recycleView 顶部

recycleView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
//newState分 0,1,2三个状态,2是滚动状态,0是停止
super.onScrollStateChanged(recyclerView, newState);
//-1代表顶部,返回true表示没到顶,还可以滑
//1代表底部,返回true表示没到底部,还可以滑
boolean b = recyclerView.canScrollVertically(1);
boolean b1 = recyclerView.canScrollVertically(-1);
}

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
    super.onScrolled(recyclerView, dx, dy);

}

});