android.view.accessibility.AccessibilityNodeInfo#ROOT_ITEM_ID源码实例Demo

private void findAccessibilityNodeInfoByAccessibilityIdUiThread(Message message) {
    final int flags = message.arg1;

    SomeArgs args = (SomeArgs) message.obj;
    final int accessibilityViewId = args.argi1;
    final int virtualDescendantId = args.argi2;
    final int interactionId = args.argi3;
    final IAccessibilityInteractionConnectionCallback callback =
        (IAccessibilityInteractionConnectionCallback) args.arg1;
    final MagnificationSpec spec = (MagnificationSpec) args.arg2;
    final Region interactiveRegion = (Region) args.arg3;
    final Bundle arguments = (Bundle) args.arg4;

    args.recycle();

    List<AccessibilityNodeInfo> infos = mTempAccessibilityNodeInfoList;
    infos.clear();
    try {
        if (mViewRootImpl.mView == null || mViewRootImpl.mAttachInfo == null) {
            return;
        }
        mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = flags;
        View root = null;
        if (accessibilityViewId == AccessibilityNodeInfo.ROOT_ITEM_ID) {
            root = mViewRootImpl.mView;
        } else {
            root = findViewByAccessibilityId(accessibilityViewId);
        }
        if (root != null && isShown(root)) {
            mPrefetcher.prefetchAccessibilityNodeInfos(
                    root, virtualDescendantId, flags, infos, arguments);
        }
    } finally {
        updateInfosForViewportAndReturnFindNodeResult(
                infos, callback, interactionId, spec, interactiveRegion);
    }
}
 

private void focusSearchUiThread(Message message) {
    final int flags = message.arg1;
    final int accessibilityViewId = message.arg2;

    SomeArgs args = (SomeArgs) message.obj;
    final int direction = args.argi2;
    final int interactionId = args.argi3;
    final IAccessibilityInteractionConnectionCallback callback =
        (IAccessibilityInteractionConnectionCallback) args.arg1;
    final MagnificationSpec spec = (MagnificationSpec) args.arg2;
    final Region interactiveRegion = (Region) args.arg3;

    args.recycle();

    AccessibilityNodeInfo next = null;
    try {
        if (mViewRootImpl.mView == null || mViewRootImpl.mAttachInfo == null) {
            return;
        }
        mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = flags;
        View root = null;
        if (accessibilityViewId != AccessibilityNodeInfo.ROOT_ITEM_ID) {
            root = findViewByAccessibilityId(accessibilityViewId);
        } else {
            root = mViewRootImpl.mView;
        }
        if (root != null && isShown(root)) {
            View nextView = root.focusSearch(direction);
            if (nextView != null) {
                next = nextView.createAccessibilityNodeInfo();
            }
        }
    } finally {
        updateInfoForViewportAndReturnFindNodeResult(
                next, callback, interactionId, spec, interactiveRegion);
    }
}
 

private void findAccessibilityNodeInfosByViewIdUiThread(Message message) {
    final int flags = message.arg1;
    final int accessibilityViewId = message.arg2;

    SomeArgs args = (SomeArgs) message.obj;
    final int interactionId = args.argi1;
    final IAccessibilityInteractionConnectionCallback callback =
        (IAccessibilityInteractionConnectionCallback) args.arg1;
    final MagnificationSpec spec = (MagnificationSpec) args.arg2;
    final String viewId = (String) args.arg3;
    final Region interactiveRegion = (Region) args.arg4;
    args.recycle();

    final List<AccessibilityNodeInfo> infos = mTempAccessibilityNodeInfoList;
    infos.clear();
    try {
        if (mViewRootImpl.mView == null || mViewRootImpl.mAttachInfo == null) {
            return;
        }
        mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = flags;
        View root = null;
        if (accessibilityViewId != AccessibilityNodeInfo.ROOT_ITEM_ID) {
            root = findViewByAccessibilityId(accessibilityViewId);
        } else {
            root = mViewRootImpl.mView;
        }
        if (root != null) {
            final int resolvedViewId = root.getContext().getResources()
                    .getIdentifier(viewId, null, null);
            if (resolvedViewId <= 0) {
                return;
            }
            if (mAddNodeInfosForViewId == null) {
                mAddNodeInfosForViewId = new AddNodeInfosForViewId();
            }
            mAddNodeInfosForViewId.init(resolvedViewId, infos);
            root.findViewByPredicate(mAddNodeInfosForViewId);
            mAddNodeInfosForViewId.reset();
        }
    } finally {
        updateInfosForViewportAndReturnFindNodeResult(
                infos, callback, interactionId, spec, interactiveRegion);
    }
}
 

private void findAccessibilityNodeInfosByTextUiThread(Message message) {
    final int flags = message.arg1;

