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.view.accessibility; 18 19 import android.os.Parcel; 20 import android.os.Parcelable; 21 import android.text.TextUtils; 22 23 import java.util.ArrayList; 24 import java.util.List; 25 26 /** 27 * <p> 28 * This class represents accessibility events that are sent by the system when 29 * something notable happens in the user interface. For example, when a 30 * {@link android.widget.Button} is clicked, a {@link android.view.View} is focused, etc. 31 * </p> 32 * <p> 33 * An accessibility event is fired by an individual view which populates the event with 34 * data for its state and requests from its parent to send the event to interested 35 * parties. The parent can optionally add an {@link AccessibilityRecord} for itself before 36 * dispatching a similar request to its parent. A parent can also choose not to respect the 37 * request for sending an event. The accessibility event is sent by the topmost view in the 38 * view tree. Therefore, an {@link android.accessibilityservice.AccessibilityService} can 39 * explore all records in an accessibility event to obtain more information about the 40 * context in which the event was fired. 41 * </p> 42 * <p> 43 * The main purpose of an accessibility event is to expose enough information for an 44 * {@link android.accessibilityservice.AccessibilityService} to provide meaningful feedback 45 * to the user. Sometimes however, an accessibility service may need more contextual 46 * information then the one in the event pay-load. In such cases the service can obtain 47 * the event source which is an {@link AccessibilityNodeInfo} (snapshot of a View state) 48 * which can be used for exploring the window content. Note that the privilege for accessing 49 * an event's source, thus the window content, has to be explicitly requested. For more 50 * details refer to {@link android.accessibilityservice.AccessibilityService}. If an 51 * accessibility service has not requested to retrieve the window content the event will 52 * not contain reference to its source. Also for events of type 53 * {@link #TYPE_NOTIFICATION_STATE_CHANGED} the source is never available. 54 * </p> 55 * <p> 56 * This class represents various semantically different accessibility event 57 * types. Each event type has an associated set of related properties. In other 58 * words, each event type is characterized via a subset of the properties exposed 59 * by this class. For each event type there is a corresponding constant defined 60 * in this class. Follows a specification of the event types and their associated properties: 61 * </p> 62 * <div class="special reference"> 63 * <h3>Developer Guides</h3> 64 * <p>For more information about creating and processing AccessibilityEvents, read the 65 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 66 * developer guide.</p> 67 * </div> 68 * <p> 69 * <b>VIEW TYPES</b></br> 70 * </p> 71 * <p> 72 * <b>View clicked</b> - represents the event of clicking on a {@link android.view.View} 73 * like {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc.</br> 74 * <em>Type:</em>{@link #TYPE_VIEW_CLICKED}</br> 75 * <em>Properties:</em></br> 76 * <ul> 77 * <li>{@link #getEventType()} - The type of the event.</li> 78 * <li>{@link #getSource()} - The source info (for registered clients).</li> 79 * <li>{@link #getClassName()} - The class name of the source.</li> 80 * <li>{@link #getPackageName()} - The package name of the source.</li> 81 * <li>{@link #getEventTime()} - The event time.</li> 82 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 83 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 84 * <li>{@link #isPassword()} - Whether the source is password.</li> 85 * <li>{@link #isChecked()} - Whether the source is checked.</li> 86 * <li>{@link #getContentDescription()} - The content description of the source.</li> 87 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels 88 * (without descendants of AdapterView).</li> 89 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels 90 * (without descendants of AdapterView).</li> 91 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source, 92 * inclusive (for descendants of AdapterView).</li> 93 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source, 94 * inclusive (for descendants of AdapterView).</li> 95 * <li>{@link #getItemCount()} - The total items of the source 96 * (for descendants of AdapterView).</li> 97 * </ul> 98 * </p> 99 * <p> 100 * <b>View long clicked</b> - represents the event of long clicking on a {@link android.view.View} 101 * like {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc </br> 102 * <em>Type:</em>{@link #TYPE_VIEW_LONG_CLICKED}</br> 103 * <em>Properties:</em></br> 104 * <ul> 105 * <li>{@link #getEventType()} - The type of the event.</li> 106 * <li>{@link #getSource()} - The source info (for registered clients).</li> 107 * <li>{@link #getClassName()} - The class name of the source.</li> 108 * <li>{@link #getPackageName()} - The package name of the source.</li> 109 * <li>{@link #getEventTime()} - The event time.</li> 110 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 111 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 112 * <li>{@link #isPassword()} - Whether the source is password.</li> 113 * <li>{@link #isChecked()} - Whether the source is checked.</li> 114 * <li>{@link #getContentDescription()} - The content description of the source.</li> 115 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels 116 * (without descendants of AdapterView).</li> 117 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels 118 * (without descendants of AdapterView).</li> 119 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source, 120 * inclusive (for descendants of AdapterView).</li> 121 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source, 122 * inclusive (for descendants of AdapterView).