Question

我能够在列表视图上执行滑动。我想从L - ＆gt;滑动时显示一种颜色。 R和从R上滑动时的不同颜色 - > L.任何人都可以帮助我如何实现这一目标。目前我使用下面的代码来识别手势。

public class GestureListener : Java.Lang.Object, GestureDetector.IOnGestureListener
{
    public delegate void SwipeLeftEventHandler(MotionEvent first, MotionEvent second);
    public event SwipeLeftEventHandler SwipeLeftEvent;

    public delegate void SwipeRightEvetnHandler(MotionEvent first, MotionEvent second);
    public event SwipeRightEvetnHandler SwipeRightEvent;

    //public event Action LeftEvent;
    //public event Action RightEvent;
    private static int SWIPE_MAX_OFF_PATH = 300;
    private static int SWIPE_MIN_DISTANCE = 100;
    private static int SWIPE_THRESHOLD_VELOCITY = 10;

    public GestureListener()
    {
    }

    public bool OnFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
    {
        try
        {
            if (Math.Abs(e1.GetY() - e2.GetY()) > SWIPE_MAX_OFF_PATH)
                return false;
            // right to left swipe
            if (e1.GetX() - e2.GetX() > SWIPE_MIN_DISTANCE && Math.Abs(velocityX) > SWIPE_THRESHOLD_VELOCITY && SwipeLeftEvent /*LeftEvent*/ != null)
                SwipeLeftEvent(e1, e2); //LeftEvent(); //Toast.MakeText(view.Context, "Left Swipe", ToastLength.Short).Show();
            else if (e2.GetX() - e1.GetX() > SWIPE_MIN_DISTANCE && Math.Abs(velocityX) > SWIPE_THRESHOLD_VELOCITY && SwipeRightEvent /*RightEvent*/ != null)
                SwipeRightEvent(e1, e2); //RightEvent(); // Toast.MakeText(view.Context, "Right Swipe", ToastLength.Short).Show();
        }
        catch (Exception e)
        {
            // nothing
        }
        return false;
    }

    public bool OnDown(MotionEvent e)
    {
        return true;
    }
    public void OnLongPress(MotionEvent e)
    {
    }
    public bool OnScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
    {
        return true;
    }
    public void OnShowPress(MotionEvent e)
    {
    }
    public bool OnSingleTapUp(MotionEvent e)
    {
        return true;
    }
}

Answer 1

您应该可以通过this.setBackgroundColor(YOURCOLORHERE)更改背景颜色，其中this是检测到的行。这是一个similar question，请告诉我这是否解决了您的问题。

滑动时更改颜色

1 个答案: