android的多点触摸效果

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1.获取点击xy轴的下标，实现触摸效果。

        获取XY画一个圆并且自动从下变大，直到消失不见。

效果图如下：
这里写图片描述
代码如下：
1.写一个实体类，用于存写触摸点击的XY轴下表，并根据获得的下标用半径把圆画出来，半径默认为0

package com.example.android_pointstouch;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.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;import java.util.Random;/** * Created by Administrator on 2017/7/9 0009. */public class Circle {    public  float x;    public  float y;    public  int r;    public int pointId;    private int red;    private int green;    private int blue;    Random random=new Random();    public  Circle(float x,float y,int r,int pointId){        this.x=x;        this.y=y;        this.r=r;        this.pointId=pointId;        this.red=random.nextInt(255);        this.green=random.nextInt(255);        this.blue=random.nextInt(255);    }    //画圆    public void drawSelf(Canvas canvas, Paint paint){        paint.setColor(Color.rgb(red,green,blue));//颜色        canvas.drawCircle(x,y,r,paint);        paint.setStyle(Paint.Style.STROKE);    }}

2.利用线程的调用改变圆半径的大小

package com.example.android_pointstouch;import android.content.Context;import android.content.Intent;import android.graphics.Canvas;import android.graphics.Paint;import android.os.Handler;import android.os.Message;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Created by Administrator on 2017/7/9 0009. */public class MyButton extends View {        private List<Circle> circleList=new ArrayList<>();    private float x;    private float y;    private int indexid;    int i=0;    public MyButton(Context context) {        super(context);    }    public MyButton(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public MyButton(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    public MyButton(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {        super(context, attrs, defStyleAttr, defStyleRes);    }    //画画    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        Paint paint=new Paint();        paint.setStyle(Paint.Style.STROKE);        for (Circle circle : circleList) {            circle.r+=10;            circle.drawSelf(canvas,paint);        }    }    //触摸    @Override    public boolean onTouchEvent(MotionEvent event) {        int action = event.getAction();        //手指的下标Index        int pointIndex = action >> 8;        int action_code= action&0xff;        x = event.getX(pointIndex);//X轴        y = event.getY(pointIndex);//Y轴        indexid = event.getPointerId(pointIndex);//触摸的下标       // Log.i("text","pointIndex="+pointIndex+"action_code="+action_code+"indexid="+indexid);        if(action_code>=5){            action_code-=5;        }        switch (action_code){            case MotionEvent.ACTION_DOWN://点击                i++;                Circle circle=new Circle(x,y,0,indexid);//进来一次就NEW一个对象                circleList.add(circle);//加入集合                new my().start();//启动线程                break;            case MotionEvent.ACTION_UP://移开                //circleList.remove(delete(indexid));                break;            case MotionEvent.ACTION_MOVE://移动               /* for (int i = 0; i <event.getPointerCount() ; i++) {                   int id= event.getPointerId(i);                    delete(id).x=event.getX(i);                    delete(id).y=event.getY(i);                }*/                break;        }        invalidate();        return true;    }    //移除    public Circle delete(int indexid){        for (Circle circle : circleList) {            if(circle.pointId==indexid){                return circle;            }        }        return null;    }    //线程 改变圆大小    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    class my extends Thread{        @Override        public void run() {            for (int i = 0; i <10; i++) {                try {                    sleep(110);                    postInvalidate();//回调                } catch (InterruptedException e) {                    e.printStackTrace();                }                if(i==9){                    circleList.remove(0);                }            }        }    }}

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