</li> 123 * <li>{@link #getItemCount()} - The total items of the source 124 * (for descendants of AdapterView).</li> 125 * </ul> 126 * </p> 127 * <p> 128 * <b>View selected</b> - represents the event of selecting an item usually in 129 * the context of an {@link android.widget.AdapterView}.</br> 130 * <em>Type:</em> {@link #TYPE_VIEW_SELECTED}</br> 131 * <em>Properties:</em></br> 132 * <ul> 133 * <li>{@link #getEventType()} - The type of the event.</li> 134 * <li>{@link #getSource()} - The source info (for registered clients).</li> 135 * <li>{@link #getClassName()} - The class name of the source.</li> 136 * <li>{@link #getPackageName()} - The package name of the source.</li> 137 * <li>{@link #getEventTime()} - The event time.</li> 138 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 139 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 140 * <li>{@link #isPassword()} - Whether the source is password.</li> 141 * <li>{@link #isChecked()} - Whether the source is checked.</li> 142 * <li>{@link #getItemCount()} - The number of selectable items of the source.</li> 143 * <li>{@link #getCurrentItemIndex()} - The currently selected item index.</li> 144 * <li>{@link #getContentDescription()} - The content description of the source.</li> 145 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels 146 * (without descendants of AdapterView).</li> 147 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels 148 * (without descendants of AdapterView).</li> 149 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source, 150 * inclusive (for descendants of AdapterView).</li> 151 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source, 152 * inclusive (for descendants of AdapterView).</li> 153 * <li>{@link #getItemCount()} - The total items of the source 154 * (for descendants of AdapterView).</li> 155 * </ul> 156 * </p> 157 * <p> 158 * <b>View focused</b> - represents the event of focusing a 159 * {@link android.view.View}.</br> 160 * <em>Type:</em> {@link #TYPE_VIEW_FOCUSED}</br> 161 * <em>Properties:</em></br> 162 * <ul> 163 * <li>{@link #getEventType()} - The type of the event.</li> 164 * <li>{@link #getSource()} - The source info (for registered clients).</li> 165 * <li>{@link #getClassName()} - The class name of the source.</li> 166 * <li>{@link #getPackageName()} - The package name of the source.</li> 167 * <li>{@link #getEventTime()} - The event time.</li> 168 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 169 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 170 * <li>{@link #isPassword()} - Whether the source is password.</li> 171 * <li>{@link #isChecked()} - Whether the source is checked.</li> 172 * <li>{@link #getItemCount()} - The number of focusable items on the screen.</li> 173 * <li>{@link #getCurrentItemIndex()} - The currently focused item index.</li> 174 * <li>{@link #getContentDescription()} - The content description of the source.</li> 175 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels 176 * (without descendants of AdapterView).</li> 177 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels 178 * (without descendants of AdapterView).</li> 179 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source, 180 * inclusive (for descendants of AdapterView).</li> 181 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source, 182 * inclusive (for descendants of AdapterView).</li> 183 * <li>{@link #getItemCount()} - The total items of the source 184 * (for descendants of AdapterView).</li> 185 * </ul> 186 * </p> 187 * <p> 188 * <b>View text changed</b> - represents the event of changing the text of an 189 * {@link android.widget.EditText}.</br> 190 * <em>Type:</em> {@link #TYPE_VIEW_TEXT_CHANGED}</br> 191 * <em>Properties:</em></br> 192 * <ul> 193 * <li>{@link #getEventType()} - The type of the event.</li> 194 * <li>{@link #getSource()} - The source info (for registered clients).</li> 195 * <li>{@link #getClassName()} - The class name of the source.</li> 196 * <li>{@link #getPackageName()} - The package name of the source.</li> 197 * <li>{@link #getEventTime()} - The event time.</li> 198 * <li>{@link #getText()} - The text of the source.</li> 199 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 200 * <li>{@link #isPassword()} - Whether the source is password.</li> 201 * <li>{@link #isChecked()} - Whether the source is checked.</li> 202 * <li>{@link #getFromIndex()} - The text change start index.</li> 203 * <li>{@link #getAddedCount()} - The number of added characters.</li> 204 * <li>{@link #getRemovedCount()} - The number of removed characters.</li> 205 * <li>{@link #getBeforeText()} - The text of the source before the change.</li> 206 * <li>{@link #getContentDescription()} - The content description of the source.</li> 207 * </ul> 208 * </p> 209 * <p> 210 * <b>View text selection changed</b> - represents the event of changing the text 211 * selection of an {@link android.widget.EditText}.</br> 212 * <em>Type:</em> {@link #TYPE_VIEW_TEXT_SELECTION_CHANGED} </br> 213 * <em>Properties:</em></br> 214 * <ul> 215 * <li>{@link #getEventType()} - The type of the event.</li> 216 * <li>{@link #getSource()} - The source info (for registered clients).</li> 217 * <li>{@link #getClassName()} - The class name of the source.</li> 218 * <li>{@link #getPackageName()} - The package name of the source.</li> 219 * <li>{@link #getEventTime()} - The event time.</li> 220 * <li>{@link #getText()} - The text of the source.</li> 221 * <li>{@link #isPassword()} - Whether the source is password.</li> 222 * <li>{@link #getFromIndex()} - The selection start index.</li> 223 * <li>{@link #getToIndex()} - The selection end index.</li> 224 * <li>{@link #getItemCount()} - The length of the source text.</li> 225 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 226 * <li>{@link #getContentDescription()} - The content description of the source.