquo; MUST have screen sizes of at least 480
2466dp x 320 dp.</li>
2467 <li>Devices that report screen size &lsquo;large&rsquo; MUST have screen sizes of at least 640
2468dp x 480 dp.</li>
2469 <li>Devices that report screen size &lsquo;xlarge&rsquo; MUST have screen sizes of at least 960
2470dp x 720 dp.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2471</ul>
2472
2473<p>In addition, </p>
2474
2475<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2476 <li>Android Watch devices MUST have a screen with the physical diagonal size in the
2477range from 1.1 to 2.5 inches.</li>
2478 <li>Other types of Android device implementations, with a physically integrated
2479screen, MUST have a screen at least 2.5 inches in physical diagonal size.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2480</ul>
2481
2482<p>Devices MUST NOT change their reported screen size at any time.</p>
2483
2484<p>Applications optionally indicate which screen sizes they support via the
2485<supports-screens> attribute in the AndroidManifest.xml file. Device
2486implementations MUST correctly honor applications' stated support for small,
2487normal, large, and xlarge screens, as described in the Android SDK
2488documentation.</p>
2489
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2490<h4 id="7_1_1_2_screen_aspect_ratio">7.1.1.2. Screen Aspect Ratio</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2491
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2492<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2493<p>Android Watch devices MAY have an aspect ratio of 1.0 (1:1).</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2494</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2495
2496
2497<p>The screen aspect ratio MUST be a value from 1.3333 (4:3) to 1.86 (roughly
249816:9), but Android Watch devices MAY have an aspect ratio of 1.0 (1:1) because
2499such a device implementation will use a UI_MODE_TYPE_WATCH as the
2500android.content.res.Configuration.uiMode.</p>
2501
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2502<h4 id="7_1_1_3_screen_density">7.1.1.3. Screen Density</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2503
2504
2505<p>The Android UI framework defines a set of standard logical densities to help
2506application developers target application resources. Device implementations
2507MUST report only one of the following logical Android framework densities
2508through the android.util.DisplayMetrics APIs, and MUST execute applications at
2509this standard density and MUST NOT change the value at at any time for the
2510default display.</p>
2511
2512<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2513 <li>120 dpi (ldpi)</li>
2514 <li>160 dpi (mdpi)</li>
2515 <li>213 dpi (tvdpi)</li>
2516 <li>240 dpi (hdpi)</li>
2517 <li>280 dpi (280dpi)</li>
2518 <li>320 dpi (xhdpi)</li>
2519 <li>400 dpi (400dpi)</li>
2520 <li>480 dpi (xxhdpi)</li>
2521 <li>560 dpi (560dpi)</li>
2522 <li>640 dpi (xxxhdpi)</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2523</ul>
2524
2525<p>Device implementations SHOULD define the standard Android framework density
2526that is numerically closest to the physical density of the screen, unless that
2527logical density pushes the reported screen size below the minimum supported. If
2528the standard Android framework density that is numerically closest to the
2529physical density results in a screen size that is smaller than the smallest
2530supported compatible screen size (320 dp width), device implementations SHOULD
2531report the next lowest standard Android framework density.</p>
2532
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2533<h3 id="7_1_2_display_metrics">7.1.2. Display Metrics</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2534
2535
2536<p>Device implementations MUST report correct values for all display metrics
2537defined in android.util.DisplayMetrics [<a href="http://developer.android.com/reference/android/util/DisplayMetrics.html">Resources, 62</a>] and MUST report the same values regardless of whether the embedded or
2538external screen is used as the default display.</p>
2539
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2540<h3 id="7_1_3_screen_orientation">7.1.3. Screen Orientation</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2541
2542
2543<p>Devices MUST report which screen orientations they support
2544(android.hardware.screen.portrait and/or android.hardware.screen.landscape) and
2545MUST report at least one supported orientation. For example, a device with a
2546fixed orientation landscape screen, such as a television or laptop, SHOULD only
2547report android.hardware.screen.landscape.</p>
2548
2549<p>Devices that report both screen orientations MUST support dynamic orientation
2550by applications to either portrait or landscape screen orientation. That is,
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2551the device must respect the application&rsquo;s request for a specific screen
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2552orientation. Device implementations MAY select either portrait or landscape
2553orientation as the default.</p>
2554
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2555<p>Devices MUST report the correct value for the device&rsquo;s current orientation,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2556whenever queried via the android.content.res.Configuration.orientation,
2557android.view.Display.getOrientation(), or other APIs.</p>
2558
2559<p>Devices MUST NOT change the reported screen size or density when changing
2560orientation.</p>
2561
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2562<h3 id="7_1_4_2d_and_3d_graphics_acceleration">7.1.4. 2D and 3D Graphics Acceleration</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2563
2564
2565<p>Device implementations MUST support both OpenGL ES 1.0 and 2.0, as embodied and
2566detailed in the Android SDK documentations. Device implementations SHOULD
2567support OpenGL ES 3.0 or 3.1 on devices capable of supporting it. Device
2568implementations MUST also support Android RenderScript, as detailed in the
2569Android SDK documentation [<a href="http://developer.android.com/guide/topics/renderscript/">Resources, 63</a>].</p>
2570
2571<p>Device implementations MUST also correctly identify themselves as supporting
2572OpenGL ES 1.0, OpenGL ES 2.0, OpenGL ES 3.0 or OpenGL 3.1. That is:</p>
2573
2574<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2575 <li>The managed APIs (such as via the GLES10.getString()method MUST report support
2576for OpenGL ES 1.0 and OpenGL ES 2.0.</li>
2577 <li>The native C/C++ OpenGL APIs (APIs available to apps via libGLES_v1CM.so,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2578libGLES_v2.so, or libEGL.so) MUST report support for OpenGL ES 1.0 and OpenGL
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2579ES 2.0.</li>
2580 <li>Device implementations that declare support for OpenGL ES 3.0 or 3.1 MUST
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2581support the corresponding managed APIs and include support for native C/C++
2582APIs. On device implementations that declare support for OpenGL ES 3.0 or 3.1,
2583libGLESv2.so MUST export the corresponding function symbols in addition to the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2584OpenGL ES 2.0 function symbols.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2585</ul>
2586
2587<p>In addition to OpenGL ES 3.1, Android provides an extension pack with Java
2588interfaces [<a href="https://developer.android.com/reference/android/opengl/GLES31Ext.html">Resources, 64</a>] and native support for advanced graphics functionality such as tessellation
2589and the ASTC texture compression format. Android device implementations MAY
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2590support this extension pack, and&mdash;only if fully implemented&mdash;MUST identify the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2591support through the android.hardware.opengles.aep feature flag.</p>
2592
2593<p>Also, device implementations MAY implement any desired OpenGL ES extensions.
2594However, device implementations MUST report via the OpenGL ES managed and
2595native APIs all extension strings that they do support, and conversely MUST NOT
2596report extension strings that they do not support.</p>
2597
2598<p>Note that Android includes support for applications to optionally specify that
2599they require specific OpenGL texture compression formats. These formats are
2600typically vendor-specific. Device implementations are not required by Android
2601to implement any specific texture compression format. However, they SHOULD
2602accurately report any texture compression formats that they do support, via the
2603getString() method in the OpenGL API.</p>
2604
2605<p>Android includes a mechanism for applications to declare that they want to
2606enable hardware acceleration for 2D graphics at the Application, Activity,
2607Window, or View level through the use of a manifest tag
2608android:hardwareAccelerated or direct API calls [<a href="http://developer.android.com/guide/topics/graphics/hardware-accel.html">Resources, 65</a>].</p>
2609
2610<p>Device implementations MUST enable hardware acceleration by default, and MUST
2611disable hardware acceleration if the developer so requests by setting
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2612android:hardwareAccelerated="false&rdquo; or disabling hardware acceleration directly
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2613through the Android View APIs.</p>
2614
2615<p>In addition, device implementations MUST exhibit behavior consistent with the
2616Android SDK documentation on hardware acceleration [<a href="http://developer.android.com/guide/topics/graphics/hardware-accel.html">Resources, 65</a>].</p>
2617
2618<p>Android includes a TextureView object that lets developers directly integrate
2619hardware-accelerated OpenGL ES textures as rendering targets in a UI hierarchy.
2620Device implementations MUST support the TextureView API, and MUST exhibit
2621consistent behavior with the upstream Android implementation.</p>
2622
2623<p>Android includes support for EGL_ANDROID_RECORDABLE, an EGLConfig attribute
2624that indicates whether the EGLConfig supports rendering to an ANativeWindow
2625that records images to a video. Device implementations MUST support
2626EGL_ANDROID_RECORDABLE extension [<a href="https://www.khronos.org/registry/egl/extensions/ANDROID/EGL_ANDROID_recordable.txt">Resources, 66</a>].</p>
2627
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2628<h3 id="7_1_5_legacy_application_compatibility_mode">7.1.5. Legacy Application Compatibility Mode</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2629
2630
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2631<p>Android specifies a &ldquo;compatibility mode&rdquo; in which the framework operates in a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2632'normal' screen size equivalent (320dp width) mode for the benefit of legacy
2633applications not developed for old versions of Android that pre-date
2634screen-size independence. Device implementations MUST include support for
2635legacy application compatibility mode as implemented by the upstream Android
2636open source code. That is, device implementations MUST NOT alter the triggers
2637or thresholds at which compatibility mode is activated, and MUST NOT alter the
2638behavior of the compatibility mode itself.</p>
2639
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2640<h3 id="7_1_6_screen_technology">7.1.6. Screen Technology</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2641
2642
2643<p>The Android platform includes APIs that allow applications to render rich
2644graphics to the display. Devices MUST support all of these APIs as defined by
2645the Android SDK unless specifically allowed in this document. </p>
2646
2647<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2648 <li>Devices MUST support displays capable of rendering 16-bit color graphics and
2649SHOULD support displays capable of 24-bit color graphics.</li>
2650 <li>Devices MUST support displays capable of rendering animations.</li>
2651 <li>The display technology used MUST have a pixel aspect ratio (PAR) between 0.9
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2652and 1.15. That is, the pixel aspect ratio MUST be near square (1.0) with a 10 ~
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]265315% tolerance.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2654</ul>
2655
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2656<h3 id="7_1_7_external_displays">7.1.7. External Displays</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2657
2658
2659<p>Android includes support for secondary display to enable media sharing
2660capabilities and developer APIs for accessing external displays. If a device
2661supports an external display either via a wired, wireless, or an embedded
2662additional display connection then the device implementation MUST implement the
2663display manager API as described in the Android SDK documentation [<a href="http://developer.android.com/reference/android/hardware/display/DisplayManager.html">Resources, 67</a>].</p>
2664
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2665<h2 id="7_2_input_devices">7.2. Input Devices</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2666
Heidi von Markham43b1cc72015-04-02 16:04:43 -0700[diff] [blame]2667<p>Devices MUST support a touchscreen or meet the requirements listed in 7.2.2
2668for non-touch navigation.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2669
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2670<h3 id="7_2_1_keyboard">7.2.1. Keyboard</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2671
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2672<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2673<p>Android Watch devices MAY but other type of device implementations MUST
2674implement a soft keyboard.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2675</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2676
2677
2678<p>Device implementations:</p>
2679
2680<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2681 <li>MUST include support for the Input Management Framework (which allows
2682third-party developers to create Input Method Editors&mdash;i.e. soft keyboard) as
2683detailed at <a href="http://developer.android.com">http://developer.android.com</a>.</li>
2684 <li>MUST provide at least one soft keyboard implementation (regardless of whether a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2685hard keyboard is present) except for Android Watch devices where the screen
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2686size makes it less reasonable to have a soft keyboard.</li>
2687 <li>MAY include additional soft keyboard implementations.</li>
2688 <li>MAY include a hardware keyboard.</li>
2689 <li>MUST NOT include a hardware keyboard that does not match one of the formats
2690specified in android.content.res.Configuration.keyboard [<a href="http://developer.android.com/reference/android/content/res/Configuration.html">Resources, 68</a>] (QWERTY or 12-key).</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2691</ul>
2692
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2693<h3 id="7_2_2_non-touch_navigation">7.2.2. Non-touch Navigation</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2694
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2695<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2696<p>Android Television devices MUST support D-pad.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2697</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2698
2699<p>Device implementations:</p>
2700
2701<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2702 <li>MAY omit a non-touch navigation option (trackball, d-pad, or wheel) if the
2703device implementation is not an Android Television device.</li>
2704 <li>MUST report the correct value for android.content.res.Configuration.navigation
2705[<a href="http://developer.android.com/reference/android/content/res/Configuration.html">Resources, 68</a>].</li>
2706 <li>MUST provide a reasonable alternative user interface mechanism for the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2707selection and editing of text, compatible with Input Management Engines. The
2708upstream Android open source implementation includes a selection mechanism
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2709suitable for use with devices that lack non-touch navigation inputs.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2710</ul>
2711
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2712<h3 id="7_2_3_navigation_keys">7.2.3. Navigation Keys</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2713
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2714<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2715<p>The availability and visibility requirement of the Home, Recents, and Back
2716functions differ between device types as described in this section.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2717</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2718
2719<p>The Home, Recents, and Back functions (mapped to the key events KEYCODE_HOME,
2720KEYCODE_APP_SWITCH, KEYCODE_BACK, respectively) are essential to the Android
2721navigation paradigm and therefore;</p>
2722
2723<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2724 <li>Android Handheld device implementations MUST provide the Home, Recents, and
2725Back functions.</li>
2726 <li>Android Television device implementations MUST provide the Home and Back
2727functions.</li>
2728 <li>Android Watch device implementations MUST have the Home function available to
2729the user, and the Back function except for when it is in UI_MODE_TYPE_WATCH.</li>
2730 <li>All other types of device implementations MUST provide the Home and Back
2731functions.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2732</ul>
2733
2734<p>These functions MAY be implemented via dedicated physical buttons (such as
2735mechanical or capacitive touch buttons), or MAY be implemented using dedicated
2736software keys on a distinct portion of the screen, gestures, touch panel, etc.
2737Android supports both implementations. All of these functions MUST be
2738accessible with a single action (e.g. tap, double-click or gesture) when
2739visible.</p>
2740
2741<p>Recents function, if provided, MUST have a visible button or icon unless hidden
2742together with other navigation functions in full-screen mode. This does not
2743apply to devices upgrading from earlier Android versions that have physical
2744buttons for navigation and no recents key.</p>
2745
2746<p> The Home and Back functions, if provided, MUST each have a visible button or
2747icon unless hidden together with other navigation functions in full-screen mode
2748or when the uiMode UI_MODE_TYPE_MASK is set to UI_MODE_TYPE_WATCH.</p>
2749
2750<p>The Menu function is deprecated in favor of action bar since Android 4.0.
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]2751Therefore the new device implementations shipping with Android 5.0 and later MUST NOT
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2752implement a dedicated physical button for the Menu function. Older device
2753implementations SHOULD NOT implement a dedicated physical button for the Menu
2754function, but if the physical Menu button is implemented and the device is
2755running applications with targetSdkVersion > 10, the device implementation:</p>
2756
2757<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2758 <li>MUST display the action overflow button on the action bar when it is visible
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2759and the resulting action overflow menu popup is not empty. For a device
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]2760implementation launched before Android 4.4 but upgrading to Android 5.1, this
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2761is RECOMMENDED.</li>
2762 <li>MUST NOT modify the position of the action overflow popup displayed by
2763selecting the overflow button in the action bar.</li>
2764 <li>MAY render the action overflow popup at a modified position on the screen when
2765it is displayed by selecting the physical menu button.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2766</ul>
2767
2768<p>For backwards compatibility, device implementations MUST make the Menu function
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2769available to applications when targetSdkVersion is less than 10, either by a physical
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2770button, a software key, or gestures. This Menu function should be presented
2771unless hidden together with other navigation functions.</p>
2772
2773<p>Android supports Assist action [<a href="http://developer.android.com/reference/android/content/Intent.html#ACTION_ASSIST">Resources, 69</a>]. Android device implementations except for Android Watch devices MUST make
2774the Assist action available to the user at all times when running applications.
