如何使用SkiaSharp在Android中添加OnTouch事件 [英] How to add OnTouch Event in android with SkiaSharp

问题描述

我有问题.我正在使用SkiaSharp制作TriangleGrid.现在，我正在绘制网格，但是现在我想触摸网格中的三角形以为其着色.为此，我需要在SKCanvasView中添加一个TouchEvent，但我不知道该怎么做.

在互联网上，我可以找到下一个示例:

I have a problem. I am using SkiaSharp to make a TriangleGrid. Now I am doing drawing the Grid, but now I want to touch a triangle in the grid to color it. To do that I need to add a TouchEvent to the SKCanvasView, but I dont know how to do that.

On the internet I can find the next example:

• https ://docs.microsoft.com/zh-CN/xamarin/xamarin-forms/user-interface/graphics/skiasharp/paths/finger-paint
• https://github.com/mattleibow/SkiaSharpDemo/blob/master/SkiaSharpDemo/SkiaSharpDemo/MainPage.xaml

• https://docs.microsoft.com/en-us/xamarin/xamarin-forms/user-interface/graphics/skiasharp/paths/finger-paint
• https://github.com/mattleibow/SkiaSharpDemo/blob/master/SkiaSharpDemo/SkiaSharpDemo/MainPage.xaml

但是我正在使用Xamarin Android，而这些示例在我的代码中不起作用.我也尝试使用:

But I am using Xamarin Android and those example doesn't work in my code. I also tried to use:

skiaView = FindViewById<SkiaSharp.Views.Android.SKCanvasView>(Resource.Id.skiaView);
skiaView.SetOnTouchListener += OnTouch;

但这给了我一个错误:由于它是一个方法组"，因此无法分配给'SetOnTouchListener'"

But that gives me the error: "Cannot assign to 'SetOnTouchListener' because it's a 'method group'"

有人可以帮我在SkiaSharp画布上获得TouchListener吗??

Can anyone help me to get a TouchListener on my SkiaSharp canvas!?

推荐答案

您使用错误的方法添加了事件，可以这样设置OnTouch事件:

You are using the wrong method to add event ,you could set OnTouch event like this:

skiaView= FindViewById<SKCanvasView>(Resource.Id.skiaView);
skiaView.Touch += onTouch;

private void onTouch(object sender, View.TouchEventArgs e)
  {
     Toast.MakeText(this, "touch", ToastLength.Short).Show();
  }

或:

public class MainActivity : AppCompatActivity,View.IOnTouchListener
  {
    private SKCanvasView skiaView;
    protected override void OnCreate(Bundle savedInstanceState)
      {
        base.OnCreate(savedInstanceState);
        SetContentView(Resource.Layout.Main);
        skiaView= FindViewById<SKCanvasView>(Resource.Id.skiaView);
        skiaView.SetOnTouchListener(this);  
        ...
      }
    public bool OnTouch(View v, MotionEvent e)
      {
        Toast.MakeText(this,"touch",ToastLength.Short).Show();
        return true;
      }
  }

这篇关于如何使用SkiaSharp在Android中添加OnTouch事件的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！