</li> 227 * </ul> 228 * </p> 229 * <b>View text traversed at movement granularity</b> - represents the event of traversing the 230 * text of a view at a given granularity. For example, moving to the next word.</br> 231 * <em>Type:</em> {@link #TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY} </br> 232 * <em>Properties:</em></br> 233 * <ul> 234 * <li>{@link #getEventType()} - The type of the event.</li> 235 * <li>{@link #getSource()} - The source info (for registered clients).</li> 236 * <li>{@link #getClassName()} - The class name of the source.</li> 237 * <li>{@link #getPackageName()} - The package name of the source.</li> 238 * <li>{@link #getEventTime()} - The event time.</li> 239 * <li>{@link #getMovementGranularity()} - Sets the granularity at which a view's text 240 * was traversed.</li> 241 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 242 * <li>{@link #getFromIndex()} - The start of the next/previous text at the specified granularity 243 * - inclusive.</li> 244 * <li>{@link #getToIndex()} - The end of the next/previous text at the specified granularity 245 * - exclusive.</li> 246 * <li>{@link #isPassword()} - Whether the source is password.</li> 247 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 248 * <li>{@link #getContentDescription()} - The content description of the source.</li> 249 * <li>{@link #getMovementGranularity()} - Sets the granularity at which a view's text 250 * was traversed.</li> 251 * <li>{@link #getAction()} - Gets traversal action which specifies the direction.</li> 252 * </ul> 253 * </p> 254 * <p> 255 * <b>View scrolled</b> - represents the event of scrolling a view. If 256 * the source is a descendant of {@link android.widget.AdapterView} the 257 * scroll is reported in terms of visible items - the first visible item, 258 * the last visible item, and the total items - because the the source 259 * is unaware of its pixel size since its adapter is responsible for 260 * creating views. In all other cases the scroll is reported as the current 261 * scroll on the X and Y axis respectively plus the height of the source in 262 * pixels.</br> 263 * <em>Type:</em> {@link #TYPE_VIEW_SCROLLED}</br> 264 * <em>Properties:</em></br> 265 * <ul> 266 * <li>{@link #getEventType()} - The type of the event.</li> 267 * <li>{@link #getSource()} - The source info (for registered clients).</li> 268 * <li>{@link #getClassName()} - The class name of the source.</li> 269 * <li>{@link #getPackageName()} - The package name of the source.</li> 270 * <li>{@link #getEventTime()} - The event time.</li> 271 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 272 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 273 * <li>{@link #getContentDescription()} - The content description of the source.</li> 274 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels 275 * (without descendants of AdapterView).</li> 276 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels 277 * (without descendants of AdapterView).</li> 278 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source, 279 * inclusive (for descendants of AdapterView).</li> 280 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source, 281 * inclusive (for descendants of AdapterView).</li> 282 * <li>{@link #getItemCount()} - The total items of the source 283 * (for descendants of AdapterView).</li> 284 * </ul> 285 * <em>Note:</em> This event type is not dispatched to descendants though 286 * {@link android.view.View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 287 * View.dispatchPopulateAccessibilityEvent(AccessibilityEvent)}, hence the event 288 * source {@link android.view.View} and the sub-tree rooted at it will not receive 289 * calls to {@link android.view.View#onPopulateAccessibilityEvent(AccessibilityEvent) 290 * View.onPopulateAccessibilityEvent(AccessibilityEvent)}. The preferred way to add 291 * text content to such events is by setting the 292 * {@link android.R.styleable#View_contentDescription contentDescription} of the source 293 * view.</br> 294 * </p> 295 * <p> 296 * <b>TRANSITION TYPES</b></br> 297 * </p> 298 * <p> 299 * <b>Window state changed</b> - represents the event of opening a 300 * {@link android.widget.PopupWindow}, {@link android.view.Menu}, 301 * {@link android.app.Dialog}, etc.</br> 302 * <em>Type:</em> {@link #TYPE_WINDOW_STATE_CHANGED}</br> 303 * <em>Properties:</em></br> 304 * <ul> 305 * <li>{@link #getEventType()} - The type of the event.</li> 306 * <li>{@link #getSource()} - The source info (for registered clients).</li> 307 * <li>{@link #getClassName()} - The class name of the source.</li> 308 * <li>{@link #getPackageName()} - The package name of the source.</li> 309 * <li>{@link #getEventTime()} - The event time.</li> 310 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 311 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 312 * </ul> 313 * </p> 314 * <p> 315 * <b>Window content changed</b> - represents the event of change in the 316 * content of a window. This change can be adding/removing view, changing 317 * a view size, etc.</br> 318 * </p> 319 * <p> 320 * <strong>Note:</strong> This event is fired only for the window source of the 321 * last accessibility event different from {@link #TYPE_NOTIFICATION_STATE_CHANGED} 322 * and its purpose is to notify clients that the content of the user interaction 323 * window has changed.</br> 324 * <em>Type:</em> {@link #TYPE_WINDOW_CONTENT_CHANGED}</br> 325 * <em>Properties:</em></br> 326 * <ul> 327 * <li>{@link #getEventType()} - The type of the event.</li> 328 * <li>{@link #getSource()} - The source info (for registered clients).</li> 329 * <li>{@link #getClassName()} - The class name of the source.</li> 330 * <li>{@link #getPackageName()} - The package name of the source.</li> 331 * <li>{@link #getEventTime()} - The event time.