2775The Assist action SHOULD be implemented as a long-press on the Home button or a
2776swipe-up gesture on the software Home key. This function MAY be implemented via
2777another physical button, software key, or gesture, but MUST be accessible with
2778a single action (e.g. tap, double-click, or gesture) when other navigation keys
2779are visible.</p>
2780
2781<p>Device implementations MAY use a distinct portion of the screen to display the
2782navigation keys, but if so, MUST meet these requirements:</p>
2783
2784<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2785 <li>Device implementation navigation keys MUST use a distinct portion of the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2786screen, not available to applications, and MUST NOT obscure or otherwise
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2787interfere with the portion of the screen available to applications.</li>
2788 <li>Device implementations MUST make available a portion of the display to
2789applications that meets the requirements defined in <a href="#7_1_1_screen_configuration">section 7.1.1</a>.</li>
2790 <li>Device implementations MUST display the navigation keys when applications do
2791not specify a system UI mode, or specify SYSTEM_UI_FLAG_VISIBLE.</li>
2792 <li>Device implementations MUST present the navigation keys in an unobtrusive &ldquo;low
2793profile&rdquo; (eg. dimmed) mode when applications specify
2794SYSTEM_UI_FLAG_LOW_PROFILE.</li>
2795 <li>Device implementations MUST hide the navigation keys when applications specify
2796SYSTEM_UI_FLAG_HIDE_NAVIGATION.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2797</ul>
2798
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2799<h3 id="7_2_4_touchscreen_input">7.2.4. Touchscreen Input</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2800
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2801<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2802<p>Android Handhelds and Watch Devices MUST support touchscreen input.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2803</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2804
2805
2806<p>Device implementations SHOULD have a pointer input system of some kind (either
2807mouse-like or touch). However, if a device implementation does not support a
2808pointer input system, it MUST NOT report the android.hardware.touchscreen or
2809android.hardware.faketouch feature constant. Device implementations that do
2810include a pointer input system:</p>
2811
2812<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2813 <li>SHOULD support fully independently tracked pointers, if the device input system
2814supports multiple pointers.</li>
2815 <li>MUST report the value of android.content.res.Configuration.touchscreen [<a href="http://developer.android.com/reference/android/content/res/Configuration.html">Resources, 68</a>] corresponding to the type of the specific touchscreen on the device.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2816</ul>
2817
2818<p>Android includes support for a variety of touchscreens, touch pads, and fake
2819touch input devices. Touchscreen based device implementations are associated
2820with a display [<a href="http://source.android.com/devices/tech/input/touch-devices.html">Resources, 70</a>] such that the user has the impression of directly manipulating items on
2821screen. Since the user is directly touching the screen, the system does not
2822require any additional affordances to indicate the objects being manipulated.
2823In contrast, a fake touch interface provides a user input system that
2824approximates a subset of touchscreen capabilities. For example, a mouse or
2825remote control that drives an on-screen cursor approximates touch, but requires
2826the user to first point or focus then click. Numerous input devices like the
2827mouse, trackpad, gyro-based air mouse, gyro-pointer, joystick, and multi-touch
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]2828trackpad can support fake touch interactions. Android includes the feature
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2829constant android.hardware.faketouch, which corresponds to a high-fidelity
2830non-touch (pointer-based) input device such as a mouse or trackpad that can
2831adequately emulate touch-based input (including basic gesture support), and
2832indicates that the device supports an emulated subset of touchscreen
2833functionality. Device implementations that declare the fake touch feature MUST
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2834meet the fake touch requirements in <a href="#7_2_5_fake_touch_input">section 7.2.5</a>.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2835
2836<p>Device implementations MUST report the correct feature corresponding to the
2837type of input used. Device implementations that include a touchscreen
2838(single-touch or better) MUST report the platform feature constant
2839android.hardware.touchscreen. Device implementations that report the platform
2840feature constant android.hardware.touchscreen MUST also report the platform
2841feature constant android.hardware.faketouch. Device implementations that do not
2842include a touchscreen (and rely on a pointer device only) MUST NOT report any
2843touchscreen feature, and MUST report only android.hardware.faketouch if they
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2844meet the fake touch requirements in <a href="#7_2_5_fake_touch_input">section 7.2.5</a>.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2845
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2846<h3 id="7_2_5_fake_touch_input">7.2.5. Fake Touch Input</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2847
2848
2849<p>Device implementations that declare support for android.hardware.faketouch:</p>
2850
2851<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2852 <li>MUST report the absolute X and Y screen positions of the pointer location and
2853display a visual pointer on the screen [<a href="http://developer.android.com/reference/android/view/MotionEvent.html">Resources, 71</a>].</li>
2854 <li>MUST report touch event with the action code that specifies the state change
2855that occurs on the pointer going down or up on the screen [<a href="http://developer.android.com/reference/android/view/MotionEvent.html">Resources, 71</a>].</li>
2856 <li>MUST support pointer down and up on an object on the screen, which allows users
2857to emulate tap on an object on the screen.</li>
2858 <li>MUST support pointer down, pointer up, pointer down then pointer up in the same
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2859place on an object on the screen within a time threshold, which allows users to
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2860emulate double tap on an object on the screen [<a href="http://developer.android.com/reference/android/view/MotionEvent.html">Resources, 71</a>].</li>
2861 <li>MUST support pointer down on an arbitrary point on the screen, pointer move to
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2862any other arbitrary point on the screen, followed by a pointer up, which allows
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2863users to emulate a touch drag.</li>
2864 <li>MUST support pointer down then allow users to quickly move the object to a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2865different position on the screen and then pointer up on the screen, which
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2866allows users to fling an object on the screen.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2867</ul>
2868
2869<p>Devices that declare support for android.hardware.faketouch.multitouch.distinct
2870MUST meet the requirements for faketouch above, and MUST also support distinct
2871tracking of two or more independent pointer inputs.</p>
2872
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2873<h3 id="7_2_6_game_controller_support">7.2.6. Game Controller Support</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2874
2875
2876<p>Android Television device implementations MUST support button mappings for game
2877controllers as listed below. The upstream Android implementation includes
2878implementation for game controllers that satisfies this requirement. </p>
2879
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2880<h4 id="7_2_6_1_button_mappings">7.2.6.1. Button Mappings</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2881
2882
2883<p>Android Television device implementations MUST support the following key
2884mappings:</p>
2885<table>
2886 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2887 <th>Button</th>
2888 <th>HID Usage</strong><sup>2</sup></td>
2889 <th>Android Button</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2890 </tr>
2891 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2892 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_A">A</a><sup>1</sup></td>
2893 <td>0x09 0x0001</td>
2894 <td>KEYCODE_BUTTON_A (96)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2895 </tr>
2896 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2897 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_B">B</a><sup>1</sup></td>
2898 <td>0x09 0x0002</td>
2899 <td>KEYCODE_BUTTON_B (97)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2900 </tr>
2901 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2902 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_X">X</a><sup>1</sup></td>
2903 <td>0x09 0x0004</td>
2904 <td>KEYCODE_BUTTON_X (99)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2905 </tr>
2906 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2907 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_Y">Y</a><sup>1</sup></td>
2908 <td>0x09 0x0005</td>
2909 <td>KEYCODE_BUTTON_Y (100)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2910 </tr>
2911 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2912 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_DPAD_UP">D-pad up</a><sup>1</sup></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2913
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2914<p><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_DPAD_DOWN">D-pad down</a><sup>1</sup></td>
2915 <td>0x01 0x00393</td>
2916 <td><a href="http://developer.android.com/reference/android/view/MotionEvent.html#AXIS_HAT_Y">AXIS_HAT_Y</a><sup>4</sup></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2917 </tr>
2918 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2919 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_DPAD_LEFT">D-pad left</a>1</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2920
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2921<p><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_DPAD_RIGHT">D-pad right</a><sup>1</sup></td>
2922 <td>0x01 0x00393</td>
2923 <td><a href="http://developer.android.com/reference/android/view/MotionEvent.html#AXIS_HAT_X">AXIS_HAT_X</a><sup>4</sup></td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2924 </tr>
2925 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2926 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_L1">Left shoulder button</a><sup>1</sup></td>
2927 <td>0x09 0x0007</td>
2928 <td>KEYCODE_BUTTON_L1 (102)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2929 </tr>
2930 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2931 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_R1">Right shoulder button</a><sup>1</sup></td>
2932 <td>0x09 0x0008</td>
2933 <td>KEYCODE_BUTTON_R1 (103)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2934 </tr>
2935 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2936 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_THUMBL">Left stick click</a><sup>1</sup></td>
2937 <td>0x09 0x000E</td>
2938 <td>KEYCODE_BUTTON_THUMBL (106)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2939 </tr>
2940 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2941 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BUTTON_THUMBR">Right stick click</a><sup>1</sup></td>
2942 <td>0x09 0x000F</td>
2943 <td>KEYCODE_BUTTON_THUMBR (107)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2944 </tr>
2945 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2946 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_HOME">Home</a><sup>1</sup></td>
2947 <td>0x0c 0x0223</td>
2948 <td>KEYCODE_HOME (3)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2949 </tr>
2950 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2951 <td><a href="http://developer.android.com/reference/android/view/KeyEvent.html#KEYCODE_BACK">Back</a><sup>1</sup></td>
2952 <td>0x0c 0x0224</td>
2953 <td>KEYCODE_BACK (4)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2954 </tr>
2955</table>
2956
2957
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2958<p class="table_footnote">1 [<a href="http://developer.android.com/reference/android/view/KeyEvent.html">Resources, 72</a>]</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2959
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2960<p class="table_footnote">2 The above HID usages must be declared within a Game pad CA (0x01 0x0005).</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2961
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2962<p class="table_footnote">3 This usage must have a Logical Minimum of 0, a Logical Maximum of 7, a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2963Physical Minimum of 0, a Physical Maximum of 315, Units in Degrees, and a
2964Report Size of 4. The logical value is defined to be the clockwise rotation
2965away from the vertical axis; for example, a logical value of 0 represents no
2966rotation and the up button being pressed, while a logical value of 1 represents
2967a rotation of 45 degrees and both the up and left keys being pressed.</p>
2968
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2969<p class="table_footnote">4 [<a href="http://developer.android.com/reference/android/view/MotionEvent.html">Resources, 71</a>]</p>
2970
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2971<table>
2972 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2973 <th>Analog Controls</strong><sup>1</sup></td>
2974 <th>HID Usage</th>
2975 <th>Android Button</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2976 </tr>
2977 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2978 <td><a href="http://developer.android.com/reference/android/view/MotionEvent.html#AXIS_LTRIGGER">Left Trigger</a></td>
2979 <td>0x02 0x00C5</td>
2980 <td>AXIS_LTRIGGER </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2981 </tr>
2982 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2983 <td><a href="http://developer.android.com/reference/android/view/MotionEvent.html#AXIS_THROTTLE">Right Trigger</a></td>
2984 <td>0x02 0x00C4</td>
2985 <td>AXIS_RTRIGGER </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2986 </tr>
2987 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2988 <td><a href="http://developer.android.com/reference/android/view/MotionEvent.html#AXIS_Y">Left Joystick</a></td>
2989 <td>0x01 0x0030</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2990
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2991<p>0x01 0x0031</td>
2992 <td>AXIS_X</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2993
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2994<p>AXIS_Y</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2995 </tr>
2996 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]2997 <td><a href="http://developer.android.com/reference/android/view/MotionEvent.html#AXIS_Z">Right Joystick</a></td>
2998 <td>0x01 0x0032</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]2999
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3000<p>0x01 0x0035</td>
3001 <td>AXIS_Z</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3002
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3003<p>AXIS_RZ</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3004 </tr>
3005</table>
3006
3007
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3008<p class="table_footnote">1 [<a href="http://developer.android.com/reference/android/view/MotionEvent.html">Resources, 71</a>]</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3009
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3010<h3 id="7_2_7_remote_control">7.2.7. Remote Control</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3011
3012
3013<p>Android Television device implementations SHOULD provide a remote control to
3014allow users to access the TV interface. The remote control MAY be a physical
3015remote or can be a software-based remote that is accessible from a mobile phone
3016or tablet. The remote control MUST meet the requirements defined below.</p>
3017
3018<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3019 <li><strong>Search affordance</strong>. Device implementations MUST fire KEYCODE_SEARCH when the user invokes voice search either on the physical or software-based remote.</li>
3020 <li><strong>Navigation</strong>. All Android Television remotes MUST include Back, Home, and Select buttons and
3021support for D-pad events [<a href="http://developer.android.com/reference/android/view/KeyEvent.html">Resources, 72</a>].</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3022</ul>
3023
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3024<h2 id="7_3_sensors">7.3. Sensors</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3025
3026
3027<p>Android includes APIs for accessing a variety of sensor types. Devices
3028implementations generally MAY omit these sensors, as provided for in the
3029following subsections. If a device includes a particular sensor type that has a
3030corresponding API for third-party developers, the device implementation MUST
3031implement that API as described in the Android SDK documentation and the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3032Android Open Source documentation on sensors [<a href="http://source.android.com/devices/sensors/">Resources, 73</a>]. For example, device implementations:</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3033
3034<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3035 <li>MUST accurately report the presence or absence of sensors per the
3036android.content.pm.PackageManager class [<a href="http://developer.android.com/reference/android/content/pm/PackageManager.html">Resources, 53]</a>.</li>
3037 <li>MUST return an accurate list of supported sensors via the
3038SensorManager.getSensorList() and similar methods.</li>
3039 <li>MUST behave reasonably for all other sensor APIs (for example, by returning
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3040true or false as appropriate when applications attempt to register listeners,
3041not calling sensor listeners when the corresponding sensors are not present;
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3042etc.).</li>
3043 <li>MUST report all sensor measurements using the relevant International System of
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3044Units (metric) values for each sensor type as defined in the Android SDK
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3045documentation [<a href="http://developer.android.com/reference/android/hardware/SensorEvent.html">Resources, 74</a>].</li>
3046 <li>SHOULD report the event time in nanoseconds as defined in the Android SDK
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3047documentation, representing the time the event happened and synchronized with
3048the SystemClock.elapsedRealtimeNano() clock. Existing and new Android devices
3049are <strong>very strongly encouraged</strong> to meet these requirement so they will be able to upgrade to the future
3050platform releases where this might become a REQUIRED component. The
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3051synchronization error SHOULD be below 100 milliseconds [<a href="http://developer.android.com/reference/android/hardware/SensorEvent.html#timestamp">Resources, 75</a>].</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3052</ul>
3053
3054<p>The list above is not comprehensive; the documented behavior of the Android SDK
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3055and the Android Open Source Documentations on Sensors [<a href="http://source.android.com/devices/sensors/">Resources, 73</a>] is to be considered authoritative.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3056
3057<p>Some sensor types are composite, meaning they can be derived from data provided
3058by one or more other sensors. (Examples include the orientation sensor, and the
3059linear acceleration sensor.) Device implementations SHOULD implement these
3060sensor types, when they include the prerequisite physical sensors as described
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3061in [<a href="https://source.android.com/devices/sensors/sensor-types.html">Resources, 76</a>].
