Dirk Vogt | 74af2bf | 2016-05-31 11:21:46 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2012 Google Inc. |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| 5 | * use this file except in compliance with the License. You may obtain a copy of |
| 6 | * 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, WITHOUT |
| 12 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| 13 | * License for the specific language governing permissions and limitations under |
| 14 | * the License. |
| 15 | */ |
| 16 | |
| 17 | package com.fairphone.setupwizard.util; |
| 18 | |
| 19 | import android.accessibilityservice.AccessibilityServiceInfo; |
| 20 | import android.app.ActivityManager; |
| 21 | import android.content.ComponentName; |
| 22 | import android.content.ContentResolver; |
| 23 | import android.content.Context; |
| 24 | import android.content.pm.ServiceInfo; |
| 25 | import android.media.AudioManager; |
| 26 | import android.media.Ringtone; |
| 27 | import android.media.RingtoneManager; |
| 28 | import android.os.Handler; |
| 29 | import android.os.Message; |
| 30 | import android.os.RemoteException; |
| 31 | import android.os.ServiceManager; |
| 32 | import android.os.UserManager; |
| 33 | import android.provider.Settings; |
| 34 | import android.speech.tts.TextToSpeech; |
| 35 | import android.util.MathUtils; |
| 36 | import android.view.IWindowManager; |
| 37 | import android.view.MotionEvent; |
| 38 | import android.view.accessibility.AccessibilityManager; |
| 39 | import android.view.accessibility.IAccessibilityManager; |
| 40 | |
| 41 | import com.android.internal.R; |
| 42 | |
| 43 | import java.util.ArrayList; |
| 44 | import java.util.Iterator; |
| 45 | import java.util.List; |
| 46 | |
| 47 | public class EnableAccessibilityController { |
| 48 | |
| 49 | private static final int SPEAK_WARNING_DELAY_MILLIS = 5000; |
| 50 | private static final int ENABLE_ACCESSIBILITY_DELAY_MILLIS = 12000; |
| 51 | |
| 52 | public static final int MESSAGE_SPEAK_WARNING = 1; |
| 53 | public static final int MESSAGE_SPEAK_ENABLE_CANCELED = 2; |
| 54 | public static final int MESSAGE_ENABLE_ACCESSIBILITY = 3; |
| 55 | |
| 56 | private final Handler mHandler = new Handler() { |
| 57 | @Override |
| 58 | public void handleMessage(Message message) { |
| 59 | switch (message.what) { |
| 60 | case MESSAGE_SPEAK_WARNING: { |
| 61 | String text = mContext.getString(R.string.continue_to_enable_accessibility); |
| 62 | mTts.speak(text, TextToSpeech.QUEUE_FLUSH, null); |
| 63 | } break; |
| 64 | case MESSAGE_SPEAK_ENABLE_CANCELED: { |
| 65 | String text = mContext.getString(R.string.enable_accessibility_canceled); |
| 66 | mTts.speak(text, TextToSpeech.QUEUE_FLUSH, null); |
| 67 | } break; |
| 68 | case MESSAGE_ENABLE_ACCESSIBILITY: { |
| 69 | enableAccessibility(); |
| 70 | mTone.play(); |
| 71 | mTts.speak(mContext.getString(R.string.accessibility_enabled), |
| 72 | TextToSpeech.QUEUE_FLUSH, null); |
| 73 | } break; |
| 74 | } |
| 75 | } |
| 76 | }; |
| 77 | |
| 78 | private final IWindowManager mWindowManager = IWindowManager.Stub.asInterface( |
| 79 | ServiceManager.getService("window")); |
| 80 | |
| 81 | private final IAccessibilityManager mAccessibilityManager = IAccessibilityManager |
| 82 | .Stub.asInterface(ServiceManager.getService("accessibility")); |
| 83 | |
| 84 | |
| 85 | private final Context mContext; |
| 86 | private final UserManager mUserManager; |
| 87 | private final TextToSpeech mTts; |
| 88 | private final Ringtone mTone; |
| 89 | |
| 90 | private final float mTouchSlop; |
| 91 | |
| 92 | private boolean mDestroyed; |
| 93 | |
| 94 | private float mFirstPointerDownX; |
| 95 | private float mFirstPointerDownY; |
| 96 | private float mSecondPointerDownX; |
| 97 | private float mSecondPointerDownY; |
| 98 | |
| 99 | private static EnableAccessibilityController sInstance; |
| 100 | |
| 101 | private EnableAccessibilityController(Context context) { |
