android – Fragment上的手势检测

getFragmentManager().begintransaction().add(android.R.id.content,fragment1).commit();

我的问题是,我如何检测手势？我尝试使用OnTouchListener,也使用onInterceptTouchEvent方法.基本上我想检测滑动.我的SwipeGestureDetector看起来像这样：

public class SwipeGestureDetector extends SimpLeonGestureListener {

    // ...

    @Override
    public Boolean onDown(MotionEvent E) {
        return true;
    }

    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;

            if (e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE && Math.abs(veLocityX) > SWIPE_THRESHOLD_VELociTY) {
                // right to left swipe

            } else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE && Math.abs(veLocityX) > SWIPE_THRESHOLD_VELociTY) {
                // left to right swipe

            }
        } catch (Exception E) {
            // nothing
        }
        return false;
    }
}

然后我在我的活动中注册它：

@Override
    protected void onCreate(Bundle savedInstanceStatE) {
        super.onCreate(savedInstanceStatE);
        // ..

        SwipeGestureDetector swipeDetector = new SwipeGestureDetector();
        final GestureDetector detector = new GestureDetector(this,swipeDetector);
        findViewById(android.R.id.content).setOnTouchListener(new OnTouchListener() {

            @Override
            public Boolean onTouch(View v,MotionEvent event) {
                return detector.onTouchEvent(event);
            }
        });
    }

不幸的是,没有检测到滑动手势.我怎样才能做到这一点？请不要建议使用ViewPager,我不能使用它.