3062If a device implementation includes a composite sensor it MUST implement the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3063sensor as described in the Android Open Source documentation on composite
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3064sensors [<a href="https://source.android.com/devices/sensors/sensor-types.html#composite_sensor_type_summary">Resources, 76</a>].</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3065
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3066<p>Some Android sensors support a &ldquo;continuous&rdquo; trigger mode, which returns data
3067continuously [<a href="https://source.android.com/devices/sensors/report-modes.html#continuous">Resources, 77</a>]. For any API indicated by the Android SDK documentation to be a continuous
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3068sensor, device implementations MUST continuously provide periodic data samples
3069that SHOULD have a jitter below 3%, where jitter is defined as the standard
3070deviation of the difference of the reported timestamp values between
3071consecutive events.</p>
3072
3073<p>Note that the device implementations MUST ensure that the sensor event stream
3074MUST NOT prevent the device CPU from entering a suspend state or waking up from
3075a suspend state.</p>
3076
3077<p>Finally, when several sensors are activated, the power consumption SHOULD NOT
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3078exceed the sum of the individual sensor&rsquo;s reported power consumption.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3079
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3080<h3 id="7_3_1_accelerometer">7.3.1. Accelerometer</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3081
3082
3083<p>Device implementations SHOULD include a 3-axis accelerometer. Android Handheld
3084devices and Android Watch devices are strongly encouraged to include this
3085sensor. If a device implementation does include a 3-axis accelerometer, it:</p>
3086
3087<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3088 <li>MUST implement and report TYPE_ACCELEROMETER sensor [<a href="http://developer.android.com/reference/android/hardware/Sensor.html#TYPE_ACCELEROMETER">Resources, 78</a>].</li>
Unsuk Jung42630a32015-06-05 03:59:33 -0700[diff] [blame]3089 <li>MUST be able to report events up to a frequency of at least 50 Hz for
3090 Android Watch devices as such devices have a stricter power constraint and
3091 100 Hz for all other device types.</li>
3092 <li>SHOULD report events up to at least 200 Hz.</li>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3093 <li>MUST comply with the Android sensor coordinate system as detailed in the
3094Android APIs [<a href="http://developer.android.com/reference/android/hardware/SensorEvent.html">Resources, 74</a>].</li>
3095 <li>MUST be capable of measuring from freefall up to four times the gravity (4g) or
3096more on any axis.</li>
3097 <li>MUST have a resolution of at least 8-bits and SHOULD have a resolution of at
3098least 16-bits.</li>
3099 <li>SHOULD be calibrated while in use if the characteristics changes over the life
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3100cycle and compensated, and preserve the compensation parameters between device
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3101reboots.</li>
3102 <li>SHOULD be temperature compensated.</li>
3103 <li>MUST have a standard deviation no greater than 0.05 m/s^, where the standard
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3104deviation should be calculated on a per axis basis on samples collected over a
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3105period of at least 3 seconds at the fastest sampling rate.</li>
3106 <li>SHOULD implement the TYPE_SIGNIFICANT_MOTION, TYPE_TILT_DETECTOR,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3107TYPE_STEP_DETECTOR, TYPE_STEP_COUNTER composite sensors as described in the
3108Android SDK document. Existing and new Android devices are <strong>very strongly encouraged</strong> to implement the TYPE_SIGNIFICANT_MOTION composite sensor. If any of these
3109sensors are implemented, the sum of their power consumption MUST always be less
3110than 4 mW and SHOULD each be below 2 mW and 0.5 mW for when the device is in a
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3111dynamic or static condition.</li>
3112 <li>If a gyroscope sensor is included, MUST implement the TYPE_GRAVITY and
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3113TYPE_LINEAR_ACCELERATION composite sensors and SHOULD implement the
3114TYPE_GAME_ROTATION_VECTOR composite sensor. Existing and new Android devices
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3115are strongly encouraged to implement the TYPE_GAME_ROTATION_VECTOR sensor.</li>
3116 <li>SHOULD implement a TYPE_ROTATION_VECTOR composite sensor, if a gyroscope sensor
3117and a magnetometer sensor is also included.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3118</ul>
3119
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3120<h3 id="7_3_2_magnetometer">7.3.2. Magnetometer</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3121
3122
3123<p>Device implementations SHOULD include a 3-axis magnetometer (compass). If a
3124device does include a 3-axis magnetometer, it:</p>
3125
3126<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3127 <li>MUST implement the TYPE_MAGNETIC_FIELD sensor and SHOULD also implement
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3128TYPE_MAGNETIC_FIELD_UNCALIBRATED sensor. Existing and new Android devices are
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3129strongly encouraged to implement the TYPE_MAGNETIC_FIELD_UNCALIBRATED sensor.</li>
3130 <li>MUST be able to report events up to a frequency of at least 10 Hz and SHOULD
3131report events up to at least 50 Hz.</li>
3132 <li>MUST comply with the Android sensor coordinate system as detailed in the
3133Android APIs [<a href="http://developer.android.com/reference/android/hardware/SensorEvent.html">Resources, 74</a>].</li>
3134 <li>MUST be capable of measuring between -900 &micro;T and +900 &micro;T on each axis before
3135saturating.</li>
3136 <li>MUST have a hard iron offset value less than 700 &micro;T and SHOULD have a value
3137below 200 &micro;T, by placing the magnetometer far from dynamic (current-induced)
3138and static (magnet-induced) magnetic fields.</li>
3139 <li>MUST have a resolution equal or denser than 0.6 &micro;T and SHOULD have a resolution
3140equal or denser than 0.2 &micro;.</li>
3141 <li>SHOULD be temperature compensated.</li>
3142 <li>MUST support online calibration and compensation of the hard iron bias, and
3143preserve the compensation parameters between device reboots.</li>
3144 <li>MUST have the soft iron compensation applied&mdash;the calibration can be done either
3145while in use or during the production of the device.</li>
3146 <li>SHOULD have a standard deviation, calculated on a per axis basis on samples
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3147collected over a period of at least 3 seconds at the fastest sampling rate, no
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3148greater than 0.5 &micro;T.</li>
3149 <li>SHOULD implement a TYPE_ROTATION_VECTOR composite sensor, if an accelerometer
3150sensor and a gyroscope sensor is also included.</li>
3151 <li>MAY implement the TYPE_GEOMAGNETIC_ROTATION_VECTOR sensor if an accelerometer
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3152sensor is also implemented. However if implemented, it MUST consume less than
315310 mW and SHOULD consume less than 3 mW when the sensor is registered for batch
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3154mode at 10 Hz.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3155</ul>
3156
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3157<h3 id="7_3_3_gps">7.3.3. GPS</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3158
3159
3160<p>Device implementations SHOULD include a GPS receiver. If a device
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3161implementation does include a GPS receiver, it SHOULD include some form of&ldquo;assisted GPS&rdquo; technique to minimize GPS lock-on time.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3162
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3163<h3 id="7_3_4_gyroscope">7.3.4. Gyroscope</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3164
3165
3166<p>Device implementations SHOULD include a gyroscope (angular change sensor).
3167Devices SHOULD NOT include a gyroscope sensor unless a 3-axis accelerometer is
3168also included. If a device implementation includes a gyroscope, it:</p>
3169
3170<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3171 <li>MUST implement the TYPE_GYROSCOPE sensor and SHOULD also implement
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3172TYPE_GYROSCOPE_UNCALIBRATED sensor. Existing and new Android devices are
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3173strongly encouraged to implement the SENSOR_TYPE_GYROSCOPE_UNCALIBRATED sensor.</li>
3174 <li>MUST be capable of measuring orientation changes up to 1,000 degrees per second.</li>
Unsuk Jung42630a32015-06-05 03:59:33 -0700[diff] [blame]3175 <li>MUST be able to report events up to a frequency of at least 50 Hz for
3176 Android Watch devices as such devices have a stricter power constraint and
3177 100 Hz for all other device types.</li>
3178 <li>SHOULD report events up to at least 200 Hz.</li>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3179 <li>MUST have a resolution of 12-bits or more and SHOULD have a resolution of
318016-bits or more.</li>
3181 <li>MUST be temperature compensated.</li>
3182 <li>MUST be calibrated and compensated while in use, and preserve the compensation
3183parameters between device reboots.</li>
3184 <li>MUST have a variance no greater than 1e-7 rad^2 / s^2 per Hz (variance per Hz,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3185or rad^2 / s). The variance is allowed to vary with the sampling rate, but must
3186be constrained by this value. In other words, if you measure the variance of
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3187the gyro at 1 Hz sampling rate it should be no greater than 1e-7 rad^2/s^2.</li>
3188 <li>SHOULD implement a TYPE_ROTATION_VECTOR composite sensor, if an accelerometer
3189sensor and a magnetometer sensor is also included.</li>
3190 <li>If an accelerometer sensor is included, MUST implement the TYPE_GRAVITY and
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3191TYPE_LINEAR_ACCELERATION composite sensors and SHOULD implement the
3192TYPE_GAME_ROTATION_VECTOR composite sensor. Existing and new Android devices
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3193are strongly encouraged to implement the TYPE_GAME_ROTATION_VECTOR sensor.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3194</ul>
3195
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3196<h3 id="7_3_5_barometer">7.3.5. Barometer</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3197
3198
3199<p>Device implementations SHOULD include a barometer (ambient air pressure
3200sensor). If a device implementation includes a barometer, it:</p>
3201
3202<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3203 <li>MUST implement and report TYPE_PRESSURE sensor.</li>
3204 <li>MUST be able to deliver events at 5 Hz or greater.</li>
3205 <li>MUST have adequate precision to enable estimating altitude.</li>
3206 <li>MUST be temperature compensated.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3207</ul>
3208
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3209<h3 id="7_3_6_thermometer">7.3.6. Thermometer</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3210
3211
3212<p>Device implementations MAY include an ambient thermometer (temperature sensor).
3213If present, it MUST be defined as SENSOR_TYPE_AMBIENT_TEMPERATURE and it MUST
3214measure the ambient (room) temperature in degrees Celsius.</p>
3215
3216<p>Device implementations MAY but SHOULD NOT include a CPU temperature sensor. If
3217present, it MUST be defined as SENSOR_TYPE_TEMPERATURE, it MUST measure the
3218temperature of the device CPU, and it MUST NOT measure any other temperature.
3219Note the SENSOR_TYPE_TEMPERATURE sensor type was deprecated in Android 4.0.</p>
3220
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3221<h3 id="7_3_7_photometer">7.3.7. Photometer</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3222
3223
3224<p>Device implementations MAY include a photometer (ambient light sensor).</p>
3225
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3226<h3 id="7_3_8_proximity_sensor">7.3.8. Proximity Sensor</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3227
3228
3229<p>Device implementations MAY include a proximity sensor. Devices that can make a
3230voice call and indicate any value other than PHONE_TYPE_NONE in getPhoneType
3231SHOULD include a proximity sensor. If a device implementation does include a
3232proximity sensor, it:</p>
3233
3234<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3235 <li>MUST measure the proximity of an object in the same direction as the screen.
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3236That is, the proximity sensor MUST be oriented to detect objects close to the
3237screen, as the primary intent of this sensor type is to detect a phone in use
3238by the user. If a device implementation includes a proximity sensor with any
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3239other orientation, it MUST NOT be accessible through this API.</li>
3240 <li>MUST have 1-bit of accuracy or more.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3241</ul>
3242
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3243<h2 id="7_4_data_connectivity">7.4. Data Connectivity</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3244
3245
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3246<h3 id="7_4_1_telephony">7.4.1. Telephony</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3247
3248
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3249<p>&ldquo;Telephony&rdquo; as used by the Android APIs and this document refers specifically
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3250to hardware related to placing voice calls and sending SMS messages via a GSM
3251or CDMA network. While these voice calls may or may not be packet-switched,
3252they are for the purposes of Android considered independent of any data
3253connectivity that may be implemented using the same network. In other words,
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3254the Android &ldquo;telephony&rdquo; functionality and APIs refer specifically to voice
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3255calls and SMS. For instance, device implementations that cannot place calls or
3256send/receive SMS messages MUST NOT report the android.hardware.telephony
3257feature or any subfeatures, regardless of whether they use a cellular network
3258for data connectivity.</p>
3259
3260<p>Android MAY be used on devices that do not include telephony hardware. That is,
3261Android is compatible with devices that are not phones. However, if a device
3262implementation does include GSM or CDMA telephony, it MUST implement full
3263support for the API for that technology. Device implementations that do not
3264include telephony hardware MUST implement the full APIs as no-ops.</p>
3265
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3266<h3 id="7_4_2_ieee_802_11_wi-fi">7.4.2. IEEE 802.11 (Wi-Fi)</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3267
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3268<div class="note">
3269<p>Android Television device implementations MUST include Wi-Fi support.</p>
3270</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3271
3272
3273<p>Android Television device implementations MUST include support for one or more
3274forms of 802.11 (b/g/a/n, etc.) and other types of Android device
3275implementation SHOULD include support for one or more forms of 802.11. If a
3276device implementation does include support for 802.11 and exposes the
3277functionality to a third-party application, it MUST implement the corresponding
3278Android API and:</p>
3279
3280<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3281 <li>MUST report the hardware feature flag android.hardware.wifi.</li>
3282 <li>MUST implement the multicast API as described in the SDK documentation [<a href="http://developer.android.com/reference/android/net/wifi/WifiManager.MulticastLock.html">Resources, 79</a>].</li>
3283 <li>MUST support multicast DNS (mDNS) and MUST NOT filter mDNS packets
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3284(224.0.0.251) at any time of operation including when the screen is not in an
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3285active state.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3286</ul>
3287
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3288<h4 id="7_4_2_1_wi-fi_direct">7.4.2.1. Wi-Fi Direct</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3289
3290
3291<p>Device implementations SHOULD include support for Wi-Fi Direct (Wi-Fi
3292peer-to-peer). If a device implementation does include support for Wi-Fi
3293Direct, it MUST implement the corresponding Android API as described in the SDK
3294documentation [<a href="http://developer.android.com/reference/android/net/wifi/p2p/WifiP2pManager.html">Resources, 80</a>]. If a device implementation includes support for Wi-Fi Direct, then it:</p>
3295
3296<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3297 <li>MUST report the hardware feature android.hardware.wifi.direct.</li>
3298 <li>MUST support regular Wi-Fi operation.</li>
3299 <li>SHOULD support concurrent Wi-Fi and Wi-Fi Direct operation.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3300</ul>
3301
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3302<h4 id="7_4_2_2_wi-fi_tunneled_direct_link_setup">7.4.2.2. Wi-Fi Tunneled Direct Link Setup</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3303
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3304<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3305<p>Android Television device implementations MUST include support for Wi-Fi
3306Tunneled Direct Link Setup (TDLS).</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3307</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3308
3309
3310<p>Android Television device implementations MUST include support for Wi-Fi
3311Tunneled Direct Link Setup (TDLS) and other types of Android device
3312implementations SHOULD include support for Wi-Fi TDLS as described in the
3313Android SDK Documentation [<a href="http://developer.android.com/reference/android/net/wifi/WifiManager.html">Resources, 81</a>]. If a device implementation does include support for TDLS and TDLS is enabled
3314by the WiFiManager API, the device:</p>
3315
3316<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3317 <li>SHOULD use TDLS only when it is possible AND beneficial.</li>
3318 <li>SHOULD have some heuristic and NOT use TDLS when its performance might be worse
3319than going through the Wi-Fi access point.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3320</ul>
3321
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3322<h3 id="7_4_3_bluetooth">7.4.3. Bluetooth</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3323
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3324<div class="note">
Heidi von Markhamdf9fb7c2015-04-02 16:49:09 -0700[diff] [blame]3325<p>Android Watch and Automotive implementations MUST support Bluetooth. Android
3326Television implementations MUST support Bluetooth and Bluetooth LE.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3327</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3328
3329
3330<p>Android includes support for Bluetooth and Bluetooth Low Energy [<a href="http://developer.android.com/reference/android/bluetooth/package-summary.html">Resources, 82</a>]. Device implementations that include support for Bluetooth and Bluetooth Low
3331Energy MUST declare the relevant platform features (android.hardware.bluetooth
3332and android.hardware.bluetooth_le respectively) and implement the platform
3333APIs. Device implementations SHOULD implement relevant Bluetooth profiles such
3334as A2DP, AVCP, OBEX, etc. as appropriate for the device. Android Television
3335device implementations MUST support Bluetooth and Bluetooth LE. </p>
3336
3337<p>Device implementations including support for Bluetooth Low Energy:</p>
3338
3339<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3340 <li>MUST declare the hardware feature android.hardware.bluetooth_le.</li>
3341 <li>MUST enable the GATT (generic attribute profile) based Bluetooth APIs as
3342described in the SDK documentation and [<a href="http://developer.android.com/reference/android/bluetooth/package-summary.html">Resources, 82</a>].</li>
3343 <li>SHOULD support offloading of the filtering logic to the bluetooth chipset when
3344implementing the ScanFilter API [<a href="https://developer.android.com/reference/android/bluetooth/le/ScanFilter.html">Resources, 83</a>], and MUST report the correct value of where the filtering logic is implemented whenever queried via the
3345android.bluetooth.BluetoothAdapter.isOffloadedFilteringSupported() method.</li>
3346 <li>SHOULD support offloading of the batched scanning to the bluetooth chipset, but
3347if not supported, MUST report &lsquo;false&rsquo; whenever queried via the
3348android.bluetooth.BluetoothAdapater.isOffloadedScanBatchingSupported() method.</li>
3349 <li>SHOULD support multi advertisement with at least 4 slots, but if not supported,
3350MUST report &lsquo;false&rsquo; whenever queried via the
3351android.bluetooth.BluetoothAdapter.isMultipleAdvertisementSupported() method.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3352</ul>
3353
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3354<h3 id="7_4_4_near-field_communications">7.4.4. Near-Field Communications</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3355
3356
3357<p>Device implementations SHOULD include a transceiver and related hardware for
3358Near-Field Communications (NFC). If a device implementation does include NFC
3359hardware and plans to make it available to third-party apps, then it:</p>
3360
3361<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3362 <li>MUST report the android.hardware.nfc feature from the
3363android.content.pm.PackageManager.hasSystemFeature() method [<a href="http://developer.android.com/reference/android/content/pm/PackageManager.html">Resources, 53</a>].</li>
3364 <li>MUST be capable of reading and writing NDEF messages via the following NFC
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3365standards:
3366 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3367 <li>MUST be capable of acting as an NFC Forum reader/writer (as defined by the NFC
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3368Forum technical specification NFCForum-TS-DigitalProtocol-1.0) via the
3369following NFC standards:
3370 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3371 <li>NfcA (ISO14443-3A)</li>
3372 <li>NfcB (ISO14443-3B)</li>
3373 <li>NfcF (JIS 6319-4)</li>
3374 <li>IsoDep (ISO 14443-4)</li>
3375 <li>NFC Forum Tag Types 1, 2, 3, 4 (defined by the NFC Forum)</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3376 </ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3377 <li>SHOULD be capable of reading and writing NDEF messages via the following NFC
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3378standards. Note that while the NFC standards below are stated as SHOULD, the
3379Compatibility Definition for a future version is planned to change these to
3380MUST. These standards are optional in this version but will be required in
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3381future versions. Existing and new devices that run this version of Android are <strong>very strongly encouraged</strong> to meet these requirements now so they will be able to upgrade to the future platform releases.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3382 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3383 <li>NfcV (ISO 15693)</li>
3384 </ul></li>
3385 <li>MUST be capable of transmitting and receiving data via the following
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3386peer-to-peer standards and protocols:
3387 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3388 <li>ISO 18092</li>
3389 <li>LLCP 1.0 (defined by the NFC Forum)</li>
3390 <li>SDP 1.0 (defined by the NFC Forum)</li>
3391 <li>NDEF Push Protocol [<a href="http://static.googleusercontent.com/media/source.android.com/en/us/compatibility/ndef-push-protocol.pdf">Resources, 84</a>]</li>
3392 <li>SNEP 1.0 (defined by the NFC Forum)</li>
3393 </ul></li>
3394 <li>MUST include support for Android Beam [<a href="http://developer.android.com/guide/topics/connectivity/nfc/nfc.html">Resources, 85</a>]:
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3395 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3396 <li>MUST implement the SNEP default server. Valid NDEF messages received by the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3397default SNEP server MUST be dispatched to applications using the
