Example usage for android.view.accessibility AccessibilityEvent TYPE_VIEW_ACCESSIBILITY_FOCUS

Introduction

In this page you can find the example usage for android.view.accessibility AccessibilityEvent TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED.

Prototype

int TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED

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Document

Represents the event of clearing accessibility focus.

Usage

From source file:com.android.utils.AccessibilityEventUtils.java

public static int[] getAllEventTypes() {
    return new int[] { AccessibilityEvent.TYPE_ANNOUNCEMENT, AccessibilityEvent.TYPE_ASSIST_READING_CONTEXT,
            AccessibilityEvent.TYPE_GESTURE_DETECTION_END, AccessibilityEvent.TYPE_GESTURE_DETECTION_START,
            AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED,
            AccessibilityEvent.TYPE_TOUCH_EXPLORATION_GESTURE_END,
            AccessibilityEvent.TYPE_TOUCH_EXPLORATION_GESTURE_START,
            AccessibilityEvent.TYPE_TOUCH_INTERACTION_END, AccessibilityEvent.TYPE_TOUCH_INTERACTION_START,
            AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED,
            AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED, AccessibilityEvent.TYPE_VIEW_CLICKED,
            AccessibilityEvent.TYPE_VIEW_CONTEXT_CLICKED, AccessibilityEvent.TYPE_VIEW_FOCUSED,
            AccessibilityEvent.TYPE_VIEW_HOVER_ENTER, AccessibilityEvent.TYPE_VIEW_HOVER_EXIT,
            AccessibilityEvent.TYPE_VIEW_LONG_CLICKED, AccessibilityEvent.TYPE_VIEW_SCROLLED,
            AccessibilityEvent.TYPE_VIEW_SELECTED, AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED,
            AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED,
            AccessibilityEvent.TYPE_VIEW_TEXT_TRAVERSED_AT_MOVEMENT_GRANULARITY,
            AccessibilityEvent.TYPE_WINDOWS_CHANGED, AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED,
            AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED };
}

From source file:com.android.yijiang.kzx.widget.betterpickers.TouchExplorationHelper.java

@Override
public boolean performAction(int virtualViewId, int action, Bundle arguments) {
    if (virtualViewId == View.NO_ID) {
        return ViewCompat.performAccessibilityAction(mParentView, action, arguments);
    }/*from w ww. j ava 2  s  .  c om*/

    final T item = getItemForId(virtualViewId);
    if (item == null) {
        return false;
    }

    boolean handled = false;

    switch (action) {
    case AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS:
        if (mFocusedItemId != virtualViewId) {
            mFocusedItemId = virtualViewId;
            sendEventForItem(item, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
            handled = true;
        }
        break;
    case AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS:
        if (mFocusedItemId == virtualViewId) {
            mFocusedItemId = INVALID_ID;
            sendEventForItem(item, AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
            handled = true;
        }
        break;
    }

    handled |= performActionForItem(item, action, arguments);

    return handled;
}

From source file:com.android.screenspeak.eventprocessor.AccessibilityEventProcessor.java

public void onAccessibilityEvent(AccessibilityEvent event) {
    if (mTestingListener != null) {
        mTestingListener.onAccessibilityEvent(event);
    }//from  ww w .j a  v a2 s . c  o m

    // Chrome clears and set a11y focus for each scroll event, it is not intended to be spoken
    // to the user. Remove this when chromium is fixed.
    int eventType = event.getEventType();
    if (eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED) {
        if (sGetSourceNodeIdMethod != null) {
            try {
                mLastClearedSourceId = (long) sGetSourceNodeIdMethod.invoke(event);
                mLastClearedWindowId = event.getWindowId();
                mLastClearA11yFocus = System.currentTimeMillis();
                if (mLastClearedSourceId != mLastPronouncedSourceId
                        || mLastClearedWindowId != mLastPronouncedWindowId) {
                    // something strange. not accessibility focused node sends clear focus event
                    // b/22108305
                    mLastClearedSourceId = -1;
                    mLastClearedWindowId = -1;
                    mLastClearA11yFocus = 0;
                }
            } catch (Exception e) {
                Log.d(LOGTAG, "Exception accessing field: " + e.toString());
            }
        }

        return;
    }

    if (eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
        if (System.currentTimeMillis() - mLastClearA11yFocus < CLEAR_SET_A11Y_FOCUS_WINDOW) {
            if (sGetSourceNodeIdMethod != null) {
                try {
                    long sourceId = (long) sGetSourceNodeIdMethod.invoke(event);
                    int windowId = event.getWindowId();
                    if (sourceId == mLastClearedSourceId && windowId == mLastClearedWindowId) {
                        return;
                    }
                    mLastPronouncedSourceId = sourceId;
                    mLastPronouncedWindowId = windowId;
                } catch (Exception e) {
                    Log.d(LOGTAG, "Exception accessing field: " + e.toString());
                }
            }
        }
    }