| 102 | mContext = context; |
| 103 | mUserManager = (UserManager) mContext.getSystemService(Context.USER_SERVICE); |
| 104 | mTts = new TextToSpeech(context, new TextToSpeech.OnInitListener() { |
| 105 | @Override |
| 106 | public void onInit(int status) { |
| 107 | if (mDestroyed) { |
| 108 | mTts.shutdown(); |
| 109 | } |
| 110 | } |
| 111 | }); |
| 112 | mTone = RingtoneManager.getRingtone(context, Settings.System.DEFAULT_NOTIFICATION_URI); |
| 113 | mTone.setStreamType(AudioManager.STREAM_MUSIC); |
| 114 | mTouchSlop = context.getResources().getDimensionPixelSize( |
| 115 | R.dimen.accessibility_touch_slop); |
| 116 | } |
| 117 | |
| 118 | public static EnableAccessibilityController getInstance(Context context) { |
| 119 | if (sInstance == null) { |
| 120 | sInstance = new EnableAccessibilityController(context); |
| 121 | } |
| 122 | return sInstance; |
| 123 | } |
| 124 | |
| 125 | public static boolean canEnableAccessibilityViaGesture(Context context) { |
| 126 | AccessibilityManager accessibilityManager = AccessibilityManager.getInstance(context); |
| 127 | // Accessibility is enabled and there is an enabled speaking |
| 128 | // accessibility service, then we have nothing to do. |
| 129 | if (accessibilityManager.isEnabled() |
| 130 | && !accessibilityManager.getEnabledAccessibilityServiceList( |
| 131 | AccessibilityServiceInfo.FEEDBACK_SPOKEN).isEmpty()) { |
| 132 | return false; |
| 133 | } |
| 134 | |
| 135 | // If there is a speaking service |
| 136 | // installed we are good to go, otherwise there is nothing to do. |
| 137 | return getInstalledSpeakingAccessibilityServices(context).isEmpty(); |
| 138 | } |
| 139 | |
| 140 | private static List<AccessibilityServiceInfo> getInstalledSpeakingAccessibilityServices( |
| 141 | Context context) { |
| 142 | List<AccessibilityServiceInfo> services = new ArrayList<AccessibilityServiceInfo>(); |
| 143 | services.addAll(AccessibilityManager.getInstance(context) |
| 144 | .getInstalledAccessibilityServiceList()); |
| 145 | Iterator<AccessibilityServiceInfo> iterator = services.iterator(); |
| 146 | while (iterator.hasNext()) { |
| 147 | AccessibilityServiceInfo service = iterator.next(); |
| 148 | if ((service.feedbackType & AccessibilityServiceInfo.FEEDBACK_SPOKEN) == 0) { |
| 149 | iterator.remove(); |
| 150 | } |
| 151 | } |
| 152 | return services; |
| 153 | } |
| 154 | |
| 155 | public void onDestroy() { |
| 156 | mDestroyed = true; |
| 157 | } |
| 158 | |
| 159 | public boolean onInterceptTouchEvent(MotionEvent event) { |
| 160 | if (event.getActionMasked() == MotionEvent.ACTION_POINTER_DOWN |
| 161 | && event.getPointerCount() == 2) { |
| 162 | mFirstPointerDownX = event.getX(0); |
| 163 | mFirstPointerDownY = event.getY(0); |
| 164 | mSecondPointerDownX = event.getX(1); |
| 165 | mSecondPointerDownY = event.getY(1); |
| 166 | mHandler.sendEmptyMessageDelayed(MESSAGE_SPEAK_WARNING, |
| 167 | SPEAK_WARNING_DELAY_MILLIS); |
| 168 | mHandler.sendEmptyMessageDelayed(MESSAGE_ENABLE_ACCESSIBILITY, |
| 169 | ENABLE_ACCESSIBILITY_DELAY_MILLIS); |
| 170 | return true; |
| 171 | } |
| 172 | return false; |
| 173 | } |
| 174 | |
| 175 | public boolean onTouchEvent(MotionEvent event) { |
| 176 | final int pointerCount = event.getPointerCount(); |
| 177 | final int action = event.getActionMasked(); |
| 178 | switch (action) { |
| 179 | case MotionEvent.ACTION_POINTER_DOWN: { |
| 180 | if (pointerCount > 2) { |
| 181 | cancel(); |
| 182 | } |
| 183 | } |
| 184 | break; |
| 185 | case MotionEvent.ACTION_MOVE: { |
| 186 | //We only care about a 2 fingered move |
| 187 | if (pointerCount < 2) { |
| 188 | cancel(); |
| 189 | return false; |
| 190 | } |
| 191 | final float firstPointerMove = MathUtils.dist(event.getX(0), |
| 192 | event.getY(0), mFirstPointerDownX, mFirstPointerDownY); |
| 193 | if (Math.abs(firstPointerMove) > mTouchSlop) { |
