2 * Copyright (C) 2009 The Android Open Source Project
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
17 package android.view.accessibility;
19 import android.os.Parcel;
20 import android.os.Parcelable;
21 import android.text.TextUtils;
22 import android.util.Pools.SynchronizedPool;
24 import java.util.ArrayList;
25 import java.util.List;
29 * This class represents accessibility events that are sent by the system when
30 * something notable happens in the user interface. For example, when a
31 * {@link android.widget.Button} is clicked, a {@link android.view.View} is focused, etc.
34 * An accessibility event is fired by an individual view which populates the event with
35 * data for its state and requests from its parent to send the event to interested
36 * parties. The parent can optionally add an {@link AccessibilityRecord} for itself before
37 * dispatching a similar request to its parent. A parent can also choose not to respect the
38 * request for sending an event. The accessibility event is sent by the topmost view in the
39 * view tree. Therefore, an {@link android.accessibilityservice.AccessibilityService} can
40 * explore all records in an accessibility event to obtain more information about the
41 * context in which the event was fired.
44 * The main purpose of an accessibility event is to expose enough information for an
45 * {@link android.accessibilityservice.AccessibilityService} to provide meaningful feedback
46 * to the user. Sometimes however, an accessibility service may need more contextual
47 * information then the one in the event pay-load. In such cases the service can obtain
48 * the event source which is an {@link AccessibilityNodeInfo} (snapshot of a View state)
49 * which can be used for exploring the window content. Note that the privilege for accessing
50 * an event's source, thus the window content, has to be explicitly requested. For more
51 * details refer to {@link android.accessibilityservice.AccessibilityService}. If an
52 * accessibility service has not requested to retrieve the window content the event will
53 * not contain reference to its source. Also for events of type
54 * {@link #TYPE_NOTIFICATION_STATE_CHANGED} the source is never available.
57 * This class represents various semantically different accessibility event
58 * types. Each event type has an associated set of related properties. In other
59 * words, each event type is characterized via a subset of the properties exposed
60 * by this class. For each event type there is a corresponding constant defined
61 * in this class. Follows a specification of the event types and their associated properties:
63 * <div class="special reference">
64 * <h3>Developer Guides</h3>
65 * <p>For more information about creating and processing AccessibilityEvents, read the
66 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a>
67 * developer guide.</p>
70 * <b>VIEW TYPES</b></br>
73 * <b>View clicked</b> - represents the event of clicking on a {@link android.view.View}
74 * like {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc.</br>
75 * <em>Type:</em>{@link #TYPE_VIEW_CLICKED}</br>
76 * <em>Properties:</em></br>
78 * <li>{@link #getEventType()} - The type of the event.</li>
79 * <li>{@link #getSource()} - The source info (for registered clients).</li>
80 * <li>{@link #getClassName()} - The class name of the source.</li>
81 * <li>{@link #getPackageName()} - The package name of the source.</li>
82 * <li>{@link #getEventTime()} - The event time.</li>
83 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
84 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
85 * <li>{@link #isPassword()} - Whether the source is password.</li>
86 * <li>{@link #isChecked()} - Whether the source is checked.</li>
87 * <li>{@link #getContentDescription()} - The content description of the source.</li>
88 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels
89 * (without descendants of AdapterView).</li>
90 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels
91 * (without descendants of AdapterView).</li>
92 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source,
93 * inclusive (for descendants of AdapterView).</li>
94 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source,
95 * inclusive (for descendants of AdapterView).</li>
96 * <li>{@link #getItemCount()} - The total items of the source
97 * (for descendants of AdapterView).</li>
101 * <b>View long clicked</b> - represents the event of long clicking on a {@link android.view.View}
102 * like {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc </br>
103 * <em>Type:</em>{@link #TYPE_VIEW_LONG_CLICKED}</br>
104 * <em>Properties:</em></br>
106 * <li>{@link #getEventType()} - The type of the event.</li>
107 * <li>{@link #getSource()} - The source info (for registered clients).</li>
108 * <li>{@link #getClassName()} - The class name of the source.</li>
109 * <li>{@link #getPackageName()} - The package name of the source.</li>
110 * <li>{@link #getEventTime()} - The event time.</li>
111 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
112 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
113 * <li>{@link #isPassword()} - Whether the source is password.</li>
114 * <li>{@link #isChecked()} - Whether the source is checked.</li>
115 * <li>{@link #getContentDescription()} - The content description of the source.</li>
116 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels
117 * (without descendants of AdapterView).</li>
118 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels
119 * (without descendants of AdapterView).</li>
120 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source,
121 * inclusive (for descendants of AdapterView).</li>
122 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source,
123 * inclusive (for descendants of AdapterView).</li>
124 * <li>{@link #getItemCount()} - The total items of the source
125 * (for descendants of AdapterView).</li>
129 * <b>View selected</b> - represents the event of selecting an item usually in
130 * the context of an {@link android.widget.AdapterView}.</br>
131 * <em>Type:</em> {@link #TYPE_VIEW_SELECTED}</br>
132 * <em>Properties:</em></br>
134 * <li>{@link #getEventType()} - The type of the event.</li>
135 * <li>{@link #getSource()} - The source info (for registered clients).</li>