3398android.nfc.ACTION_NDEF_DISCOVERED intent. Disabling Android Beam in settings
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3399MUST NOT disable dispatch of incoming NDEF message.</li>
3400 <li>MUST honor the android.settings.NFCSHARING_SETTINGS intent to show NFC sharing
3401settings [<a href="http://developer.android.com/reference/android/provider/Settings.html#ACTION_NFCSHARING_SETTINGS">Resources, 86</a>].</li>
3402 <li>MUST implement the NPP server. Messages received by the NPP server MUST be
3403processed the same way as the SNEP default server.</li>
3404 <li>MUST implement a SNEP client and attempt to send outbound P2P NDEF to the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3405default SNEP server when Android Beam is enabled. If no default SNEP server is
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3406found then the client MUST attempt to send to an NPP server.</li>
3407 <li>MUST allow foreground activities to set the outbound P2P NDEF message using
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3408android.nfc.NfcAdapter.setNdefPushMessage, and
3409android.nfc.NfcAdapter.setNdefPushMessageCallback, and
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3410android.nfc.NfcAdapter.enableForegroundNdefPush.</li>
3411 <li>SHOULD use a gesture or on-screen confirmation, such as 'Touch to Beam', before
3412sending outbound P2P NDEF messages.</li>
3413 <li>SHOULD enable Android Beam by default and MUST be able to send and receive
3414using Android Beam, even when another proprietary NFC P2p mode is turned on.</li>
3415 <li>MUST support NFC Connection handover to Bluetooth when the device supports
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3416Bluetooth Object Push Profile. Device implementations MUST support connection
3417handover to Bluetooth when using android.nfc.NfcAdapter.setBeamPushUris, by
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3418implementing the &ldquo;Connection Handover version 1.2&rdquo; [<a href="http://members.nfc-forum.org/specs/spec_list/#conn_handover">Resources, 87</a>] and &ldquo;Bluetooth Secure Simple Pairing Using NFC version 1.0&rdquo; [<a href="http://members.nfc-forum.org/apps/group_public/download.php/18688/NFCForum-AD-BTSSP_1_1.pdf">Resources, 88</a>] specs from the NFC Forum. Such an implementation MUST implement the handover
3419LLCP service with service name &ldquo;urn:nfc:sn:handover&rdquo; for exchanging the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3420handover request/select records over NFC, and it MUST use the Bluetooth Object
3421Push Profile for the actual Bluetooth data transfer. For legacy reasons (to
3422remain compatible with Android 4.1 devices), the implementation SHOULD still
3423accept SNEP GET requests for exchanging the handover request/select records
3424over NFC. However an implementation itself SHOULD NOT send SNEP GET requests
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3425for performing connection handover.</li>
3426 </ul></li>
3427 <li>MUST poll for all supported technologies while in NFC discovery mode.</li>
3428 <li>SHOULD be in NFC discovery mode while the device is awake with the screen
3429active and the lock-screen unlocked.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3430</ul>
3431</ul>
3432
3433<p>(Note that publicly available links are not available for the JIS, ISO, and NFC
3434Forum specifications cited above.)</p>
3435
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]3436<p>Android includes support for NFC Host Card Emulation (HCE) mode. If a
Unsuk Junga4705782015-06-05 04:13:28 -0700[diff] [blame]3437device implementation does include an NFC controller chipset capable of HCE and
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3438Application ID (AID) routing, then it:</p>
3439
3440<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3441 <li>MUST report the android.hardware.nfc.hce feature constant.</li>
3442 <li>MUST support NFC HCE APIs as defined in the Android SDK [<a href="http://developer.android.com/guide/topics/connectivity/nfc/hce.html">Resources, 10</a>].</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3443</ul>
3444
3445<p>Additionally, device implementations MAY include reader/writer support for the
3446following MIFARE technologies.</p>
3447
3448<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3449 <li>MIFARE Classic</li>
3450 <li>MIFARE Ultralight</li>
3451 <li>NDEF on MIFARE Classic</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3452</ul>
3453
3454<p>Note that Android includes APIs for these MIFARE types. If a device
3455implementation supports MIFARE in the reader/writer role, it:</p>
3456
3457<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3458 <li>MUST implement the corresponding Android APIs as documented by the Android SDK.</li>
3459 <li>MUST report the feature com.nxp.mifare from the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3460android.content.pm.PackageManager.hasSystemFeature() meth<a href="http://developer.android.com/reference/android/content/pm/PackageManager.html">od [Resources, 53]</a>. Note that this is not a standard Android feature and as such does not appear
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3461as a constant on the PackageManager class.</li>
3462 <li>MUST NOT implement the corresponding Android APIs nor report the com.nxp.mifare
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3463feature unless it also implements general NFC support as described in this
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3464section.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3465</ul>
3466
3467<p>If a device implementation does not include NFC hardware, it MUST NOT declare
3468the android.hardware.nfc feature from the
3469android.content.pm.PackageManager.hasSystemFeature() method [<a href="http://developer.android.com/reference/android/content/pm/PackageManager.html">Resources, 53]</a>, and MUST implement the Android NFC API as a no-op.</p>
3470
3471<p>As the classes android.nfc.NdefMessage and android.nfc.NdefRecord represent a
3472protocol-independent data representation format, device implementations MUST
3473implement these APIs even if they do not include support for NFC or declare the
3474android.hardware.nfc feature.</p>
3475
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3476<h3 id="7_4_5_minimum_network_capability">7.4.5. Minimum Network Capability</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3477
3478
3479<p>Device implementations MUST include support for one or more forms of data
3480networking. Specifically, device implementations MUST include support for at
3481least one data standard capable of 200Kbit/sec or greater. Examples of
3482technologies that satisfy this requirement include EDGE, HSPA, EV-DO, 802.11g,
3483Ethernet, Bluetooth PAN, etc.</p>
3484
3485<p>Device implementations where a physical networking standard (such as Ethernet)
3486is the primary data connection SHOULD also include support for at least one
3487common wireless data standard, such as 802.11 (Wi-Fi).</p>
3488
3489<p>Devices MAY implement more than one form of data connectivity.</p>
3490
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3491<h3 id="7_4_6_sync_settings">7.4.6. Sync Settings</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3492
3493
3494<p>Device implementations MUST have the master auto-sync setting on by default so
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3495that the method getMasterSyncAutomatically() returns &ldquo;true&rdquo; [<a href="http://developer.android.com/reference/android/content/ContentResolver.html">Resources, 89</a>].</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3496
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3497<h2 id="7_5_cameras">7.5. Cameras</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3498
3499
3500<p>Device implementations SHOULD include a rear-facing camera and MAY include a
3501front-facing camera. A rear-facing camera is a camera located on the side of
3502the device opposite the display; that is, it images scenes on the far side of
3503the device, like a traditional camera. A front-facing camera is a camera
3504located on the same side of the device as the display; that is, a camera
3505typically used to image the user, such as for video conferencing and similar
3506applications.</p>
3507
3508<p>If a device implementation includes at least one camera, it SHOULD be possible
3509for an application to simultaneously allocate 3 bitmaps equal to the size of
3510the images produced by the largest-resolution camera sensor on the device.</p>
3511
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3512<h3 id="7_5_1_rear-facing_camera">7.5.1. Rear-Facing Camera</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3513
3514
3515<p>Device implementations SHOULD include a rear-facing camera. If a device
3516implementation includes at least one rear-facing camera, it:</p>
3517
3518<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3519 <li>MUST report the feature flag android.hardware.camera and
3520android.hardware.camera.any.</li>
3521 <li>MUST have a resolution of at least 2 megapixels.</li>
3522 <li>SHOULD have either hardware auto-focus or software auto-focus implemented in
3523the camera driver (transparent to application software).</li>
3524 <li>MAY have fixed-focus or EDOF (extended depth of field) hardware.</li>
3525 <li>MAY include a flash. If the Camera includes a flash, the flash lamp MUST NOT be
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3526lit while an android.hardware.Camera.PreviewCallback instance has been
3527registered on a Camera preview surface, unless the application has explicitly
3528enabled the flash by enabling the FLASH_MODE_AUTO or FLASH_MODE_ON attributes
3529of a Camera.Parameters object. Note that this constraint does not apply to the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3530device&rsquo;s built-in system camera application, but only to third-party
3531applications using Camera.PreviewCallback.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3532</ul>
3533
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3534<h3 id="7_5_2_front-facing_camera">7.5.2. Front-Facing Camera</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3535
3536
3537<p>Device implementations MAY include a front-facing camera. If a device
3538implementation includes at least one front-facing camera, it:</p>
3539
3540<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3541 <li>MUST report the feature flag android.hardware.camera.any and
3542android.hardware.camera.front.</li>
3543 <li>MUST have a resolution of at least VGA (640x480 pixels).</li>
3544 <li>MUST NOT use a front-facing camera as the default for the Camera API. The
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3545camera API in Android has specific support for front-facing cameras and device
3546implementations MUST NOT configure the API to to treat a front-facing camera as
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3547the default rear-facing camera, even if it is the only camera on the device.</li>
3548 <li>MAY include features (such as auto-focus, flash, etc.) available to rear-facing
3549cameras as described in <a href="#7_5_1_rear-facing_camera">section 7.5.1</a>.</li>
3550 <li>MUST horizontally reflect (i.e. mirror) the stream displayed by an app in a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3551CameraPreview, as follows:
3552 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3553 <li>If the device implementation is capable of being rotated by user (such as
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3554automatically via an accelerometer or manually via user input), the camera
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3555preview MUST be mirrored horizontally relative to the device&rsquo;s current
3556orientation.</li>
3557 <li>If the current application has explicitly requested that the Camera display be
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3558rotated via a call to the android.hardware.Camera.setDisplayOrientation()[<a href="http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)">Resources, 90</a>] method, the camera preview MUST be mirrored horizontally relative to the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3559orientation specified by the application.</li>
3560 <li>Otherwise, the preview MUST be mirrored along the device&rsquo;s default horizontal
3561axis.</li>
3562 </ul></li>
3563 <li>MUST mirror the image displayed by the postview in the same manner as the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3564camera preview image stream. If the device implementation does not support
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3565postview, this requirement obviously does not apply.</li>
3566 <li>MUST NOT mirror the final captured still image or video streams returned to
3567application callbacks or committed to media storage.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3568</ul>
3569
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3570<h3 id="7_5_3_external_camera">7.5.3. External Camera</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3571
3572
3573<p>Device implementations with USB host mode MAY include support for an external
3574camera that connects to the USB port. If a device includes support for an
3575external camera, it:</p>
3576
3577<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3578 <li>MUST declare the platform feature android.hardware.camera.external and
3579android.hardware camera.any.</li>
3580 <li>MUST support USB Video Class (UVC 1.0 or higher).</li>
3581 <li>MAY support multiple cameras.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3582</ul>
3583
3584<p>Video compression (such as MJPEG) support is RECOMMENDED to enable transfer of
3585high-quality unencoded streams (i.e. raw or independently compressed picture
3586streams). Camera-based video encoding MAY be supported. If so, a simultaneous
3587unencoded/ MJPEG stream (QVGA or greater resolution) MUST be accessible to the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3588device implementation.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3589
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3590<h3 id="7_5_4_camera_api_behavior">7.5.4. Camera API Behavior</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3591
3592
3593<p>Android includes two API packages to access the camera, the newer
3594android.hardware.camera2 API expose lower-level camera control to the app,
3595including efficient zero-copy burst/streaming flows and per-frame controls of
3596exposure, gain, white balance gains, color conversion, denoising, sharpening,
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3597and more.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3598
3599<p>The older API package, android.hardware.Camera, is marked as deprecated in
3600Android 5.0 but as it should still be available for apps to use Android device
3601implementations MUST ensure the continued support of the API as described in
3602this section and in the Android SDK.</p>
3603
3604<p>Device implementations MUST implement the following behaviors for the
3605camera-related APIs, for all available cameras:</p>
3606
3607<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3608 <li>If an application has never called
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3609android.hardware.Camera.Parameters.setPreviewFormat(int), then the device MUST
3610use android.hardware.PixelFormat.YCbCr_420_SP for preview data provided to
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3611application callbacks.</li>
3612 <li>If an application registers an android.hardware.Camera.PreviewCallback instance
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3613and the system calls the onPreviewFrame() method when the preview format is
3614YCbCr_420_SP, the data in the byte[] passed into onPreviewFrame() must further
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3615be in the NV21 encoding format. That is, NV21 MUST be the default.</li>
3616 <li>For android.hardware.Camera, device implementations MUST support the YV12
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3617format (as denoted by the android.graphics.ImageFormat.YV12 constant) for
3618camera previews for both front- and rear-facing cameras. (The hardware video
3619encoder and camera may use any native pixel format, but the device
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3620implementation MUST support conversion to YV12.)</li>
3621 <li>For android.hardware.camera2, device implementations must support the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3622android.hardware.ImageFormat.YUV_420_888 and android.hardware.ImageFormat.JPEG
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3623formats as outputs through the android.media.ImageReader API.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3624</ul>
3625
3626<p>Device implementations MUST still implement the full Camera API included in the
3627Android SDK documentation [<a href="http://developer.android.com/reference/android/hardware/Camera.html">Resources, 91</a>], regardless of whether the device includes hardware autofocus or other
3628capabilities. For instance, cameras that lack autofocus MUST still call any
3629registered android.hardware.Camera.AutoFocusCallback instances (even though
3630this has no relevance to a non-autofocus camera.) Note that this does apply to
3631front-facing cameras; for instance, even though most front-facing cameras do
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3632not support autofocus, the API callbacks must still be &ldquo;faked&rdquo; as described.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3633
3634<p>Device implementations MUST recognize and honor each parameter name defined as
3635a constant on the android.hardware.Camera.Parameters class, if the underlying
3636hardware supports the feature. If the device hardware does not support a
3637feature, the API must behave as documented. Conversely, device implementations
3638MUST NOT honor or recognize string constants passed to the
3639android.hardware.Camera.setParameters() method other than those documented as
3640constants on the android.hardware.Camera.Parameters. That is, device
3641implementations MUST support all standard Camera parameters if the hardware
3642allows, and MUST NOT support custom Camera parameter types. For instance,
3643device implementations that support image capture using high dynamic range
3644(HDR) imaging techniques MUST support camera parameter Camera.SCENE_MODE_HDR [<a href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html">Resources, 92</a>].</p>
3645
3646<p>Because not all device implementations can fully support all the features of
3647the android.hardware.camera2 API, device implementations MUST report the proper
3648level of support with the android.info.supportedHardwareLevel property as
3649described in the Android SDK [<a href="https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#INFO_SUPPORTED_HARDWARE_LEVEL">Resources, 93]</a> and report the appropriate framework feature flags [<a href="http://source.android.com/devices/camera/versioning.html">Resources, 94]</a>. </p>
3650
3651<p>Device implementations MUST also declare its Individual camera capabilities of
3652android.hardware.camera2 via the android.request.availableCapabilities property
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3653and declare the appropriate feature flags [<a href="http://source.android.com/devices/camera/versioning.html">Resources, 94]</a>; a device must define the feature flag if any of its attached camera devices supports the feature.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3654
3655<p>Device implementations MUST broadcast the Camera.ACTION_NEW_PICTURE intent
3656whenever a new picture is taken by the camera and the entry of the picture has
3657been added to the media store.</p>
3658
3659<p>Device implementations MUST broadcast the Camera.ACTION_NEW_VIDEO intent
3660whenever a new video is recorded by the camera and the entry of the picture has
3661been added to the media store.</p>
3662
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3663<h3 id="7_5_5_camera_orientation">7.5.5. Camera Orientation</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3664
3665
3666<p>Both front- and rear-facing cameras, if present, MUST be oriented so that the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3667long dimension of the camera aligns with the screen&rsquo;s long dimension. That is,
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3668when the device is held in the landscape orientation, cameras MUST capture
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3669images in the landscape orientation. This applies regardless of the device&rsquo;s
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3670natural orientation; that is, it applies to landscape-primary devices as well
3671as portrait-primary devices.</p>
3672
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3673<h2 id="7_6_memory_and_storage">7.6. Memory and Storage</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3674
3675
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3676<h3 id="7_6_1_minimum_memory_and_storage">7.6.1. Minimum Memory and Storage</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3677
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3678<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3679<p>Android Television devices MUST have at least 5GB of non-volatile storage
3680available for application private data.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3681</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3682
3683
3684<p>The memory available to the kernel and userspace on device implementations MUST
3685be at least equal or larger than the minimum values specified by the following
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3686table. (See <a href="#7_1_1_screen_configuration">section 7.1.1</a> for screen size and density definitions.)</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3687<table>
3688 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3689 <th>Density and screen size</th>
3690 <th>32-bit device</th>
3691 <th>64-bit device</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3692 </tr>
3693 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3694 <td>Android Watch devices (due to smaller screens)</td>
3695 <td>416MB</td>
3696 <td>Not applicable</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3697 </tr>
3698 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3699 <td><ul>
Unsuk Jungbd2e50c2015-05-18 21:45:06 -0700[diff] [blame]3700 <li class="table_list">hdpi or lower on small/normal screens</li>
3701 <li class="table_list">mdpi or lower on large screens</li>
3702 <li class="table_list">ldpi or lower on extra large screens</li>
3703 </ul></td>
3704 <td>424MB</td>
3705 <td>Not applicable</td>
3706 </tr>
3707 <tr>
3708 <td><ul>
3709 <li class="table_list">xhdpi or higher on small/normal screens</li>
3710 <li class="table_list">hdpi or higher on large screens</li>
3711 <li class="table_list">mdpi or higher on extra large screens</li></ul></td>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3712 <td>512MB</td>
3713 <td>832MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3714 </tr>
3715 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3716 <td><ul>
3717 <li class="table_list">400dpi or higher on small/normal screens</li>
3718 <li class="table_list">xhdpi or higher on large screens</li>
3719 <li class="table_list">tvdpi or higher on extra large screens</li></ul></td>
3720 <td>896MB</td>
3721 <td>1280MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3722 </tr>
3723 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3724 <td><ul>
3725 <li class="table_list">560dpi or higher on small/normal screens</li>
3726 <li class="table_list">400dpi or higher on large screens</li>
3727 <li class="table_list">xhdpi or higher on extra large screens</li></ul></td>
3728 <td>1344MB</td>
3729 <td>1824MB</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3730 </tr>
3731</table>
3732
3733
3734<p>The minimum memory values MUST be in addition to any memory space already
3735dedicated to hardware components such as radio, video, and so on that is not
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3736under the kernel&rsquo;s control.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3737
Unsuk Jungbd2e50c2015-05-18 21:45:06 -0700[diff] [blame]3738<p>Device implementations with less than 512MB of memory available to the kernel
3739and userspace, unless an Android Watch, MUST return the value "true" for
3740ActivityManager.isLowRamDevice().</p>
3741
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3742<p>Android Television devices MUST have at least 5GB and other device
3743implementations MUST have at least 1.5GB of non-volatile storage available for
3744application private data. That is, the /data partition MUST be at least 5GB for
3745Android Television devices and at least 1.5GB for other device implementations.
