[Android实例] android多点触摸demo

MultiTouchActivity Java代码

packagecom.zhaokai.multitouch;
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.view.Window;
importandroid.view.WindowManager;
publicclassMultiTouchActivityextendsActivity{
/**Calledwhentheactivityisfirstcreated.*/
/**Calledwhentheactivityisfirstcreated.*/
@Override
publicvoidonCreate(BundlesavedInstanceState){
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(newMySurfaceView(this));
}
}

SurfaceView类：

Java代码

packagecom.zhaokai.multitouch;
importandroid.content.Context;
importandroid.graphics.Canvas;
importandroid.graphics.Color;
importandroid.graphics.Paint;
importandroid.view.MotionEvent;
importandroid.view.SurfaceHolder;
importandroid.view.SurfaceHolder.Callback;
importandroid.view.SurfaceView;
publicclassMySurfaceViewextendsSurfaceViewimplementsCallback{
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;
publicMySurfaceView(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();
}
publicvoidinit(){
//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(inti=0;i<MAX_TOUCHPOINTS;i++){
touchPaints[i]=newPaint();
touchPaints[i].setColor(colors[i]);
}
}
@Override
publicbooleanonTouchEvent(MotionEventevent){
intpointerCount=event.getPointerCount();
if(pointerCount>MAX_TOUCHPOINTS){
pointerCount=MAX_TOUCHPOINTS;
}
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
c.drawColor(Color.BLACK);
}else{
//先在屏幕上画一个十字，然后画一个圆
for(inti=0;i<pointerCount;i++){
//获取一个触点的坐标，然后开始绘制
intid=event.getPointerId(i);
intx=(int)event.getX(i);
inty=(int)event.getY(i);
drawCrosshairsAndText(x,y,touchPaints[id],i,id,c);
}
for(inti=0;i<pointerCount;i++){
intid=event.getPointerId(i);
intx=(int)event.getX(i);
inty=(int)event.getY(i);
drawCircle(x,y,touchPaints[id],c);
}
}
getHolder().unlockCanvasAndPost(c);
}
returntrue;
}
privatevoiddrawCrosshairsAndText(intx,inty,Paintpaint,intptr,intid,Canvasc){
c.drawLine(0,y,width,y,paint);
c.drawLine(x,0,x,height,paint);
inttextY=(int)((15+20*ptr)*scale);
c.drawText("x"+ptr+"="+x,10*scale,textY,textPaint);
c.drawText("y"+ptr+"="+y,70*scale,textY,textPaint);
c.drawText("id"+ptr+"="+id,width-55*scale,textY,textPaint);
}
privatevoiddrawCircle(intx,inty,Paintpaint,Canvasc){
c.drawCircle(x,y,40*scale,paint);
}
@Override
publicvoidsurfaceChanged(SurfaceHolderholder,intformat,intwidth,
intheight){
this.width=width;
this.height=height;
if(width>height){
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);
}
}
@Override
publicvoidsurfaceCreated(SurfaceHolderholder){
//TODOAuto-generatedmethodstub
}
@Override
publicvoidsurfaceDestroyed(SurfaceHolderholder){
//TODOAuto-generatedmethodstub
}
}

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