Zhentao Sun | c6cd1f9 | 2015-07-21 17:43:53 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2015 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package com.android.server; |
| 18 | |
| 19 | import android.app.KeyguardManager; |
| 20 | import android.content.ComponentName; |
| 21 | import android.content.Context; |
| 22 | import android.content.Intent; |
| 23 | import android.content.pm.PackageManager; |
| 24 | import android.content.pm.ResolveInfo; |
| 25 | import android.content.res.Resources; |
| 26 | import android.hardware.Sensor; |
| 27 | import android.hardware.SensorEvent; |
| 28 | import android.hardware.SensorEventListener; |
| 29 | import android.hardware.SensorManager; |
| 30 | import android.os.PowerManager; |
| 31 | import android.os.Vibrator; |
| 32 | import android.os.PowerManager.WakeLock; |
| 33 | import android.os.SystemProperties; |
| 34 | import android.provider.MediaStore; |
| 35 | import android.util.Slog; |
| 36 | |
| 37 | /** |
| 38 | * The service that listens for gestures detected in sensor firmware and starts the intent |
| 39 | * accordingly. |
| 40 | * <p>For now, only camera launch gesture is supported, and in the future, more gestures can be |
| 41 | * added.</p> |
| 42 | * @hide |
| 43 | */ |
| 44 | class GestureLauncherService extends SystemService { |
| 45 | private static final boolean DBG = false; |
| 46 | private static final String TAG = "GestureLauncherService"; |
| 47 | |
| 48 | /** The listener that receives the gesture event. */ |
| 49 | private final GestureEventListener mGestureListener = new GestureEventListener(); |
| 50 | |
| 51 | private Sensor mCameraLaunchSensor; |
| 52 | private Vibrator mVibrator; |
| 53 | private KeyguardManager mKeyGuard; |
| 54 | private Context mContext; |
| 55 | |
| 56 | /** The wake lock held when a gesture is detected. */ |
| 57 | private WakeLock mWakeLock; |
| 58 | |
| 59 | public GestureLauncherService(Context context) { |
| 60 | super(context); |
| 61 | mContext = context; |
| 62 | } |
| 63 | |
| 64 | public void onStart() { |
| 65 | // Nothing to publish. |
| 66 | } |
| 67 | |
| 68 | public void onBootPhase(int phase) { |
| 69 | if (phase == PHASE_THIRD_PARTY_APPS_CAN_START) { |
| 70 | Resources resources = mContext.getResources(); |
| 71 | if (!isGestureLauncherEnabled(resources)) { |
| 72 | if (DBG) Slog.d(TAG, "Gesture launcher is disabled in system properties."); |
| 73 | return; |
| 74 | } |
| 75 | |
| 76 | mVibrator = (Vibrator) mContext.getSystemService(Context.VIBRATOR_SERVICE); |
| 77 | mKeyGuard = (KeyguardManager) mContext.getSystemService(Context.KEYGUARD_SERVICE); |
| 78 | PowerManager powerManager = (PowerManager) mContext.getSystemService( |
| 79 | Context.POWER_SERVICE); |
| 80 | mWakeLock = powerManager.newWakeLock( |
| 81 | PowerManager.SCREEN_BRIGHT_WAKE_LOCK | PowerManager.ACQUIRE_CAUSES_WAKEUP, |
| 82 | "GestureLauncherService"); |
| 83 | if (isCameraLaunchEnabled(resources)) { |
| 84 | registerCameraLaunchGesture(resources); |
| 85 | } |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | /** |
| 90 | * Registers for the camera launch gesture. |
| 91 | */ |
| 92 | private void registerCameraLaunchGesture(Resources resources) { |
| 93 | SensorManager sensorManager = (SensorManager) mContext.getSystemService( |
| 94 | Context.SENSOR_SERVICE); |
| 95 | int cameraLaunchGestureId = resources.getInteger( |
| 96 | com.android.internal.R.integer.config_cameraLaunchGestureSensorType); |
| 97 | if (cameraLaunchGestureId != -1) { |
| 98 | boolean registered = false; |
| 99 | String sensorName = resources.getString( |
| 100 | com.android.internal.R.string.config_cameraLaunchGestureSensorStringType); |