136 * <li>{@link #getClassName()} - The class name of the source.</li>
137 * <li>{@link #getPackageName()} - The package name of the source.</li>
138 * <li>{@link #getEventTime()} - The event time.</li>
139 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
140 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
141 * <li>{@link #isPassword()} - Whether the source is password.</li>
142 * <li>{@link #isChecked()} - Whether the source is checked.</li>
143 * <li>{@link #getItemCount()} - The number of selectable items of the source.</li>
144 * <li>{@link #getCurrentItemIndex()} - The currently selected item index.</li>
145 * <li>{@link #getContentDescription()} - The content description of the source.</li>
146 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels
147 * (without descendants of AdapterView).</li>
148 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels
149 * (without descendants of AdapterView).</li>
150 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source,
151 * inclusive (for descendants of AdapterView).</li>
152 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source,
153 * inclusive (for descendants of AdapterView).</li>
154 * <li>{@link #getItemCount()} - The total items of the source
155 * (for descendants of AdapterView).</li>
159 * <b>View focused</b> - represents the event of focusing a
160 * {@link android.view.View}.</br>
161 * <em>Type:</em> {@link #TYPE_VIEW_FOCUSED}</br>
162 * <em>Properties:</em></br>
164 * <li>{@link #getEventType()} - The type of the event.</li>
165 * <li>{@link #getSource()} - The source info (for registered clients).</li>
166 * <li>{@link #getClassName()} - The class name of the source.</li>
167 * <li>{@link #getPackageName()} - The package name of the source.</li>
168 * <li>{@link #getEventTime()} - The event time.</li>
169 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
170 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
171 * <li>{@link #isPassword()} - Whether the source is password.</li>
172 * <li>{@link #isChecked()} - Whether the source is checked.</li>
173 * <li>{@link #getItemCount()} - The number of focusable items on the screen.</li>
174 * <li>{@link #getCurrentItemIndex()} - The currently focused item index.</li>
175 * <li>{@link #getContentDescription()} - The content description of the source.</li>
176 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels
177 * (without descendants of AdapterView).</li>
178 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels
179 * (without descendants of AdapterView).</li>
180 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source,
181 * inclusive (for descendants of AdapterView).</li>
182 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source,
183 * inclusive (for descendants of AdapterView).</li>
184 * <li>{@link #getItemCount()} - The total items of the source
185 * (for descendants of AdapterView).</li>
189 * <b>View text changed</b> - represents the event of changing the text of an
190 * {@link android.widget.EditText}.</br>
191 * <em>Type:</em> {@link #TYPE_VIEW_TEXT_CHANGED}</br>
192 * <em>Properties:</em></br>
194 * <li>{@link #getEventType()} - The type of the event.</li>
195 * <li>{@link #getSource()} - The source info (for registered clients).</li>
196 * <li>{@link #getClassName()} - The class name of the source.</li>
197 * <li>{@link #getPackageName()} - The package name of the source.</li>
198 * <li>{@link #getEventTime()} - The event time.</li>
199 * <li>{@link #getText()} - The text of the source.</li>
200 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
201 * <li>{@link #isPassword()} - Whether the source is password.</li>
202 * <li>{@link #isChecked()} - Whether the source is checked.</li>
203 * <li>{@link #getFromIndex()} - The text change start index.</li>
204 * <li>{@link #getAddedCount()} - The number of added characters.</li>
205 * <li>{@link #getRemovedCount()} - The number of removed characters.</li>
206 * <li>{@link #getBeforeText()} - The text of the source before the change.</li>
207 * <li>{@link #getContentDescription()} - The content description of the source.</li>
211 * <b>View text selection changed</b> - represents the event of changing the text
212 * selection of an {@link android.widget.EditText}.</br>
213 * <em>Type:</em> {@link #TYPE_VIEW_TEXT_SELECTION_CHANGED} </br>
214 * <em>Properties:</em></br>
216 * <li>{@link #getEventType()} - The type of the event.</li>
217 * <li>{@link #getSource()} - The source info (for registered clients).</li>
218 * <li>{@link #getClassName()} - The class name of the source.</li>
219 * <li>{@link #getPackageName()} - The package name of the source.</li>
220 * <li>{@link #getEventTime()} - The event time.</li>
221 * <li>{@link #getText()} - The text of the source.</li>
222 * <li>{@link #isPassword()} - Whether the source is password.</li>
223 * <li>{@link #getFromIndex()} - The selection start index.</li>
224 * <li>{@link #getToIndex()} - The selection end index.</li>
225 * <li>{@link #getItemCount()} - The length of the source text.</li>
226 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
227 * <li>{@link #getContentDescription()} - The content description of the source.</li>
230 * <b>View text traversed at movement granularity</b> - represents the event of traversing the
231 * text of a view at a given granularity. For example, moving to the next word.</br>
232 * <em>Type:</em> {@link #TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY} </br>
233 * <em>Properties:</em></br>
235 * <li>{@link #getEventType()} - The type of the event.</li>
236 * <li>{@link #getSource()} - The source info (for registered clients).</li>
237 * <li>{@link #getClassName()} - The class name of the source.</li>
238 * <li>{@link #getPackageName()} - The package name of the source.</li>
239 * <li>{@link #getEventTime()} - The event time.</li>
240 * <li>{@link #getMovementGranularity()} - Sets the granularity at which a view's text
241 * was traversed.</li>
242 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
243 * <li>{@link #getFromIndex()} - The start the text that was skipped over in this movement.
244 * This is the starting point when moving forward through the text, but not when moving
246 * <li>{@link #getToIndex()} - The end of the text that was skipped over in this movement.
