Java Code Examples for android.view.accessibility.AccessibilityEvent#setEnabled()

public static void makeAnnouncement(View view, CharSequence announcement) {
    if (view == null)
        return;
    if (SUtils.isApi_16_OrHigher()) {
        view.announceForAccessibility(announcement);
    } else {
        // For API 15 and earlier, we need to construct an accessibility event
        Context ctx = view.getContext();
        AccessibilityManager am = (AccessibilityManager) ctx.getSystemService(
                Context.ACCESSIBILITY_SERVICE);
        if (!am.isEnabled()) return;

        AccessibilityEvent event = AccessibilityEvent.obtain(
                AccessibilityEvent.TYPE_NOTIFICATION_STATE_CHANGED);
        AccessibilityRecordCompat arc = AccessibilityEventCompat.asRecord(event);
        arc.setSource(view);
        event.setClassName(view.getClass().getName());
        event.setPackageName(view.getContext().getPackageName());
        event.setEnabled(view.isEnabled());
        event.getText().add(announcement);
        am.sendAccessibilityEvent(event);
    }
}
 

/**
 * Constructs and returns an {@link AccessibilityEvent} populated with
 * information about the specified item.
 *
 * @param virtualViewId The virtual view id for the item for which to
 *            construct an event.
 * @param eventType The type of event to construct.
 * @return An {@link AccessibilityEvent} populated with information about
 *         the specified item.
 */
private AccessibilityEvent createEventForChild(int virtualViewId, int eventType) {
    final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
    event.setEnabled(true);
    event.setClassName(DEFAULT_CLASS_NAME);

    // Allow the client to populate the event.
    onPopulateEventForVirtualView(virtualViewId, event);

    // Make sure the developer is following the rules.
    if (event.getText().isEmpty() && (event.getContentDescription() == null)) {
        throw new RuntimeException("Callbacks must add text or a content description in "
                + "populateEventForVirtualViewId()");
    }

    // Don't allow the client to override these properties.
    event.setPackageName(mView.getContext().getPackageName());

    final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event);
    record.setSource(mView, virtualViewId);

    return event;
}
 

/**
 * Constructs and returns an {@link AccessibilityEvent} populated with
 * information about the specified item.
 *
 * @param virtualViewId The virtual view id for the item for which to
 *            construct an event.
 * @param eventType The type of event to construct.
 * @return An {@link AccessibilityEvent} populated with information about
 *         the specified item.
 */
private AccessibilityEvent createEventForChild(int virtualViewId, int eventType) {
    final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
    event.setEnabled(true);
    event.setClassName(DEFAULT_CLASS_NAME);

    // Allow the client to populate the event.
    onPopulateEventForVirtualView(virtualViewId, event);

    // Make sure the developer is following the rules.
    if (event.getText().isEmpty() && (event.getContentDescription() == null)) {
        throw new RuntimeException("Callbacks must add text or a content description in "
                + "populateEventForVirtualViewId()");
    }

    // Don't allow the client to override these properties.
    event.setPackageName(mView.getContext().getPackageName());

    final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event);
    record.setSource(mView, virtualViewId);

    return event;
}
 

@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
    super.onInitializeAccessibilityEvent(event);
    event.setScrollable(isScrollableForAccessibility());
    View selectedView = getSelectedView();
    if (selectedView != null) {
        event.setEnabled(selectedView.isEnabled());
    }
    event.setCurrentItemIndex(getSelectedItemPosition());
    event.setFromIndex(getFirstVisiblePosition());
    event.setToIndex(getLastVisiblePosition());
    event.setItemCount(getCount());
}
 

private void sendAccessibilityEvent(int eventType, int virtualId) {
    AccessibilityEvent event = AccessibilityEvent.obtain();
    event.setEventType(eventType);
    event.setSource(this, virtualId);
    event.setEnabled(true);
    event.setPackageName(getContext().getPackageName());
    if (VERBOSE) {
        Log.v(TAG, "sendAccessibilityEvent(" + eventType + ", " + virtualId + "): " + event);
    }
    getContext().getSystemService(AccessibilityManager.class).sendAccessibilityEvent(event);
}
 

