@Override
  public void onStop() {

    if (image_loaded) {

      float z = img.getCurrentZoom();
      PointF poi = img.getScrollPosition();
      float x = poi.x;
      float y = poi.y;

      MyApplication.editor.putFloat("NWSRADMOS_ZOOM", z);
      MyApplication.editor.putFloat("NWSRADMOS_X", x);
      MyApplication.editor.putFloat("NWSRADMOS_Y", y);
      MyApplication.editor.apply();
    }

    super.onStop();
  }