247 * This is the ending point when moving forward through the text, but not when moving
249 * <li>{@link #isPassword()} - Whether the source is password.</li>
250 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
251 * <li>{@link #getContentDescription()} - The content description of the source.</li>
252 * <li>{@link #getMovementGranularity()} - Sets the granularity at which a view's text
253 * was traversed.</li>
254 * <li>{@link #getAction()} - Gets traversal action which specifies the direction.</li>
258 * <b>View scrolled</b> - represents the event of scrolling a view. If
259 * the source is a descendant of {@link android.widget.AdapterView} the
260 * scroll is reported in terms of visible items - the first visible item,
261 * the last visible item, and the total items - because the the source
262 * is unaware of its pixel size since its adapter is responsible for
263 * creating views. In all other cases the scroll is reported as the current
264 * scroll on the X and Y axis respectively plus the height of the source in
266 * <em>Type:</em> {@link #TYPE_VIEW_SCROLLED}</br>
267 * <em>Properties:</em></br>
269 * <li>{@link #getEventType()} - The type of the event.</li>
270 * <li>{@link #getSource()} - The source info (for registered clients).</li>
271 * <li>{@link #getClassName()} - The class name of the source.</li>
272 * <li>{@link #getPackageName()} - The package name of the source.</li>
273 * <li>{@link #getEventTime()} - The event time.</li>
274 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
275 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
276 * <li>{@link #getContentDescription()} - The content description of the source.</li>
277 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels
278 * (without descendants of AdapterView).</li>
279 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels
280 * (without descendants of AdapterView).</li>
281 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source,
282 * inclusive (for descendants of AdapterView).</li>
283 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source,
284 * inclusive (for descendants of AdapterView).</li>
285 * <li>{@link #getItemCount()} - The total items of the source
286 * (for descendants of AdapterView).</li>
288 * <em>Note:</em> This event type is not dispatched to descendants though
289 * {@link android.view.View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
290 * View.dispatchPopulateAccessibilityEvent(AccessibilityEvent)}, hence the event
291 * source {@link android.view.View} and the sub-tree rooted at it will not receive
292 * calls to {@link android.view.View#onPopulateAccessibilityEvent(AccessibilityEvent)
293 * View.onPopulateAccessibilityEvent(AccessibilityEvent)}. The preferred way to add
294 * text content to such events is by setting the
295 * {@link android.R.styleable#View_contentDescription contentDescription} of the source
299 * <b>TRANSITION TYPES</b></br>
302 * <b>Window state changed</b> - represents the event of opening a
303 * {@link android.widget.PopupWindow}, {@link android.view.Menu},
304 * {@link android.app.Dialog}, etc.</br>
305 * <em>Type:</em> {@link #TYPE_WINDOW_STATE_CHANGED}</br>
306 * <em>Properties:</em></br>
308 * <li>{@link #getEventType()} - The type of the event.</li>
309 * <li>{@link #getSource()} - The source info (for registered clients).</li>
310 * <li>{@link #getClassName()} - The class name of the source.</li>
311 * <li>{@link #getPackageName()} - The package name of the source.</li>
312 * <li>{@link #getEventTime()} - The event time.</li>
313 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
314 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
318 * <b>Window content changed</b> - represents the event of change in the
319 * content of a window. This change can be adding/removing view, changing
320 * a view size, etc.</br>
323 * <strong>Note:</strong> This event is fired only for the window source of the
324 * last accessibility event different from {@link #TYPE_NOTIFICATION_STATE_CHANGED}
325 * and its purpose is to notify clients that the content of the user interaction
326 * window has changed.</br>
327 * <em>Type:</em> {@link #TYPE_WINDOW_CONTENT_CHANGED}</br>
328 * <em>Properties:</em></br>
330 * <li>{@link #getEventType()} - The type of the event.</li>
331 * <li>{@link #getContentChangeTypes()} - The type of content changes.</li>
332 * <li>{@link #getSource()} - The source info (for registered clients).</li>
333 * <li>{@link #getClassName()} - The class name of the source.</li>
334 * <li>{@link #getPackageName()} - The package name of the source.</li>
335 * <li>{@link #getEventTime()} - The event time.</li>
337 * <em>Note:</em> This event type is not dispatched to descendants though
338 * {@link android.view.View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)
339 * View.dispatchPopulateAccessibilityEvent(AccessibilityEvent)}, hence the event
340 * source {@link android.view.View} and the sub-tree rooted at it will not receive
341 * calls to {@link android.view.View#onPopulateAccessibilityEvent(AccessibilityEvent)
342 * View.onPopulateAccessibilityEvent(AccessibilityEvent)}. The preferred way to add
343 * text content to such events is by setting the
344 * {@link android.R.styleable#View_contentDescription contentDescription} of the source
348 * <b>Windows changed</b> - represents the event of changes in the windows shown on
349 * the screen such as a window appeared, a window disappeared, a window size changed,
350 * a window layer changed, etc.</br>
351 * <em>Type:</em> {@link #TYPE_WINDOWS_CHANGED}</br>
352 * <em>Properties:</em></br>
354 * <li>{@link #getEventType()} - The type of the event.</li>
355 * <li>{@link #getEventTime()} - The event time.</li>
357 * <em>Note:</em> You can retrieve the {@link AccessibilityWindowInfo} for the window
358 * source of the event via {@link AccessibilityEvent#getSource()} to get the source
359 * node on which then call {@link AccessibilityNodeInfo#getWindow()
360 * AccessibilityNodeInfo.getWindow()} to get the window. Also all windows on the screen can
361 * be retrieved by a call to {@link android.accessibilityservice.AccessibilityService#getWindows()
362 * android.accessibilityservice.AccessibilityService.getWindows()}.
365 * <b>NOTIFICATION TYPES</b></br>
368 * <b>Notification state changed</b> - represents the event showing a transient piece of information
369 * to the user. This information may be a {@link android.app.Notification} or
370 * {@link android.widget.Toast}.</br>
371 * <em>Type:</em> {@link #TYPE_NOTIFICATION_STATE_CHANGED}</br>
372 * <em>Properties:</em></br>
374 * <li>{@link #getEventType()} - The type of the event.</li>
375 * <li>{@link #getClassName()} - The class name of the source.</li>
376 * <li>{@link #getPackageName()} - The package name of the source.</li>
377 * <li>{@link #getEventTime()} - The event time.</li>
378 * <li>{@link #getParcelableData()} - The posted {@link android.app.Notification}, if
380 * <li>{@link #getText()} - Displayed text of the {@link android.widget.Toast}, if applicable,
381 * or may contain text from the {@link android.app.Notification}, although
382 * {@link #getParcelableData()} is a richer set of data for {@link android.app.Notification}.</li>
386 * <b>EXPLORATION TYPES</b></br>
389 * <b>View hover enter</b> - represents the event of beginning to hover