    SomeArgs args = (SomeArgs) message.obj;
    final String text = (String) args.arg1;
    final IAccessibilityInteractionConnectionCallback callback =
        (IAccessibilityInteractionConnectionCallback) args.arg2;
    final MagnificationSpec spec = (MagnificationSpec) args.arg3;
    final int accessibilityViewId = args.argi1;
    final int virtualDescendantId = args.argi2;
    final int interactionId = args.argi3;
    final Region interactiveRegion = (Region) args.arg4;
    args.recycle();

    List<AccessibilityNodeInfo> infos = null;
    try {
        if (mViewRootImpl.mView == null || mViewRootImpl.mAttachInfo == null) {
            return;
        }
        mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = flags;
        View root = null;
        if (accessibilityViewId != AccessibilityNodeInfo.ROOT_ITEM_ID) {
            root = findViewByAccessibilityId(accessibilityViewId);
        } else {
            root = mViewRootImpl.mView;
        }
        if (root != null && isShown(root)) {
            AccessibilityNodeProvider provider = root.getAccessibilityNodeProvider();
            if (provider != null) {
                infos = provider.findAccessibilityNodeInfosByText(text,
                        virtualDescendantId);
            } else if (virtualDescendantId == AccessibilityNodeProvider.HOST_VIEW_ID) {
                ArrayList<View> foundViews = mTempArrayList;
                foundViews.clear();
                root.findViewsWithText(foundViews, text, View.FIND_VIEWS_WITH_TEXT
                        | View.FIND_VIEWS_WITH_CONTENT_DESCRIPTION
                        | View.FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS);
                if (!foundViews.isEmpty()) {
                    infos = mTempAccessibilityNodeInfoList;
                    infos.clear();
                    final int viewCount = foundViews.size();
                    for (int i = 0; i < viewCount; i++) {
                        View foundView = foundViews.get(i);
                        if (isShown(foundView)) {
                            provider = foundView.getAccessibilityNodeProvider();
                            if (provider != null) {
                                List<AccessibilityNodeInfo> infosFromProvider =
                                    provider.findAccessibilityNodeInfosByText(text,
                                            AccessibilityNodeProvider.HOST_VIEW_ID);
                                if (infosFromProvider != null) {
                                    infos.addAll(infosFromProvider);
                                }
                            } else  {
                                infos.add(foundView.createAccessibilityNodeInfo());
                            }
                        }
                    }
                }
            }
        }
    } finally {
        updateInfosForViewportAndReturnFindNodeResult(
                infos, callback, interactionId, spec, interactiveRegion);
    }
}
 

private void performAccessibilityActionUiThread(Message message) {
    final int flags = message.arg1;
    final int accessibilityViewId = message.arg2;

    SomeArgs args = (SomeArgs) message.obj;
    final int virtualDescendantId = args.argi1;
    final int action = args.argi2;
    final int interactionId = args.argi3;
    final IAccessibilityInteractionConnectionCallback callback =
        (IAccessibilityInteractionConnectionCallback) args.arg1;
    Bundle arguments = (Bundle) args.arg2;

    args.recycle();

    boolean succeeded = false;
    try {
        if (mViewRootImpl.mView == null || mViewRootImpl.mAttachInfo == null ||
                mViewRootImpl.mStopped || mViewRootImpl.mPausedForTransition) {
            return;
        }
        mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = flags;
        View target = null;
        if (accessibilityViewId != AccessibilityNodeInfo.ROOT_ITEM_ID) {
            target = findViewByAccessibilityId(accessibilityViewId);
        } else {
            target = mViewRootImpl.mView;
        }
        if (target != null && isShown(target)) {
            if (action == R.id.accessibilityActionClickOnClickableSpan) {
                // Handle this hidden action separately
                succeeded = handleClickableSpanActionUiThread(
                        target, virtualDescendantId, arguments);
            } else {
                AccessibilityNodeProvider provider = target.getAccessibilityNodeProvider();
                if (provider != null) {
                    succeeded = provider.performAction(virtualDescendantId, action,
                            arguments);
                } else if (virtualDescendantId == AccessibilityNodeProvider.HOST_VIEW_ID) {
                    succeeded = target.performAccessibilityAction(action, arguments);
                }
            }
        }
    } finally {
        try {
            mViewRootImpl.mAttachInfo.mAccessibilityFetchFlags = 0;
            callback.setPerformAccessibilityActionResult(succeeded, interactionId);
        } catch (RemoteException re) {
            /* ignore - the other side will time out */
        }
    }
}