@Override
 public void onStop() {
   super.onPause();
   english_popular.stopFlipping();
   english_rated.stopFlipping();
   english_recent.stopFlipping();
 }
 /*
  * (non-Javadoc)
  * @see android.app.Activity#onPause()
  */
 @Override
 protected void onPause() {
   super.onPause();
   mViewFlipper.stopFlipping();
   mGraphTimeSpeed.clearData();
   mGraphDistanceSpeed.clearData();
   mGraphTimeAltitude.clearData();
   mGraphDistanceAltitude.clearData();
   ContentResolver resolver = this.getContentResolver();
   resolver.unregisterContentObserver(this.mTrackObserver);
 }
 @Override
 public void onBackPressed() {
   viewFlipper.stopFlipping();
   super.onBackPressed();
 }