390 * over a {@link android.view.View}. The hover may be generated via
391 * exploring the screen by touch or via a pointing device.</br>
392 * <em>Type:</em> {@link #TYPE_VIEW_HOVER_ENTER}</br>
393 * <em>Properties:</em></br>
395 * <li>{@link #getEventType()} - The type of the event.</li>
396 * <li>{@link #getSource()} - The source info (for registered clients).</li>
397 * <li>{@link #getClassName()} - The class name of the source.</li>
398 * <li>{@link #getPackageName()} - The package name of the source.</li>
399 * <li>{@link #getEventTime()} - The event time.</li>
400 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
401 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
402 * <li>{@link #getContentDescription()} - The content description of the source.</li>
403 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels
404 * (without descendants of AdapterView).</li>
405 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels
406 * (without descendants of AdapterView).</li>
407 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source,
408 * inclusive (for descendants of AdapterView).</li>
409 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source,
410 * inclusive (for descendants of AdapterView).</li>
411 * <li>{@link #getItemCount()} - The total items of the source
412 * (for descendants of AdapterView).</li>
415 * <b>View hover exit</b> - represents the event of stopping to hover
416 * over a {@link android.view.View}. The hover may be generated via
417 * exploring the screen by touch or via a pointing device.</br>
418 * <em>Type:</em> {@link #TYPE_VIEW_HOVER_EXIT}</br>
419 * <em>Properties:</em></br>
421 * <li>{@link #getEventType()} - The type of the event.</li>
422 * <li>{@link #getSource()} - The source info (for registered clients).</li>
423 * <li>{@link #getClassName()} - The class name of the source.</li>
424 * <li>{@link #getPackageName()} - The package name of the source.</li>
425 * <li>{@link #getEventTime()} - The event time.</li>
426 * <li>{@link #getText()} - The text of the source's sub-tree.</li>
427 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
428 * <li>{@link #getContentDescription()} - The content description of the source.</li>
429 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels
430 * (without descendants of AdapterView).</li>
431 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels
432 * (without descendants of AdapterView).</li>
433 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source,
434 * inclusive (for descendants of AdapterView).</li>
435 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source,
436 * inclusive (for descendants of AdapterView).</li>
437 * <li>{@link #getItemCount()} - The total items of the source
438 * (for descendants of AdapterView).</li>
442 * <b>Touch interaction start</b> - represents the event of starting a touch
443 * interaction, which is the user starts touching the screen.</br>
444 * <em>Type:</em> {@link #TYPE_TOUCH_INTERACTION_START}</br>
445 * <em>Properties:</em></br>
447 * <li>{@link #getEventType()} - The type of the event.</li>
449 * <em>Note:</em> This event is fired only by the system and is not passed to the
450 * view tree to be populated.</br>
453 * <b>Touch interaction end</b> - represents the event of ending a touch
454 * interaction, which is the user stops touching the screen.</br>
455 * <em>Type:</em> {@link #TYPE_TOUCH_INTERACTION_END}</br>
456 * <em>Properties:</em></br>
458 * <li>{@link #getEventType()} - The type of the event.</li>
460 * <em>Note:</em> This event is fired only by the system and is not passed to the
461 * view tree to be populated.</br>
464 * <b>Touch exploration gesture start</b> - represents the event of starting a touch
465 * exploring gesture.</br>
466 * <em>Type:</em> {@link #TYPE_TOUCH_EXPLORATION_GESTURE_START}</br>
467 * <em>Properties:</em></br>
469 * <li>{@link #getEventType()} - The type of the event.</li>
471 * <em>Note:</em> This event is fired only by the system and is not passed to the
472 * view tree to be populated.</br>
475 * <b>Touch exploration gesture end</b> - represents the event of ending a touch
476 * exploring gesture.</br>
477 * <em>Type:</em> {@link #TYPE_TOUCH_EXPLORATION_GESTURE_END}</br>
478 * <em>Properties:</em></br>
480 * <li>{@link #getEventType()} - The type of the event.</li>
482 * <em>Note:</em> This event is fired only by the system and is not passed to the
483 * view tree to be populated.</br>
486 * <b>Touch gesture detection start</b> - represents the event of starting a user
487 * gesture detection.</br>
488 * <em>Type:</em> {@link #TYPE_GESTURE_DETECTION_START}</br>
489 * <em>Properties:</em></br>
491 * <li>{@link #getEventType()} - The type of the event.</li>
493 * <em>Note:</em> This event is fired only by the system and is not passed to the
494 * view tree to be populated.</br>
497 * <b>Touch gesture detection end</b> - represents the event of ending a user
498 * gesture detection.</br>
499 * <em>Type:</em> {@link #TYPE_GESTURE_DETECTION_END}</br>
500 * <em>Properties:</em></br>
502 * <li>{@link #getEventType()} - The type of the event.</li>
504 * <em>Note:</em> This event is fired only by the system and is not passed to the
505 * view tree to be populated.</br>
508 * <b>MISCELLANEOUS TYPES</b></br>
511 * <b>Announcement</b> - represents the event of an application making an
512 * announcement. Usually this announcement is related to some sort of a context
513 * change for which none of the events representing UI transitions is a good fit.
514 * For example, announcing a new page in a book.</br>
515 * <em>Type:</em> {@link #TYPE_ANNOUNCEMENT}</br>
516 * <em>Properties:</em></br>
518 * <li>{@link #getEventType()} - The type of the event.</li>
519 * <li>{@link #getSource()} - The source info (for registered clients).</li>
520 * <li>{@link #getClassName()} - The class name of the source.</li>
521 * <li>{@link #getPackageName()} - The package name of the source.</li>
522 * <li>{@link #getEventTime()} - The event time.</li>
523 * <li>{@link #getText()} - The text of the announcement.</li>
524 * <li>{@link #isEnabled()} - Whether the source is enabled.</li>
528 * @see android.view.accessibility.AccessibilityManager
529 * @see android.accessibilityservice.AccessibilityService
530 * @see AccessibilityNodeInfo
532 public final class AccessibilityEvent extends AccessibilityRecord implements Parcelable {
533 private static final boolean DEBUG = false;
536 * Invalid selection/focus position.
538 * @see #getCurrentItemIndex()
540 public static final int INVALID_POSITION = -1;
543 * Maximum length of the text fields.
545 * @see #getBeforeText()
548 * Note: This constant is no longer needed since there
549 * is no limit on the length of text that is contained
550 * in an accessibility event anymore.
553 public static final int MAX_TEXT_LENGTH = 500;
556 * Represents the event of clicking on a {@link android.view.View} like
557 * {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc.
559 public static final int TYPE_VIEW_CLICKED = 0x00000001;
562 * Represents the event of long clicking on a {@link android.view.View} like
563 * {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc.
565 public static final int TYPE_VIEW_LONG_CLICKED = 0x00000002;
568 * Represents the event of selecting an item usually in the context of an
569 * {@link android.widget.AdapterView}.