| 194 | cancel(); |
| 195 | } |
| 196 | final float secondPointerMove = MathUtils.dist(event.getX(1), |
| 197 | event.getY(1), mSecondPointerDownX, mSecondPointerDownY); |
| 198 | if (Math.abs(secondPointerMove) > mTouchSlop) { |
| 199 | cancel(); |
| 200 | } |
| 201 | } |
| 202 | break; |
| 203 | case MotionEvent.ACTION_POINTER_UP: |
| 204 | case MotionEvent.ACTION_CANCEL: { |
| 205 | cancel(); |
| 206 | } |
| 207 | break; |
| 208 | } |
| 209 | return true; |
| 210 | } |
| 211 | |
| 212 | private void cancel() { |
| 213 | if (mHandler.hasMessages(MESSAGE_SPEAK_WARNING)) { |
| 214 | mHandler.removeMessages(MESSAGE_SPEAK_WARNING); |
| 215 | } else if (mHandler.hasMessages(MESSAGE_ENABLE_ACCESSIBILITY)) { |
| 216 | mHandler.sendEmptyMessage(MESSAGE_SPEAK_ENABLE_CANCELED); |
| 217 | } |
| 218 | mHandler.removeMessages(MESSAGE_ENABLE_ACCESSIBILITY); |
| 219 | } |
| 220 | |
| 221 | private void enableAccessibility() { |
| 222 | List<AccessibilityServiceInfo> services = getInstalledSpeakingAccessibilityServices( |
| 223 | mContext); |
| 224 | if (services.isEmpty()) { |
| 225 | return; |
| 226 | } |
| 227 | boolean keyguardLocked = false; |
| 228 | try { |
| 229 | keyguardLocked = mWindowManager.isKeyguardLocked(); |
| 230 | } catch (RemoteException re) { |
| 231 | /* ignore */ |
| 232 | } |
| 233 | |
| 234 | final boolean hasMoreThanOneUser = mUserManager.getUsers().size() > 1; |
| 235 | |
| 236 | AccessibilityServiceInfo service = services.get(0); |
| 237 | boolean enableTouchExploration = (service.flags |
| 238 | & AccessibilityServiceInfo.FLAG_REQUEST_TOUCH_EXPLORATION_MODE) != 0; |
| 239 | // Try to find a service supporting explore by touch. |
| 240 | if (!enableTouchExploration) { |
| 241 | final int serviceCount = services.size(); |
| 242 | for (int i = 1; i < serviceCount; i++) { |
| 243 | AccessibilityServiceInfo candidate = services.get(i); |
| 244 | if ((candidate.flags & AccessibilityServiceInfo |
| 245 | .FLAG_REQUEST_TOUCH_EXPLORATION_MODE) != 0) { |
| 246 | enableTouchExploration = true; |
| 247 | service = candidate; |
| 248 | break; |
| 249 | } |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | ServiceInfo serviceInfo = service.getResolveInfo().serviceInfo; |
| 254 | ComponentName componentName = new ComponentName(serviceInfo.packageName, serviceInfo.name); |
| 255 | if (!keyguardLocked || !hasMoreThanOneUser) { |
| 256 | final int userId = ActivityManager.getCurrentUser(); |
| 257 | String enabledServiceString = componentName.flattenToString(); |
| 258 | ContentResolver resolver = mContext.getContentResolver(); |
| 259 | // Enable one speaking accessibility service. |
| 260 | Settings.Secure.putStringForUser(resolver, |
| 261 | Settings.Secure.ENABLED_ACCESSIBILITY_SERVICES, |
| 262 | enabledServiceString, userId); |
| 263 | // Allow the services we just enabled to toggle touch exploration. |
| 264 | Settings.Secure.putStringForUser(resolver, |
| 265 | Settings.Secure.TOUCH_EXPLORATION_GRANTED_ACCESSIBILITY_SERVICES, |
| 266 | enabledServiceString, userId); |
| 267 | // Enable touch exploration. |
| 268 | if (enableTouchExploration) { |
| 269 | Settings.Secure.putIntForUser(resolver, Settings.Secure.TOUCH_EXPLORATION_ENABLED, |
| 270 | 1, userId); |
| 271 | } |
| 272 | // Enable accessibility script injection (AndroidVox) for web content. |
| 273 | Settings.Secure.putIntForUser(resolver, Settings.Secure.ACCESSIBILITY_SCRIPT_INJECTION, |
| 274 | 1, userId); |
| 275 | // Turn on accessibility mode last. |
| 276 | Settings.Secure.putIntForUser(resolver, Settings.Secure.ACCESSIBILITY_ENABLED, |
| 277 | 1, userId); |
| 278 | } else if (keyguardLocked) { |
| 279 | try { |
| 280 | mAccessibilityManager.temporaryEnableAccessibilityStateUntilKeyguardRemoved( |
| 281 | componentName, enableTouchExploration); |
| 282 | } catch (RemoteException re) { |
| 283 | /* ignore */ |
| 284 | } |
| 285 | } |
| 286 | } |
| 287 | } |