Get scrolling direction in a scrollview?

Question

This should be pretty straightforward but it seems that I missed something --- how do you figure out the direction (left/right/up/down) of a scrolling event for a ScrollView

Answer 1

Research is telling me that there is no scroll listener for that case.
You could try your approch.
Another thing I would try is to override onScrollChanged (which provides the scroll position before) and so creating your own ScrollView

Update:
This one workes for me. It scrolls to the right but not to the left.

public class CustomScrollView extends HorizontalScrollView {

    public CustomScrollView(Context context) {
        super(context);
    }

    public CustomScrollView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public CustomScrollView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public void onScrollChanged(int w, int h, int ow, int oh) {
        if (w < ow) {
            scrollTo(ow, h);
        }
    }
}

Answer 2

use this

  scrollView.setOnTouchListener(new View.OnTouchListener() {
  float y1 = 0;
  float y0 = 0;

  @Override
  public boolean onTouch(View view, MotionEvent motionEvent) {

    if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) {
      y0 = motionEvent.getY();
      Log.i("Y", motionEvent.getAction() + " + " + (y0 - y1));
    } else if (motionEvent.getAction() == MotionEvent.ACTION_MOVE) {
      y1 = motionEvent.getY();
      if (y0 - y1 > 0) {
        Log.i("Y", motionEvent.getAction() + " + " + (y0 - y1));
      } else if (y0 - y1 < 0) {
        Log.e("Y", motionEvent.getAction() + " - " + (y0 - y1));
      }
    }

    return false;
  }
});