1 /* 2 * Copyright (C) 2009 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 android.accessibilityservice; 18 19 import android.app.Service; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.os.IBinder; 23 import android.os.Looper; 24 import android.os.Message; 25 import android.os.RemoteException; 26 import android.util.Log; 27 import android.view.accessibility.AccessibilityEvent; 28 import android.view.accessibility.AccessibilityInteractionClient; 29 import android.view.accessibility.AccessibilityNodeInfo; 30 31 import com.android.internal.os.HandlerCaller; 32 33 /** 34 * An accessibility service runs in the background and receives callbacks by the system 35 * when {@link AccessibilityEvent}s are fired. Such events denote some state transition 36 * in the user interface, for example, the focus has changed, a button has been clicked, 37 * etc. Such a service can optionally request the capability for querying the content 38 * of the active window. Development of an accessibility service requires extending this 39 * class and implementing its abstract methods. 40 * 41 * <div class="special reference"> 42 * <h3>Developer Guides</h3> 43 * <p>For more information about creating AccessibilityServices, read the 44 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 45 * developer guide.</p> 46 * </div> 47 * 48 * <h3>Lifecycle</h3> 49 * <p> 50 * The lifecycle of an accessibility service is managed exclusively by the system and 51 * follows the established service life cycle. Additionally, starting or stopping an 52 * accessibility service is triggered exclusively by an explicit user action through 53 * enabling or disabling it in the device settings. After the system binds to a service it 54 * calls {@link AccessibilityService#onServiceConnected()}. This method can be 55 * overriden by clients that want to perform post binding setup. 56 * </p> 57 * <h3>Declaration</h3> 58 * <p> 59 * An accessibility is declared as any other service in an AndroidManifest.xml but it 60 * must also specify that it handles the "android.accessibilityservice.AccessibilityService" 61 * {@link android.content.Intent}. Failure to declare this intent will cause the system to 62 * ignore the accessibility service. Additionally an accessibility service must request the 63 * {@link android.Manifest.permission#BIND_ACCESSIBILITY_SERVICE} permission to ensure 64 * that only the system 65 * can bind to it. Failure to declare this intent will cause the system to ignore the 66 * accessibility service. Following is an example declaration: 67 * </p> 68 * <pre> <service android:name=".MyAccessibilityService" 69 * android:permission="android.permission.BIND_ACCESSIBILITY_SERVICE"> 70 * <intent-filter> 71 * <action android:name="android.accessibilityservice.AccessibilityService" /> 72 * </intent-filter> 73 * . . . 74 * </service></pre> 75 * <h3>Configuration</h3> 76 * <p> 77 * An accessibility service can be configured to receive specific types of accessibility events, 78 * listen only to specific packages, get events from each type only once in a given time frame, 79 * retrieve window content, specify a settings activity, etc. 80 * </p> 81 * <p> 82 * There are two approaches for configuring an accessibility service: 83 * </p> 84 * <ul> 85 * <li> 86 * Providing a {@link #SERVICE_META_DATA meta-data} entry in the manifest when declaring 87 * the service. A service declaration with a meta-data tag is presented below: 88 * <pre> <service android:name=".MyAccessibilityService"> 89 * <intent-filter> 90 * <action android:name="android.accessibilityservice.AccessibilityService" /> 91 * </intent-filter> 92 * <meta-data android:name="android.accessibilityservice" android:resource="@xml/accessibilityservice" /> 93 * </service></pre> 94 * <p class="note"> 95 * <strong>Note:</strong> This approach enables setting all properties. 