</li> 332 * </ul> 333 * <em>Note:</em> This event type is not dispatched to descendants though 334 * {@link android.view.View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 335 * View.dispatchPopulateAccessibilityEvent(AccessibilityEvent)}, hence the event 336 * source {@link android.view.View} and the sub-tree rooted at it will not receive 337 * calls to {@link android.view.View#onPopulateAccessibilityEvent(AccessibilityEvent) 338 * View.onPopulateAccessibilityEvent(AccessibilityEvent)}. The preferred way to add 339 * text content to such events is by setting the 340 * {@link android.R.styleable#View_contentDescription contentDescription} of the source 341 * view.</br> 342 * </p> 343 * <p> 344 * <b>NOTIFICATION TYPES</b></br> 345 * </p> 346 * <p> 347 * <b>Notification state changed</b> - represents the event showing 348 * {@link android.app.Notification}.</br> 349 * <em>Type:</em> {@link #TYPE_NOTIFICATION_STATE_CHANGED}</br> 350 * <em>Properties:</em></br> 351 * <ul> 352 * <li>{@link #getEventType()} - The type of the event.</li> 353 * <li>{@link #getClassName()} - The class name of the source.</li> 354 * <li>{@link #getPackageName()} - The package name of the source.</li> 355 * <li>{@link #getEventTime()} - The event time.</li> 356 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 357 * <li>{@link #getParcelableData()} - The posted {@link android.app.Notification}.</li> 358 * <li>{@link #getText()} - Text for providing more context.</li> 359 * </ul> 360 * <em>Note:</em> This event type is not dispatched to descendants though 361 * {@link android.view.View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 362 * View.dispatchPopulateAccessibilityEvent(AccessibilityEvent)}, hence the event 363 * source {@link android.view.View} and the sub-tree rooted at it will not receive 364 * calls to {@link android.view.View#onPopulateAccessibilityEvent(AccessibilityEvent) 365 * View.onPopulateAccessibilityEvent(AccessibilityEvent)}. The preferred way to add 366 * text content to such events is by setting the 367 * {@link android.R.styleable#View_contentDescription contentDescription} of the source 368 * view.</br> 369 * </p> 370 * <p> 371 * <b>EXPLORATION TYPES</b></br> 372 * </p> 373 * <p> 374 * <b>View hover enter</b> - represents the event of beginning to hover 375 * over a {@link android.view.View}. The hover may be generated via 376 * exploring the screen by touch or via a pointing device.</br> 377 * <em>Type:</em> {@link #TYPE_VIEW_HOVER_ENTER}</br> 378 * <em>Properties:</em></br> 379 * <ul> 380 * <li>{@link #getEventType()} - The type of the event.</li> 381 * <li>{@link #getSource()} - The source info (for registered clients).</li> 382 * <li>{@link #getClassName()} - The class name of the source.</li> 383 * <li>{@link #getPackageName()} - The package name of the source.</li> 384 * <li>{@link #getEventTime()} - The event time.</li> 385 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 386 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 387 * <li>{@link #getContentDescription()} - The content description of the source.</li> 388 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels 389 * (without descendants of AdapterView).</li> 390 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels 391 * (without descendants of AdapterView).</li> 392 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source, 393 * inclusive (for descendants of AdapterView).</li> 394 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source, 395 * inclusive (for descendants of AdapterView).</li> 396 * <li>{@link #getItemCount()} - The total items of the source 397 * (for descendants of AdapterView).</li> 398 * </ul> 399 * </p> 400 * <b>View hover exit</b> - represents the event of stopping to hover 401 * over a {@link android.view.View}. The hover may be generated via 402 * exploring the screen by touch or via a pointing device.</br> 403 * <em>Type:</em> {@link #TYPE_VIEW_HOVER_EXIT}</br> 404 * <em>Properties:</em></br> 405 * <ul> 406 * <li>{@link #getEventType()} - The type of the event.</li> 407 * <li>{@link #getSource()} - The source info (for registered clients).</li> 408 * <li>{@link #getClassName()} - The class name of the source.</li> 409 * <li>{@link #getPackageName()} - The package name of the source.</li> 410 * <li>{@link #getEventTime()} - The event time.</li> 411 * <li>{@link #getText()} - The text of the source's sub-tree.</li> 412 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 413 * <li>{@link #getContentDescription()} - The content description of the source.</li> 414 * <li>{@link #getScrollX()} - The offset of the source left edge in pixels 415 * (without descendants of AdapterView).</li> 416 * <li>{@link #getScrollY()} - The offset of the source top edge in pixels 417 * (without descendants of AdapterView).</li> 418 * <li>{@link #getFromIndex()} - The zero based index of the first visible item of the source, 419 * inclusive (for descendants of AdapterView).</li> 420 * <li>{@link #getToIndex()} - The zero based index of the last visible item of the source, 421 * inclusive (for descendants of AdapterView).</li> 422 * <li>{@link #getItemCount()} - The total items of the source 423 * (for descendants of AdapterView).</li> 424 * </ul> 425 * </p> 426 * <p> 427 * <b>Touch exploration gesture start</b> - represents the event of starting a touch 428 * exploring gesture.</br> 429 * <em>Type:</em> {@link #TYPE_TOUCH_EXPLORATION_GESTURE_START}</br> 430 * <em>Properties:</em></br> 431 * <ul> 432 * <li>{@link #getEventType()} - The type of the event.</li> 433 * </ul> 434 * <em>Note:</em> This event type is not dispatched to descendants though 435 * {@link android.view.View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 436 * View.dispatchPopulateAccessibilityEvent(AccessibilityEvent)}, hence the event 437 * source {@link android.view.View} and the sub-tree rooted at it will not receive 438 * calls to {@link android.view.View#onPopulateAccessibilityEvent(AccessibilityEvent) 439 * View.onPopulateAccessibilityEvent(AccessibilityEvent)}. The preferred way to add 440 * text content to such events is by setting the 441 * {@link android.R.styleable#View_contentDescription contentDescription} of the source 442 * view.