片段上的手势检测

Question

我有Activity一个单独的Fragment:

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

我的问题是,我如何检测手势？我试过OnTouchListener,也用onInterceptTouchEvent方法.基本上我想检测滑动.我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;
    }
}

然后我在我的注册Activity:

    @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.我怎样才能实现这一目标？请不要建议使用ViewPager,我不能使用它.

Answer 1

这是我针对这个问题制定的解决方法。

我必须重写dispatchTouchEvent()我的Activity. 当窗口发生触摸事件时，将调用此函数。

@Override
public boolean dispatchTouchEvent(MotionEvent ev) {
    boolean handled = swipeDetector.onTouchEvent(ev);
    if (!handled) {
        return super.dispatchTouchEvent(ev);
    }

    return handled;
}