96 * </p> 97 * <p> 98 * For more details refer to {@link #SERVICE_META_DATA} and 99 * <code><{@link android.R.styleable#AccessibilityService accessibility-service}></code>. 100 * </p> 101 * </li> 102 * <li> 103 * Calling {@link AccessibilityService#setServiceInfo(AccessibilityServiceInfo)}. Note 104 * that this method can be called any time to dynamically change the service configuration. 105 * <p class="note"> 106 * <strong>Note:</strong> This approach enables setting only dynamically configurable properties: 107 * {@link AccessibilityServiceInfo#eventTypes}, 108 * {@link AccessibilityServiceInfo#feedbackType}, 109 * {@link AccessibilityServiceInfo#flags}, 110 * {@link AccessibilityServiceInfo#notificationTimeout}, 111 * {@link AccessibilityServiceInfo#packageNames} 112 * </p> 113 * <p> 114 * For more details refer to {@link AccessibilityServiceInfo}. 115 * </p> 116 * </li> 117 * </ul> 118 * <h3>Retrieving window content</h3> 119 * <p> 120 * A service can specify in its declaration that it can retrieve the active window 121 * content which is represented as a tree of {@link AccessibilityNodeInfo}. Note that 122 * declaring this capability requires that the service declares its configuration via 123 * an XML resource referenced by {@link #SERVICE_META_DATA}. 124 * </p> 125 * <p> 126 * For security purposes an accessibility service can retrieve only the content of the 127 * currently active window. The currently active window is defined as the window from 128 * which was fired the last event of the following types: 129 * {@link AccessibilityEvent#TYPE_WINDOW_STATE_CHANGED}, 130 * {@link AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}, 131 * {@link AccessibilityEvent#TYPE_VIEW_HOVER_EXIT}, 132 * In other words, the last window that was shown or the last window that the user has touched 133 * during touch exploration. 134 * </p> 135 * <p> 136 * The entry point for retrieving window content is through calling 137 * {@link AccessibilityEvent#getSource() AccessibilityEvent.getSource()} of the last received 138 * event of the above types or a previous event from the same window 139 * (see {@link AccessibilityEvent#getWindowId() AccessibilityEvent.getWindowId()}). Invoking 140 * this method will return an {@link AccessibilityNodeInfo} that can be used to traverse the 141 * window content which represented as a tree of such objects. 142 * </p> 143 * <p class="note"> 144 * <strong>Note</strong> An accessibility service may have requested to be notified for 145 * a subset of the event types, thus be unaware that the active window has changed. Therefore 146 * accessibility service that would like to retrieve window content should: 147 * <ul> 148 * <li> 149 * Register for all event types with no notification timeout and keep track for the active 150 * window by calling {@link AccessibilityEvent#getWindowId()} of the last received event and 151 * compare this with the {@link AccessibilityNodeInfo#getWindowId()} before calling retrieval 152 * methods on the latter. 153 * </li> 154 * <li> 155 * Prepare that a retrieval method on {@link AccessibilityNodeInfo} may fail since the 156 * active window has changed and the service did not get the accessibility event yet. Note 157 * that it is possible to have a retrieval method failing even adopting the strategy 158 * specified in the previous bullet because the accessibility event dispatch is asynchronous 159 * and crosses process boundaries. 160 * </li> 161 * </ul> 162 * </p> 163 * <h3>Notification strategy</h3> 164 * <p> 165 * For each feedback type only one accessibility service is notified. Services are notified 166 * in the order of registration. Hence, if two services are registered for the same 167 * feedback type in the same package the first one wins. It is possible however, to 168 * register a service as the default one for a given feedback type. In such a case this 169 * service is invoked if no other service was interested in the event. In other words, default 170 * services do not compete with other services and are notified last regardless of the 171 * registration order. This enables "generic" accessibility services that work reasonably 172 * well with most applications to coexist with "polished" ones that are targeted for 173 * specific applications. 