how to detect the position of the scroll nestedscrollview android at the bottom?

Question

i just want to detect the position of the scroll nestedscrollview android at the bottom, and the to call function. my code is :

scroll.getViewTreeObserver()
         


        

Answer 1

for api <23 you can add a treeObserver.scrollChangeLister store a local float variable and check which way your scrolling like this

example

public class About extends AppCompatActivity implements 
ViewTreeObserver.OnScrollChangedListener{

private float viewScrolled = 0;

   nestedScrollView.getViewTreeObserver().addOnScrollChangedListener(this);

}

@Override
public void onScrollChanged() {

    if (viewScrolled < nestedScrollView.getScrollY()){
        viewScrolled = nestedScrollView.getScrollY();
        Log.d(TAG, "scrolling up");
    }
    if (viewScrolled > nestedScrollView.getScrollY()){
        viewScrolled = nestedScrollView.getScrollY();
        Log.d(TAG, "scrolling down");
    }
}