NestedScrollView滑动监听

        nestedScrollView.setOnScrollChangeListener(new NestedScrollView.OnScrollChangeListener() {
            @Override
            public void onScrollChange(NestedScrollView v, int scrollX, int scrollY, int oldScrollX, int oldScrollY) {

                if (scrollY > oldScrollY) {
                    Log.e("=====", "下滑");
                }
                if (scrollY < oldScrollY) {
                    Log.e("=====", "上滑");
                }

                if (scrollY == 0) {
                    Log.e("=====", "滑倒顶部");
                }

                if (scrollY == (v.getChildAt(0).getMeasuredHeight() - v.getMeasuredHeight())) {
                    Log.e("=====", "滑倒底部");
                }
            }
        });