HeaderScrollHelper isRecyclerViewTop

[tom0gao]

private 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 || (firstVisibleItemPosition == 0 && childAt.getTop() == 0)) {
return true;
}
}
}
return false;
}
这个方法中 置灰的地方 如果rv中加了间距 这里会判断不准确，是否可以提供 设置间距的api 在这里减去对应的值