Mygesturedetector Extends Simpleongesturelistener

I am implementing a MyGestureDetector that extends a SimpleOnGestureListener. I borrowed the class from: http://www.codeshogun.com/blog/tag/view-flipper/ to allow a swipe action i

Solution 1:

I think the problem is that you don't override the OnDown event. Add this code snippet to your MyGestureDetector class, and it should be work.

@OverridepublicbooleanonDown(MotionEvent e) {
    returntrue;        
}

The onDown event return false by default, and every gesture start with onDown so your onFling event will not fire.

Istvan

Solution 2:

Seems like you can now solve this problem with a lot less code using a gesture detector, like this:

import android.content.Context;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.MotionEvent;
import android.view.View;
import android.widget.GridView;

publicclassScrollingGridViewextendsGridView {
    private GestureDetector gestureDetector;

    publicScrollingGridView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    publicScrollingGridView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        setupGestureListener();
    }

    privatevoidsetupGestureListener() {
        GestureDetector.SimpleOnGestureListenergestureListener=newGestureDetector.SimpleOnGestureListener() {
            @OverridepublicbooleanonScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
                scrollBy((int)distanceX, (int)distanceY);
                returntrue;
            }
        };
        gestureDetector = newGestureDetector(getContext(), gestureListener);
        setOnTouchListener(newOnTouchListener() {
            @OverridepublicbooleanonTouch(View view, MotionEvent motionEvent) {
                gestureDetector.onTouchEvent(motionEvent);
                returntrue;
            }
        });
    }
}