174 * </p> 175 * <p class="note"> 176 * <strong>Note:</strong> The event notification timeout is useful to avoid propagating 177 * events to the client too frequently since this is accomplished via an expensive 178 * interprocess call. One can think of the timeout as a criteria to determine when 179 * event generation has settled down.</p> 180 * <h3>Event types</h3> 181 * <ul> 182 * <li>{@link AccessibilityEvent#TYPE_VIEW_CLICKED} 183 * <li>{@link AccessibilityEvent#TYPE_VIEW_LONG_CLICKED} 184 * <li>{@link AccessibilityEvent#TYPE_VIEW_FOCUSED} 185 * <li>{@link AccessibilityEvent#TYPE_VIEW_SELECTED} 186 * <li>{@link AccessibilityEvent#TYPE_VIEW_TEXT_CHANGED} 187 * <li>{@link AccessibilityEvent#TYPE_WINDOW_STATE_CHANGED} 188 * <li>{@link AccessibilityEvent#TYPE_NOTIFICATION_STATE_CHANGED} 189 * <li>{@link AccessibilityEvent#TYPE_TOUCH_EXPLORATION_GESTURE_START} 190 * <li>{@link AccessibilityEvent#TYPE_TOUCH_EXPLORATION_GESTURE_END} 191 * <li>{@link AccessibilityEvent#TYPE_VIEW_HOVER_ENTER} 192 * <li>{@link AccessibilityEvent#TYPE_VIEW_HOVER_EXIT} 193 * <li>{@link AccessibilityEvent#TYPE_VIEW_SCROLLED} 194 * <li>{@link AccessibilityEvent#TYPE_VIEW_TEXT_SELECTION_CHANGED} 195 * <li>{@link AccessibilityEvent#TYPE_WINDOW_CONTENT_CHANGED} 196 * </ul> 197 * <h3>Feedback types</h3> 198 * <ul> 199 * <li>{@link AccessibilityServiceInfo#FEEDBACK_AUDIBLE} 200 * <li>{@link AccessibilityServiceInfo#FEEDBACK_HAPTIC} 201 * <li>{@link AccessibilityServiceInfo#FEEDBACK_AUDIBLE} 202 * <li>{@link AccessibilityServiceInfo#FEEDBACK_VISUAL} 203 * <li>{@link AccessibilityServiceInfo#FEEDBACK_GENERIC} 204 * </ul> 205 * @see AccessibilityEvent 206 * @see AccessibilityServiceInfo 207 * @see android.view.accessibility.AccessibilityManager 208 */ 209 public abstract class AccessibilityService extends Service { 210 211 /** 212 * The user has performed a swipe up gesture on the touch screen. 213 */ 214 public static final int GESTURE_SWIPE_UP = 1; 215 216 /** 217 * The user has performed a swipe down gesture on the touch screen. 218 */ 219 public static final int GESTURE_SWIPE_DOWN = 2; 220 221 /** 222 * The user has performed a swipe left gesture on the touch screen. 223 */ 224 public static final int GESTURE_SWIPE_LEFT = 3; 225 226 /** 227 * The user has performed a swipe right gesture on the touch screen. 228 */ 229 public static final int GESTURE_SWIPE_RIGHT = 4; 230 231 /** 232 * The user has performed a swipe left and right gesture on the touch screen. 233 */ 234 public static final int GESTURE_SWIPE_LEFT_AND_RIGHT = 5; 235 236 /** 237 * The user has performed a swipe right and left gesture on the touch screen. 238 */ 239 public static final int GESTURE_SWIPE_RIGHT_AND_LEFT = 6; 240 241 /** 242 * The user has performed a swipe up and down gesture on the touch screen. 243 */ 244 public static final int GESTURE_SWIPE_UP_AND_DOWN = 7; 245 246 /** 247 * The user has performed a swipe down and up gesture on the touch screen. 248 */ 249 public static final int GESTURE_SWIPE_DOWN_AND_UP = 8; 250 251 /** 252 * The user has performed a left and up gesture on the touch screen. 253 */ 254 public static final int GESTURE_SWIPE_LEFT_AND_UP = 9; 255 256 /** 257 * The user has performed a left and down gesture on the touch screen. 258 */ 259 public static final int GESTURE_SWIPE_LEFT_AND_DOWN = 10; 260 261 /** 262 * The user has performed a right and up gesture on the touch screen. 263 */ 264 public static final int GESTURE_SWIPE_RIGHT_AND_UP = 11; 265 266 /** 267 * The user has performed a right and down gesture on the touch screen. 