android.support.v4.view.accessibility.AccessibilityNodeInfoCompat#getActionList ( )源码实例Demo

/**
 * Returns whether a node is actionable. That is, the node supports one of
 * {@link AccessibilityNodeInfoCompat#isClickable()},
 * {@link AccessibilityNodeInfoCompat#isFocusable()}, or
 * {@link AccessibilityNodeInfoCompat#isLongClickable()}.
 *
 * @param node The {@link AccessibilityNodeInfoCompat} to evaluate
 * @return {@code true} if node is actionable.
 */
public static boolean isActionableForAccessibility(@Nullable AccessibilityNodeInfoCompat node) {
  if (node == null) {
    return false;
  }

  if (node.isClickable() || node.isLongClickable() || node.isFocusable()) {
    return true;
  }

  List actionList = node.getActionList();
  return
      actionList.contains(AccessibilityNodeInfoCompat.ACTION_CLICK) ||
          actionList.contains(AccessibilityNodeInfoCompat.ACTION_LONG_CLICK) ||
          actionList.contains(AccessibilityNodeInfoCompat.ACTION_FOCUS);
}
 

/**
 * Determines whether the provided {@link View} and {@link AccessibilityNodeInfoCompat} is a
 * top-level item in a scrollable container.
 *
 * @param view The {@link View} to evaluate
 * @param node The {@link AccessibilityNodeInfoCompat} to evaluate
 * @return {@code true} if it is a top-level item in a scrollable container.
 */
public static boolean isTopLevelScrollItem(
    @Nullable AccessibilityNodeInfoCompat node,
    @Nullable View view) {
  if (node == null || view == null) {
    return false;
  }

  View parent = (View) ViewCompat.getParentForAccessibility(view);
  if (parent == null) {
    return false;
  }

  if (node.isScrollable()) {
    return true;
  }

  List actionList = node.getActionList();
  if (actionList.contains(AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD) ||
      actionList.contains(AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD)) {
    return true;
  }

  // AdapterView, ScrollView, and HorizontalScrollView are focusable
  // containers, but Spinner is a special case.
  if (parent instanceof Spinner) {
    return false;
  }

  return
      parent instanceof AdapterView ||
          parent instanceof ScrollView ||
          parent instanceof HorizontalScrollView;
}
 

@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();
  }
}