| 101 | mCameraLaunchSensor = sensorManager.getDefaultSensor( |
| 102 | cameraLaunchGestureId, |
| 103 | true /*wakeUp*/); |
| 104 | |
| 105 | // Compare the camera gesture string type to that in the resource file to make |
| 106 | // sure we are registering the correct sensor. This is redundant check, it |
| 107 | // makes the code more robust. |
| 108 | if (mCameraLaunchSensor != null) { |
| 109 | if (sensorName.equals(mCameraLaunchSensor.getStringType())) { |
| 110 | registered = sensorManager.registerListener(mGestureListener, |
| 111 | mCameraLaunchSensor, 0); |
| 112 | } else { |
| 113 | String message = String.format("Wrong configuration. Sensor type and sensor " |
| 114 | + "string type don't match: %s in resources, %s in the sensor.", |
| 115 | sensorName, mCameraLaunchSensor.getStringType()); |
| 116 | throw new RuntimeException(message); |
| 117 | } |
| 118 | } |
| 119 | if (DBG) Slog.d(TAG, "Camera launch sensor registered: " + registered); |
| 120 | } else { |
| 121 | if (DBG) Slog.d(TAG, "Camera launch sensor is not specified."); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Whether to enable the camera launch gesture. |
| 127 | */ |
| 128 | public static boolean isCameraLaunchEnabled(Resources resources) { |
| 129 | boolean configSet = resources.getInteger( |
| 130 | com.android.internal.R.integer.config_cameraLaunchGestureSensorType) != -1; |
| 131 | return configSet && |
| 132 | !SystemProperties.getBoolean("gesture.disable_camera_launch", false); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Whether GestureLauncherService should be enabled according to system properties. |
| 137 | */ |
| 138 | public static boolean isGestureLauncherEnabled(Resources resources) { |
| 139 | // For now, the only supported gesture is camera launch gesture, so whether to enable this |
| 140 | // service equals to isCameraLaunchEnabled(); |
| 141 | return isCameraLaunchEnabled(resources); |
| 142 | } |
| 143 | |
| 144 | private final class GestureEventListener implements SensorEventListener { |
| 145 | @Override |
| 146 | public void onSensorChanged(SensorEvent event) { |
| 147 | if (event.sensor == mCameraLaunchSensor) { |
| 148 | handleCameraLaunchGesture(); |
| 149 | return; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | private void handleCameraLaunchGesture() { |
| 154 | if (DBG) Slog.d(TAG, "Received a camera launch event."); |
| 155 | boolean locked = mKeyGuard != null && mKeyGuard.inKeyguardRestrictedInputMode(); |
| 156 | String action = locked |
| 157 | ? MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA_SECURE |
| 158 | : MediaStore.INTENT_ACTION_STILL_IMAGE_CAMERA; |
| 159 | Intent intent = new Intent(action); |
| 160 | PackageManager pm = mContext.getPackageManager(); |
| 161 | ResolveInfo componentInfo = pm.resolveActivity(intent, PackageManager.MATCH_DEFAULT_ONLY); |
| 162 | if (componentInfo == null) { |
| 163 | if (DBG) Slog.d(TAG, "Couldn't find an app to process the camera intent."); |
| 164 | return; |
| 165 | } |
| 166 | |
| 167 | if (mVibrator != null && mVibrator.hasVibrator()) { |
| 168 | mVibrator.vibrate(1000L); |
| 169 | } |
| 170 | |
| 171 | // Turn on the screen before the camera launches. |
| 172 | mWakeLock.acquire(500L); |
| 173 | intent.setComponent(new ComponentName(componentInfo.activityInfo.packageName, |
| 174 | componentInfo.activityInfo.name)); |
| 175 | intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); |
| 176 | mContext.startActivity(intent); |
| 177 | mWakeLock.release(); |
| 178 | } |
| 179 | |
| 180 | @Override |
| 181 | public void onAccuracyChanged(Sensor sensor, int accuracy) { |
| 182 | // Ignored. |
| 183 | } |
| 184 | } |
| 185 | } |