</br> 443 * </p> 444 * <p> 445 * <b>Touch exploration gesture end</b> - represents the event of ending a touch 446 * exploring gesture.</br> 447 * <em>Type:</em> {@link #TYPE_TOUCH_EXPLORATION_GESTURE_END}</br> 448 * <em>Properties:</em></br> 449 * <ul> 450 * <li>{@link #getEventType()} - The type of the event.</li> 451 * </ul> 452 * <em>Note:</em> This event type is not dispatched to descendants though 453 * {@link android.view.View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 454 * View.dispatchPopulateAccessibilityEvent(AccessibilityEvent)}, hence the event 455 * source {@link android.view.View} and the sub-tree rooted at it will not receive 456 * calls to {@link android.view.View#onPopulateAccessibilityEvent(AccessibilityEvent) 457 * View.onPopulateAccessibilityEvent(AccessibilityEvent)}. The preferred way to add 458 * text content to such events is by setting the 459 * {@link android.R.styleable#View_contentDescription contentDescription} of the source 460 * view.</br> 461 * </p> 462 * <p> 463 * <b>MISCELLANEOUS TYPES</b></br> 464 * </p> 465 * <p> 466 * <b>Announcement</b> - represents the event of an application making an 467 * announcement. Usually this announcement is related to some sort of a context 468 * change for which none of the events representing UI transitions is a good fit. 469 * For example, announcing a new page in a book.</br> 470 * <em>Type:</em> {@link #TYPE_ANNOUNCEMENT}</br> 471 * <em>Properties:</em></br> 472 * <ul> 473 * <li>{@link #getEventType()} - The type of the event.</li> 474 * <li>{@link #getSource()} - The source info (for registered clients).</li> 475 * <li>{@link #getClassName()} - The class name of the source.</li> 476 * <li>{@link #getPackageName()} - The package name of the source.</li> 477 * <li>{@link #getEventTime()} - The event time.</li> 478 * <li>{@link #getText()} - The text of the announcement.</li> 479 * <li>{@link #isEnabled()} - Whether the source is enabled.</li> 480 * </ul> 481 * </p> 482 * <p> 483 * <b>Security note</b> 484 * <p> 485 * Since an event contains the text of its source privacy can be compromised by leaking 486 * sensitive information such as passwords. To address this issue any event fired in response 487 * to manipulation of a PASSWORD field does NOT CONTAIN the text of the password. 488 * </p> 489 * 490 * @see android.view.accessibility.AccessibilityManager 491 * @see android.accessibilityservice.AccessibilityService 492 * @see AccessibilityNodeInfo 493 */ 494 public final class AccessibilityEvent extends AccessibilityRecord implements Parcelable { 495 private static final boolean DEBUG = false; 496 497 /** 498 * Invalid selection/focus position. 499 * 500 * @see #getCurrentItemIndex() 501 */ 502 public static final int INVALID_POSITION = -1; 503 504 /** 505 * Maximum length of the text fields. 506 * 507 * @see #getBeforeText() 508 * @see #getText() 509 * </br> 510 * Note: This constant is no longer needed since there 511 * is no limit on the length of text that is contained 512 * in an accessibility event anymore. 513 */ 514 @Deprecated 515 public static final int MAX_TEXT_LENGTH = 500; 516 517 /** 518 * Represents the event of clicking on a {@link android.view.View} like 519 * {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc. 520 */ 521 public static final int TYPE_VIEW_CLICKED = 0x00000001; 522 523 /** 524 * Represents the event of long clicking on a {@link android.view.View} like 525 * {@link android.widget.Button}, {@link android.widget.CompoundButton}, etc. 526 */ 527 public static final int TYPE_VIEW_LONG_CLICKED = 0x00000002; 528 529 /** 530 * Represents the event of selecting an item usually in the context of an 531 * {@link android.widget.AdapterView}. 532 */ 533 public static final int TYPE_VIEW_SELECTED = 0x00000004; 534 535 /** 536 * Represents the event of setting input focus of a {@link android.view.View}. 537 */ 538 public static final int TYPE_VIEW_FOCUSED = 0x00000008; 539 540 /** 541 * Represents the event of changing the text of an {@link android.widget.EditText}. 542 */ 543 public static final int TYPE_VIEW_TEXT_CHANGED = 0x00000010; 544 545 /** 546 * Represents the event of opening a {@link android.widget.PopupWindow}, 547 * {@link android.view.Menu}, {@link android.app.Dialog}, etc. 548 */ 549 public static final int TYPE_WINDOW_STATE_CHANGED = 0x00000020; 550 551 /** 552 * Represents the event showing a {@link android.app.Notification}. 553 */ 554 public static final int TYPE_NOTIFICATION_STATE_CHANGED = 0x00000040; 555 556 /** 557 * Represents the event of a hover enter over a {@link android.view.View}. 558 */ 559 public static final int TYPE_VIEW_HOVER_ENTER = 0x00000080; 560 561 /** 562 * Represents the event of a hover exit over a {@link android.view.View}. 563 */ 564 public static final int TYPE_VIEW_HOVER_EXIT = 0x00000100; 565 566 /** 567 * Represents the event of starting a touch exploration gesture. 568 */ 569 public static final int TYPE_TOUCH_EXPLORATION_GESTURE_START = 0x00000200; 570 571 /** 572 * Represents the event of ending a touch exploration gesture. 573 */ 574 public static final int TYPE_TOUCH_EXPLORATION_GESTURE_END = 0x00000400; 575 576 /** 577 * Represents the event of changing the content of a window and more 578 * specifically the sub-tree rooted at the event's source. 579 */ 580 public static final int TYPE_WINDOW_CONTENT_CHANGED = 0x00000800; 581 582 /** 583 * Represents the event of scrolling a view. 584 */ 585 public static final int TYPE_VIEW_SCROLLED = 0x00001000; 586 587 /** 588 * Represents the event of changing the selection in an {@link android.widget.EditText}. 589 */ 590 public static final int TYPE_VIEW_TEXT_SELECTION_CHANGED = 0x00002000; 591 592 /** 593 * Represents the event of an application making an announcement. 