3746Device implementations that run Android are <strong>very strongly encouraged</strong> to have at least 3GB of non-volatile storage for application private data so
3747they will be able to upgrade to the future platform releases.</p>
3748
3749<p>The Android APIs include a Download Manager that applications MAY use to
3750download data files [<a href="http://developer.android.com/reference/android/app/DownloadManager.html">Resources, 95</a>]. The device implementation of the Download Manager MUST be capable of
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3751downloading individual files of at least 100MB in size to the default &ldquo;cache"
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3752location.</p>
3753
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3754<h3 id="7_6_2_application_shared_storage">7.6.2. Application Shared Storage</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3755
3756
3757<p>Device implementations MUST offer shared storage for applications also often
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3758referred as &ldquo;shared external storage&rdquo;. </p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3759
3760<p>Device implementations MUST be configured with shared storage mounted by
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3761default, &ldquo;out of the box&rdquo;. If the shared storage is not mounted on the Linux
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3762path /sdcard, then the device MUST include a Linux symbolic link from /sdcard
3763to the actual mount point.</p>
3764
3765<p>Device implementations MAY have hardware for user-accessible removable storage,
3766such as a Secure Digital (SD) card slot. If this slot is used to satisfy the
3767shared storage requirement, the device implementation:</p>
3768
3769<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3770 <li>MUST implement a toast or pop-up user interface warning the user when there is
3771no SD card.</li>
3772 <li>MUST include a FAT-formatted SD card 1GB in size or larger OR show on the box
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3773and other material available at time of purchase that the SD card has to be
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3774separately purchased.</li>
3775 <li>MUST mount the SD card by default.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3776</ul>
3777
3778<p>Alternatively, device implementations MAY allocate internal (non-removable)
3779storage as shared storage for apps as included in the upstream Android Open
3780Source Project; device implementations SHOULD use this configuration and
3781software implementation. If a device implementation uses internal
3782(non-removable) storage to satisfy the shared storage requirement, that storage
3783MUST be 1GB in size or larger and mounted on /sdcard (or /sdcard MUST be a
3784symbolic link to the physical location if it is mounted elsewhere).</p>
3785
3786<p>Device implementations MUST enforce as documented the
3787android.permission.WRITE_EXTERNAL_STORAGE permission on this shared storage.
3788Shared storage MUST otherwise be writable by any application that obtains that
3789permission.</p>
3790
3791<p>Device implementations that include multiple shared storage paths (such as both
3792an SD card slot and shared internal storage) MUST NOT allow Android
3793applications to write to the secondary external storage, except for their
3794package-specific directories on the secondary external storage, but SHOULD
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3795expose content from both storage paths transparently through Android&rsquo;s media
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3796scanner service and android.provider.MediaStore.</p>
3797
3798<p>Regardless of the form of shared storage used, device implementations MUST
3799provide some mechanism to access the contents of shared storage from a host
3800computer, such as USB mass storage (UMS) or Media Transfer Protocol (MTP).
3801Device implementations MAY use USB mass storage, but SHOULD use Media Transfer
3802Protocol. If the device implementation supports Media Transfer Protocol, it:</p>
3803
3804<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3805 <li>SHOULD be compatible with the reference Android MTP host, Android File Transfer
3806[<a href="http://www.android.com/filetransfer">Resources, 96</a>].</li>
3807 <li>SHOULD report a USB device class of 0x00.</li>
3808 <li>SHOULD report a USB interface name of 'MTP'.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3809</ul>
3810
3811<p>If the device implementation lacks USB ports, it MUST provide a host computer
3812with access to the contents of shared storage by some other means, such as a
3813network file system.</p>
3814
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3815<h2 id="7_7_usb">7.7. USB</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3816
3817
3818<p>Device implementations SHOULD support USB peripheral mode and SHOULD support
3819USB host mode.</p>
3820
3821<p>If a device implementation includes a USB port supporting peripheral mode:</p>
3822
3823<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3824 <li>The port MUST be connectable to a USB host that has a standard type-A or type
3825-C USB port.</li>
3826 <li>The port SHOULD use micro-A, micro-AB or type-C USB form factor. Existing and
3827new Android devices are <strong>very strongly encouraged to meet these requirements</strong> so they will be able to upgrade to the future platform releases.</li>
3828 <li>The port SHOULD be centered in the middle of an edge. Device implementations
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3829SHOULD either locate the port on the bottom of the device (according to natural
3830orientation) or enable software screen rotation for all apps (including home
3831screen), so that the display draws correctly when the device is oriented with
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3832the port at bottom. Existing and new Android devices are <strong>very strongly encouraged to meet these requirements</strong> so they will be able to upgrade to future platform releases.</li>
3833 <li>It MUST allow a USB host connected with the Android device to access the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3834contents of the shared storage volume using either USB mass storage or Media
3835Transfer Protocol, if the device reports the android.hardware.feature.output
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3836feature or the android.hardware.camera feature.</li>
3837 <li>It SHOULD implement the Android Open Accessory (AOA) API and specification as
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3838documented in the Android SDK documentation, and if it is an Android Handheld
3839device it MUST implement the AOA API. Device implementations implementing the
3840AOA specification:
3841 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3842 <li>MUST declare support for the hardware feature android.hardware.usb.accessory [<a href="http://developer.android.com/guide/topics/connectivity/usb/accessory.html">Resources, 97</a>].</li>
3843 <li>MUST implement the USB audio class as documented in the Android SDK
3844documentation [<a href="http://developer.android.com/reference/android/hardware/usb/UsbConstants.html#USB_CLASS_AUDIO">Resources, 98</a>].</li>
3845 </ul></li>
3846 <li>It SHOULD implement support to draw 1.5 A current during HS chirp and traffic
3847as specified in the USB battery charging specification [<a href="http://www.usb.org/developers/docs/devclass_docs/USB_Battery_Charging_1.2.pdf">Resources, 99</a>]. Existing and new Android devices are <strong>very strongly encouraged to meet these requirements</strong> so they will be able to upgrade to the future platform releases.</li>
3848 <li>The value of iSerialNumber in USB standard device descriptor MUST be equal to
3849the value of android.os.Build.SERIAL.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3850</ul>
3851
3852<p>If a device implementation includes a USB port supporting host mode, it:</p>
3853
3854<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3855 <li>SHOULD use a type-C USB port, if the device implementation supports USB 3.1.</li>
3856 <li>MAY use a non-standard port form factor, but if so MUST ship with a cable or
3857cables adapting the port to a standard type-A or type-C USB port.</li>
3858 <li>MAY use a micro-AB USB port, but if so SHOULD ship with a cable or cables
3859adapting the port to a standard type-A or type-C USB port.</li>
3860 <li>is <strong>very strongly RECOMMENDED</strong> to implement the USB audio class as documented in the Android SDK
3861documentation [<a href="http://developer.android.com/reference/android/hardware/usb/UsbConstants.html#USB_CLASS_AUDIO">Resources, 98</a>].</li>
3862 <li>MUST implement the Android USB host API as documented in the Android SDK, and
3863MUST declare support for the hardware feature android.hardware.usb.host [<a href="http://developer.android.com/guide/topics/connectivity/usb/host.html">Resources, 100</a>].</li>
3864 <li>SHOULD support the Charging Downstream Port output current range of 1.5 A ~ 5 A
3865as specified in the USB Battery Charging Specifications [<a href="http://www.usb.org/developers/docs/devclass_docs/USB_Battery_Charging_1.2.pdf">Resources, 99</a>].</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3866</ul>
3867
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3868<h2 id="7_8_audio">7.8. Audio</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3869
3870
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3871<h3 id="7_8_1_microphone">7.8.1. Microphone</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3872
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3873<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3874<p>Android Handheld and Watch devices MUST include a microphone.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3875</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3876
3877
3878<p>Device implementations MAY omit a microphone. However, if a device
3879implementation omits a microphone, it MUST NOT report the
3880android.hardware.microphone feature constant, and MUST implement the audio
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3881recording API at least as no-ops, per <a href="#7_hardware_compatibility">section 7</a>. Conversely, device implementations that do possess a microphone:</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3882
3883<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3884 <li>MUST report the android.hardware.microphone feature constant
3885 <li>MUST meet the audio recording requirements in <a href="#5_4_audio_recording">section 5.4</a>
3886 <li>MUST meet the audio latency requirements in <a href="#5_6_audio_latency">section 5.6</a>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3887</ul>
3888
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3889<h3 id="7_8_2_audio_output">7.8.2. Audio Output</h3>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3890
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3891<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3892<p>Android Watch devices MAY include an audio output.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3893</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3894
3895<p>Device implementations including a speaker or with an audio/multimedia output
3896port for an audio output peripheral as a headset or an external speaker:</p>
3897
3898<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3899 <li>MUST report the android.hardware.audio.output feature constant.</li>
3900 <li>MUST meet the audio playback requirements in <a href="#5_5_audio_playback">section 5.5</a>.</li>
3901 <li>MUST meet the audio latency requirements in <a href="#5_6_audio_latency">section 5.6</a>.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3902</ul>
3903
3904<p>Conversely, if a device implementation does not include a speaker or audio
3905output port, it MUST NOT report the android.hardware.audio output feature, and
3906MUST implement the Audio Output related APIs as no-ops at least. </p>
3907
3908<p>Android Watch device implementation MAY but SHOULD NOT have audio output, but
3909other types of Android device implementations MUST have an audio output and
3910declare android.hardware.audio.output.</p>
3911
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3912<h4 id="7_8_2_1_analog_audio_ports">7.8.2.1. Analog Audio Ports</h4>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3913
3914
3915<p>In order to be compatible with the headsets and other audio accessories using
3916the 3.5mm audio plug across the Android ecosystem [<a href="http://source.android.com/accessories/headset-spec.html">Resources, 101</a>], if a device implementation includes one or more analog audio ports, at least
3917one of the audio port(s) SHOULD be a 4 conductor 3.5mm audio jack. If a device
3918implementation has a 4 conductor 3.5mm audio jack, it:</p>
3919
3920<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3921 <li>MUST support audio playback to stereo headphones and stereo headsets with a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3922microphone, and SHOULD support audio recording from stereo headsets with a
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3923microphone.</li>
3924 <li>MUST support TRRS audio plugs with the CTIA pin-out order, and SHOULD support
3925audio plugs with the OMTP pin-out order.</li>
3926 <li>MUST support the detection of microphone on the plugged in audio accessory, if
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3927the device implementation supports a microphone, and broadcast the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3928android.intent.action.HEADSET_PLUG with the extra value microphone set as 1.</li>
3929 <li>SHOULD support the detection and mapping to the keycodes for the following 3
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3930ranges of equivalent impedance between the microphone and ground conductors on
3931the audio plug:
3932 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3933 <li><strong>70 ohm or less</strong>: KEYCODE_HEADSETHOOK</li>
3934 <li><strong>210&#45;290 Ohm</strong>:<strong> </strong>KEYCODE_VOLUME_UP</li>
3935 <li><strong>360&#45;680 Ohm</strong>: KEYCODE_VOLUME_DOWN</li>
3936 </ul></li>
3937 <li>SHOULD support the detection and mapping to the keycode for the following range
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3938of equivalent impedance between the microphone and ground conductors on the
3939audio plug:
3940 <ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3941 <li><strong>110&#45;180 Ohm: </strong>KEYCODE_VOICE_ASSIST</li>
3942 </ul></li>
3943 <li>MUST trigger ACTION_HEADSET_PLUG upon a plug insert, but only after all
3944contacts on plug are touching their relevant segments on the jack.</li>
3945 <li>MUST be capable of driving at least 150mV +/- 10% of output voltage on a 32 Ohm
3946speaker impedance.</li>
3947 <li>MUST have a microphone bias voltage between 1.8V ~ 2.9V.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3948</ul>
3949
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3950<h1 id="8_performance_compatibility">8. Performance Compatibility</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3951
3952
3953<p>Some minimum performance criterias are critical to the user experience and
3954impacts the baseline assumptions developers would have when developing an app.