571 public static final int TYPE_VIEW_SELECTED = 0x00000004;
574 * Represents the event of setting input focus of a {@link android.view.View}.
576 public static final int TYPE_VIEW_FOCUSED = 0x00000008;
579 * Represents the event of changing the text of an {@link android.widget.EditText}.
581 public static final int TYPE_VIEW_TEXT_CHANGED = 0x00000010;
584 * Represents the event of opening a {@link android.widget.PopupWindow},
585 * {@link android.view.Menu}, {@link android.app.Dialog}, etc.
587 public static final int TYPE_WINDOW_STATE_CHANGED = 0x00000020;
590 * Represents the event showing a {@link android.app.Notification}.
592 public static final int TYPE_NOTIFICATION_STATE_CHANGED = 0x00000040;
595 * Represents the event of a hover enter over a {@link android.view.View}.
597 public static final int TYPE_VIEW_HOVER_ENTER = 0x00000080;
600 * Represents the event of a hover exit over a {@link android.view.View}.
602 public static final int TYPE_VIEW_HOVER_EXIT = 0x00000100;
605 * Represents the event of starting a touch exploration gesture.
607 public static final int TYPE_TOUCH_EXPLORATION_GESTURE_START = 0x00000200;
610 * Represents the event of ending a touch exploration gesture.
612 public static final int TYPE_TOUCH_EXPLORATION_GESTURE_END = 0x00000400;
615 * Represents the event of changing the content of a window and more
616 * specifically the sub-tree rooted at the event's source.
618 public static final int TYPE_WINDOW_CONTENT_CHANGED = 0x00000800;
621 * Represents the event of scrolling a view. This event type is generally not sent directly.
622 * @see View#onScrollChanged(int, int, int, int)
624 public static final int TYPE_VIEW_SCROLLED = 0x00001000;
627 * Represents the event of changing the selection in an {@link android.widget.EditText}.
629 public static final int TYPE_VIEW_TEXT_SELECTION_CHANGED = 0x00002000;
632 * Represents the event of an application making an announcement.
634 public static final int TYPE_ANNOUNCEMENT = 0x00004000;
637 * Represents the event of gaining accessibility focus.
639 public static final int TYPE_VIEW_ACCESSIBILITY_FOCUSED = 0x00008000;
642 * Represents the event of clearing accessibility focus.
644 public static final int TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED = 0x00010000;
647 * Represents the event of traversing the text of a view at a given movement granularity.
649 public static final int TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY = 0x00020000;
652 * Represents the event of beginning gesture detection.
654 public static final int TYPE_GESTURE_DETECTION_START = 0x00040000;
657 * Represents the event of ending gesture detection.
659 public static final int TYPE_GESTURE_DETECTION_END = 0x00080000;
662 * Represents the event of the user starting to touch the screen.
664 public static final int TYPE_TOUCH_INTERACTION_START = 0x00100000;
667 * Represents the event of the user ending to touch the screen.
669 public static final int TYPE_TOUCH_INTERACTION_END = 0x00200000;
672 * Represents the event change in the windows shown on the screen.
674 public static final int TYPE_WINDOWS_CHANGED = 0x00400000;
677 * Represents the event of a context click on a {@link android.view.View}.
679 public static final int TYPE_VIEW_CONTEXT_CLICKED = 0x00800000;
682 * Represents the event of the assistant currently reading the users screen context.
684 public static final int TYPE_ASSIST_READING_CONTEXT = 0x01000000;
687 * Change type for {@link #TYPE_WINDOW_CONTENT_CHANGED} event:
688 * The type of change is not defined.
690 public static final int CONTENT_CHANGE_TYPE_UNDEFINED = 0x00000000;
693 * Change type for {@link #TYPE_WINDOW_CONTENT_CHANGED} event:
694 * A node in the subtree rooted at the source node was added or removed.
696 public static final int CONTENT_CHANGE_TYPE_SUBTREE = 0x00000001;
699 * Change type for {@link #TYPE_WINDOW_CONTENT_CHANGED} event:
700 * The node's text changed.
702 public static final int CONTENT_CHANGE_TYPE_TEXT = 0x00000002;
705 * Change type for {@link #TYPE_WINDOW_CONTENT_CHANGED} event:
706 * The node's content description changed.
708 public static final int CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION = 0x00000004;
711 * Mask for {@link AccessibilityEvent} all types.
713 * @see #TYPE_VIEW_CLICKED
714 * @see #TYPE_VIEW_LONG_CLICKED
715 * @see #TYPE_VIEW_SELECTED
716 * @see #TYPE_VIEW_FOCUSED
717 * @see #TYPE_VIEW_TEXT_CHANGED
718 * @see #TYPE_WINDOW_STATE_CHANGED
719 * @see #TYPE_NOTIFICATION_STATE_CHANGED
720 * @see #TYPE_VIEW_HOVER_ENTER
721 * @see #TYPE_VIEW_HOVER_EXIT
722 * @see #TYPE_TOUCH_EXPLORATION_GESTURE_START
723 * @see #TYPE_TOUCH_EXPLORATION_GESTURE_END
724 * @see #TYPE_WINDOW_CONTENT_CHANGED
725 * @see #TYPE_VIEW_SCROLLED
726 * @see #TYPE_VIEW_TEXT_SELECTION_CHANGED
727 * @see #TYPE_ANNOUNCEMENT
728 * @see #TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY
729 * @see #TYPE_GESTURE_DETECTION_START
730 * @see #TYPE_GESTURE_DETECTION_END
731 * @see #TYPE_TOUCH_INTERACTION_START
732 * @see #TYPE_TOUCH_INTERACTION_END
733 * @see #TYPE_WINDOWS_CHANGED
734 * @see #TYPE_VIEW_CONTEXT_CLICKED
736 public static final int TYPES_ALL_MASK = 0xFFFFFFFF;
738 private static final int MAX_POOL_SIZE = 10;
739 private static final SynchronizedPool<AccessibilityEvent> sPool =
740 new SynchronizedPool<AccessibilityEvent>(MAX_POOL_SIZE);
742 private int mEventType;
743 private CharSequence mPackageName;
744 private long mEventTime;
745 int mMovementGranularity;
747 int mContentChangeTypes;
749 private ArrayList<AccessibilityRecord> mRecords;
752 * Hide constructor from clients.