268 */ 269 public static final int GESTURE_SWIPE_RIGHT_AND_DOWN = 12; 270 271 /** 272 * The user has performed an up and left gesture on the touch screen. 273 */ 274 public static final int GESTURE_SWIPE_UP_AND_LEFT = 13; 275 276 /** 277 * The user has performed an up and right gesture on the touch screen. 278 */ 279 public static final int GESTURE_SWIPE_UP_AND_RIGHT = 14; 280 281 /** 282 * The user has performed an down and left gesture on the touch screen. 283 */ 284 public static final int GESTURE_SWIPE_DOWN_AND_LEFT = 15; 285 286 /** 287 * The user has performed an down and right gesture on the touch screen. 288 */ 289 public static final int GESTURE_SWIPE_DOWN_AND_RIGHT = 16; 290 291 /** 292 * The {@link Intent} that must be declared as handled by the service. 293 */ 294 public static final String SERVICE_INTERFACE = 295 "android.accessibilityservice.AccessibilityService"; 296 297 /** 298 * Name under which an AccessibilityService component publishes information 299 * about itself. This meta-data must reference an XML resource containing an 300 * <code><{@link android.R.styleable#AccessibilityService accessibility-service}></code> 301 * tag. This is a a sample XML file configuring an accessibility service: 302 * <pre> <accessibility-service 303 * android:accessibilityEventTypes="typeViewClicked|typeViewFocused" 304 * android:packageNames="foo.bar, foo.baz" 305 * android:accessibilityFeedbackType="feedbackSpoken" 306 * android:notificationTimeout="100" 307 * android:accessibilityFlags="flagDefault" 308 * android:settingsActivity="foo.bar.TestBackActivity" 309 * android:canRetrieveWindowContent="true" 310 * . . . 311 * /></pre> 312 */ 313 public static final String SERVICE_META_DATA = "android.accessibilityservice"; 314 315 /** 316 * Action to go back. 317 */ 318 public static final int GLOBAL_ACTION_BACK = 1; 319 320 /** 321 * Action to go home. 322 */ 323 public static final int GLOBAL_ACTION_HOME = 2; 324 325 /** 326 * Action to open the recent apps. 327 */ 328 public static final int GLOBAL_ACTION_RECENTS = 3; 329 330 /** 331 * Action to open the notifications. 332 */ 333 public static final int GLOBAL_ACTION_NOTIFICATIONS = 4; 334 335 /** 336 * Action to open the quick settings. 337 */ 338 public static final int GLOBAL_ACTION_QUICK_SETTINGS = 5; 339 340 private static final String LOG_TAG = "AccessibilityService"; 341 342 interface Callbacks { onAccessibilityEvent(AccessibilityEvent event)343 public void onAccessibilityEvent(AccessibilityEvent event); onInterrupt()344 public void onInterrupt(); onServiceConnected()345 public void onServiceConnected(); onSetConnectionId(int connectionId)346 public void onSetConnectionId(int connectionId); onGesture(int gestureId)347 public boolean onGesture(int gestureId); 348 } 349 350 private int mConnectionId; 351 352 private AccessibilityServiceInfo mInfo; 353 354 /** 355 * Callback for {@link android.view.accessibility.AccessibilityEvent}s. 356 * 357 * @param event An event. 358 */ onAccessibilityEvent(AccessibilityEvent event)359 public abstract void onAccessibilityEvent(AccessibilityEvent event); 360 361 /** 362 * Callback for interrupting the accessibility feedback. 363 */ onInterrupt()364 public abstract void onInterrupt(); 365 366 /** 367 * This method is a part of the {@link AccessibilityService} lifecycle and is 368 * called after the system has successfully bound to the service. If is 369 * convenient to use this method for setting the {@link AccessibilityServiceInfo}. 370 * 371 * @see AccessibilityServiceInfo 372 * @see #setServiceInfo(AccessibilityServiceInfo) 373 */ onServiceConnected()374 protected void onServiceConnected() { 375 376 } 377 378 /** 379 * Called by the system when the user performs a specific gesture on the 380 * touch screen. 381 * 382 * <strong>Note:</strong> To receive gestures an accessibility service must 383 * request that the device is in touch exploration mode by setting the 384 * {@link android.accessibilityservice.AccessibilityServiceInfo#FLAG_REQUEST_TOUCH_EXPLORATION_MODE} 385 * flag. 386 * 387 * @param gestureId The unique id of the performed gesture. 