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

private static void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[AccessibilityNodeInfoCompat.ACTION_NEXT_HTML_ELEMENT];
    while (true) {
        int read = in.read(buffer);
        if (read != -1) {
            out.write(buffer, 0, read);
        } else {
            return;
        }
    }
}
 

@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();
  }
}
 

/**
 * Sends an instruction to ChromeVox to read the specified HTML element in
 * the given direction within a node.
 * <p>
 * WARNING: Calling this method with a source node of
 * {@link android.webkit.WebView} has the side effect of closing the IME
 * if currently displayed.
 *
 * @param node The node containing web content with ChromeVox to which the
 *            message should be sent
 * @param direction {@link #DIRECTION_FORWARD} or
 *            {@link #DIRECTION_BACKWARD}
 * @param htmlElement The HTML tag to send
 * @return {@code true} if the action was performed, {@code false}
 *         otherwise.
 */
public static boolean performNavigationToHtmlElementAction(
        AccessibilityNodeInfoCompat node, int direction, String htmlElement) {
    final int action = (direction == DIRECTION_FORWARD)
            ? AccessibilityNodeInfoCompat.ACTION_NEXT_HTML_ELEMENT
            : AccessibilityNodeInfoCompat.ACTION_PREVIOUS_HTML_ELEMENT;
    final Bundle args = new Bundle();
    args.putString(
            AccessibilityNodeInfoCompat.ACTION_ARGUMENT_HTML_ELEMENT_STRING, htmlElement);
    return node.performAction(action, args);
}
 

/**
 * Sends an instruction to ChromeVox to navigate by DOM object in
 * the given direction within a node.
 *
 * @param node The node containing web content with ChromeVox to which the
 *            message should be sent
 * @param direction {@link #DIRECTION_FORWARD} or
 *            {@link #DIRECTION_BACKWARD}
 * @return {@code true} if the action was performed, {@code false}
 *         otherwise.
 */
public static boolean performNavigationByDOMObject(
        AccessibilityNodeInfoCompat node, int direction) {
    final int action = (direction == DIRECTION_FORWARD)
            ? AccessibilityNodeInfoCompat.ACTION_NEXT_HTML_ELEMENT
            : AccessibilityNodeInfoCompat.ACTION_PREVIOUS_HTML_ELEMENT;
    return node.performAction(action);
}