3955Android Watch devices SHOULD and other type of device implementations MUST meet
3956the following criteria:</p>
3957
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3958<h2 id="8_1_user_experience_consistency">8.1. User Experience Consistency</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3959
3960
3961<p>Device implementations MUST provide a smooth user interface by ensuring a
3962consistent frame rate and response times for applications and games. Device
3963implementations MUST meet the following requirements: </p>
3964
3965<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3966 <li><strong>Consistent frame latency</strong>. Inconsistent frame latency or a delay to render frames MUST NOT happen more
3967often than 5 frames in a second, and SHOULD be below 1 frames in a second.</li>
3968 <li><strong>User interface latency</strong>. Device implementations MUST ensure low latency user experience by scrolling a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3969list of 10K list entries as defined by the Android Compatibility Test Suite
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3970(CTS) in less than 36 secs.</li>
3971 <li><strong>Task switching</strong>. When multiple applications have been launched, re-launching an already-running
3972application after it has been launched MUST take less than 1 second.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3973</ul>
3974
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3975<h2 id="8_2_file_i_o_access_performance">8.2. File I/O Access Performance</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3976
3977
3978<p>Device implementations MUST ensure file access performance consistency for read
3979and write operations. </p>
3980
3981<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3982 <li><strong>Sequential write</strong>. Device implementations MUST ensure a sequential write performance of 10MB/s
3983for a 256MB file using 10MB write buffer.</li>
3984 <li><strong>Random write</strong>. Device implementations MUST ensure a random write performance of 0.5MB/s for a
3985256MB file using 4KB write buffer.</li>
3986 <li><strong>Sequential read</strong>. Device implementations MUST ensure a sequential read performance of 15MB/s for
3987a 256MB file using 10MB write buffer.</li>
3988 <li><strong>Random read</strong>. Device implementations MUST ensure a random read performance of 3.5MB/s for a
3989256MB file using 4KB write buffer.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3990</ul>
3991
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]3992<h1 id="9_security_model_compatibility">9. Security Model Compatibility</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]3993
3994
3995<p>Device implementations MUST implement a security model consistent with the
3996Android platform security model as defined in Security and Permissions
3997reference document in the APIs [<a href="http://developer.android.com/guide/topics/security/permissions.html">Resources, 102</a>] in the Android developer documentation. Device implementations MUST support
3998installation of self-signed applications without requiring any additional
3999permissions/certificates from any third parties/authorities. Specifically,
4000compatible devices MUST support the security mechanisms described in the follow
4001subsections.</p>
4002
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4003<h2 id="9_1_permissions">9.1. Permissions</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4004
4005
4006<p>Device implementations MUST support the Android permissions model as defined in
4007the Android developer documentation [<a href="http://developer.android.com/guide/topics/security/permissions.html">Resources, 102</a>]. Specifically, implementations MUST enforce each permission defined as
4008described in the SDK documentation; no permissions may be omitted, altered, or
4009ignored. Implementations MAY add additional permissions, provided the new
4010permission ID strings are not in the android.* namespace.</p>
4011
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4012<h2 id="9_2_uid_and_process_isolation">9.2. UID and Process Isolation</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4013
4014
4015<p>Device implementations MUST support the Android application sandbox model, in
4016which each application runs as a unique Unixstyle UID and in a separate
4017process. Device implementations MUST support running multiple applications as
4018the same Linux user ID, provided that the applications are properly signed and
4019constructed, as defined in the Security and Permissions reference [<a href="http://developer.android.com/guide/topics/security/permissions.html">Resources, 102</a>].</p>
4020
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4021<h2 id="9_3_filesystem_permissions">9.3. Filesystem Permissions</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4022
4023
4024<p>Device implementations MUST support the Android file access permissions model
4025as defined in the Security and Permissions reference [<a href="http://developer.android.com/guide/topics/security/permissions.html">Resources, 102</a>].</p>
4026
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4027<h2 id="9_4_alternate_execution_environments">9.4. Alternate Execution Environments</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4028
4029
4030<p>Device implementations MAY include runtime environments that execute
4031applications using some other software or technology than the Dalvik Executable
4032Format or native code. However, such alternate execution environments MUST NOT
4033compromise the Android security model or the security of installed Android
4034applications, as described in this section.</p>
4035
4036<p>Alternate runtimes MUST themselves be Android applications, and abide by the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4037standard Android security model, as described elsewhere in <a href="#9_security_model_compatibility">section 9</a>.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4038
4039<p>Alternate runtimes MUST NOT be granted access to resources protected by
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4040permissions not requested in the runtime&rsquo;s AndroidManifest.xml file via the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4041<uses-permission> mechanism.</p>
4042
4043<p>Alternate runtimes MUST NOT permit applications to make use of features
4044protected by Android permissions restricted to system applications.</p>
4045
4046<p>Alternate runtimes MUST abide by the Android sandbox model. Specifically,
4047alternate runtimes:</p>
4048
4049<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4050 <li>SHOULD install apps via the PackageManager into separate Android sandboxes (
4051Linux user IDs, etc.).</li>
4052 <li>MAY provide a single Android sandbox shared by all applications using the
4053alternate runtime.</li>
4054 <li>and installed applications using an alternate runtime, MUST NOT reuse the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4055sandbox of any other app installed on the device, except through the standard
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4056Android mechanisms of shared user ID and signing certificate.</li>
4057 <li>MUST NOT launch with, grant, or be granted access to the sandboxes
4058corresponding to other Android applications.</li>
4059 <li>MUST NOT be launched with, be granted, or grant to other applications any
4060privileges of the superuser (root), or of any other user ID.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4061</ul>
4062
4063<p>The .apk files of alternate runtimes MAY be included in the system image of a
4064device implementation, but MUST be signed with a key distinct from the key used
4065to sign other applications included with the device implementation.</p>
4066
4067<p>When installing applications, alternate runtimes MUST obtain user consent for
4068the Android permissions used by the application. If an application needs to
4069make use of a device resource for which there is a corresponding Android
4070permission (such as Camera, GPS, etc.), the alternate runtime MUST inform the
4071user that the application will be able to access that resource. If the runtime
4072environment does not record application capabilities in this manner, the
4073runtime environment MUST list all permissions held by the runtime itself when
4074installing any application using that runtime.</p>
4075
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4076<h2 id="9_5_multi-user_support">9.5. Multi-User Support</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4077
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4078<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4079<p>This feature is optional for all device types.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4080</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4081
4082
4083<p>Android includes support for multiple users and provides support for full user
4084isolation [<a href="http://developer.android.com/reference/android/os/UserManager.html">Resources, 103]</a>. Device implementations MAY enable multiple users, but when enabled MUST meet
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4085the following requirements related to multi-user support [<a href="http://source.android.com/devices/storage/">Resources, 104</a>]:</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4086
4087<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4088 <li>Device implementations that do not declare the android.hardware.telephony
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4089feature flag MUST support restricted profiles, a feature that allows device
4090owners to manage additional users and their capabilities on the device. With
4091restricted profiles, device owners can quickly set up separate environments for
4092additional users to work in, with the ability to manage finer-grained
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4093restrictions in the apps that are available in those environments.</li>
4094 <li>Conversely device implementations that declare the android.hardware.telephony
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4095feature flag MUST NOT support restricted profiles but MUST align with the AOSP
4096implementation of controls to enable /disable other users from accessing the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4097voice calls and SMS.</li>
4098 <li>Device implementations MUST, for each user, implement a security model
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4099consistent with the Android platform security model as defined in Security and
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4100Permissions reference document in the APIs [<a href="http://developer.android.com/guide/topics/security/permissions.html">Resources, 102</a>].</li>
4101 <li>Device implementations MAY support creating users and managed profiles via the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4102android.app.admin.DevicePolicyManager APIs, and if supported, MUST declare the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4103platform feature flag android.software.managed_users.
4104 <li>Device implementations that declare the feature flag
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4105android.software.managed_users MUST use the upstream AOSP icon badge to
4106represent the managed applications and other badge UI elements like Recents &
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4107Notifications.</li>
4108 <li>Each user instance on an Android device MUST have separate and isolated
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4109external storage directories. Device implementations MAY store multiple users'
4110data on the same volume or filesystem. However, the device implementation MUST
4111ensure that applications owned by and running on behalf a given user cannot
4112list, read, or write to data owned by any other user. Note that removable
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4113media, such as SD card slots, can allow one user to access another&rsquo;s data by
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4114means of a host PC. For this reason, device implementations that use removable
4115media for the external storage APIs MUST encrypt the contents of the SD card if
4116multiuser is enabled using a key stored only on non-removable media accessible
4117only to the system. As this will make the media unreadable by a host PC, device
4118implementations will be required to switch to MTP or a similar system to
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4119provide host PCs with access to the current user&rsquo;s data. Accordingly, device
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4120implementations MAY but SHOULD NOT enable multi-user if they use removable
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4121media [<a href="http://developer.android.com/reference/android/os/Environment.html">Resources, 105</a>] for primary external storage.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4122</ul>
4123
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4124<h2 id="9_6_premium_sms_warning">9.6. Premium SMS Warning</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4125
4126
4127<p>Android includes support for warning users of any outgoing premium SMS message
4128[<a href="http://en.wikipedia.org/wiki/Short_code">Resources, 106</a>] . Premium SMS messages are text messages sent to a service registered with a
4129carrier that may incur a charge to the user. Device implementations that
4130declare support for android.hardware.telephony MUST warn users before sending a
4131SMS message to numbers identified by regular expressions defined in
4132/data/misc/sms/codes.xml file in the device. The upstream Android Open Source
4133Project provides an implementation that satisfies this requirement.</p>
4134
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4135<h2 id="9_7_kernel_security_features">9.7. Kernel Security Features</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4136
4137
4138<p>The Android Sandbox includes features that can use the Security-Enhanced Linux
4139(SELinux) mandatory access control (MAC) system and other security features in
4140the Linux kernel. SELinux or any other security features, if implemented below
4141the Android framework:</p>
4142
4143<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4144 <li>MUST maintain compatibility with existing applications.</li>
4145 <li>MUST NOT have a visible user interface when a security violation is detected
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4146and successfully blocked, but MAY have a visible user interface when an
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4147unblocked security violation occurs resulting in a successful exploit.</li>
4148 <li>SHOULD NOT be user or developer configurable.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4149</ul>
4150
4151<p>If any API for configuration of policy is exposed to an application that can
4152affect another application (such as a Device Administration API), the API MUST
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4153NOT allow configurations that break compatibility.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4154
4155<p>Devices MUST implement SELinux or an equivalent mandatory access control system
4156if using a kernel other than Linux and meet the following requirements, which
4157are satisfied by the reference implementation in the upstream Android Open
4158Source Project.</p>
4159
4160<p>Device implementations:</p>
4161
4162<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4163 <li>MUST support a SELinux policy that allows the SELinux mode to be set on a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4164per-domain basis, and MUST configure all domains in enforcing mode. No
4165permissive mode domains are allowed, including domains specific to a
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4166device/vendor.</li>
4167 <li>SHOULD load policy from /sepolicy file on the device.</li>
4168 <li>MUST NOT modify, omit, or replace the neverallow rules present within the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4169sepolicy file provided in the upstream Android Open Source Project (AOSP) and
4170the policy MUST compile with all neverallow present, for both AOSP SELinux
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4171domains as well as device/vendor specific domains.</li>
4172 <li>MUST support dynamic updates of the SELinux policy file without requiring a
4173system image update.</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4174</ul>
4175
4176<p>Device implementations SHOULD retain the default SELinux policy provided in the
4177upstream Android Open Source Project, until they have first audited their
4178additions to the SELinux policy. Device implementations MUST be compatible with
4179the upstream Android Open Source Project.</p>
4180
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4181<h2 id="9_8_privacy">9.8. Privacy</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4182
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4183<p>If the device implements functionality in the system that captures the contents
4184displayed on the screen and/or records the audio stream played on the device,
4185it MUST continuously notify the user whenever this functionality is enabled and
4186actively capturing/recording.</p>
4187
Unsuk Jungf57ea352015-05-27 16:38:32 -0700[diff] [blame]4188<p>If a device implementation has a mechanism that routes network data traffic
4189through a proxy server or VPN gateway by default (for example, preloading a VPN
4190service with android.permission.CONTROL_VPN granted), the device implementation
4191MUST ask for the user's consent before enabling that mechanism.</p>
4192
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4193<h2 id="9_9_full-disk_encryption">9.9. Full-Disk Encryption</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4194
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4195<div class="note">
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4196<p>Optional for Android device implementations without a lock screen.</p>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4197</div>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4198
4199
Unsuk Jung18378642015-05-18 19:26:50 -0700[diff] [blame]4200<p>If the device implementation supports a lock screen with PIN (numeric) or
4201PASSWORD (alphanumeric), the device MUST support full-disk encryption of the
4202application private data (/data partition), as well
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4203as the SD card partition if it is a permanent, non-removable part of the device
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4204[<a href="http://source.android.com/devices/tech/security/encryption/index.html">Resources, 107</a>]. For devices supporting full-disk encryption, the full-disk encryption SHOULD
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4205be enabled all the time after the user has completed the out-of-box experience.
4206While this requirement is stated as SHOULD for this version of the Android
4207platform, it is <strong>very strongly RECOMMENDED</strong> as we expect this to change to MUST in the future versions of Android.
4208Encryption MUST use AES with a key of 128-bits (or greater) and a mode designed
4209for storage (for example, AES-XTS, AES-CBC-ESSIV). The encryption key MUST NOT
4210be written to storage at any time without being encrypted. Other than when in
4211active use, the encryption key SHOULD be AES encrypted with the lockscreen
4212passcode stretched using a slow stretching algorithm (e.g. PBKDF2 or scrypt).
4213If the user has not specified a lockscreen passcode or has disabled use of the
4214passcode for encryption, the system SHOULD use a default passcode to wrap the
4215encryption key. If the device provides a hardware-backed keystore, the password
4216stretching algorithm MUST be cryptographically bound to that keystore. The
4217encryption key MUST NOT be sent off the device (even when wrapped with the user
4218passcode and/or hardware bound key). The upstream Android Open Source project
4219provides a preferred implementation of this feature based on the linux kernel
4220feature dm-crypt.</p>
4221
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4222<h2 id="9_10_verified_boot">9.10. Verified Boot</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4223
4224
4225<p>Device implementations SHOULD support verified boot for device integrity, and
4226if the feature is supported it MUST declare the platform feature flag
4227android.software.verified_boot. While this requirement is stated as SHOULD for
4228this version of the Android platform, it is <strong>very strongly RECOMMENDED</strong> as we expect this to change to MUST in the future versions of Android. The
4229upstream Android Open Source Project provides a preferred implementation of
4230this feature based on the linux kernel feature dm-verity.</p>
4231
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4232<h1 id="10_software_compatibility_testing">10. Software Compatibility Testing</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4233
4234
4235<p>Device implementations MUST pass all tests described in this section.</p>
4236
4237<p>However, note that no software test package is fully comprehensive. For this
4238reason, device implementers are <strong>very strongly encouraged</strong> to make the minimum number of changes as possible to the reference and
4239preferred implementation of Android available from the Android Open Source
4240Project. This will minimize the risk of introducing bugs that create
4241incompatibilities requiring rework and potential device updates.</p>
4242
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4243<h2 id="10_1_compatibility_test_suite">10.1. Compatibility Test Suite</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4244
4245
4246<p>Device implementations MUST pass the Android Compatibility Test Suite (CTS) [<a href="http://source.android.com/compatibility/index.html">Resources, 108</a>] available from the Android Open Source Project, using the final shipping
4247software on the device. Additionally, device implementers SHOULD use the
4248reference implementation in the Android Open Source tree as much as possible,
4249and MUST ensure compatibility in cases of ambiguity in CTS and for any
4250reimplementations of parts of the reference source code.</p>
4251
4252<p>The CTS is designed to be run on an actual device. Like any software, the CTS
4253may itself contain bugs. The CTS will be versioned independently of this
4254Compatibility Definition, and multiple revisions of the CTS may be released for
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]4255Android 5.1. Device implementations MUST pass the latest CTS version available
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4256at the time the device software is completed.</p>
4257
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4258<h2 id="10_2_cts_verifier">10.2. CTS Verifier</h2>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4259
4260
4261<p>Device implementations MUST correctly execute all applicable cases in the CTS
4262Verifier. The CTS Verifier is included with the Compatibility Test Suite, and
4263is intended to be run by a human operator to test functionality that cannot be
4264tested by an automated system, such as correct functioning of a camera and
4265sensors.</p>
4266
4267<p>The CTS Verifier has tests for many kinds of hardware, including some hardware
4268that is optional. Device implementations MUST pass all tests for hardware that
4269they possess; for instance, if a device possesses an accelerometer, it MUST
4270correctly execute the Accelerometer test case in the CTS Verifier. Test cases
4271for features noted as optional by this Compatibility Definition Document MAY be
4272skipped or omitted.</p>
4273
4274<p>Every device and every build MUST correctly run the CTS Verifier, as noted
4275above. However, since many builds are very similar, device implementers are not
4276expected to explicitly run the CTS Verifier on builds that differ only in
4277trivial ways. Specifically, device implementations that differ from an
4278implementation that has passed the CTS Verifier only by the set of included
4279locales, branding, etc. MAY omit the CTS Verifier test.</p>
4280
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4281<h1 id="11_updatable_software">11. Updatable Software</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4282
4283
4284<p>Device implementations MUST include a mechanism to replace the entirety of the
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4285system software. The mechanism need not perform &ldquo;live&rdquo; upgrades&mdash;that is, a
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4286device restart MAY be required.</p>
4287
4288<p>Any method can be used, provided that it can replace the entirety of the
4289software preinstalled on the device. For instance, any of the following
4290approaches will satisfy this requirement:</p>
4291
4292<ul>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4293 <li>Over-the-air (OTA) downloads with offline update via reboot</li>
4294 <li>&ldquo;Tethered&rdquo; updates over USB from a host PC</li>
4295 <li>&ldquo;Offline&rdquo; updates via a reboot and update from a file on removable storage</li>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4296</ul>
4297
4298<p>However, if the device implementation includes support for an unmetered data
4299connection such as 802.11 or Bluetooth PAN (Personal Area Network) profile, the
4300device MUST support Over-the-air download with offline update via reboot.</p>
4301
4302<p>The update mechanism used MUST support updates without wiping user data. That
4303is, the update mechanism MUST preserve application private data and application
4304shared data. Note that the upstream Android software includes an update
4305mechanism that satisfies this requirement.</p>
4306
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]4307<p>For device implementations that are launching with Android 5.1 and later, the
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4308update mechanism SHOULD support verifying that the system image is binary
4309identical to expected result following an OTA. The block-based OTA
4310implementation in the upstream Android Open Source Project, added since Android
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]43115.1, satisfies this requirement.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4312
4313<p>If an error is found in a device implementation after it has been released but
4314within its reasonable product lifetime that is determined in consultation with
4315the Android Compatibility Team to affect the compatibility of third-party
4316applications, the device implementer MUST correct the error via a software
4317update available that can be applied per the mechanism just described.</p>
4318
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4319<h1 id="12_document_changelog">12. Document Changelog</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4320
4321
4322<p>The following table contains a summary of the changes to the Compatibility
4323Definition in this release. </p>
4324<table>
4325 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4326 <th>Section</th>
4327 <th>Summary of change</th>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4328 </tr>
4329 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4330 <td>1. Introduction</td>
4331 <td>Updated requirements to refer to SDK documentation as source of truth.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4332 </tr>
4333 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4334 <td>2. Device Types</td>
4335 <td>Included definitions for device types for handheld, television, and watch
4336devices.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4337 </tr>
4338 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4339 <td>2.1 Device Configuration</td>
4340 <td>Added non-exhaustive list to illustrate hardware configuration deviation across
4341devices.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4342 </tr>
4343 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4344 <td>3.1. Managed API Compatibility</td>
4345 <td>MUST also provide complete implementations of APIs with &ldquo;@SystemApi&rdquo; marker in
4346the upstream Android source code.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4347 </tr>
4348 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4349 <td>3.2.2. Build Parameters</td>
4350 <td>Included SUPPORTED_ABIS, SUPPORTED_32_BIT_ABIS, and SUPPORTED_64_BIT_ABIS
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4351parameters in list, updated PRODUCT to require unique Product SKUs, and updated
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4352TAGS.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4353 </tr>
4354 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4355 <td>3.2.3.1. Core Application Intents</td>
4356 <td>Clarified language that the compatibility requirement is for mainly the intents
4357pattern </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4358 </tr>
4359 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4360 <td>3.2.3.5. Default App Settings</td>
4361 <td>Included new requirements for home screen, NFC, and default SMS applications.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4362 </tr>
4363 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4364 <td>3.3.1 Application Binary Interfaces</td>
4365 <td>Added requirements to support equivalent 32-bit ABI if any 64-bit ABI is
4366supported. Updated parameters to reflect this change.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4367 </tr>
4368 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4369 <td>3.4.1. WebView Compatibility</td>
4370 <td>Webview compatibility required for all devices except Android Watch devices.
