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Detect if ScrollView scrolls up or down - Android

I have one ScrollView

with one LinearLayout

with TextView

s. I want to detect when it ScrollView

scrolls up or down to hide / show ActionBar

.

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3 answers


you need to create a class that extends ScrollView 

public class ExampleScrollView extends ScrollView


and then an override onScrollChanged

which gives you the old and new scroll positions and from there you can determine which direction

protected void onScrollChanged(int l, int t, int oldl, int oldt)
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check it



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

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

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

    return false;
  }
});
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Correct short answer

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


                int x = scrollY - oldScrollY;
                if (x > 0) {
                    //scroll up
                } else if (x < 0) {
                    //scroll down
                } else {

                }

    }
});
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