【简释】RecyclerView——OnScrollListener

mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
    
    
            /**
             * 滚动时回调
             * @param recyclerView RecyclerView
             * @param newState 状态
             * 0:SCROLL_STATE_IDLE:      结束，不处于滚动状态(The RecyclerView is not currently scrolling)
             * 1:SCROLL_STATE_DRAGGING:  手动滑动，被手动拖拽中(The RecyclerView is currently being dragged by outside input such as user touch input)
             * 2:SCROLL_STATE_SETTLING:  自动滑动，撒手后的自动滚动或者代码设置的自动滚动(The RecyclerView is currently animating to a final position while not under outside control)
             * 例：
             * 无反应：手指垂直放置垂直拿开（单击/长按）；手指进行左右方向的滑动；等未产生上下滑动的操作
             * 1,2,0：滑动后手指非垂直拿起，离屏时产生惯性滑动
             * 1,0：滑动后手指静止垂直拿起，未在离屏时产生惯性滑动
             */
            @Override
            public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {
    
    
                super.onScrollStateChanged(recyclerView, newState);
            }

            /**
             * 列表在滑动过程中不断调用（注意事列表滑动不是手指滑动，比如列表已经到底部了还在继续下滑，是不会触发的）
             * @param recyclerView RecyclerView
             * @param dx 水平方向距上一次dx偏移量
             * @param dy 垂直方向距上一次dy偏移量
             */
            @Override
            public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {
    
    
                super.onScrolled(recyclerView, dx, dy);
            }
        });