Question

我正在xamarin工作室创建一个应用程序，我对listview有疑问。默认ListView工作正常，List是可滚动的，我可以上去下去。

我创造了动画 - 我将手指向左移动 - 天变为昨天并向右移动，白天变为明天。当我制作这个动画时，我的listview不可滚动;我有这个代码：

public bool OnTouch(View v, MotionEvent e)
        {

            switch (e.Action)
            {
            case MotionEventActions.Down:
                _lastX = 0;
                _lastY = 0;
                _viewX = (int)e.GetX ();
                _viewY = (int)e.GetY ();
                break;
            case MotionEventActions.Up:
                if (Math.Abs (_lastX) > 100) {
                    if (_lastX > 0) {
                        date = date.AddDays (-1);
                        DayList.Adapter = new HourInDayAdapter (this, hours, date);
                    } else {
                        date = date.AddDays (1);
                        DayList.Adapter = new HourInDayAdapter (this, hours, date);
                    }
                } else {
                    Toast.MakeText (this, "text", ToastLength.Short).Show ();
                }
                break;
            case MotionEventActions.Move:
                var left = (int)(e.RawX - _viewX);
                var down = (int)(e.RawY - _viewY);
                _lastY = down;
                _lastX = left;
                break;
            }

            return true;
        }

这是C＃我想，我应该为MotionEventActions.Move添加一些方法，但我不知道哪种方法; s

Answer 1

没有人知道解决方案？

我做到了：

case MotionEventActions.Move:


                var left = (int)(e.RawX - _viewX);
                var down2 = (int)(_lastY - e.GetY ());
                DayList.SmoothScrollBy (down2, 0);
                _lastY = (int)e.GetY();
                _lastX = left;
                break;
            }

Answer 2

实际上我建议您在GestureDetector内使用OnTouch，这样您就可以告诉＆＃34;当物品被向左或向右滑动时。 GestureDetector是一个允许您识别某些动作模式的类。您可以继承其中一个标准检测器，例如GestureDetector.SimpleOnGestureListener

即

gestureDetector = new GestureDetector(context, YourGestureDetector);

public override bool OnTouch(View v, MotionEvent e)
{
   if (gestureDetector.OnTouchEvent(e) && e.Action != MotionEventActions.Down)
   {
      //you have detected the gesture you were looking for
      //Do something about it
      return true; //because you want to notify that you handled the event so it won't propogare further (optional, depending on what behavior you want)   
   }
   return base.OnTouch(v, e);
}

以下是探测器实现的示例：

class YourGestureDetector : GestureDetector.SimpleOnGestureListener
    {
        //always return true in OnDown
        public override bool OnDown(MotionEvent e)
        {
            return true;
        }

        public override bool OnScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
        {
           //detects scrolling motion. return true so it will be picked up by your detector
        }

        public override bool OnFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
        {
           //detects "swiping" motion. return true so it will be picked up by your detector
        }

    }

在OnTouch方法中滚动ListView

2 个答案: