android.support.v4.view.accessibility.AccessibilityNodeInfoCompat#ACTION_LONG_CLICK源码实例Demo

/**
 * Performs the specified accessibility action for the given key.
 *
 * @param key The on which to perform the action.
 * @param action The action to perform.
 * @return The result of performing the action, or false if the action is not supported.
 */
boolean performActionForKey(final Key key, final int action) {
    switch (action) {
    case AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS:
        mAccessibilityFocusedView = getVirtualViewIdOf(key);
        sendAccessibilityEventForKey(
                key, AccessibilityEventCompat.TYPE_VIEW_ACCESSIBILITY_FOCUSED);
        return true;
    case AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS:
        mAccessibilityFocusedView = UNDEFINED;
        sendAccessibilityEventForKey(
                key, AccessibilityEventCompat.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED);
        return true;
    case AccessibilityNodeInfoCompat.ACTION_CLICK:
        sendAccessibilityEventForKey(key, AccessibilityEvent.TYPE_VIEW_CLICKED);
        mDelegate.performClickOn(key);
        return true;
    case AccessibilityNodeInfoCompat.ACTION_LONG_CLICK:
        sendAccessibilityEventForKey(key, AccessibilityEvent.TYPE_VIEW_LONG_CLICKED);
        mDelegate.performLongClickOn(key);
        return true;
    default:
        return false;
    }
}
 

@Nullable
public static String getActions(View view) {
  AccessibilityNodeInfoCompat node = createNodeInfoFromView(view);
  try {
    final StringBuilder actionLabels = new StringBuilder();
    final String separator = ", ";

    for (AccessibilityActionCompat action : node.getActionList()) {
      if (actionLabels.length() > 0) {
        actionLabels.append(separator);
      }
      switch (action.getId()) {
        case AccessibilityNodeInfoCompat.ACTION_FOCUS:
          actionLabels.append("focus");
          break;
        case AccessibilityNodeInfoCompat.ACTION_CLEAR_FOCUS:
          actionLabels.append("clear-focus");
          break;
        case AccessibilityNodeInfoCompat.ACTION_SELECT:
          actionLabels.append("select");
          break;
        case AccessibilityNodeInfoCompat.ACTION_CLEAR_SELECTION:
          actionLabels.append("clear-selection");
          break;
        case AccessibilityNodeInfoCompat.ACTION_CLICK:
          actionLabels.append("click");
          break;
        case AccessibilityNodeInfoCompat.ACTION_LONG_CLICK:
          actionLabels.append("long-click");
          break;
        case AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS:
          actionLabels.append("accessibility-focus");
          break;
        case AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS:
          actionLabels.append("clear-accessibility-focus");
          break;
        case AccessibilityNodeInfoCompat.ACTION_NEXT_AT_MOVEMENT_GRANULARITY:
          actionLabels.append("next-at-movement-granularity");
          break;
        case AccessibilityNodeInfoCompat.ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY:
          actionLabels.append("previous-at-movement-granularity");
          break;
        case AccessibilityNodeInfoCompat.ACTION_NEXT_HTML_ELEMENT:
          actionLabels.append("next-html-element");
          break;
        case AccessibilityNodeInfoCompat.ACTION_PREVIOUS_HTML_ELEMENT:
          actionLabels.append("previous-html-element");
          break;
        case AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD:
          actionLabels.append("scroll-forward");
          break;
        case AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD:
          actionLabels.append("scroll-backward");
          break;
        case AccessibilityNodeInfoCompat.ACTION_CUT:
          actionLabels.append("cut");
          break;
        case AccessibilityNodeInfoCompat.ACTION_COPY:
          actionLabels.append("copy");
          break;
        case AccessibilityNodeInfoCompat.ACTION_PASTE:
          actionLabels.append("paste");
          break;
        case AccessibilityNodeInfoCompat.ACTION_SET_SELECTION:
          actionLabels.append("set-selection");
          break;
        default:
          CharSequence label = action.getLabel();
          if (label != null) {
            actionLabels.append(label);
          } else {
            actionLabels.append("unknown");
          }
          break;
      }
    }

    return actionLabels.length() > 0 ? actionLabels.toString() : null;
  } finally {
    node.recycle();
  }
}
 

@Override
public boolean performAccessibilityAction( View host, int action, Bundle arguments ) {
	if ( super.performAccessibilityAction( host, action, arguments ) ) {
		return true;
	}

	final int position = getPositionForView( host );
	final ListAdapter adapter = getAdapter();

	if ( ( position == INVALID_POSITION ) || ( adapter == null ) ) {
		// Cannot perform actions on invalid items.
		return false;
	}

	if ( !isEnabled() || !adapter.isEnabled( position ) ) {
		// Cannot perform actions on disabled items.
		return false;
	}

	final long id = getItemIdAtPosition( position );

	switch ( action ) {
		case AccessibilityNodeInfoCompat.ACTION_CLEAR_SELECTION: {
			if ( getSelectedItemPosition() == position ) {
				setSelection( INVALID_POSITION );
				return true;
			}
		}
			return false;
		case AccessibilityNodeInfoCompat.ACTION_SELECT: {
			if ( getSelectedItemPosition() != position ) {
				setSelection( position );
				return true;
			}
		}
			return false;
		case AccessibilityNodeInfoCompat.ACTION_CLICK: {
			if ( isClickable() ) {
				return performItemClick( host, position, id );
			}
		}
			return false;
		case AccessibilityNodeInfoCompat.ACTION_LONG_CLICK: {
			if ( isLongClickable() ) {
				return performLongPress( host, position, id );
			}
		}
			return false;
	}

	return false;
}