4371Removed Locale string requirement.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4372 </tr>
4373 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4374 <td>3.4.2. Browser compatibility</td>
4375 <td>Android Television and Watch Devices MAY omit a browser application, but all
4376other types of device implementations MUST include one.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4377 </tr>
4378 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4379 <td>3.7. Runtime compatibility</td>
4380 <td>Updated Minimum application memory requirements</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4381 </tr>
4382 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4383 <td>3.8.2. Widgets</td>
4384 <td>Widget support is optional for all device types, but recommended for Handheld
4385Devices.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4386 </tr>
4387 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4388 <td>3.8.3. Notifications</td>
4389 <td>Expanded definitions for types of supported notifications. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4390 </tr>
4391 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4392 <td>3.8.4. Search</td>
4393 <td>Android Television devices MUST include global search. All other device types
4394SHOULD.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4395 </tr>
4396 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4397 <td>3.8.6. Themes</td>
4398 <td>Devices MUST support material theme.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4399 </tr>
4400 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4401 <td>3.8.7. Live Wallpapers</td>
4402 <td>Devices that include live wallpaper MUST report the platform feature flag
4403android.software.live_wallpaper.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4404 </tr>
4405 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4406 <td>3.8.8. Activity Switching</td>
4407 <td>Advised requirement to support new Recents User Interface</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4408 </tr>
4409 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4410 <td>3.8.10. Lock Screen Media Remote Control</td>
4411 <td> Remote Control Client API deprecated in favor of the Media Notification
4412Template</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4413 </tr>
4414 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4415 <td>3.8.11. Dreams</td>
4416 <td>Optional for Android Watch devices. Required for all other device types.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4417 </tr>
4418 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4419 <td>3.8.13 Unicode and font</td>
4420 <td>MUST support Roboto 2 in addition to existing requirements.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4421 </tr>
Heidi von Markhame400e052015-05-26 14:35:49 -0700[diff] [blame]4422 <tr>
4423 <td>3.11 Text-To-Speech</td>
4424 <td>Added Android automotive requirements.</td>
4425 </tr>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4426 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4427 <td>3.12. TV Input Framework</td>
4428 <td>Android Television device implementations MUST support Television Input
4429Framework.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4430 </tr>
4431 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4432 <td>5.1. Media Codecs</td>
4433 <td>Added 3 sections for Audio, Image, and Video codecs.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4434 </tr>
4435 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4436 <td>5.4 Audio Recording</td>
4437 <td>Broken into subsections</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4438 </tr>
4439 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4440 <td>5.4.1. Raw audio capture</td>
4441 <td>Defined characteristics for raw audio capture on devices that declare
4442android.hardware.microphone</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4443 </tr>
4444 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4445 <td>5.5. Audio Playback</td>
4446 <td>Added section 5.5. Audio Playback with 2 subsections: 5.5.1 Audio Effects and
44475.5.2. Audio Output Volume</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4448 </tr>
4449 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4450 <td>5.6 Audio Latency</td>
4451 <td>Added definitions and requirements for cold output jitter, cold input jitter,
4452and continuous round-trip latency.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4453 </tr>
4454 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4455 <td>5.8 Secure Media</td>
4456 <td>Included secure media requirements from 7.1.8. External Displays and added
4457requirements for Android Television.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4458 </tr>
4459 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4460 <td>6.1. Developer Tools</td>
4461 <td>Updated resources.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4462 </tr>
4463 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4464 <td>6.2.1. Experimental</td>
4465 <td>Removed section</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4466 </tr>
4467 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4468 <td>7. Hardware Compatibility</td>
4469 <td>Updated to reflect that device implementations MUST consistently report
4470accurate hardware configuration for the same build fingerprint.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4471 </tr>
4472 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4473 <td>7.1.1.1. Screen Size</td>
4474 <td>Updated to reflect Android Watch devices screen size and that the value can&rsquo;t
4475change</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4476 </tr>
4477 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4478 <td>7.1.1.2. Screen Aspect Ratio</td>
4479 <td>Updated to reflect Android Watch devices screen aspect ratio (1:1).</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4480 </tr>
4481 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4482 <td>7.1.3. Screen Orientation</td>
4483 <td>Updated to reflect that devices with a fixed orientation landscape screen
4484SHOULD only report that orientation. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4485 </tr>
4486 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4487 <td>7.1.4. 2D and 3D Graphics Acceleration</td>
4488 <td>Added that Android devices MAY support the Android extension pack. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4489 </tr>
4490 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4491 <td>(old) 7.1.6. Screen Types</td>
4492 <td>Section Removed </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4493 </tr>
4494 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4495 <td>7.1.6. Screen Technology</td>
4496 <td>Updated pixel aspect ratio (PAR) to be between 0.9 and 1.15. (~15% tolerance)</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4497 </tr>
4498 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4499 <td>7.1.7. External Displays</td>
4500 <td>Moved part of section to section 5.8. Secure Media.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4501 </tr>
Heidi von Markham43b1cc72015-04-02 16:04:43 -0700[diff] [blame]4502 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4503 <td>7.2 Input Devices</td>
4504 <td>Added general intro statement.</td>
Heidi von Markham43b1cc72015-04-02 16:04:43 -0700[diff] [blame]4505 </tr>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4506 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4507 <td>7.2.2. Non-touch Navigation</td>
4508 <td>Android Television devices MUST support D-pad. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4509 </tr>
4510 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4511 <td>7.2.3. Navigation keys</td>
4512 <td>Included language for support across different device types. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4513 </tr>
4514 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4515 <td>7.2.4. Touchscreen input</td>
4516 <td>Android Watch devices MUST support touchscreen input. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4517 </tr>
4518 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4519 <td>7.2.6. Game Controller Support</td>
4520 <td>Added section with Android Television requirements.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4521 </tr>
4522 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4523 <td>7.2.7. Remote Control </td>
4524 <td>Added section with Android Television requirements.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4525 </tr>
4526 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4527 <td>7.3. Sensors</td>
4528 <td>Redefined synthetic sensors as composite sensors and streaming sensors as
4529continuous sensors. Sensors should report event time in nanoseconds.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4530 </tr>
4531 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4532 <td>7.3.1. Accelerometer</td>
4533 <td>Clarified required sensor types and revised requirement thresholds. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4534 </tr>
4535 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4536 <td>7.3.2. Magnetometer</td>
4537 <td>Clarified required sensor types and revised requirement thresholds.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4538 </tr>
4539 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4540 <td>7.3.4. Gyroscope</td>
4541 <td>Clarified required sensor types and revised requirement thresholds.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4542 </tr>
4543 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4544 <td>7.3.5. Barometer</td>
4545 <td>Changed from MAY to SHOULD implement barometer. MUST implement and report
4546TYPE_PRESSURE sensor.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4547 </tr>
4548 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4549 <td>7.3.6. Thermometer</td>
4550 <td>Devices MAY include ambient thermometer. MAY but SHOULD NOT include CPU
4551thermometer.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4552 </tr>
4553 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4554 <td>7.3.8. Proximity Sensor</td>
4555 <td>Devices that can make a voice call and indicate any value other than
4556PHONE_TYPE_NONE in getPhoneType SHOULD include a proximity sensor.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4557 </tr>
4558 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4559 <td>7.4.2. IEEE 802.11 (Wi-Fi)</td>
4560 <td>Android Television devices MUST include Wi-Fi support. Devices that DO support
4561wifi must report android.hardware.wifi. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4562 </tr>
4563 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4564 <td>7.4.2.1. Wi-Fi Direct</td>
4565 <td>MUST report the hardware feature android.hardware.wifi.direct.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4566 </tr>
4567 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4568 <td>7.4.2.2. Wi-Fi Tunneled Direct Link Setup</td>
4569 <td>Android Television devices MUST include support for Wi-Fi TDLS.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4570 </tr>
4571 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4572 <td>7.4.3 Bluetooth</td>
4573 <td>Added Android Automotive requirements.</td>
Heidi von Markhamdf9fb7c2015-04-02 16:49:09 -0700[diff] [blame]4574 </tr>
4575 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4576 <td>7.5. Cameras</td>
4577 <td>If a device implementation includes at least one camera, it SHOULD be possible
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4578for an application to simultaneously allocate 3 bitmaps equal to the size of
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4579the images produced by the largest-resolution camera sensor on the device.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4580 </tr>
4581 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4582 <td>7.5.3. External Cameras</td>
4583 <td>Added requirements that device implementations with USB host mode MAY include
4584support for an external camera.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4585 </tr>
4586 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4587 <td>7.5.5. Camera System Features</td>
4588 <td>Added list of camera features and when they should be defined. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4589 </tr>
4590 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4591 <td>7.6.1. Minimum Memory and Storage</td>
4592 <td>Updated requirements for 32- and 64-bit devices. SVELTE memory requirement
4593removed. Devices MUST have at least 1.5GB of non-volatile storage</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4594 </tr>
4595 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4596 <td>7.6.2. Application Shared Storage</td>
4597 <td>Updated requirements for user-accessible removable storage</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4598 </tr>
4599 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4600 <td>7.7. USB</td>
4601 <td>Removed requirements for non-charging ports being on the same edge as the
4602micro-USB port. Updated requirements for Host and Peripheral mode. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4603 </tr>
4604 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4605 <td>7.8.1. Audio</td>
4606 <td>Moved microphone section here. Added requirements for Audio Output and Audio
4607Analog ports. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4608 </tr>
4609 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4610 <td>8. Performance Compatibility</td>
4611 <td>Added requirements for user interface consistency.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4612 </tr>
4613 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4614 <td>9.5. Multi-User Support</td>
4615 <td>Multi-user support feature is optional for all device types. Detailed
4616requirements by device type in section.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4617 </tr>
4618 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4619 <td>9.7. Kernel Security Features</td>
4620 <td>MAY have a visible user interface when an unblocked security violation occurs
4621resulting in a successful exploit. No permissive mode domains allowed.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4622 </tr>
4623 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4624 <td>9.9. Full-Disk Encryption</td>
4625 <td>Devices with a lock screen MUST support full-disk encryption. For new devices,
4626full-disk encryption must be enabled out of box. </td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4627 </tr>
4628 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4629 <td>9.10 Verified boot</td>
4630 <td>Added section to recommend that Device implementations support verified boot
4631for device integrity.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4632 </tr>
4633 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4634 <td>10.3. Reference Applications</td>
4635 <td>Removed section from CDD.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4636 </tr>
4637 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4638 <td>11. Updatable Software</td>
4639 <td>If a device supports 802.11 or Bluetooth PAN (Personal Area Network) profile,
4640then it MUST support Over-the-air download with offline update via reboot.</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4641 </tr>
4642 <tr>
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4643 <td>14. Resources</td>
4644 <td>Resources moved from section 2 to section 14</td>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4645 </tr>
4646</table>
4647
4648
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4649<h1 id="13_contact_us">13. Contact Us</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4650
4651
4652<p>You can join the android-compatibility forum <a href="https://groups.google.com/forum/#!forum/android-compatibility">[Resources, 109</a>] and ask for clarifications or bring up any issues that you think the document
4653does not cover.</p>
4654
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4655<h1 id="14_resources">14. Resources</h1>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4656
4657
4658<p>1. IETF RFC2119 Requirement Levels: <a href="http://www.ietf.org/rfc/rfc2119.txt">http://www.ietf.org/rfc/rfc2119.txt</a></p>
4659
4660<p>2. Android Open Source Project: <a href="http://source.android.com/">http://source.android.com/</a></p>
4661
4662<p>3. Android Television features: <a href="http://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_LEANBACK">http://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_LEANBACK</a> </p>
4663
4664<p>4. Android Watch feature: <a href="http://developer.android.com/reference/android/content/res/Configuration.html#UI_MODE_TYPE_WATCH">http://developer.android.com/reference/android/content/res/Configuration.html#UI_MODE_TYPE_WATCH</a></p>
4665
4666<p>5. API definitions and documentation: <a href="http://developer.android.com/reference/packages.html">http://developer.android.com/reference/packages.html</a></p>
4667
4668<p>6. Android Permissions reference: <a href="http://developer.android.com/reference/android/Manifest.permission.html">http://developer.android.com/reference/android/Manifest.permission.html</a></p>
4669
4670<p>7. android.os.Build reference: <a href="http://developer.android.com/reference/android/os/Build.html">http://developer.android.com/reference/android/os/Build.html</a></p>
4671
Unsuk Jungd1ac9fe2015-04-01 08:18:41 -0700[diff] [blame]4672<p>8. Android 5.1 allowed version strings: <a href="http://source.android.com/compatibility/5.1/versions.html">http://source.android.com/compatibility/5.1/versions.html</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4673
4674<p>9. Telephony Provider: <a href="http://developer.android.com/reference/android/provider/Telephony.html">http://developer.android.com/reference/android/provider/Telephony.html</a></p>
4675
4676<p>10. Host-based Card Emulation: <a href="http://developer.android.com/guide/topics/connectivity/nfc/hce.html">http://developer.android.com/guide/topics/connectivity/nfc/hce.html</a></p>
4677
4678<p>11. Android Extension Pack: <a href="http://developer.android.com/guide/topics/graphics/opengl.html#aep">http://developer.android.com/guide/topics/graphics/opengl.html#aep</a> </p>
4679
4680<p>12. android.webkit.WebView class: <a href="http://developer.android.com/reference/android/webkit/WebView.html">http://developer.android.com/reference/android/webkit/WebView.html</a></p>
4681
4682<p>13. WebView compatibility: <a href="http://www.chromium.org/">http://www.chromium.org/</a></p>
4683
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4684<p>14. HTML5: <a href="http://html.spec.whatwg.org/multipage/">http://html.spec.whatwg.org/multipage/</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4685
4686<p>15. HTML5 offline capabilities:<a href="http://dev.w3.org/html5/spec/Overview.html#offline"> http://dev.w3.org/html5/spec/Overview.html#offline</a></p>
4687
4688<p>16. HTML5 video tag: <a href="http://dev.w3.org/html5/spec/Overview.html#video">http://dev.w3.org/html5/spec/Overview.html#video</a></p>
4689
4690<p>17. HTML5/W3C geolocation API: <a href="http://www.w3.org/TR/geolocation-API/">http://www.w3.org/TR/geolocation-API/</a></p>
4691
4692<p>18. HTML5/W3C webstorage API: <a href="http://www.w3.org/TR/webstorage/">http://www.w3.org/TR/webstorage/</a></p>
4693
4694<p>19. HTML5/W3C IndexedDB API: <a href="http://www.w3.org/TR/IndexedDB/">http://www.w3.org/TR/IndexedDB/</a></p>
4695
4696<p>20. Dalvik Executable Format and bytecode specification: available in the
4697Android source code, at dalvik/docs</p>
4698
4699<p>21. AppWidgets: <a href="http://developer.android.com/guide/practices/ui_guidelines/widget_design.html">http://developer.android.com/guide/practices/ui_guidelines/widget_design.html</a></p>
4700
