android.support.v4.view.NestedScrollingChild#android.support.v4.view.ScrollingView源码实例Demo

private View findScrollableViewInternal(View content, boolean selfable) {
    View scrollableView = null;
    Queue<View> views = new LinkedBlockingQueue<>(Collections.singletonList(content));
    while (!views.isEmpty() && scrollableView == null) {
        View view = views.poll();
        if (view != null) {
            if ((selfable || view != content) && (view instanceof AbsListView
                    || view instanceof ScrollView
                    || view instanceof ScrollingView
                    || view instanceof NestedScrollingChild
                    || view instanceof NestedScrollingParent
                    || view instanceof WebView
                    || view instanceof ViewPager)) {
                scrollableView = view;
            } else if (view instanceof ViewGroup) {
                ViewGroup group = (ViewGroup) view;
                for (int j = 0; j < group.getChildCount(); j++) {
                    views.add(group.getChildAt(j));
                }
            }
        }
    }
    return scrollableView;
}
 

/**
 * Find out the scrollable child view from a ViewGroup.
 */
private void findScrollView(ViewGroup viewGroup) {
    scrollChild = viewGroup;
    if (viewGroup.getChildCount() > 0) {
        int count = viewGroup.getChildCount();
        View child;
        for (int i = 0; i < count; i++) {
            child = viewGroup.getChildAt(i);
            if (child instanceof ScrollingView ||
                child instanceof AbsListView ||
                child instanceof ScrollView ||
                child instanceof ViewPager ||
                child instanceof WebView) {
                scrollChild = child;
                return;
            }
        }
    }
}
 

/**
 * is video controllerView in 'list' controllerView
 *
 * @return
 */
public boolean inListView() {
    for (ViewParent vp = getParent(); vp != null; vp = vp.getParent()) {
        if (vp instanceof AbsListView || vp instanceof ScrollingView || vp instanceof ScrollView) {
            return true;
        }
    }
    return false;
}