android – SimpleOnGestureListener永远不会进入onFling(…)方法

你好SimpleOnGestureListener不能在我的应用程序中工作这就是我实现它的方式.也许你可以发现什么是错的.事情是调试显示应用程序永远不会进入onFling(…)方法和gdt.onTouchEvent(事件);总是返回false：/
有任何想法吗？？谢谢

我的活动课

public class SimpleActivity extends Activity{


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.simpleLayout);

    final ImageView imageView = (ImageView) findViewById(R.id.gggbbb);
     imageView.setonTouchListener(new OnFlingGestureListener() {

        @Override
        public void onTopToBottom() {
           System.out.println("top");
        }

        @Override
        public void onRightToLeft() {
            System.out.println("right");
        }

        @Override
        public void onLeftToRight() {
            System.out.println("left");
        }

        @Override
        public void onBottomToTop() {
            System.out.println("bottom");
        }
     });



}


    }

我的抽象听众

package com.dmd.client.detailsMenus;

 import android.view.GestureDetector;
 import android.view.GestureDetector.SimpleOnGestureListener;
 import android.view.MotionEvent;
 import android.view.View;
 import android.view.View.OnTouchListener;

 public abstract class OnFlingGestureListener implements OnTouchListener {

  private final GestureDetector gdt = new GestureDetector(new GestureListener());

  @Override
  public boolean onTouch(final View v,final MotionEvent event) {
     return gdt.onTouchEvent(event);
  }

  private final class GestureListener extends SimpleOnGestureListener {

     private static final int SWIPE_MIN_disTANCE = 60;
     private static final int SWIPE_THRESHOLD_VELociTY = 100;

     @Override
     public boolean onFling(MotionEvent e1,MotionEvent e2,float veLocityX,float veLocityY) {
         if(e1.getX() - e2.getX() > SWIPE_MIN_disTANCE && Math.abs(veLocityX) > SWIPE_THRESHOLD_VELociTY) {
             onRightToLeft();
             return true;
          } else if (e2.getX() - e1.getX() > SWIPE_MIN_disTANCE && Math.abs(veLocityX) > SWIPE_THRESHOLD_VELociTY) {
             onLeftToRight();
             return true;
          }
          if(e1.getY() - e2.getY() > SWIPE_MIN_disTANCE && Math.abs(veLocityY) > SWIPE_THRESHOLD_VELociTY) {
             onBottomToTop();
             return true;
          } else if (e2.getY() - e1.getY() > SWIPE_MIN_disTANCE && Math.abs(veLocityY) > SWIPE_THRESHOLD_VELociTY) {
             onTopToBottom();
             return true;
          }
          return false;
     }
  }

  public abstract void onRightToLeft();

  public abstract void onLeftToRight();

  public abstract void onBottomToTop();

  public abstract void onTopToBottom();

}

@Override
public boolean onTouch(final View v,final MotionEvent event) {
  gdt.onTouchEvent(event);
  return true;
}