rvTinTuc.addOnScrollListener(new RecyclerView.OnScrollListener() {

@Override

public void onScrollStateChanged(@NonNull RecyclerView recyclerView, int newState) {

if (newState == RecyclerView.SCROLL_STATE_IDLE){ // No scroll

new Handler().postDelayed(new Runnable() {

@Override

public void run() {

btnSrollToTop.setVisibility(View.GONE);

}

}, 2000);

}

}

@Override

public void onScrolled(@NonNull RecyclerView recyclerView, int dx, int dy) {

if (dy > 0){ // scroll dowm

new Handler().postDelayed(new Runnable() {

@Override

public void run() {

btnSrollToTop.setVisibility(View.GONE);

}

}, 2000);

} else if (dy < 0){ // scroll up

btnSrollToTop.setVisibility(View.VISIBLE);

}

}

});