Question

I am trying to detect gesture events on the emulator by making mouse clicks, should this work? I’ve tried double clicking (which i would expect to produce a onDoubleTap), clicking (which I would expect to produce a onSingleTapConfirmed), and dragging (to hopeful produce a onScroll), but these all produce the same three series of events: onDown, onShowPress, onLongPress.

Is there a particular way mouse clicks/drags must be made to produce gesture events on the emulator? Or is there something wrong with the below code, which I am using to detect events:

public class GestureEnabledImageView extends ImageView implements OnGestureListener, OnDoubleTapListener
{
    private GestureDetector gestureScanner;

    public GestureEnabledImageView(Context context)
    {
        super(context);
        gestureScanner = new GestureDetector(this);
        gestureScanner.setOnDoubleTapListener(this);
    }

    public GestureEnabledImageView(Context context, AttributeSet atts)
    {
        super(context, atts);
        gestureScanner = new GestureDetector(this);
        gestureScanner.setOnDoubleTapListener(this);
    }

    public GestureEnabledImageView(Context context, AttributeSet atts, int style)
    {
        super(context, atts, style);
        gestureScanner = new GestureDetector(this);
        gestureScanner.setOnDoubleTapListener(this);
    }

    @Override
    public boolean onTouchEvent(MotionEvent me)
    {
        return gestureScanner.onTouchEvent(me);
    }

    @Override
    public boolean onDown(MotionEvent e)
    {
        log("onDown: " + e.getRawX() + ", " +e.getRawY());
        return false;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
        log("onFling: " + e1.getX() + ", " + e1.getY() + " -- " + e2.getX() + ", " + e2.getY() + " -- " + velocityX + " -- " + velocityY);
        return false;
    }

    @Override
    public void onLongPress(MotionEvent e)
    {
        log("onLongPress: " + e.getRawX() + ", " +e.getRawY());
    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
    {
        log("onScroll: " + e1.getX() + ", " + e1.getY() + " -- " + e2.getX() + ", " + e2.getY() + " -- " + distanceX + " -- " + distanceY);
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e)
    {
        // TODO Auto-generated method stub
        log("onShowPress: " + e.getRawX() + ", " +e.getRawY());
        System.out.println();

    }

    @Override
    public boolean onSingleTapUp(MotionEvent e)
    {
        log("onSingleTapUp: " + e.getRawX() + ", " +e.getRawY());
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean onDoubleTap(MotionEvent e)
    {
        log("onDoubleTap: " + e.getRawX() + ", " +e.getRawY());
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean onDoubleTapEvent(MotionEvent e)
    {
        log("onDoubleTapEvent: " + e.getRawX() + ", " +e.getRawY());
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean onSingleTapConfirmed(MotionEvent e)
    {
        log("onSingleTapConfirmed: " + e.getRawX() + ", " +e.getRawY());
        // TODO Auto-generated method stub
        return false;
    }

    private void log(String text)
    {
        Log.i("MyInfo", text);
    }
}

Answer 1

Ok, found the solution, just wanted to post here for anyone else with similar problems:

The gestureListener methods should return “true”, not “false”. This is surprising, because the documentation states that returning “true” indicates that the event has been consumed, which, I would think, would keep further MotionEvents from being fired. But, apparently not…