754 private AccessibilityEvent() {
758 * Initialize an event from another one.
760 * @param event The event to initialize from.
762 void init(AccessibilityEvent event) {
764 mEventType = event.mEventType;
765 mMovementGranularity = event.mMovementGranularity;
766 mAction = event.mAction;
767 mContentChangeTypes = event.mContentChangeTypes;
768 mEventTime = event.mEventTime;
769 mPackageName = event.mPackageName;
773 * Sets if this instance is sealed.
775 * @param sealed Whether is sealed.
780 public void setSealed(boolean sealed) {
781 super.setSealed(sealed);
782 final List<AccessibilityRecord> records = mRecords;
783 if (records != null) {
784 final int recordCount = records.size();
785 for (int i = 0; i < recordCount; i++) {
786 AccessibilityRecord record = records.get(i);
787 record.setSealed(sealed);
793 * Gets the number of records contained in the event.
795 * @return The number of records.
797 public int getRecordCount() {
798 return mRecords == null ? 0 : mRecords.size();
802 * Appends an {@link AccessibilityRecord} to the end of event records.
804 * @param record The record to append.
806 * @throws IllegalStateException If called from an AccessibilityService.
808 public void appendRecord(AccessibilityRecord record) {
810 if (mRecords == null) {
811 mRecords = new ArrayList<AccessibilityRecord>();
813 mRecords.add(record);
817 * Gets the record at a given index.
819 * @param index The index.
820 * @return The record at the specified index.
822 public AccessibilityRecord getRecord(int index) {
823 if (mRecords == null) {
824 throw new IndexOutOfBoundsException("Invalid index " + index + ", size is 0");
826 return mRecords.get(index);
830 * Gets the event type.
832 * @return The event type.
834 public int getEventType() {
839 * Gets the bit mask of change types signaled by an
840 * {@link #TYPE_WINDOW_CONTENT_CHANGED} event. A single event may represent
841 * multiple change types.
843 * @return The bit mask of change types. One or more of:
845 * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_CONTENT_DESCRIPTION}
846 * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_SUBTREE}
847 * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_TEXT}
848 * <li>{@link AccessibilityEvent#CONTENT_CHANGE_TYPE_UNDEFINED}
851 public int getContentChangeTypes() {
852 return mContentChangeTypes;
856 * Sets the bit mask of node tree changes signaled by an
857 * {@link #TYPE_WINDOW_CONTENT_CHANGED} event.
859 * @param changeTypes The bit mask of change types.
860 * @throws IllegalStateException If called from an AccessibilityService.
861 * @see #getContentChangeTypes()
863 public void setContentChangeTypes(int changeTypes) {
865 mContentChangeTypes = changeTypes;
869 * Sets the event type.
871 * @param eventType The event type.
873 * @throws IllegalStateException If called from an AccessibilityService.
875 public void setEventType(int eventType) {
877 mEventType = eventType;
881 * Gets the time in which this event was sent.
883 * @return The event time.
885 public long getEventTime() {
890 * Sets the time in which this event was sent.
892 * @param eventTime The event time.
894 * @throws IllegalStateException If called from an AccessibilityService.
896 public void setEventTime(long eventTime) {
898 mEventTime = eventTime;
902 * Gets the package name of the source.
904 * @return The package name.
906 public CharSequence getPackageName() {
911 * Sets the package name of the source.
913 * @param packageName The package name.
915 * @throws IllegalStateException If called from an AccessibilityService.
917 public void setPackageName(CharSequence packageName) {
919 mPackageName = packageName;
923 * Sets the movement granularity that was traversed.
925 * @param granularity The granularity.
927 * @throws IllegalStateException If called from an AccessibilityService.
929 public void setMovementGranularity(int granularity) {
931 mMovementGranularity = granularity;
935 * Gets the movement granularity that was traversed.
937 * @return The granularity.
939 public int getMovementGranularity() {
940 return mMovementGranularity;
944 * Sets the performed action that triggered this event.
946 * Valid actions are defined in {@link AccessibilityNodeInfo}:
948 * <li>{@link AccessibilityNodeInfo#ACTION_ACCESSIBILITY_FOCUS}
949 * <li>{@link AccessibilityNodeInfo#ACTION_CLEAR_ACCESSIBILITY_FOCUS}
950 * <li>{@link AccessibilityNodeInfo#ACTION_CLEAR_FOCUS}
951 * <li>{@link AccessibilityNodeInfo#ACTION_CLEAR_SELECTION}
952 * <li>{@link AccessibilityNodeInfo#ACTION_CLICK}
956 * @param action The action.
957 * @throws IllegalStateException If called from an AccessibilityService.
958 * @see AccessibilityNodeInfo#performAction(int)
960 public void setAction(int action) {
966 * Gets the performed action that triggered this event.
968 * @return The action.
970 public int getAction() {
975 * Returns a cached instance if such is available or a new one is
976 * instantiated with its type property set.
978 * @param eventType The event type.
979 * @return An instance.
981 public static AccessibilityEvent obtain(int eventType) {
982 AccessibilityEvent event = AccessibilityEvent.obtain();
983 event.setEventType(eventType);
988 * Returns a cached instance if such is available or a new one is
989 * created. The returned instance is initialized from the given
990 * <code>event</code>.
992 * @param event The other event.
993 * @return An instance.
995 public static AccessibilityEvent obtain(AccessibilityEvent event) {
996 AccessibilityEvent eventClone = AccessibilityEvent.obtain();
997 eventClone.init(event);
999 if (event.mRecords != null) {
1000 final int recordCount = event.mRecords.size();
1001 eventClone.mRecords = new ArrayList<AccessibilityRecord>(recordCount);
1002 for (int i = 0; i < recordCount; i++) {
1003 final AccessibilityRecord record = event.mRecords.get(i);
1004 final AccessibilityRecord recordClone = AccessibilityRecord.obtain(record);
1005 eventClone.mRecords.add(recordClone);
1013 * Returns a cached instance if such is available or a new one is
1016 * @return An instance.
