如何在ListView中从两侧滑动？

Question

我试图在Listview中从两侧进行滑动，但现在我只能从右侧进行滑动，但我想从左右两侧进行滑动，请任何人告诉我该怎么做。

private void swipe(int dis) {
    if (dis > mMenuView.getWidth()) {
        dis = mMenuView.getWidth();
    }
    if (dis < 0) {
        dis = 0;
    }

    mContentView.layout(-dis, mContentView.getTop(), mContentView.getWidth() - dis, getMeasuredHeight());

    mMenuView.layout(mContentView.getWidth() - dis, mMenuView.getTop(),
            mContentView.getWidth() + mMenuView.getWidth() - dis,
            mMenuView.getBottom());
}

/ onSwipe功能 /

    public boolean onSwipe(MotionEvent event) {
         mGestureDetector.onTouchEvent(event);

      switch (event.getAction()) {
      case MotionEvent.ACTION_DOWN:
        mDownX = (int) event.getX();
        isFling = false;
        break;
      case MotionEvent.ACTION_MOVE:
        // Log.i("byz", "downX = " + mDownX + ", moveX = " + event.getX());
        int dis = (int) (mDownX - event.getX());
        if (state == STATE_OPEN) {
            dis += mMenuView.getWidth();
        }
        swipe(dis);
        break;
        case MotionEvent.ACTION_UP:
        if (isFling
                || (mDownX - event.getX()) > (mMenuView.getWidth() / 1.5)) {
            // open
            smoothOpenMenu();
        } else {
            // close
            smoothCloseMenu();
            return false;
        }
        break;
    }
    return true;
}

请仔细阅读上述代码，并向我提出一些解决方案。