388 * 389 * @return Whether the gesture was handled. 390 * 391 * @see #GESTURE_SWIPE_UP 392 * @see #GESTURE_SWIPE_UP_AND_LEFT 393 * @see #GESTURE_SWIPE_UP_AND_DOWN 394 * @see #GESTURE_SWIPE_UP_AND_RIGHT 395 * @see #GESTURE_SWIPE_DOWN 396 * @see #GESTURE_SWIPE_DOWN_AND_LEFT 397 * @see #GESTURE_SWIPE_DOWN_AND_UP 398 * @see #GESTURE_SWIPE_DOWN_AND_RIGHT 399 * @see #GESTURE_SWIPE_LEFT 400 * @see #GESTURE_SWIPE_LEFT_AND_UP 401 * @see #GESTURE_SWIPE_LEFT_AND_RIGHT 402 * @see #GESTURE_SWIPE_LEFT_AND_DOWN 403 * @see #GESTURE_SWIPE_RIGHT 404 * @see #GESTURE_SWIPE_RIGHT_AND_UP 405 * @see #GESTURE_SWIPE_RIGHT_AND_LEFT 406 * @see #GESTURE_SWIPE_RIGHT_AND_DOWN 407 */ onGesture(int gestureId)408 protected boolean onGesture(int gestureId) { 409 return false; 410 } 411 412 /** 413 * Gets the root node in the currently active window if this service 414 * can retrieve window content. 415 * 416 * @return The root node if this service can retrieve window content. 417 */ getRootInActiveWindow()418 public AccessibilityNodeInfo getRootInActiveWindow() { 419 return AccessibilityInteractionClient.getInstance().getRootInActiveWindow(mConnectionId); 420 } 421 422 /** 423 * Performs a global action. Such an action can be performed 424 * at any moment regardless of the current application or user 425 * location in that application. For example going back, going 426 * home, opening recents, etc. 427 * 428 * @param action The action to perform. 429 * @return Whether the action was successfully performed. 430 * 431 * @see #GLOBAL_ACTION_BACK 432 * @see #GLOBAL_ACTION_HOME 433 * @see #GLOBAL_ACTION_NOTIFICATIONS 434 * @see #GLOBAL_ACTION_RECENTS 435 */ performGlobalAction(int action)436 public final boolean performGlobalAction(int action) { 437 IAccessibilityServiceConnection connection = 438 AccessibilityInteractionClient.getInstance().getConnection(mConnectionId); 439 if (connection != null) { 440 try { 441 return connection.performGlobalAction(action); 442 } catch (RemoteException re) { 443 Log.w(LOG_TAG, "Error while calling performGlobalAction", re); 444 } 445 } 446 return false; 447 } 448 449 /** 450 * Gets the an {@link AccessibilityServiceInfo} describing this 451 * {@link AccessibilityService}. This method is useful if one wants 452 * to change some of the dynamically configurable properties at 453 * runtime. 454 * 455 * @return The accessibility service info. 456 * 457 * @see AccessibilityNodeInfo 458 */ getServiceInfo()459 public final AccessibilityServiceInfo getServiceInfo() { 460 IAccessibilityServiceConnection connection = 461 AccessibilityInteractionClient.getInstance().getConnection(mConnectionId); 462 if (connection != null) { 463 try { 464 return connection.getServiceInfo(); 465 } catch (RemoteException re) { 466 Log.w(LOG_TAG, "Error while getting AccessibilityServiceInfo", re); 467 } 468 } 469 return null; 470 } 471 472 /** 473 * Sets the {@link AccessibilityServiceInfo} that describes this service. 474 * <p> 475 * Note: You can call this method any time but the info will be picked up after 476 * the system has bound to this service and when this method is called thereafter. 477 * 478 * @param info The info. 479 */ setServiceInfo(AccessibilityServiceInfo info)480 public final void setServiceInfo(AccessibilityServiceInfo info) { 481 mInfo = info; 482 sendServiceInfo(); 483 } 484 485 /** 486 * Sets the {@link AccessibilityServiceInfo} for this service if the latter is 487 * properly set and there is an {@link IAccessibilityServiceConnection} to the 488 * AccessibilityManagerService. 