android.view.ViewParent#requestSendAccessibilityEvent ( )源码实例Demo

/**
 * Sends the specified text to the {@link AccessibilityManager} to be
 * spoken.
 *
 * @param view The source view.
 * @param text The text to speak.
 */
public void announceForAccessibility(final View view, final CharSequence text) {
    if (!mAccessibilityManager.isEnabled()) {
        Log.e(TAG, "Attempted to speak when accessibility was disabled!");
        return;
    }

    // The following is a hack to avoid using the heavy-weight TextToSpeech
    // class. Instead, we're just forcing a fake AccessibilityEvent into
    // the screen reader to make it speak.
    final AccessibilityEvent event = AccessibilityEvent.obtain();

    event.setPackageName(PACKAGE);
    event.setClassName(CLASS);
    event.setEventTime(SystemClock.uptimeMillis());
    event.setEnabled(true);
    event.getText().add(text);

    // Platforms starting at SDK version 16 (Build.VERSION_CODES.JELLY_BEAN) should use
    // announce events.
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        event.setEventType(AccessibilityEventCompat.TYPE_ANNOUNCEMENT);
    } else {
        event.setEventType(AccessibilityEvent.TYPE_VIEW_FOCUSED);
    }

    final ViewParent viewParent = view.getParent();
    if ((viewParent == null) || !(viewParent instanceof ViewGroup)) {
        Log.e(TAG, "Failed to obtain ViewParent in announceForAccessibility");
        return;
    }

    viewParent.requestSendAccessibilityEvent(view, event);
}
 

/**
 * Sends a window state change event with the specified text.
 *
 * @param text The text to send with the event.
 */
protected void sendWindowStateChanged(final String text) {
    final AccessibilityEvent stateChange = AccessibilityEvent.obtain(
            AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    mKeyboardView.onInitializeAccessibilityEvent(stateChange);
    stateChange.getText().add(text);
    stateChange.setContentDescription(null);

    final ViewParent parent = mKeyboardView.getParent();
    if (parent != null) {
        parent.requestSendAccessibilityEvent(mKeyboardView, stateChange);
    }
}
 

/**
 * @param view the View to trigger the accessibility event
 * @param msg text that will be read aloud (if accessibility enabled)
 */
public static void announceForAccessibility(View view, String msg)
{
    if (view != null && msg != null)
    {
        if (Build.VERSION.SDK_INT >= 16)
        {
            view.announceForAccessibility(msg);

        } else {
            Context context = view.getContext();
            if (context != null)
            {
                AccessibilityManager accesibility = (AccessibilityManager) context.getSystemService(Context.ACCESSIBILITY_SERVICE);
                if (accesibility != null && accesibility.isEnabled())
                {
                    AccessibilityEvent event = AccessibilityEvent.obtain(AccessibilityEvent.TYPE_VIEW_FOCUSED);
                    event.getText().add(msg);
                    event.setEnabled(view.isEnabled());
                    event.setClassName(view.getClass().getName());
                    event.setPackageName(context.getPackageName());

                    ViewParent parent = view.getParent();
                    if (Build.VERSION.SDK_INT >= 14 && parent != null)
                    {
                        parent.requestSendAccessibilityEvent(view, event);

                    } else {
                        accesibility.sendAccessibilityEvent(event);
                    }
                }
            }
        }
    }
}
 

/**
 * Sends the specified text to the {@link AccessibilityManager} to be
 * spoken.
 *
 * @param view The source view.
 * @param text The text to speak.
 */
public void announceForAccessibility(final View view, final CharSequence text) {
    if (!mAccessibilityManager.isEnabled()) {
        Log.e(TAG, "Attempted to speak when accessibility was disabled!");
        return;
    }

    // The following is a hack to avoid using the heavy-weight TextToSpeech
    // class. Instead, we're just forcing a fake AccessibilityEvent into
    // the screen reader to make it speak.
    final AccessibilityEvent event = AccessibilityEvent.obtain();

    event.setPackageName(PACKAGE);
    event.setClassName(CLASS);
    event.setEventTime(SystemClock.uptimeMillis());
    event.setEnabled(true);
    event.getText().add(text);

    // Platforms starting at SDK version 16 (Build.VERSION_CODES.JELLY_BEAN) should use
    // announce events.
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        event.setEventType(AccessibilityEventCompat.TYPE_ANNOUNCEMENT);
    } else {
        event.setEventType(AccessibilityEvent.TYPE_VIEW_FOCUSED);
    }

    final ViewParent viewParent = view.getParent();
    if ((viewParent == null) || !(viewParent instanceof ViewGroup)) {
        Log.e(TAG, "Failed to obtain ViewParent in announceForAccessibility");
        return;
    }

    viewParent.requestSendAccessibilityEvent(view, event);
}
 

/**
 * Sends a window state change event with the specified text.
 *
 * @param text The text to send with the event.
 */
protected void sendWindowStateChanged(final String text) {
    final AccessibilityEvent stateChange = AccessibilityEvent.obtain(
            AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED);
    mKeyboardView.onInitializeAccessibilityEvent(stateChange);
    stateChange.getText().add(text);
    stateChange.setContentDescription(null);

    final ViewParent parent = mKeyboardView.getParent();
    if (parent != null) {
        parent.requestSendAccessibilityEvent(mKeyboardView, stateChange);
    }
}
 

public static boolean requestSendAccessibilityEvent(ViewParent viewparent, View view, AccessibilityEvent accessibilityevent)
{
    return viewparent.requestSendAccessibilityEvent(view, accessibilityevent);
}
 

public static boolean requestSendAccessibilityEvent(
        ViewParent parent, View child, AccessibilityEvent event) {
    return parent.requestSendAccessibilityEvent(child, event);
}
 

public static boolean requestSendAccessibilityEvent(
        ViewParent parent, View child, AccessibilityEvent event) {
    return parent.requestSendAccessibilityEvent(child, event);
}
 

public static boolean requestSendAccessibilityEvent(
        ViewParent parent, View child, AccessibilityEvent event) {
    return parent.requestSendAccessibilityEvent(child, event);
}