594 */ 595 public static final int TYPE_ANNOUNCEMENT = 0x00004000; 596 597 /** 598 * Represents the event of gaining accessibility focus. 599 */ 600 public static final int TYPE_VIEW_ACCESSIBILITY_FOCUSED = 0x00008000; 601 602 /** 603 * Represents the event of clearing accessibility focus. 604 */ 605 public static final int TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED = 0x00010000; 606 607 /** 608 * Represents the event of traversing the text of a view at a given movement granularity. 609 */ 610 public static final int TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY = 0x00020000; 611 612 /** 613 * Mask for {@link AccessibilityEvent} all types. 614 * 615 * @see #TYPE_VIEW_CLICKED 616 * @see #TYPE_VIEW_LONG_CLICKED 617 * @see #TYPE_VIEW_SELECTED 618 * @see #TYPE_VIEW_FOCUSED 619 * @see #TYPE_VIEW_TEXT_CHANGED 620 * @see #TYPE_WINDOW_STATE_CHANGED 621 * @see #TYPE_NOTIFICATION_STATE_CHANGED 622 * @see #TYPE_VIEW_HOVER_ENTER 623 * @see #TYPE_VIEW_HOVER_EXIT 624 * @see #TYPE_TOUCH_EXPLORATION_GESTURE_START 625 * @see #TYPE_TOUCH_EXPLORATION_GESTURE_END 626 * @see #TYPE_WINDOW_CONTENT_CHANGED 627 * @see #TYPE_VIEW_SCROLLED 628 * @see #TYPE_VIEW_TEXT_SELECTION_CHANGED 629 * @see #TYPE_ANNOUNCEMENT 630 * @see #TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY 631 */ 632 public static final int TYPES_ALL_MASK = 0xFFFFFFFF; 633 634 private static final int MAX_POOL_SIZE = 10; 635 private static final Object sPoolLock = new Object(); 636 private static AccessibilityEvent sPool; 637 private static int sPoolSize; 638 private AccessibilityEvent mNext; 639 private boolean mIsInPool; 640 641 private int mEventType; 642 private CharSequence mPackageName; 643 private long mEventTime; 644 int mMovementGranularity; 645 int mAction; 646 647 private final ArrayList<AccessibilityRecord> mRecords = new ArrayList<AccessibilityRecord>(); 648 649 /* 650 * Hide constructor from clients. 651 */ AccessibilityEvent()652 private AccessibilityEvent() { 653 } 654 655 /** 656 * Initialize an event from another one. 657 * 658 * @param event The event to initialize from. 659 */ init(AccessibilityEvent event)660 void init(AccessibilityEvent event) { 661 super.init(event); 662 mEventType = event.mEventType; 663 mMovementGranularity = event.mMovementGranularity; 664 mAction = event.mAction; 665 mEventTime = event.mEventTime; 666 mPackageName = event.mPackageName; 667 } 668 669 /** 670 * Sets if this instance is sealed. 671 * 672 * @param sealed Whether is sealed. 673 * 674 * @hide 675 */ 676 @Override setSealed(boolean sealed)677 public void setSealed(boolean sealed) { 678 super.setSealed(sealed); 679 List<AccessibilityRecord> records = mRecords; 680 final int recordCount = records.size(); 681 for (int i = 0; i < recordCount; i++) { 682 AccessibilityRecord record = records.get(i); 683 record.setSealed(sealed); 684 } 685 } 686 687 /** 688 * Gets the number of records contained in the event. 689 * 690 * @return The number of records. 691 */ getRecordCount()692 public int getRecordCount() { 693 return mRecords.size(); 694 } 695 696 /** 697 * Appends an {@link AccessibilityRecord} to the end of event records. 698 * 699 * @param record The record to append. 700 * 701 * @throws IllegalStateException If called from an AccessibilityService. 702 */ appendRecord(AccessibilityRecord record)703 public void appendRecord(AccessibilityRecord record) { 704 enforceNotSealed(); 705 mRecords.add(record); 706 } 707 708 /** 709 * Gets the record at a given index. 710 * 711 * @param index The index. 712 * @return The record at the specified index. 713 */ getRecord(int index)714 public AccessibilityRecord getRecord(int index) { 715 return mRecords.get(index); 716 } 717 718 /** 719 * Gets the event type. 720 * 721 * @return The event type. 722 */ getEventType()723 public int getEventType() { 724 return mEventType; 725 } 726 727 /** 728 * Sets the event type. 729 * 730 * @param eventType The event type. 731 * 732 * @throws IllegalStateException If called from an AccessibilityService. 733 */ setEventType(int eventType)734 public void setEventType(int eventType) { 735 enforceNotSealed(); 736 mEventType = eventType; 737 } 738 739 /** 740 * Gets the time in which this event was sent. 741 * 742 * @return The event time. 743 */ getEventTime()744 public long getEventTime() { 745 return mEventTime; 746 } 747 748 /** 749 * Sets the time in which this event was sent. 750 * 751 * @param eventTime The event time. 752 * 753 * @throws IllegalStateException If called from an AccessibilityService. 754 */ setEventTime(long eventTime)755 public void setEventTime(long eventTime) { 756 enforceNotSealed(); 757 mEventTime = eventTime; 758 } 759 760 /** 761 * Gets the package name of the source. 762 * 763 * @return The package name. 764 */ getPackageName()765 public CharSequence getPackageName() { 766 return mPackageName; 767 } 768 769 /** 770 * Sets the package name of the source. 771 * 772 * @param packageName The package name. 773 * 774 * @throws IllegalStateException If called from an AccessibilityService. 775 */ setPackageName(CharSequence packageName)776 public void setPackageName(CharSequence packageName) { 777 enforceNotSealed(); 778 mPackageName = packageName; 779 } 780 781 /** 782 * Sets the movement granularity that was traversed. 783 * 784 * @param granularity The granularity. 785 * 786 * @throws IllegalStateException If called from an AccessibilityService. 787 */ setMovementGranularity(int granularity)788 public void setMovementGranularity(int granularity) { 789 enforceNotSealed(); 790 mMovementGranularity = granularity; 791 } 792 793 /** 794 * Gets the movement granularity that was traversed. 795 * 796 * @return The granularity. 797 */ getMovementGranularity()798 public int getMovementGranularity() { 799 return mMovementGranularity; 800 } 801 802 /** 803 * Sets the performed action that triggered this event. 804 * 805 * @param action The action. 