android怎么实现多点触摸应用

android怎么实现多点触摸应用

本篇内容介绍了“android怎么实现多点触摸应用”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！

JhkMultiTouchActivity.java

packagecom.android.forlinx;importandroid.app.Activity;importandroid.os.Bundle;importandroid.view.Window;importandroid.view.WindowManager;publicclassJhkMultiTouchActivityextendsActivity{/**Calledwhentheactivityisfirstcreated.*/@OverridepublicvoidonCreate(BundlesavedInstanceState){super.onCreate(savedInstanceState);//setContentView(R.layout.main);//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MTViewsetContentView(newMTView(this));}}

MTView.java

packagecom.android.forlinx;importandroid.content.Context;importandroid.graphics.Canvas;importandroid.graphics.Color;importandroid.graphics.Paint;importandroid.graphics.Typeface;importandroid.view.MotionEvent;importandroid.view.SurfaceHolder;importandroid.view.SurfaceView;publicclassMTViewextendsSurfaceViewimplementsSurfaceHolder.Callback{privatestaticfinalintMAX_TOUCHPOINTS=10;privatestaticfinalStringSTART_TEXT="请随便触摸屏幕进行测试";privatePainttextPaint=newPaint();privatePainttouchPaints[]=newPaint[MAX_TOUCHPOINTS];privateintcolors[]=newint[MAX_TOUCHPOINTS];privateintwidth,height;privatefloatscale=1.0f;publicMTView(Contextcontext){super(context);SurfaceHolderholder=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();}privatevoidinit(){//初始化10个不同颜色的画笔textPaint.setColor(Color.GREEN);textPaint.setTypeface(null);textPaint.setAlpha(200);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(inti=0;iMAX_TOUCHPOINTS){pointerCount=MAX_TOUCHPOINTS;}//锁定Canvas,开始进行相应的界面处理Canvasc=getHolder().lockCanvas();if(c!=null){c.drawColor(Color.BLACK);if(event.getAction()==MotionEvent.ACTION_UP){//当手离开屏幕时，清屏}else{//先在屏幕上画一个十字，然后画一个圆for(inti=0;iheight){this.scale=width/480f;}else{this.scale=height/480f;}textPaint.setTextSize(14*scale);Canvasc=getHolder().lockCanvas();if(c!=null){//背景黑色c.drawColor(Color.BLACK);floattWidth=textPaint.measureText(START_TEXT);c.drawText(START_TEXT,width/2-tWidth/2,height/2,textPaint);getHolder().unlockCanvasAndPost(c);}}publicvoidsurfaceCreated(SurfaceHolderholder){}publicvoidsurfaceDestroyed(SurfaceHolderholder){}}

效果图

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