@CalledByNative
private void setAccessibilityEventBooleanAttributes(AccessibilityEvent event,
        boolean checked, boolean enabled, boolean password, boolean scrollable) {
    event.setChecked(checked);
    event.setEnabled(enabled);
    event.setPassword(password);
    event.setScrollable(scrollable);
}
 

private void sendAccessibilityEventForVirtualButton(int virtualViewId, int eventType,
                                                    String text) {
    if (((AccessibilityManager) getContext().getSystemService(Context.ACCESSIBILITY_SERVICE)).isEnabled()) {
        AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
        event.setClassName(Button.class.getName());
        event.setPackageName(getContext().getPackageName());
        event.getText().add(text);
        event.setEnabled(TextPicker.this.isEnabled());
        event.setSource(TextPicker.this, virtualViewId);
        requestSendAccessibilityEvent(TextPicker.this, event);
    }
}
 

@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
    boolean populated = false;
    // This is an exceptional case which occurs when a window gets the
    // focus and sends a focus event via its focused child to announce
    // current focus/selection. AdapterView fires selection but not focus
    // events so we change the event type here.
    if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED) {
        event.setEventType(AccessibilityEvent.TYPE_VIEW_SELECTED);
    }

    // we send selection events only from AdapterView to avoid
    // generation of such event for each child
    View selectedView = getSelectedView();
    if (selectedView != null) {
        populated = selectedView.dispatchPopulateAccessibilityEvent(event);
    }

    if (!populated) {
        if (selectedView != null) {
            event.setEnabled(selectedView.isEnabled());
        }
        event.setItemCount(getCount());
        event.setCurrentItemIndex(getSelectedItemPosition());
    }

    return populated;
}
 

private void sendAccessibilityEventForVirtualButton(int virtualViewId, int eventType, String text) {
    AccessibilityManager acm = (AccessibilityManager) getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
    if (acm.isEnabled()) {
        AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
        event.setClassName(Button.class.getName());
        event.setPackageName(getContext().getPackageName());
        event.getText().add(text);
        event.setEnabled(NumberPicker.this.isEnabled());
        event.setSource(NumberPicker.this, virtualViewId);
        requestSendAccessibilityEvent(NumberPicker.this, event);
    }
}
 

@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
    super.onInitializeAccessibilityEvent(event);
    event.setScrollable(isScrollableForAccessibility());
    View selectedView = getSelectedView();
    if (selectedView != null) {
        event.setEnabled(selectedView.isEnabled());
    }
    event.setCurrentItemIndex(getSelectedItemPosition());
    event.setFromIndex(getFirstVisiblePosition());
    event.setToIndex(getLastVisiblePosition());
    event.setItemCount(getCount());
}
 

private void sendAccessibilityEventForVirtualButton(int virtualViewId, int eventType,
                                                    String text) {
    //if (AccessibilityManager.getInstance(mContext).isEnabled()) {
    if (accessibilityManager != null && accessibilityManager.isEnabled()) {
        AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
        event.setClassName(Button.class.getName());
        event.setPackageName(getContext().getPackageName());
        event.getText().add(text);
        event.setEnabled(NumberPicker.this.isEnabled());
        AccessibilityRecordCompat.setSource(event, NumberPicker.this, virtualViewId);
        //event.setSource(NumberPicker.this, virtualViewId);
        requestSendAccessibilityEvent(NumberPicker.this, event);
    }
}
 

@Override
public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
	boolean populated = false;
	// This is an exceptional case which occurs when a window gets the
	// focus and sends a focus event via its focused child to announce
	// current focus/selection. AdapterView fires selection but not focus
	// events so we change the event type here.
	if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED) {
		event.setEventType(AccessibilityEvent.TYPE_VIEW_SELECTED);
	}
       