    if (shouldDropEvent(event)) {
        return;
    }

    maintainExplorationState(event);

    if (event.getEventType() == AccessibilityEvent.TYPE_WINDOW_CONTENT_CHANGED
            || event.getEventType() == AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED
            || event.getEventType() == AccessibilityEvent.TYPE_WINDOWS_CHANGED) {
        mService.setRootDirty(true);
    }

    processEvent(event);
}

From source file:com.android.talkback.eventprocessor.AccessibilityEventProcessor.java

/**
 * Returns whether the device should drop this event due to refocus issue.
 * Sometimes TalkBack will receive four consecutive events from one single node:.
 * 1. Accessibility_Focus_Cleared// w ww  . ja  va2  s  . co m
 * 2. Accessibility_Focused
 * 3. Accessibility_Focus_Cleared
 * 4. Accessibility_Focused
 * <p/>
 * The cause of this issue could be:
 * i. Chrome clears and set a11y focus for each scroll event.
 * If it is an action to navigate to previous/next element and causes view scrolling. The
 * first two events are caused by navigation, and the last two events are caused by chrome
 * refocus issue. The last two events are not intended to be spoken.
 * If it is a scroll action. It might cause a lot of a11y_focus_cleared and a11y_focused
 * events. In this case all the events are not intended to be spoken.
 * <p/>
 * ii. User taps on screen to refocus on the a11y focused node. In this case event 2 and 4
 * should be spoken to the user.
 *
 * @param event The current event.
 * @return {@code true} if the event should be dropped.
 */
private boolean shouldDropRefocusEvent(AccessibilityEvent event) {
    int eventType = event.getEventType();
    if (eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED) {
        if (sGetSourceNodeIdMethod != null) {
            try {
                mLastClearedSourceId = (long) sGetSourceNodeIdMethod.invoke(event);
                mLastClearedWindowId = event.getWindowId();
                mLastClearA11yFocus = System.currentTimeMillis();
                if (mLastClearedSourceId != mLastPronouncedSourceId
                        || mLastClearedWindowId != mLastPronouncedWindowId
                        || mProcessorFocusAndSingleTap.isFromRefocusAction(event)) {
                    // something strange. not accessibility focused node sends clear focus event
                    // BUG
                    mLastClearedSourceId = -1;
                    mLastClearedWindowId = -1;
                    mLastClearA11yFocus = 0;
                }
            } catch (Exception e) {
                Log.d(LOGTAG, "Exception accessing field: " + e.toString());
            }
        }
        return true;
    }

    if (eventType == AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED) {
        if (sGetSourceNodeIdMethod != null
                && !EventState.getInstance().checkAndClearRecentEvent(EventState.EVENT_NODE_REFOCUSED)) {
            try {
                long sourceId = (long) sGetSourceNodeIdMethod.invoke(event);
                int windowId = event.getWindowId();
                // If this event is fired by the "clear and set a11y focus" issue of Chrome,
                // ignore and don't speak to the user, otherwise update the node and window IDs
                // and then process the event.
                if (System.currentTimeMillis() - mLastClearA11yFocus < CLEAR_SET_A11Y_FOCUS_WINDOW
                        && sourceId == mLastClearedSourceId && windowId == mLastClearedWindowId) {
                    return true;
                } else {
                    mLastPronouncedSourceId = sourceId;
                    mLastPronouncedWindowId = windowId;
                }
            } catch (Exception e) {
                Log.d(LOGTAG, "Exception accessing field: " + e.toString());
            }
        }
    }
    return false;
}

From source file:com.android.talkback.eventprocessor.ProcessorFocusAndSingleTap.java

public boolean isFromRefocusAction(AccessibilityEvent event) {
    long eventTime = event.getEventTime();
    int eventType = event.getEventType();
    if (eventType != AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED
            && eventType != AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED) {
        return false;
    }/*from  w w  w.  j a  va2s .c  o  m*/
    AccessibilityNodeInfo source = event.getSource();
    try {
        return mLastRefocusStartTime < eventTime
                && (mLastRefocusEndTime > eventTime || mLastRefocusEndTime < mLastRefocusStartTime)
                && mLastRefocusedNode != null && mLastRefocusedNode.getInfo().equals(source);
    } finally {
        if (source != null) {
            source.recycle();
        }
    }
}

Example usage for android.view.accessibility AccessibilityEvent TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED

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Usage