Android基本游戏循环实例分析
本文实例讲述了Android基本游戏循环。分享给大家供大家参考。具体如下：
//desiredfps
privatefinalstaticintMAX_FPS=50;
//maximumnumberofframestobeskipped
privatefinalstaticintMAX_FRAME_SKIPS=5;
//theframeperiod
privatefinalstaticintFRAME_PERIOD=1000/MAX_FPS;
@Override
publicvoidrun(){
Canvascanvas;
Log.d(TAG,"Startinggameloop");
longbeginTime;//thetimewhenthecyclebegun
longtimeDiff;//thetimeittookforthecycletoexecute
intsleepTime;//mstosleep(<0ifwe'rebehind)
intframesSkipped;//numberofframesbeingskipped
sleepTime=0;
while(running){
canvas=null;
//trylockingthecanvasforexclusivepixelediting
//inthesurface
try{
canvas=this.surfaceHolder.lockCanvas();
synchronized(surfaceHolder){
beginTime=System.currentTimeMillis();
framesSkipped=0;//resettingtheframesskipped
//updategamestate
this.gamePanel.update();
//renderstatetothescreen
//drawsthecanvasonthepanel
this.gamePanel.render(canvas);
//calculatehowlongdidthecycletake
timeDiff=System.currentTimeMillis()-beginTime;
//calculatesleeptime
sleepTime=(int)(FRAME_PERIOD-timeDiff);
if(sleepTime>0){
//ifsleepTime>0we'reOK
try{
//sendthethreadtosleepforashortperiod
//veryusefulforbatterysaving
Thread.sleep(sleepTime);
}catch(InterruptedExceptione){}
}
while(sleepTime<0&&framesSkipped<MAX_FRAME_SKIPS){
//weneedtocatchup
//updatewithoutrendering
this.gamePanel.update();
//addframeperiodtocheckifinnextframe
sleepTime+=FRAME_PERIOD;
framesSkipped++;
}
}
}finally{
//incaseofanexceptionthesurfaceisnotleftin
//aninconsistentstate
if(canvas!=null){
surfaceHolder.unlockCanvasAndPost(canvas);
}
}//endfinally
}
}
希望本文所述对大家的Android程序设计有所帮助。