在一个片段内未检测到android swipe

Question

我有一个基于标签主机并使用片段的项目,

在一个选项卡上它有一个listFragment,用户点击一个单元格并转到另一个片段,

从那里用户可以在该标签的片段之间滑动,

我让项目工作,直到我去listFragment的单元格,

我需要检测向左或向右滑动以相应地更改碎片,

我的代码:

public class PrepareSkin extends Fragment implements OnGestureListener{

      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 GestureDetector gestureScanner;


    @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
       Bundle savedInstanceState) {


        gestureScanner = new GestureDetector(this);


      // TODO Auto-generated method stub
      View myFragmentView = inflater.inflate(R.layout.prepare_skin, container, false);

       Log.i("Mirko", "CREATO <<");


      return myFragmentView;
     }

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

    @Override
    public boolean onDown(MotionEvent e) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,
            float velocityY) {
        try {
               if (Math.abs(e1.getY() - e2.getY()) > SWIPE_MAX_OFF_PATH)
                   return false;
               // right to left swipe
               if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                   Log.i("Mirko", "LEFTERS <<");


               }  else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
                   Log.i("Mirko", "rIGTHERS >>");

               }
               else if(e1.getY() - e2.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
               }  else if (e2.getY() - e1.getY() > SWIPE_MIN_DISTANCE && Math.abs(velocityX) > SWIPE_THRESHOLD_VELOCITY) {
               }
           } catch (Exception e) {
               // nothing
           }

                   return true;
    }

    @Override
    public void onLongPress(MotionEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
            float distanceY) {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public boolean onSingleTapUp(MotionEvent e) {
        // TODO Auto-generated method stub
        return false;
    }

}

那为什么我的手势识别器不工作？

谢谢,

Answer 1

这个链接似乎很适合你：Android Fragment onCreateView with Gestures

尽管它们没有OnGestureListener在类中实现，而是将 clickListener 附加到整个视图，然后以这种方式触发手势侦听器，但它仍然应该适用于您的代码片段。

另一个快速解决方法可能是您返回onDown()false - 也许您应该将其返回 true。我知道 Android 不会识别onUp()ifonDown()没有true提前返回。