1018 public static AccessibilityEvent obtain() {
1019 AccessibilityEvent event = sPool.acquire();
1020 return (event != null) ? event : new AccessibilityEvent();
1024 * Recycles an instance back to be reused.
1026 * <b>Note: You must not touch the object after calling this function.</b>
1029 * @throws IllegalStateException If the event is already recycled.
1032 public void recycle() {
1034 sPool.release(this);
1038 * Clears the state of this instance.
1043 protected void clear() {
1046 mMovementGranularity = 0;
1048 mContentChangeTypes = 0;
1049 mPackageName = null;
1051 if (mRecords != null) {
1052 while (!mRecords.isEmpty()) {
1053 AccessibilityRecord record = mRecords.remove(0);
1060 * Creates a new instance from a {@link Parcel}.
1062 * @param parcel A parcel containing the state of a {@link AccessibilityEvent}.
1064 public void initFromParcel(Parcel parcel) {
1065 mSealed = (parcel.readInt() == 1);
1066 mEventType = parcel.readInt();
1067 mMovementGranularity = parcel.readInt();
1068 mAction = parcel.readInt();
1069 mContentChangeTypes = parcel.readInt();
1070 mPackageName = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel);
1071 mEventTime = parcel.readLong();
1072 mConnectionId = parcel.readInt();
1073 readAccessibilityRecordFromParcel(this, parcel);
1075 // Read the records.
1076 final int recordCount = parcel.readInt();
1077 if (recordCount > 0) {
1078 mRecords = new ArrayList<AccessibilityRecord>(recordCount);
1079 for (int i = 0; i < recordCount; i++) {
1080 AccessibilityRecord record = AccessibilityRecord.obtain();
1081 readAccessibilityRecordFromParcel(record, parcel);
1082 record.mConnectionId = mConnectionId;
1083 mRecords.add(record);
1089 * Reads an {@link AccessibilityRecord} from a parcel.
1091 * @param record The record to initialize.
1092 * @param parcel The parcel to read from.
1094 private void readAccessibilityRecordFromParcel(AccessibilityRecord record,
1096 record.mBooleanProperties = parcel.readInt();
1097 record.mCurrentItemIndex = parcel.readInt();
1098 record.mItemCount = parcel.readInt();
1099 record.mFromIndex = parcel.readInt();
1100 record.mToIndex = parcel.readInt();
1101 record.mScrollX = parcel.readInt();
1102 record.mScrollY = parcel.readInt();
1103 record.mMaxScrollX = parcel.readInt();
1104 record.mMaxScrollY = parcel.readInt();
1105 record.mAddedCount = parcel.readInt();
1106 record.mRemovedCount = parcel.readInt();
1107 record.mClassName = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel);
1108 record.mContentDescription = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel);
1109 record.mBeforeText = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel);
1110 record.mParcelableData = parcel.readParcelable(null);
1111 parcel.readList(record.mText, null);
1112 record.mSourceWindowId = parcel.readInt();
1113 record.mSourceNode = parcel.readParcelable(null);
1114 record.mSealed = (parcel.readInt() == 1);
1120 public void writeToParcel(Parcel parcel, int flags) {
1121 parcel.writeInt(isSealed() ? 1 : 0);
1122 parcel.writeInt(mEventType);
1123 parcel.writeInt(mMovementGranularity);
1124 parcel.writeInt(mAction);
1125 parcel.writeInt(mContentChangeTypes);
1126 TextUtils.writeToParcel(mPackageName, parcel, 0);
1127 parcel.writeLong(mEventTime);
1128 parcel.writeInt(mConnectionId);
1129 writeAccessibilityRecordToParcel(this, parcel, flags);
1131 // Write the records.
1132 final int recordCount = getRecordCount();
1133 parcel.writeInt(recordCount);
1134 for (int i = 0; i < recordCount; i++) {
1135 AccessibilityRecord record = mRecords.get(i);
1136 writeAccessibilityRecordToParcel(record, parcel, flags);
1141 * Writes an {@link AccessibilityRecord} to a parcel.
1143 * @param record The record to write.
1144 * @param parcel The parcel to which to write.
1146 private void writeAccessibilityRecordToParcel(AccessibilityRecord record, Parcel parcel,
1148 parcel.writeInt(record.mBooleanProperties);
1149 parcel.writeInt(record.mCurrentItemIndex);
1150 parcel.writeInt(record.mItemCount);
1151 parcel.writeInt(record.mFromIndex);
1152 parcel.writeInt(record.mToIndex);
1153 parcel.writeInt(record.mScrollX);
1154 parcel.writeInt(record.mScrollY);
1155 parcel.writeInt(record.mMaxScrollX);
1156 parcel.writeInt(record.mMaxScrollY);
1157 parcel.writeInt(record.mAddedCount);
1158 parcel.writeInt(record.mRemovedCount);
1159 TextUtils.writeToParcel(record.mClassName, parcel, flags);
1160 TextUtils.writeToParcel(record.mContentDescription, parcel, flags);
1161 TextUtils.writeToParcel(record.mBeforeText, parcel, flags);
1162 parcel.writeParcelable(record.mParcelableData, flags);
1163 parcel.writeList(record.mText);
1164 parcel.writeInt(record.mSourceWindowId);
1165 // create copy of the node here because the node would be recycled just after it is written
1167 parcel.writeParcelable(record.mSourceNode != null ?
