测试手机多点触摸

最新推荐文章于 2022-04-27 13:55:31 发布

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这篇博客通过代码演示了如何测试手机的多点触摸功能，详细介绍了相关实现过程。

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1.代码演示:

package com.example.my_android_pointstouch;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Administrator on 2017/7/9.
 */

public class MyView extends View {
    List<Circle> circles=new ArrayList<>();
    public MyView(Context context) {
        super(context);
    }

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

    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    public MyView(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        Paint paint=new Paint();
        for (Circle circle : circles) {
            circle.drawSelf(canvas,paint);
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //获取手指的行为
        int action=event.getAction();
        int action_code=action&0xff;
        //手指的下标index
        int pointIndex=action>>8;
        //获取手指的坐标
        float x=event.getX(pointIndex);
        float y=event.getY(pointIndex);
        //获取手指的名字id
        int pointId=event.getPointerId(pointIndex);

        if (action_code>=5){
            action_code-=5;
        }

        switch (action_code){
            case MotionEvent.ACTION_DOWN:
                //实例化圆
                Circle c=new Circle(x,y,pointId);
                //将圆添加到集合中
                circles.add(c);
                break;
            case MotionEvent.ACTION_UP:
                circles.remove(get(pointId));
                break;
            case MotionEvent.ACTION_MOVE:
                for (int i = 0; i < event.getPointerCount(); i++) {
                    int id=event.getPointerId(i);
                    get(id).x=event.getX(i);
                    get(id).y=event.getY(i);
                }
                break;
        }
        //重新调用onDraw 重绘
        invalidate();
        return true;

    }

    //圆的下标
    public  Circle get(int pointId){
        for (Circle circle : circles) {
            if (circle.pointId==pointId){
                return  circle;
            }
        }
        return null;
    }

}

(2)圆
package com.example.my_android_pointstouch;

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

import java.util.Random;

/**
 * Created by Administrator on 2017/7/9.
 */

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);
        blue=random.nextInt(255);
    }

    public  void drawSelf(Canvas canvas, Paint paint){
        paint.setColor(Color.rgb(red,green,blue));
        canvas.drawCircle(x,y,r,paint);
    }

}

(3)MainActivity
package com.example.my_android_pointstouch;

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

import java.util.Random;

/**
 * Created by Administrator on 2017/7/9.
 */

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);
        blue=random.nextInt(255);
    }

    public  void drawSelf(Canvas canvas, Paint paint){
        paint.setColor(Color.rgb(red,green,blue));
        canvas.drawCircle(x,y,r,paint);
    }

}