806 * 807 * @throws IllegalStateException If called from an AccessibilityService. 808 */ setAction(int action)809 public void setAction(int action) { 810 enforceNotSealed(); 811 mAction = action; 812 } 813 814 /** 815 * Gets the performed action that triggered this event. 816 * 817 * @return The action. 818 */ getAction()819 public int getAction() { 820 return mAction; 821 } 822 823 /** 824 * Returns a cached instance if such is available or a new one is 825 * instantiated with its type property set. 826 * 827 * @param eventType The event type. 828 * @return An instance. 829 */ obtain(int eventType)830 public static AccessibilityEvent obtain(int eventType) { 831 AccessibilityEvent event = AccessibilityEvent.obtain(); 832 event.setEventType(eventType); 833 return event; 834 } 835 836 /** 837 * Returns a cached instance if such is available or a new one is 838 * created. The returned instance is initialized from the given 839 * <code>event</code>. 840 * 841 * @param event The other event. 842 * @return An instance. 843 */ obtain(AccessibilityEvent event)844 public static AccessibilityEvent obtain(AccessibilityEvent event) { 845 AccessibilityEvent eventClone = AccessibilityEvent.obtain(); 846 eventClone.init(event); 847 848 final int recordCount = event.mRecords.size(); 849 for (int i = 0; i < recordCount; i++) { 850 AccessibilityRecord record = event.mRecords.get(i); 851 AccessibilityRecord recordClone = AccessibilityRecord.obtain(record); 852 eventClone.mRecords.add(recordClone); 853 } 854 855 return eventClone; 856 } 857 858 /** 859 * Returns a cached instance if such is available or a new one is 860 * instantiated. 861 * 862 * @return An instance. 863 */ obtain()864 public static AccessibilityEvent obtain() { 865 synchronized (sPoolLock) { 866 if (sPool != null) { 867 AccessibilityEvent event = sPool; 868 sPool = sPool.mNext; 869 sPoolSize--; 870 event.mNext = null; 871 event.mIsInPool = false; 872 return event; 873 } 874 return new AccessibilityEvent(); 875 } 876 } 877 878 /** 879 * Recycles an instance back to be reused. 880 * <p> 881 * <b>Note: You must not touch the object after calling this function.</b> 882 * </p> 883 * 884 * @throws IllegalStateException If the event is already recycled. 885 */ 886 @Override recycle()887 public void recycle() { 888 if (mIsInPool) { 889 throw new IllegalStateException("Event already recycled!"); 890 } 891 clear(); 892 synchronized (sPoolLock) { 893 if (sPoolSize <= MAX_POOL_SIZE) { 894 mNext = sPool; 895 sPool = this; 896 mIsInPool = true; 897 sPoolSize++; 898 } 899 } 900 } 901 902 /** 903 * Clears the state of this instance. 904 * 905 * @hide 906 */ 907 @Override clear()908 protected void clear() { 909 super.clear(); 910 mEventType = 0; 911 mMovementGranularity = 0; 912 mAction = 0; 913 mPackageName = null; 914 mEventTime = 0; 915 while (!mRecords.isEmpty()) { 916 AccessibilityRecord record = mRecords.remove(0); 917 record.recycle(); 918 } 919 } 920 921 /** 922 * Creates a new instance from a {@link Parcel}. 923 * 924 * @param parcel A parcel containing the state of a {@link AccessibilityEvent}. 925 */ initFromParcel(Parcel parcel)926 public void initFromParcel(Parcel parcel) { 927 mSealed = (parcel.readInt() == 1); 928 mEventType = parcel.readInt(); 929 mMovementGranularity = parcel.readInt(); 930 mAction = parcel.readInt(); 931 mPackageName = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel); 932 mEventTime = parcel.readLong(); 933 mConnectionId = parcel.readInt(); 934 readAccessibilityRecordFromParcel(this, parcel); 935 936 // Read the records. 937 final int recordCount = parcel.readInt(); 938 for (int i = 0; i < recordCount; i++) { 939 AccessibilityRecord record = AccessibilityRecord.obtain(); 940 readAccessibilityRecordFromParcel(record, parcel); 941 record.mConnectionId = mConnectionId; 942 mRecords.add(record); 943 } 944 } 945 946 /** 947 * Reads an {@link AccessibilityRecord} from a parcel. 948 * 949 * @param record The record to initialize. 950 * @param parcel The parcel to read from. 951 */ readAccessibilityRecordFromParcel(AccessibilityRecord record, Parcel parcel)952 private void readAccessibilityRecordFromParcel(AccessibilityRecord record, 953 Parcel parcel) { 954 record.mBooleanProperties = parcel.readInt(); 955 record.mCurrentItemIndex = parcel.readInt(); 956 record.mItemCount = parcel.readInt(); 957 record.mFromIndex = parcel.readInt(); 958 record.mToIndex = parcel.readInt(); 959 record.mScrollX = parcel.readInt(); 960 record.mScrollY = parcel.readInt(); 961 record.mMaxScrollX = parcel.readInt(); 962 record.mMaxScrollY = parcel.readInt(); 963 record.mAddedCount = parcel.readInt(); 964 record.mRemovedCount = parcel.readInt(); 965 record.mClassName = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel); 966 record.mContentDescription = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel); 967 record.mBeforeText = TextUtils.CHAR_SEQUENCE_CREATOR.createFromParcel(parcel); 968 record.mParcelableData = parcel.readParcelable(null); 969 parcel.readList(record.mText, null); 970 record.mSourceWindowId = parcel.readInt(); 971 record.mSourceNodeId = parcel.readLong(); 972 record.mSealed = (parcel.readInt() == 1); 973 } 974 975 /** 976 * {@inheritDoc} 977 */ writeToParcel(Parcel parcel, int flags)978 public void writeToParcel(Parcel parcel, int flags) { 979 parcel.writeInt(isSealed() ? 1 : 0); 980 parcel.writeInt(mEventType); 981 parcel.writeInt(mMovementGranularity); 982 parcel.writeInt(mAction); 983 TextUtils.writeToParcel(mPackageName, parcel, 0); 984 parcel.writeLong(mEventTime); 985 parcel.writeInt(mConnectionId); 986 writeAccessibilityRecordToParcel(this, parcel, flags); 987 988 // Write the records. 989 final int recordCount = getRecordCount(); 990 parcel.writeInt(recordCount); 991 for (int i = 0; i < recordCount; i++) { 992 AccessibilityRecord record = mRecords.get(i); 993 writeAccessibilityRecordToParcel(record, parcel, flags); 994 } 995 } 996 997 /** 998 * Writes an {@link AccessibilityRecord} to a parcel. 