4701<p>22. Notifications: <a href="http://developer.android.com/guide/topics/ui/notifiers/notifications.html">http://developer.android.com/guide/topics/ui/notifiers/notifications.html</a></p>
4702
4703<p>23. Application Resources: <a href="https://developer.android.com/guide/topics/resources/available-resources.html">https://developer.android.com/guide/topics/resources/available-resources.html</a></p>
4704
4705<p>24. Status Bar icon style guide: <a href="http://developer.android.com/design/style/iconography.html">http://developer.android.com/design/style/iconography.html</a></p>
4706
4707<p>25. Notifications Resources: <a href="https://developer.android.com/design/patterns/notifications.html">https://developer.android.com/design/patterns/notifications.html</a> </p>
4708
4709<p>26. Search Manager: <a href="http://developer.android.com/reference/android/app/SearchManager.html">http://developer.android.com/reference/android/app/SearchManager.html</a> </p>
4710
4711<p>27. Toasts: <a href="http://developer.android.com/reference/android/widget/Toast.html">http://developer.android.com/reference/android/widget/Toast.html</a></p>
4712
4713<p>28. Themes: <a href="http://developer.android.com/guide/topics/ui/themes.html">http://developer.android.com/guide/topics/ui/themes.html</a></p>
4714
4715<p>29. R.style class: <a href="http://developer.android.com/reference/android/R.style.html">http://developer.android.com/reference/android/R.style.html</a></p>
4716
4717<p>30. Material design: <a href="http://developer.android.com/reference/android/R.style.html#Theme_Material">http://developer.android.com/reference/android/R.style.html#Theme_Material</a> </p>
4718
4719<p>31. Live Wallpapers: <a href="http://developer.android.com/reference/android/service/wallpaper/WallpaperService.html">http://developer.android.com/reference/android/service/wallpaper/WallpaperService.html</a></p>
4720
4721<p>32. Overview screen resources: <a href="http://developer.android.com/guide/components/recents.html">http://developer.android.com/guide/components/recents.html</a> </p>
4722
4723<p>33. Screen pinning: <a href="https://developer.android.com/about/versions/android-5.0.html#ScreenPinning">https://developer.android.com/about/versions/android-5.0.html#ScreenPinning</a> </p>
4724
4725<p>34. Input methods: <a href="http://developer.android.com/guide/topics/text/creating-input-method.html">http://developer.android.com/guide/topics/text/creating-input-method.html</a> </p>
4726
4727<p>35. Media Notification: <a href="https://developer.android.com/reference/android/app/Notification.MediaStyle.html">https://developer.android.com/reference/android/app/Notification.MediaStyle.html</a></p>
4728
4729<p>36. Dreams: <a href="http://developer.android.com/reference/android/service/dreams/DreamService.html">http://developer.android.com/reference/android/service/dreams/DreamService.html</a></p>
4730
4731<p>37. Settings.Secure LOCATION_MODE:</p>
4732
4733<p><a href="http://developer.android.com/reference/android/provider/Settings.Secure.html#LOCATION_MODE">http://developer.android.com/reference/android/provider/Settings.Secure.html#LOCATION_MODE</a></p>
4734
4735<p>38. Unicode 6.1.0: <a href="http://www.unicode.org/versions/Unicode6.1.0/">http://www.unicode.org/versions/Unicode6.1.0/</a></p>
4736
4737<p>39. Android Device Administration: <a href="http://developer.android.com/guide/topics/admin/device-admin.html">http://developer.android.com/guide/topics/admin/device-admin.html</a></p>
4738
4739<p>40. DevicePolicyManager reference: <a href="http://developer.android.com/reference/android/app/admin/DevicePolicyManager.html">http://developer.android.com/reference/android/app/admin/DevicePolicyManager.html</a></p>
4740
4741<p>41. Android Device Owner App:</p>
4742
4743<p><a href="http://developer.android.com/reference/android/app/admin/DevicePolicyManager.html#isDeviceOwnerApp(java.lang.String)">http://developer.android.com/reference/android/app/admin/DevicePolicyManager.html#isDeviceOwnerApp(java.lang.String)</a></p>
4744
4745<p>42. Android Accessibility Service APIs: <a href="http://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html">http://developer.android.com/reference/android/accessibilityservice/AccessibilityService.html</a></p>
4746
4747<p>43. Android Accessibility APIs: <a href="http://developer.android.com/reference/android/view/accessibility/package-summary.html">http://developer.android.com/reference/android/view/accessibility/package-summary.html</a></p>
4748
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4749<p>44. Eyes Free project: <a href="http://code.google.com/p/eyes-free/">http://code.google.com/p/eyes-free</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4750
4751<p>45. Text-To-Speech APIs: <a href="http://developer.android.com/reference/android/speech/tts/package-summary.html">http://developer.android.com/reference/android/speech/tts/package-summary.html</a></p>
4752
4753<p>46. Television Input Framework: <a href="https://source.android.com/devices/tv/index.html">https://source.android.com/devices/tv/index.html</a></p>
4754
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4755<p>47. Reference tool documentation (for adb, aapt, ddms, systrace): <a href="http://developer.android.com/tools/help/index.html">http://developer.android.com/tools/help/index.html</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4756
4757<p>48. Android apk file description: <a href="http://developer.android.com/guide/components/fundamentals.html">http://developer.android.com/guide/components/fundamentals.html </a></p>
4758
4759<p>49. Manifest files: <a href="http://developer.android.com/guide/topics/manifest/manifest-intro.html">http://developer.android.com/guide/topics/manifest/manifest-intro.html</a></p>
4760
4761<p>50. Android Media Formats: <a href="http://developer.android.com/guide/appendix/media-formats.html">http://developer.android.com/guide/appendix/media-formats.html</a></p>
4762
4763<p>51. RTC Hardware Coding Requirements: <a href="http://www.webmproject.org/hardware/rtc-coding-requirements/">http://www.webmproject.org/hardware/rtc-coding-requirements/</a></p>
4764
4765<p>52. AudioEffect API: <a href="http://developer.android.com/reference/android/media/audiofx/AudioEffect.html">http://developer.android.com/reference/android/media/audiofx/AudioEffect.html</a></p>
4766
4767<p>53. Android android.content.pm.PackageManager class and Hardware Features List:</p>
4768
4769<p><a href="http://developer.android.com/reference/android/content/pm/PackageManager.html">http://developer.android.com/reference/android/content/pm/PackageManager.html</a></p>
4770
4771<p>54. HTTP Live Streaming Draft Protocol: <a href="http://tools.ietf.org/html/draft-pantos-http-live-streaming-03">http://tools.ietf.org/html/draft-pantos-http-live-streaming-03</a></p>
4772
4773<p>55. ADB: <a href="http://developer.android.com/tools/help/adb.html">http://developer.android.com/tools/help/adb.html</a> </p>
4774
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4775<p>56. Dumpsys: <a href="https://source.android.com/devices/input/diagnostics.html">https://source.android.com/devices/input/diagnostics.html</a> </p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4776
4777<p>57. DDMS: <a href="http://developer.android.com/tools/debugging/ddms.html">http://developer.android.com/tools/debugging/ddms.html</a> </p>
4778
4779<p>58. Monkey testing tool: <a href="http://developer.android.com/tools/help/monkey.html">http://developer.android.com/tools/help/monkey.html</a> </p>
4780
4781<p>59. SysyTrace tool: <a href="http://developer.android.com/tools/help/systrace.html">http://developer.android.com/tools/help/systrace.html</a></p>
4782
4783<p>60. Android Application Development-Related Settings:</p>
4784
4785<p><a href="http://developer.android.com/reference/android/provider/Settings.html#ACTION_APPLICATION_DEVELOPMENT_SETTINGS">http://developer.android.com/reference/android/provider/Settings.html#ACTION_APPLICATION_DEVELOPMENT_SETTINGS</a></p>
4786
4787<p>61. Supporting Multiple Screens: <a href="http://developer.android.com/guide/practices/screens_support.html">http://developer.android.com/guide/practices/screens_support.html</a></p>
4788
4789<p>62. android.util.DisplayMetrics: <a href="http://developer.android.com/reference/android/util/DisplayMetrics.html">http://developer.android.com/reference/android/util/DisplayMetrics.html</a></p>
4790
4791<p>63. RenderScript: <a href="http://developer.android.com/guide/topics/renderscript/">http://developer.android.com/guide/topics/renderscript/</a></p>
4792
4793<p>64. Android extension pack for OpenGL ES: <a href="https://developer.android.com/reference/android/opengl/GLES31Ext.html">https://developer.android.com/reference/android/opengl/GLES31Ext.html</a> </p>
4794
4795<p>65. Hardware Acceleration: <a href="http://developer.android.com/guide/topics/graphics/hardware-accel.html">http://developer.android.com/guide/topics/graphics/hardware-accel.html</a></p>
4796
4797<p>66. EGL Extension-EGL_ANDROID_RECORDABLE:</p>
4798
4799<p><a href="http://www.khronos.org/registry/egl/extensions/ANDROID/EGL_ANDROID_recordable.txt">http://www.khronos.org/registry/egl/extensions/ANDROID/EGL_ANDROID_recordable.txt</a></p>
4800
4801<p>67. Display Manager: <a href="http://developer.android.com/reference/android/hardware/display/DisplayManager.html">http://developer.android.com/reference/android/hardware/display/DisplayManager.html</a></p>
4802
4803<p>68. android.content.res.Configuration: <a href="http://developer.android.com/reference/android/content/res/Configuration.html">http://developer.android.com/reference/android/content/res/Configuration.html</a></p>
4804
4805<p>69. Action Assist: <a href="http://developer.android.com/reference/android/content/Intent.html#ACTION_ASSIST">http://developer.android.com/reference/android/content/Intent.html#ACTION_ASSIST</a></p>
4806
4807<p>70. Touch Input Configuration: <a href="http://source.android.com/devices/tech/input/touch-devices.html">http://source.android.com/devices/tech/input/touch-devices.html</a></p>
4808
4809<p>71. Motion Event API: <a href="http://developer.android.com/reference/android/view/MotionEvent.html">http://developer.android.com/reference/android/view/MotionEvent.html</a></p>
4810
4811<p>72. Key Event API: <a href="http://developer.android.com/reference/android/view/KeyEvent.html">http://developer.android.com/reference/android/view/KeyEvent.html</a> </p>
4812
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4813<p>73. Android Open Source sensors: <a href="http://source.android.com/devices/sensors/">http://source.android.com/devices/sensors</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4814
4815<p>74. android.hardware.SensorEvent: <a href="http://developer.android.com/reference/android/hardware/SensorEvent.html">http://developer.android.com/reference/android/hardware/SensorEvent.html</a></p>
4816
4817<p>75. Timestamp sensor event: <a href="http://developer.android.com/reference/android/hardware/SensorEvent.html#timestamp">http://developer.android.com/reference/android/hardware/SensorEvent.html#timestamp</a></p>
4818
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4819<p>76. Android Open Source composite sensors: <a href="http://source.android.com/devices/sensors/sensor-types.html#composite_sensor_type_summary">https://source.android.com/devices/sensors/sensor-types.html#composite_sensor_type_summary</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4820
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4821<p>77. Continuous trigger mode: <a href="http://source.android.com/devices/sensors/report-modes.html#continuous">https://source.android.com/devices/sensors/report-modes.html#continuous</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4822
4823<p>78. Accelerometer sensor: <a href="http://developer.android.com/reference/android/hardware/Sensor.html#TYPE_ACCELEROMETER">http://developer.android.com/reference/android/hardware/Sensor.html#TYPE_ACCELEROMETER</a></p>
4824
4825<p>79. Wi-Fi Multicast API: <a href="http://developer.android.com/reference/android/net/wifi/WifiManager.MulticastLock.html">http://developer.android.com/reference/android/net/wifi/WifiManager.MulticastLock.html</a></p>
4826
4827<p>80. Wi-Fi Direct (Wi-Fi P2P): <a href="http://developer.android.com/reference/android/net/wifi/p2p/WifiP2pManager.html">http://developer.android.com/reference/android/net/wifi/p2p/WifiP2pManager.html</a></p>
4828
4829<p>81. WifiManager API: <a href="http://developer.android.com/reference/android/net/wifi/WifiManager.html">http://developer.android.com/reference/android/net/wifi/WifiManager.html</a></p>
4830
4831<p>82. Bluetooth API: <a href="http://developer.android.com/reference/android/bluetooth/package-summary.html">http://developer.android.com/reference/android/bluetooth/package-summary.html</a></p>
4832
4833<p>83. Bluetooth ScanFilter API: <a href="https://developer.android.com/reference/android/bluetooth/le/ScanFilter.html">https://developer.android.com/reference/android/bluetooth/le/ScanFilter.html</a></p>
4834
4835<p>84. NDEF Push Protocol: <a href="http://source.android.com/compatibility/ndef-push-protocol.pdf">http://source.android.com/compatibility/ndef-push-protocol.pdf</a></p>
4836
4837<p>85. Android Beam: <a href="http://developer.android.com/guide/topics/connectivity/nfc/nfc.html">http://developer.android.com/guide/topics/connectivity/nfc/nfc.html</a> </p>
4838
4839<p>86. Android NFC Sharing Settings:</p>
4840
4841<p><a href="http://developer.android.com/reference/android/provider/Settings.html#ACTION_NFCSHARING_SETTINGS">http://developer.android.com/reference/android/provider/Settings.html#ACTION_NFCSHARING_SETTINGS</a></p>
4842
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4843<p>87. NFC Connection Handover: <a href="http://members.nfc-forum.org/specs/spec_list/#conn_handover">http://members.nfc-forum.org/specs/spec_list/#conn_handover</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4844
4845<p>88. Bluetooth Secure Simple Pairing Using NFC: <a href="http://members.nfc-forum.org/apps/group_public/download.php/18688/NFCForum-AD-BTSSP_1_1.pdf">http://members.nfc-forum.org/apps/group_public/download.php/18688/NFCForum-AD-BTSSP_1_1.pdf</a> </p>
4846
4847<p>89. Content Resolver: <a href="http://developer.android.com/reference/android/content/ContentResolver.html">http://developer.android.com/reference/android/content/ContentResolver.html</a></p>
4848
4849<p>90. Camera orientation API: <a href="http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)">http://developer.android.com/reference/android/hardware/Camera.html#setDisplayOrientation(int)</a></p>
4850
4851<p>91. Camera: <a href="http://developer.android.com/reference/android/hardware/Camera.html">http://developer.android.com/reference/android/hardware/Camera.html</a></p>
4852
4853<p>92. Camera: <a href="http://developer.android.com/reference/android/hardware/Camera.Parameters.html">http://developer.android.com/reference/android/hardware/Camera.Parameters.html</a></p>
4854
4855<p>93. Camera hardware level: <a href="https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#INFO_SUPPORTED_HARDWARE_LEVEL">https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#INFO_SUPPORTED_HARDWARE_LEVEL</a> </p>
4856
4857<p>94. Camera version support: <a href="http://source.android.com/devices/camera/versioning.html">http://source.android.com/devices/camera/versioning.html</a> </p>
4858
4859<p>95. Android DownloadManager: <a href="http://developer.android.com/reference/android/app/DownloadManager.html">http://developer.android.com/reference/android/app/DownloadManager.html</a></p>
4860
4861<p>96. Android File Transfer: <a href="http://www.android.com/filetransfer">http://www.android.com/filetransfer</a></p>
4862
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4863<p>97. Android Open Accessories: <a href="http://developer.android.com/guide/topics/connectivity/usb/accessory.html">http://developer.android.com/guide/topics/connectivity/usb/accessory.html</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4864
4865<p>98. Android USB Audio: <a href="http://developer.android.com/reference/android/hardware/usb/UsbConstants.html#USB_CLASS_AUDIO">http://developer.android.com/reference/android/hardware/usb/UsbConstants.html#USB_CLASS_AUDIO</a></p>
4866
4867<p>99. USB Charging Specification: <a href="http://www.usb.org/developers/docs/devclass_docs/USB_Battery_Charging_1.2.pdf">http://www.usb.org/developers/docs/devclass_docs/USB_Battery_Charging_1.2.pdf</a></p>
4868
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4869<p>100. USB Host API:<a href="http://developer.android.com/guide/topics/connectivity/usb/host.html"> http://developer.android.com/guide/topics/connectivity/usb/host.html</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4870
4871<p>101. Wired audio headset: <a href="http://source.android.com/accessories/headset-spec.html">http://source.android.com/accessories/headset-spec.html</a> </p>
4872
4873<p>102. Android Security and Permissions reference: <a href="http://developer.android.com/guide/topics/security/permissions.html">http://developer.android.com/guide/topics/security/permissions.html</a></p>
4874
4875<p>103. UserManager reference: <a href="http://developer.android.com/reference/android/os/UserManager.html">http://developer.android.com/reference/android/os/UserManager.html</a></p>
4876
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4877<p>104. External Storage reference: <a href="http://source.android.com/devices/storage">http://source.android.com/devices/storage</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4878
4879<p>105. External Storage APIs: <a href="http://developer.android.com/reference/android/os/Environment.html">http://developer.android.com/reference/android/os/Environment.html</a></p>
4880
4881<p>106. SMS Short Code: <a href="http://en.wikipedia.org/wiki/Short_code">http://en.wikipedia.org/wiki/Short_code</a></p>
4882
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4883<p>107. Android Open Source Encryption: <a href="http://source.android.com/devices/tech/security/encryption/index.html">http://source.android.com/devices/tech/security/encryption/index.html</a></p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4884
4885<p>108. Android Compatibility Program Overview: <a href="http://source.android.com/compatibility/index.html">http://source.android.com/compatibility/index.html</a></p>
4886
4887<p>109. Android Compatibility forum: <a href="https://groups.google.com/forum/#!forum/android-compatibility">https://groups.google.com/forum/#!forum/android-compatibility</a></p>
4888
4889<p>110. WebM project: <a href="http://www.webmproject.org/">http://www.webmproject.org/</a> </p>
4890
Heidi von Markham61607242015-04-02 12:59:09 -0700[diff] [blame]4891<p>111. Android Auto feature: <a href="http://developer.android.com/reference/android/content/res/Configuration.html#UI_MODE_TYPE_CAR">http://developer.android.com/reference/android/content/res/Configuration.html#UI_MODE_TYPE_CAR</a></p>
4892
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4893<p>Many of these resources are derived directly or indirectly from the Android
Heidi von Markhamf1b1d2e2015-04-21 17:05:06 -0700[diff] [blame]4894SDK, and will be functionally identical to the information in that SDK&rsquo;s
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4895documentation. In any cases where this Compatibility Definition or the
4896Compatibility Test Suite disagrees with the SDK documentation, the SDK
4897documentation is considered authoritative. Any technical details provided in
4898the references included above are considered by inclusion to be part of this
4899Compatibility Definition.</p>
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4900
Unsuk Jungbca27492015-04-01 08:08:10 -0700[diff] [blame]4901</div>
4902</body>
Unsuk Jungff3da6d2015-05-18 09:35:24 -0700[diff] [blame]4903</html>