	// we send selection events only from AdapterView to avoid
	// generation of such event for each child
	View selectedView = getSelectedView();
	if (selectedView != null) {
		populated = selectedView.dispatchPopulateAccessibilityEvent(event);
	}
       
	if (!populated) {
		if (selectedView != null) {
			event.setEnabled(selectedView.isEnabled());
		}
		event.setItemCount(getCount());
		event.setCurrentItemIndex(getSelectedItemPosition());
	}
       
	return populated;
}
 

@TargetApi(14)
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
    super.onInitializeAccessibilityEvent(event);
    event.setClassName(AdapterView.class.getName());
    event.setScrollable(isScrollableForAccessibility());
    View selectedView = getSelectedView();
    if (selectedView != null) {
        event.setEnabled(selectedView.isEnabled());
    }
    event.setCurrentItemIndex(getSelectedItemPosition());
    event.setFromIndex(getFirstVisiblePosition());
    event.setToIndex(getLastVisiblePosition());
    event.setItemCount(getCount());
}
 

/**
 * 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);
}
 

/**
 * Creates and populates an {@link AccessibilityEvent} for the specified key
 * and event type.
 *
 * @param key A key on the host keyboard view.
 * @param eventType The event type to create.
 * @return A populated {@link AccessibilityEvent} for the key.
 * @see AccessibilityEvent
 */
public AccessibilityEvent createAccessibilityEvent(final Key key, final int eventType) {
    final int virtualViewId = getVirtualViewIdOf(key);
    final String keyDescription = getKeyDescription(key);
    final AccessibilityEvent event = AccessibilityEvent.obtain(eventType);
    event.setPackageName(mKeyboardView.getContext().getPackageName());
    event.setClassName(key.getClass().getName());
    event.setContentDescription(keyDescription);
    event.setEnabled(true);
    final AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event);
    record.setSource(mKeyboardView, virtualViewId);
    return event;
}
 

private void sendAccessibilityEvent(int eventType, int virtualId) {
    AccessibilityEvent event = AccessibilityEvent.obtain();
    event.setEventType(eventType);
    event.setSource(this, virtualId);
    event.setEnabled(true);
    event.setPackageName(getContext().getPackageName());
    if (VERBOSE) {
        Log.v(TAG, "sendAccessibilityEvent(" + eventType + ", " + virtualId + "): " + event);
    }
    getContext().getSystemService(AccessibilityManager.class).sendAccessibilityEvent(event);
}
 

public void onInitializeAccessibilityEvent(AccessibilityEvent paramAccessibilityEvent) {
	super.onInitializeAccessibilityEvent(paramAccessibilityEvent);
	paramAccessibilityEvent.setScrollable(isScrollableForAccessibility());
	View localView = getSelectedView();
	if (localView != null)
		paramAccessibilityEvent.setEnabled(localView.isEnabled());
	paramAccessibilityEvent.setCurrentItemIndex(getSelectedItemPosition());
	paramAccessibilityEvent.setFromIndex(getFirstVisiblePosition());
	paramAccessibilityEvent.setToIndex(getLastVisiblePosition());
	paramAccessibilityEvent.setItemCount(getCount());
}
 

/** @hide */
@Override
public void onInitializeAccessibilityEventInternal(AccessibilityEvent event) {
    super.onInitializeAccessibilityEventInternal(event);
    event.setScrollable(isScrollableForAccessibility());
    View selectedView = getSelectedView();
    if (selectedView != null) {
        event.setEnabled(selectedView.isEnabled());
    }
    event.setCurrentItemIndex(getSelectedItemPosition());
    event.setFromIndex(getFirstVisiblePosition());
    event.setToIndex(getLastVisiblePosition());
    event.setItemCount(getCount());
}
 

@CalledByNative
private void setAccessibilityEventBooleanAttributes(AccessibilityEvent event,
        boolean checked, boolean enabled, boolean password, boolean scrollable) {
    event.setChecked(checked);
    event.setEnabled(enabled);
    event.setPassword(password);
    event.setScrollable(scrollable);
}
 

@Override
protected void populateEventForItem(RadialMenuItem item, AccessibilityEvent event) {
  event.setContentDescription(item.getTitle());
  event.setChecked(item.isChecked());
  event.setEnabled(item.isEnabled());
}