滑动投掷手势和android ListActivity的问题:投掷手势正在激活底层列表项

Question

我正在尝试在列表活动上实现滑动投掷手势。这是工作的，但问题是，触摸事件也激活了列表上的项目!

我已经寻找了其他的答案，但不幸的是没有找到一个工作的解决方案。下面是我使用的代码:

在列表活动中:

// Setup the swipe detector
mSwipeGestureListener = new SwipeGestureListener(this);
mGestureDetector = new GestureDetector(mSwipeGestureListener);
mGestureDetector.setIsLongpressEnabled(false);
@Override
public boolean dispatchTouchEvent(final MotionEvent ev)
{
    boolean handled = false;
    if (mGestureDetector != null)
    {
        handled = mGestureDetector.onTouchEvent(ev);
    }
    handled |= super.dispatchTouchEvent(ev);
    return handled;
}

下面是手势监听器的代码:

  public class SwipeGestureListener extends GestureDetector.SimpleOnGestureListener
  {
    protected final Activity mActivity;
    protected final int mTouchSlop;
    protected final int mMinimumSwipeVelocity;
    public SwipeGestureListener(final Activity activity)
    {
        mActivity = activity;
        final ViewConfiguration viewConfiguration = ViewConfiguration.get(activity);
        mTouchSlop = viewConfiguration.getScaledTouchSlop();
        mMinimumSwipeVelocity = viewConfiguration.getScaledMinimumFlingVelocity();
    }
    @Override
    public boolean onFling(final MotionEvent e1, final MotionEvent e2, final float velocityX, final float velocityY)
    {
        // Don't handle swipe if Y offset is greater than touch slop
        if (Math.abs(e1.getY() - e2.getY()) > mTouchSlop)
        {
            return false;
        }
        else
        {
            if (e1.getX() - e2.getX() > mTouchSlop
             && -velocityX > mMinimumSwipeVelocity)
            {
                // User swiped finger left.
                onSwipeToLeft();
            }
            else if (e2.getX() - e1.getX() > mTouchSlop
             && velocityX > mMinimumSwipeVelocity)
            {
                // User swiped finger left.
                onSwipeToRight();
            }
            // We're interested in these series of events
            return true;
        }        
    }
    // It is necessary to return true from onDown for the onFling event to register
    @Override
    public boolean onDown(final MotionEvent e)
    {
        return true;
    }
    protected void onSwipeToLeft() {}
    protected void onSwipeToRight() {};
   }

我完全被难住了。在Android中，如果手势不激活列表中的底层项目，我该如何处理手势呢?

注:使用视图。根布局上的setOnTouchListener导致从未接收到触摸事件;这就是为什么我使用dispatchTouchEvent

任何帮助都将非常感激。

谢谢!

Answer 1

这不是一个完整的解决方案，但我能够通过以下代码更改来解决问题:

不使用dispatchEvent，我这样做:

    getListView().setOnTouchListener(new View.OnTouchListener() 
    {
        @Override
        public boolean onTouch(final View v, final MotionEvent me)
        {
            boolean handled = false;
            if (mGestureDetector != null)
            {
                handled = mGestureDetector.onTouchEvent(me);
            }
            return handled;
        }
    });

我改进了投掷手势如下:

    @Override
    public boolean onFling(final MotionEvent e1, final MotionEvent e2, final float velocityX, final float velocityY)
    {        
        if (e1 != null && e2 != null)
        {
            final float length = Math.abs(e1.getX() - e2.getX());
            final float height = Math.abs(e1.getY() - e2.getY());
            // Accept criteria: X movement more than or equal to touch slop, total
            // slope <= 50%
            if (length < mTouchSlop || height / length > 0.50)
            {
                return false;
            }
            else
            {
                if (-velocityX > mMinimumSwipeVelocity)
                {
                    // User swiped finger left.
                    onSwipeToLeft();
                }
                else if (velocityX > mMinimumSwipeVelocity)
                {
                    // User swiped finger right.
                    onSwipeToRight();
                }
                // We're interested in these series of events
                return true;
            }
        }
        else
        {
            return false;
        }
    }

我删除了onDown()重写，它返回true因为它搞砸了ListView上的滚动