489 */ sendServiceInfo()490 private void sendServiceInfo() { 491 IAccessibilityServiceConnection connection = 492 AccessibilityInteractionClient.getInstance().getConnection(mConnectionId); 493 if (mInfo != null && connection != null) { 494 try { 495 connection.setServiceInfo(mInfo); 496 mInfo = null; 497 AccessibilityInteractionClient.getInstance().clearCache(); 498 } catch (RemoteException re) { 499 Log.w(LOG_TAG, "Error while setting AccessibilityServiceInfo", re); 500 } 501 } 502 } 503 504 /** 505 * Implement to return the implementation of the internal accessibility 506 * service interface. 507 */ 508 @Override onBind(Intent intent)509 public final IBinder onBind(Intent intent) { 510 return new IAccessibilityServiceClientWrapper(this, getMainLooper(), new Callbacks() { 511 @Override 512 public void onServiceConnected() { 513 AccessibilityService.this.onServiceConnected(); 514 } 515 516 @Override 517 public void onInterrupt() { 518 AccessibilityService.this.onInterrupt(); 519 } 520 521 @Override 522 public void onAccessibilityEvent(AccessibilityEvent event) { 523 AccessibilityService.this.onAccessibilityEvent(event); 524 } 525 526 @Override 527 public void onSetConnectionId( int connectionId) { 528 mConnectionId = connectionId; 529 } 530 531 @Override 532 public boolean onGesture(int gestureId) { 533 return AccessibilityService.this.onGesture(gestureId); 534 } 535 }); 536 } 537 538 /** 539 * Implements the internal {@link IAccessibilityServiceClient} interface to convert 540 * incoming calls to it back to calls on an {@link AccessibilityService}. 541 */ 542 static class IAccessibilityServiceClientWrapper extends IAccessibilityServiceClient.Stub 543 implements HandlerCaller.Callback { 544 545 static final int NO_ID = -1; 546 547 private static final int DO_SET_SET_CONNECTION = 10; 548 private static final int DO_ON_INTERRUPT = 20; 549 private static final int DO_ON_ACCESSIBILITY_EVENT = 30; 550 private static final int DO_ON_GESTURE = 40; 551 552 private final HandlerCaller mCaller; 553 554 private final Callbacks mCallback; 555 556 public IAccessibilityServiceClientWrapper(Context context, Looper looper, 557 Callbacks callback) { 558 mCallback = callback; 559 mCaller = new HandlerCaller(context, looper, this); 560 } 561 562 public void setConnection(IAccessibilityServiceConnection connection, int connectionId) { 563 Message message = mCaller.obtainMessageIO(DO_SET_SET_CONNECTION, connectionId, 564 connection); 565 mCaller.sendMessage(message); 566 } 567 568 public void onInterrupt() { 569 Message message = mCaller.obtainMessage(DO_ON_INTERRUPT); 570 mCaller.sendMessage(message); 571 } 572 573 public void onAccessibilityEvent(AccessibilityEvent event) { 574 Message message = mCaller.obtainMessageO(DO_ON_ACCESSIBILITY_EVENT, event); 575 mCaller.sendMessage(message); 576 } 577 578 public void onGesture(int gestureId) { 579 Message message = mCaller.obtainMessageI(DO_ON_GESTURE, gestureId); 580 mCaller.sendMessage(message); 581 } 582 583 public void executeMessage(Message message) { 584 switch (message.what) { 585 case DO_ON_ACCESSIBILITY_EVENT : 586 AccessibilityEvent event = (AccessibilityEvent) message.obj; 587 if (event != null) { 588 AccessibilityInteractionClient.getInstance().onAccessibilityEvent(event); 589 mCallback.onAccessibilityEvent(event); 590 event.recycle(); 591 } 592 return; 593 case DO_ON_INTERRUPT : 594 mCallback.onInterrupt(); 595 return; 596 case DO_SET_SET_CONNECTION : 597 final int connectionId = message.arg1; 598 IAccessibilityServiceConnection connection = 599 (IAccessibilityServiceConnection) message.obj; 600 if (connection != null) { 601 AccessibilityInteractionClient.getInstance().addConnection(connectionId, 602 connection); 603 mCallback.onSetConnectionId(connectionId); 604 mCallback.onServiceConnected(); 605 } else { 606 AccessibilityInteractionClient.getInstance().removeConnection(connectionId); 607 mCallback.onSetConnectionId(AccessibilityInteractionClient.NO_ID); 608 } 609 return; 610 case DO_ON_GESTURE : 611 final int gestureId = message.arg1; 612 mCallback.onGesture(gestureId); 613 return; 614 default : 615 Log.w(LOG_TAG, "Unknown message type " + message.what); 616 } 617 } 618 } 619 } 620