999 * 1000 * @param record The record to write. 1001 * @param parcel The parcel to which to write. 1002 */ writeAccessibilityRecordToParcel(AccessibilityRecord record, Parcel parcel, int flags)1003 private void writeAccessibilityRecordToParcel(AccessibilityRecord record, Parcel parcel, 1004 int flags) { 1005 parcel.writeInt(record.mBooleanProperties); 1006 parcel.writeInt(record.mCurrentItemIndex); 1007 parcel.writeInt(record.mItemCount); 1008 parcel.writeInt(record.mFromIndex); 1009 parcel.writeInt(record.mToIndex); 1010 parcel.writeInt(record.mScrollX); 1011 parcel.writeInt(record.mScrollY); 1012 parcel.writeInt(record.mMaxScrollX); 1013 parcel.writeInt(record.mMaxScrollY); 1014 parcel.writeInt(record.mAddedCount); 1015 parcel.writeInt(record.mRemovedCount); 1016 TextUtils.writeToParcel(record.mClassName, parcel, flags); 1017 TextUtils.writeToParcel(record.mContentDescription, parcel, flags); 1018 TextUtils.writeToParcel(record.mBeforeText, parcel, flags); 1019 parcel.writeParcelable(record.mParcelableData, flags); 1020 parcel.writeList(record.mText); 1021 parcel.writeInt(record.mSourceWindowId); 1022 parcel.writeLong(record.mSourceNodeId); 1023 parcel.writeInt(record.mSealed ? 1 : 0); 1024 } 1025 1026 /** 1027 * {@inheritDoc} 1028 */ describeContents()1029 public int describeContents() { 1030 return 0; 1031 } 1032 1033 @Override toString()1034 public String toString() { 1035 StringBuilder builder = new StringBuilder(); 1036 builder.append("EventType: ").append(eventTypeToString(mEventType)); 1037 builder.append("; EventTime: ").append(mEventTime); 1038 builder.append("; PackageName: ").append(mPackageName); 1039 builder.append("; MovementGranularity: ").append(mMovementGranularity); 1040 builder.append("; Action: ").append(mAction); 1041 builder.append(super.toString()); 1042 if (DEBUG) { 1043 builder.append("\n"); 1044 builder.append("; sourceWindowId: ").append(mSourceWindowId); 1045 builder.append("; mSourceNodeId: ").append(mSourceNodeId); 1046 for (int i = 0; i < mRecords.size(); i++) { 1047 AccessibilityRecord record = mRecords.get(i); 1048 builder.append(" Record "); 1049 builder.append(i); 1050 builder.append(":"); 1051 builder.append(" [ ClassName: " + record.mClassName); 1052 builder.append("; Text: " + record.mText); 1053 builder.append("; ContentDescription: " + record.mContentDescription); 1054 builder.append("; ItemCount: " + record.mItemCount); 1055 builder.append("; CurrentItemIndex: " + record.mCurrentItemIndex); 1056 builder.append("; IsEnabled: " + record.isEnabled()); 1057 builder.append("; IsPassword: " + record.isPassword()); 1058 builder.append("; IsChecked: " + record.isChecked()); 1059 builder.append("; IsFullScreen: " + record.isFullScreen()); 1060 builder.append("; Scrollable: " + record.isScrollable()); 1061 builder.append("; BeforeText: " + record.mBeforeText); 1062 builder.append("; FromIndex: " + record.mFromIndex); 1063 builder.append("; ToIndex: " + record.mToIndex); 1064 builder.append("; ScrollX: " + record.mScrollX); 1065 builder.append("; ScrollY: " + record.mScrollY); 1066 builder.append("; AddedCount: " + record.mAddedCount); 1067 builder.append("; RemovedCount: " + record.mRemovedCount); 1068 builder.append("; ParcelableData: " + record.mParcelableData); 1069 builder.append(" ]"); 1070 builder.append("\n"); 1071 } 1072 } else { 1073 builder.append("; recordCount: ").append(getRecordCount()); 1074 } 1075 return builder.toString(); 1076 } 1077 1078 /** 1079 * Returns the string representation of an event type. For example, 1080 * {@link #TYPE_VIEW_CLICKED} is represented by the string TYPE_VIEW_CLICKED. 1081 * 1082 * @param eventType The event type 1083 * @return The string representation. 1084 */ eventTypeToString(int eventType)1085 public static String eventTypeToString(int eventType) { 1086 switch (eventType) { 1087 case TYPE_VIEW_CLICKED: 1088 return "TYPE_VIEW_CLICKED"; 1089 case TYPE_VIEW_LONG_CLICKED: 1090 return "TYPE_VIEW_LONG_CLICKED"; 1091 case TYPE_VIEW_SELECTED: 1092 return "TYPE_VIEW_SELECTED"; 1093 case TYPE_VIEW_FOCUSED: 1094 return "TYPE_VIEW_FOCUSED"; 1095 case TYPE_VIEW_TEXT_CHANGED: 1096 return "TYPE_VIEW_TEXT_CHANGED"; 1097 case TYPE_WINDOW_STATE_CHANGED: 1098 return "TYPE_WINDOW_STATE_CHANGED"; 1099 case TYPE_VIEW_HOVER_ENTER: 1100 return "TYPE_VIEW_HOVER_ENTER"; 1101 case TYPE_VIEW_HOVER_EXIT: 1102 return "TYPE_VIEW_HOVER_EXIT"; 1103 case TYPE_NOTIFICATION_STATE_CHANGED: 1104 return "TYPE_NOTIFICATION_STATE_CHANGED"; 1105 case TYPE_TOUCH_EXPLORATION_GESTURE_START: 1106 return "TYPE_TOUCH_EXPLORATION_GESTURE_START"; 1107 case TYPE_TOUCH_EXPLORATION_GESTURE_END: 1108 return "TYPE_TOUCH_EXPLORATION_GESTURE_END"; 1109 case TYPE_WINDOW_CONTENT_CHANGED: 1110 return "TYPE_WINDOW_CONTENT_CHANGED"; 1111 case TYPE_VIEW_TEXT_SELECTION_CHANGED: 1112 return "TYPE_VIEW_TEXT_SELECTION_CHANGED"; 1113 case TYPE_VIEW_SCROLLED: 1114 return "TYPE_VIEW_SCROLLED"; 1115 case TYPE_ANNOUNCEMENT: 1116 return "TYPE_ANNOUNCEMENT"; 1117 case TYPE_VIEW_ACCESSIBILITY_FOCUSED: 1118 return "TYPE_VIEW_ACCESSIBILITY_FOCUSED"; 1119 case TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: 1120 return "TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED"; 1121 case TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY: 1122 return "TYPE_CURRENT_AT_GRANULARITY_MOVEMENT_CHANGED"; 1123 default: 1124 return null; 1125 } 1126 } 1127 1128 /** 1129 * @see Parcelable.Creator 1130 */ 1131 public static final Parcelable.Creator<AccessibilityEvent> CREATOR = 1132 new Parcelable.Creator<AccessibilityEvent>() { 1133 public AccessibilityEvent createFromParcel(Parcel parcel) { 1134 AccessibilityEvent event = AccessibilityEvent.obtain(); 1135 event.initFromParcel(parcel); 1136 return event; 1137 } 1138 1139 public AccessibilityEvent[] newArray(int size) { 1140 return new AccessibilityEvent[size]; 1141 } 1142 }; 1143 } 1144