代码：

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by hwk on 2020/5/18.
 */
public class MyView extends View {
    private Paint paintPoint;//圆心
    private Paint paintWave;//波浪
    private float x, y;//画圆中心点坐标
    private int radiusPoint;//圆心直径
    private int radiusWave;//波浪直径

    private int alphaWave;//波浪透明度常量

    public MyView(Context context) {
        super(context);
        initPaint();
    }

    public MyView(Context context, AttributeSet attrs) {
        super(context, attrs);
        initPaint();
    }

    private void initPaint() {
        paintPoint = new Paint();
        paintPoint.setStyle(Paint.Style.FILL);
        paintPoint.setColor(Color.parseColor("#FF0000"));
        paintPoint.setAntiAlias(true);
        paintPoint.setStrokeWidth(radiusPoint / 2);

        paintWave = new Paint();
        paintWave.setStyle(Paint.Style.FILL);
        paintWave.setColor(Color.parseColor("#BBCFFC"));
        paintWave.setAntiAlias(true);
        paintWave.setStrokeWidth(radiusWave / 2);
        paintWave.setAlpha(alphaWave);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                radiusPoint = 30;
                radiusWave = 30;
                alphaWave = 255;
                //获取点击的坐标位置
                x = event.getX();
                y = event.getY();
                flushPaint();
                break;
        }
        return super.onTouchEvent(event);
    }

    @SuppressLint("HandlerLeak")
    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            flushPaint();
        }
    };

    private void flushPaint() {
        radiusPoint = radiusPoint - 2;
        radiusWave = radiusWave + 3;
        alphaWave = alphaWave - 20;
        if (alphaWave <= 25) {
            alphaWave = 0;
            radiusPoint = 30;
            paintWave.setStrokeWidth(radiusWave / 2);
            paintWave.setAlpha(alphaWave);
            paintPoint.setStrokeWidth(radiusPoint / 2);
            paintPoint.setAlpha(0);

            invalidate();
        } else {
            paintWave.setStrokeWidth(radiusWave / 2);
            paintWave.setAlpha(alphaWave);
            paintPoint.setStrokeWidth(radiusPoint / 2);
            paintPoint.setAlpha(255);

            invalidate();
            handler.sendEmptyMessageDelayed(0, 35);
        }
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawCircle(x, y, radiusWave, paintWave);
        canvas.drawCircle(x, y, radiusPoint, paintPoint);
    }
}