[Android实例] android多点触摸demo
16lz
2021-12-04
阅读更多 MultiTouchActivity
SurfaceView类：
package com.zhaokai.multitouch;import android.app.Activity;import android.os.Bundle;import android.view.Window;import android.view.WindowManager;public class MultiTouchActivity extends Activity { /** Called when the activity is first created. */ /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //隐藏标题栏 requestWindowFeature(Window.FEATURE_NO_TITLE); //设置成全屏 getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN); //设置为上面的MTView setContentView(new MySurfaceView(this)); }} SurfaceView类：
package com.zhaokai.multitouch;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.view.MotionEvent;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class MySurfaceView extends SurfaceView implements Callback{private static final int MAX_TOUCHPOINTS = 10;private static final String START_TEXT = "请随便触摸屏幕进行测试"; private Paint textPaint = new Paint(); private Paint touchPaints[] = new Paint[MAX_TOUCHPOINTS]; private int colors[] = new int[MAX_TOUCHPOINTS]; private int width, height; private float scale = 1.0f;public MySurfaceView(Context context) { super(context); SurfaceHolder holder = getHolder(); holder.addCallback(this); setFocusable(true); // 确保我们的View能获得输入焦点 setFocusableInTouchMode(true); // 确保能接收到触屏事件 init(); }public void init(){ // 初始化10个不同颜色的画笔 textPaint.setColor(Color.WHITE); colors[0] = Color.BLUE; colors[1] = Color.RED; colors[2] = Color.GREEN; colors[3] = Color.YELLOW; colors[4] = Color.CYAN; colors[5] = Color.MAGENTA; colors[6] = Color.DKGRAY; colors[7] = Color.WHITE; colors[8] = Color.LTGRAY; colors[9] = Color.GRAY; for(int i=0;iMAX_TOUCHPOINTS){ pointerCount=MAX_TOUCHPOINTS; } Canvas c=getHolder().lockCanvas(); if(c!=null){ c.drawColor(Color.BLACK); if(event.getAction()==MotionEvent.ACTION_UP){ // 当手离开屏幕时，清屏 c.drawColor(Color.BLACK); }else{ // 先在屏幕上画一个十字，然后画一个圆 for(int i=0;i
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