Question

我创建了一个非常简单的ImageView，我正在尝试实现OnTouchEvent（）。这个应用程序是在Xamarin中开发的，所以它在C＃中。

当我将CustomImageView添加到布局时，看起来我的OnTouchEvent没有正常启动。

如何更改我的代码以注册OnTouchEvents？

旁注：我想开发一些允许用户缩放/旋转/移动创建的图像视图的内容，因此如果我偏离轨道，请告诉我应该做的事情。

CustomImageView

    public class CustomImageView : ImageView
{
    private float _viewX;


    public CustomImageView (Context context) :
        base(context)
    {
        Initialize ();
    }

    public CustomImageView (Context context, IAttributeSet attrs) :
        base (context, attrs)
    {
        Initialize ();
    }

    public CustomImageView (Context context, IAttributeSet attrs, int defStyle) :
        base (context, attrs, defStyle)
    {
        Initialize ();
    }

    void Initialize ()
    {
    }

    public bool OnTouchEvent(MotionEvent m_event){



        switch (m_event.Action) {

        case MotionEventActions.Down:
            _viewX = m_event.GetX ();
            System.Console.WriteLine ("Down");
            break;

        case MotionEventActions.Up:
            System.Console.WriteLine ("Up");
            break;

        case MotionEventActions.Move:
            //int x_cord = (int)m_event.GetX;
        //  int y_cord = (int)m_event.GetY;
            System.Console.WriteLine ("Move");
            break;

        }
        return true;
    }
}

以下是创建CustomImageView并将其添加到当前布局的按钮

            btnAddImage2.Click += (sender, e) => 
        { 
            CustomImageView bitmapView = new CustomImageView (this);
            Bitmap bitmap = BitmapFactory.DecodeResource(Resources, Resource.Drawable.PixagramLogo);
            bitmapView.SetImageBitmap(bitmap);
            m_Layout.AddView (bitmapView);

        };

固定/解决

看来我需要覆盖该方法。似乎解决了我当前的问题。

        public override bool OnTouchEvent(MotionEvent m_event){



        switch (m_event.Action) {

        case MotionEventActions.Down:
            _viewX = m_event.GetX ();
            System.Console.WriteLine ("Down");
            break;

        case MotionEventActions.Up:
            System.Console.WriteLine ("Up");
            break;

        case MotionEventActions.Move:
            //int x_cord = (int)m_event.GetX;
        //  int y_cord = (int)m_event.GetY;
            System.Console.WriteLine ("Move");
            break;

        }
        return true;
    }

Answer 1

    public override bool OnTouchEvent(MotionEvent m_event){



    switch (m_event.Action) {

    case MotionEventActions.Down:
        _viewX = m_event.GetX ();
        System.Console.WriteLine ("Down");
        break;

    case MotionEventActions.Up:
        System.Console.WriteLine ("Up");
        break;

    case MotionEventActions.Move:
        //int x_cord = (int)m_event.GetX;
    //  int y_cord = (int)m_event.GetY;
        System.Console.WriteLine ("Move");
        break;

    }
    return true;
}

自定义ImageView无法识别OnTouchEvent

1 个答案: