Android（十四）：按钮水波效果

• 安装
  

// scripts/BtnRippleView.cs
using Android.Content;
using Android.Graphics;
using Android.Util;
using Com.Andexert.Library;

namespace android_by_csharp.scripts
{
    public class BtnRippleView : RippleView
    {
        public BtnRippleView(Context context) : base(context) { }
        public BtnRippleView(Context context, IAttributeSet attrs): base(context, attrs) { } 
        public BtnRippleView(Context context, IAttributeSet attrs, int defStyle): base(context, attrs, defStyle) { }

        public override void Draw(Canvas canvas)
        {
            canvas.Save();
            base.Draw(canvas);
        }
    }
}