第一个tab ，当RecyclerView linearlayout 为 StaggeredGridLayoutManager 时候， 布局不能够滚动

[huanjulu]

No description provided.

[bowen-xiao]

遇到同样的问题如何解决

[zzycami]

在ScrollableHelper的isRecyclerViewTop中添加StaggeredGridLayoutManager的时候的判断即可，项目中没有对这个类型进行判断：

private static boolean isRecyclerViewTop(RecyclerView recyclerView) {
        if (recyclerView != null) {
            RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
            if (layoutManager instanceof LinearLayoutManager) {
                int firstVisibleItemPosition = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
                View childAt = recyclerView.getChildAt(0);
                if (childAt == null) {
                    return true;
                }
                if (firstVisibleItemPosition == 0) {
                    ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) childAt.getLayoutParams();
                    int topMargin = lp.topMargin;
                    int top = childAt.getTop();
                    if (top >= topMargin) {
                        return true;
                    }
                }
            }else if (layoutManager instanceof StaggeredGridLayoutManager) {
                int[] firstVisibleItemPosition = ((StaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(null);
                int first = firstVisibleItemPosition[0];

                //说明适配器里没有数据已经是顶部了
                View childAt = recyclerView.getChildAt(0);
                if (childAt == null) {
                    return true;
                }
                //说明可见的是第一个
                if (firstVisibleItemPosition.length > 0 && first == 0) {
                    ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) childAt.getLayoutParams();
                    int topMargin = lp.topMargin;
                    int top = childAt.getTop();
                    if (top >= topMargin) {
                        return true;
                    }
                }
            }
        }
        return false;
    }