Android 检测手机多点触摸点数

多指点击屏幕，然后在点击的地方画相应的圆

首先，我们先将圆的属性写入一个实体类

代码如下：

package com.zking.administrator.g160628_android19_pointstouch;

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import java.util.Random;



public class Circle {
    public float x;
    public float y;
    public int r=100;
    public int pointId;

    int red;
    int green;
    int blue;
    Random random=new Random();

    public Circle(float x, float y, int pointId) {
        this.x = x;
        this.y = y;
        this.pointId = pointId;
        red=random.nextInt(255);
        green=random.nextInt(255);