Android Open Source - HapiPodcastJ Fling Gesture Detector

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License

The source code is released under:

GNU General Public License

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Java Source Code

package info.xuluan.podcast;
/*www. j a  v  a  2  s .  c  o  m*/
import info.xuluan.podcast.utils.Log;
import android.content.Intent;
import android.view.GestureDetector;
import android.view.GestureDetector.SimpleOnGestureListener;
import android.view.MotionEvent;
import android.view.View;

public class FlingGestureDetector extends SimpleOnGestureListener {

  private static final int SWIPE_MIN_DISTANCE = 120;
    private static final int SWIPE_MAX_OFF_PATH = 250;
  private static final int SWIPE_THRESHOLD_VELOCITY = 200;

  private Flingable flingable;

  private final Log log = Log.getLog(getClass());
  
  public FlingGestureDetector(Flingable f) {
    flingable = f;
  }
  
  @Override
  public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
    //log.debug("onFling");
    try {
      if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
        return false;  //swipe was not horizontal
      if (Math.abs(velocityX) <= SWIPE_THRESHOLD_VELOCITY)
        return false;  //too slow
      if (Math.abs(e1.getX() - e2.getX()) <= SWIPE_MIN_DISTANCE)
        return false;  //too short
      // right to left swipe
      if(e1.getX() > e2.getX()) {
        Intent nextIntent = flingable.nextIntent();
        if (nextIntent!=null) {
          // right to left swipe, move to the activity on the right
          flingable.startActivity(nextIntent);
          flingable.finish();
          return true;
        }
      } else if (e2.getX() > e1.getX()) {
        Intent prevIntent = flingable.prevIntent();
        if (prevIntent!=null) {
          // left to right swipe, move to the activity on the left
          flingable.startActivity(prevIntent);
          flingable.finish();
          return true;
        }
      }
    } catch (Exception e) {
      // nothing
    }
    return false;
  }

  @Override
  public boolean onDown(MotionEvent ev)
  {
    //We need to return true to ensure that our onFLing method gets called.
    return true;
  }
  
  public View.OnTouchListener createOnTouchListener() {
        final GestureDetector gestureDetector = new GestureDetector(this);
        View.OnTouchListener gestureListener = new View.OnTouchListener() {
            public boolean onTouch(View v, MotionEvent event) {
              log.debug("fling MotionEvent: "+event);
                if (gestureDetector.onTouchEvent(event)) {
                    return true;
                }
                return false;
            }
        };
        return gestureListener;
  }
}

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