1168 AccessibilityNodeInfo.obtain(record.mSourceNode) : null, flags);
1169 parcel.writeInt(record.mSealed ? 1 : 0);
1175 public int describeContents() {
1180 public String toString() {
1181 StringBuilder builder = new StringBuilder();
1182 builder.append("EventType: ").append(eventTypeToString(mEventType));
1183 builder.append("; EventTime: ").append(mEventTime);
1184 builder.append("; PackageName: ").append(mPackageName);
1185 builder.append("; MovementGranularity: ").append(mMovementGranularity);
1186 builder.append("; Action: ").append(mAction);
1187 builder.append(super.toString());
1189 builder.append("\n");
1190 builder.append("; ContentChangeTypes: ").append(mContentChangeTypes);
1191 builder.append("; sourceWindowId: ").append(mSourceWindowId);
1192 if (mSourceNode != null) {
1193 builder.append("; mSourceNodeId: ").append(mSourceNode.getSourceNodeId());
1195 for (int i = 0; i < getRecordCount(); i++) {
1196 final AccessibilityRecord record = getRecord(i);
1197 builder.append(" Record ");
1199 builder.append(":");
1200 builder.append(" [ ClassName: " + record.mClassName);
1201 builder.append("; Text: " + record.mText);
1202 builder.append("; ContentDescription: " + record.mContentDescription);
1203 builder.append("; ItemCount: " + record.mItemCount);
1204 builder.append("; CurrentItemIndex: " + record.mCurrentItemIndex);
1205 builder.append("; IsEnabled: " + record.isEnabled());
1206 builder.append("; IsPassword: " + record.isPassword());
1207 builder.append("; IsChecked: " + record.isChecked());
1208 builder.append("; IsFullScreen: " + record.isFullScreen());
1209 builder.append("; Scrollable: " + record.isScrollable());
1210 builder.append("; BeforeText: " + record.mBeforeText);
1211 builder.append("; FromIndex: " + record.mFromIndex);
1212 builder.append("; ToIndex: " + record.mToIndex);
1213 builder.append("; ScrollX: " + record.mScrollX);
1214 builder.append("; ScrollY: " + record.mScrollY);
1215 builder.append("; AddedCount: " + record.mAddedCount);
1216 builder.append("; RemovedCount: " + record.mRemovedCount);
1217 builder.append("; ParcelableData: " + record.mParcelableData);
1218 builder.append(" ]");
1219 builder.append("\n");
1222 builder.append("; recordCount: ").append(getRecordCount());
1224 return builder.toString();
1228 * Returns the string representation of an event type. For example,
1229 * {@link #TYPE_VIEW_CLICKED} is represented by the string TYPE_VIEW_CLICKED.
1231 * @param eventType The event type
1232 * @return The string representation.
1234 public static String eventTypeToString(int eventType) {
1235 if (eventType == TYPES_ALL_MASK) {
1236 return "TYPES_ALL_MASK";
1238 StringBuilder builder = new StringBuilder();
1239 int eventTypeCount = 0;
1240 while (eventType != 0) {
1241 final int eventTypeFlag = 1 << Integer.numberOfTrailingZeros(eventType);
1242 eventType &= ~eventTypeFlag;
1244 if (eventTypeCount > 0) {
1245 builder.append(", ");
1247 builder.append(singleEventTypeToString(eventTypeFlag));
1251 if (eventTypeCount > 1) {
1252 builder.insert(0, '[');
1253 builder.append(']');
1255 return builder.toString();
1258 private static String singleEventTypeToString(int eventType) {
1259 switch (eventType) {
1260 case TYPE_VIEW_CLICKED: return "TYPE_VIEW_CLICKED";
1261 case TYPE_VIEW_LONG_CLICKED: return "TYPE_VIEW_LONG_CLICKED";
1262 case TYPE_VIEW_SELECTED: return "TYPE_VIEW_SELECTED";
1263 case TYPE_VIEW_FOCUSED: return "TYPE_VIEW_FOCUSED";
1264 case TYPE_VIEW_TEXT_CHANGED: return "TYPE_VIEW_TEXT_CHANGED";
1265 case TYPE_WINDOW_STATE_CHANGED: return "TYPE_WINDOW_STATE_CHANGED";
1266 case TYPE_VIEW_HOVER_ENTER: return "TYPE_VIEW_HOVER_ENTER";
1267 case TYPE_VIEW_HOVER_EXIT: return "TYPE_VIEW_HOVER_EXIT";
1268 case TYPE_NOTIFICATION_STATE_CHANGED: return "TYPE_NOTIFICATION_STATE_CHANGED";
1269 case TYPE_TOUCH_EXPLORATION_GESTURE_START: {
1270 return "TYPE_TOUCH_EXPLORATION_GESTURE_START";
1272 case TYPE_TOUCH_EXPLORATION_GESTURE_END: return "TYPE_TOUCH_EXPLORATION_GESTURE_END";
1273 case TYPE_WINDOW_CONTENT_CHANGED: return "TYPE_WINDOW_CONTENT_CHANGED";
1274 case TYPE_VIEW_TEXT_SELECTION_CHANGED: return "TYPE_VIEW_TEXT_SELECTION_CHANGED";
1275 case TYPE_VIEW_SCROLLED: return "TYPE_VIEW_SCROLLED";
1276 case TYPE_ANNOUNCEMENT: return "TYPE_ANNOUNCEMENT";
1277 case TYPE_VIEW_ACCESSIBILITY_FOCUSED: return "TYPE_VIEW_ACCESSIBILITY_FOCUSED";
1278 case TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: {
1279 return "TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED";
1281 case TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY: {
1282 return "TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY";
1284 case TYPE_GESTURE_DETECTION_START: return "TYPE_GESTURE_DETECTION_START";
1285 case TYPE_GESTURE_DETECTION_END: return "TYPE_GESTURE_DETECTION_END";
1286 case TYPE_TOUCH_INTERACTION_START: return "TYPE_TOUCH_INTERACTION_START";
1287 case TYPE_TOUCH_INTERACTION_END: return "TYPE_TOUCH_INTERACTION_END";
1288 case TYPE_WINDOWS_CHANGED: return "TYPE_WINDOWS_CHANGED";
1289 case TYPE_VIEW_CONTEXT_CLICKED: return "TYPE_VIEW_CONTEXT_CLICKED";
1290 case TYPE_ASSIST_READING_CONTEXT: return "TYPE_ASSIST_READING_CONTEXT";
1291 default: return Integer.toHexString(eventType);
1296 * @see Parcelable.Creator
1298 public static final Parcelable.Creator<AccessibilityEvent> CREATOR =
1299 new Parcelable.Creator<AccessibilityEvent>() {
1300 public AccessibilityEvent createFromParcel(Parcel parcel) {
1301 AccessibilityEvent event = AccessibilityEvent.obtain();
1302 event.initFromParcel(parcel);
1306 public AccessibilityEvent[] newArray(int size) {
1307 return new AccessibilityEvent[size];