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

/**
 * Returns whether the supplied {@link View} and {@link AccessibilityNodeInfoCompat} would
 * produce spoken feedback if it were accessibility focused.  NOTE: not all speaking nodes are
 * focusable.
 *
 * @param view The {@link View} to evaluate
 * @param node The {@link AccessibilityNodeInfoCompat} to evaluate
 * @return {@code true} if it meets the criterion for producing spoken feedback
 */
public static boolean isSpeakingNode(
    @Nullable AccessibilityNodeInfoCompat node,
    @Nullable View view) {
  if (node == null || view == null) {
    return false;
  }

  if (!node.isVisibleToUser()) {
    return false;
  }

  int important = ViewCompat.getImportantForAccessibility(view);
  if (important == ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS ||
      (important == ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_NO &&
          node.getChildCount() <= 0)) {
    return false;
  }

  return node.isCheckable() || hasText(node) || hasNonActionableSpeakingDescendants(node, view);
}
 

private static boolean isSpeakingNode(Context context, AccessibilityNodeInfoCompat node) {
    if (hasText(node)) {
        LogUtils.log(AccessibilityNodeInfoUtils.class, Log.VERBOSE,
                "Speaking, has text");
        return true;
    }

    // Special case for check boxes.
    if (node.isCheckable()) {
        LogUtils.log(AccessibilityNodeInfoUtils.class, Log.VERBOSE,
                "Speaking, is checkable");
        return true;
    }

    // Special case for web content.
    if (WebInterfaceUtils.supportsWebActions(node)) {
        LogUtils.log(AccessibilityNodeInfoUtils.class, Log.VERBOSE,
                "Speaking, has web content");
        return true;
    }

    // Special case for containers with non-focusable content.
    if (hasNonActionableSpeakingChildren(context, node)) {
        LogUtils.log(AccessibilityNodeInfoUtils.class, Log.VERBOSE,
                "Speaking, has non-actionable speaking children");
        return true;
    }

    return false;
}
 

@Override
public void format(Editable result,
        Context context,
        AccessibilityNodeInfoCompat node) {
    int oldLength = result.length();

    CharSequence text = null;

    AccessibilityNodeInfoCompat labeledBy = node.getLabeledBy();
    if (labeledBy != null) {
        text = LabelingUtils.getNodeText(labeledBy, getLabelManager());
        labeledBy.recycle();
    }
    if (text == null) {
        text = LabelingUtils.getNodeText(node, getLabelManager());
    }
    if (text == null) {
        text = "";
    }

    result.append(text);

    if (node.isCheckable() || node.isChecked()) {
        CharSequence mark;
        if (node.isChecked()) {
            mark = context.getString(R.string.checkmark_checked);
        } else {
            mark = context.getString(R.string.checkmark_not_checked);
        }
        StringUtils.appendWithSpaces(result, mark);
    }

    if (oldLength == result.length()
            && AccessibilityNodeInfoUtils.isActionableForAccessibility(
                node)) {
        result.append(getFallbackText(context, node));
    }
}
 

/**
 * Gets a description of the properties of a node.
 */
public static CharSequence nodeDebugDescription(AccessibilityNodeInfoCompat node) {
    StringBuilder sb = new StringBuilder();
    sb.append(node.getWindowId());

    if (node.getClassName() != null) {
        appendSimpleName(sb, node.getClassName());
    } else {
        sb.append("??");
    }

    if (!node.isVisibleToUser()) {
        sb.append(":invisible");
    }

    if (node.getText() != null) {
        sb.append(":");
        sb.append(node.getText().toString().trim());
    }

    if (node.getContentDescription() != null) {
        sb.append(":");
        sb.append(node.getContentDescription().toString().trim());
    }

    int actions = node.getActions();
    if (actions != 0) {
        sb.append(":");
        if ((actions & AccessibilityNodeInfoCompat.ACTION_FOCUS) != 0) {
            sb.append("F");
        }
        if ((actions & AccessibilityNodeInfoCompat.ACTION_ACCESSIBILITY_FOCUS) != 0) {
            sb.append("A");
        }
        if ((actions & AccessibilityNodeInfoCompat.ACTION_CLEAR_ACCESSIBILITY_FOCUS) != 0) {
            sb.append("a");
        }
        if ((actions & AccessibilityNodeInfoCompat.ACTION_SCROLL_BACKWARD) != 0) {
            sb.append("-");
        }
        if ((actions & AccessibilityNodeInfoCompat.ACTION_SCROLL_FORWARD) != 0) {
            sb.append("+");
        }
    }

    if (node.isCheckable()) {
        sb.append(":");
        if (node.isChecked()) {
            sb.append("(X)");
        } else {
            sb.append("( )");
        }
    }

    if (node.isFocusable()) {
        sb.append(":focusable");
    }

    if (node.isFocused()) {
        sb.append(":focused");
    }

    if (node.isSelected()) {
        sb.append(":selected");
    }

    if (node.isClickable()) {
        sb.append(":clickable");
    }

    if (node.isLongClickable()) {
        sb.append(":longClickable");
    }

    if (node.isAccessibilityFocused()) {
        sb.append(":accessibilityFocused");
    }

    if (!node.isEnabled()) {
        sb.append(":disabled");
    }

    return sb.toString();
}
 

@Nullable
public static String getFocusableReasons(View view) {
  AccessibilityNodeInfoCompat node = createNodeInfoFromView(view);
  try {
    boolean hasText = AccessibilityUtil.hasText(node);
    boolean isCheckable = node.isCheckable();
    boolean hasNonActionableSpeakingDescendants =
        AccessibilityUtil.hasNonActionableSpeakingDescendants(node, view);

    if (AccessibilityUtil.isActionableForAccessibility(node)) {
      if (node.getChildCount() <= 0) {
        return "View is actionable and has no children.";
      } else if (hasText) {
        return "View is actionable and has a description.";
      } else if (isCheckable) {
        return "View is actionable and checkable.";
      } else if (hasNonActionableSpeakingDescendants) {
        return "View is actionable and has non-actionable descendants with descriptions.";
      }
    }

    if (AccessibilityUtil.isTopLevelScrollItem(node, view)) {
      if (hasText) {
        return "View is a direct child of a scrollable container and has a description.";
      } else if (isCheckable) {
        return "View is a direct child of a scrollable container and is checkable.";
      } else if (hasNonActionableSpeakingDescendants) {
        return
            "View is a direct child of a scrollable container and has non-actionable " +
            "descendants with descriptions.";
      }
    }

    if (hasText) {
      return "View has a description and is not actionable, but has no actionable ancestor.";
    }

    return null;
  } finally {
    node.recycle();
  }
}