Android基本游戏循环实例分析_Android

Android基本游戏循环实例分析

2021-04-02 16:56红薯 Android

这篇文章主要介绍了Android基本游戏循环,以完整实例形式较为详细的分析了Android实现基本游戏循环的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下

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：

									// desired fps

									private final static int  MAX_FPS = 50;

									// maximum number of frames to be skipped

									private final static int  MAX_FRAME_SKIPS = 5;

									// the frame period

									private final static int  FRAME_PERIOD = 1000 / MAX_FPS; 

									@Override

									public void run() {

									  Canvas canvas;

									  Log.d(TAG, "Starting game loop");

									  long beginTime;   // the time when the cycle begun

									  long timeDiff;   // the time it took for the cycle to execute

									  int sleepTime;   // ms to sleep (<0 if we're behind)

									  int framesSkipped; // number of frames being skipped 

									  sleepTime = 0;

									  while (running) {

									    canvas = null;

									    // try locking the canvas for exclusive pixel editing

									    // in the surface

									    try {

									      canvas = this.surfaceHolder.lockCanvas();

									      synchronized (surfaceHolder) {

									        beginTime = System.currentTimeMillis();

									        framesSkipped = 0; // resetting the frames skipped

									        // update game state

									        this.gamePanel.update();

									        // render state to the screen

									        // draws the canvas on the panel

									        this.gamePanel.render(canvas);

									        // calculate how long did the cycle take

									        timeDiff = System.currentTimeMillis() - beginTime;

									        // calculate sleep time

									        sleepTime = (int)(FRAME_PERIOD - timeDiff);

									        if (sleepTime > 0) {

									          // if sleepTime > 0 we're OK

									          try {

									            // send the thread to sleep for a short period

									            // very useful for battery saving

									            Thread.sleep(sleepTime);

									          } catch (InterruptedException e) {}

									        }

									        while (sleepTime < 0 && framesSkipped < MAX_FRAME_SKIPS) {

									          // we need to catch up

									          // update without rendering

									          this.gamePanel.update();

									          // add frame period to check if in next frame

									          sleepTime += FRAME_PERIOD;

									          framesSkipped++;

									        }

									      }

									    } finally {

									      // in case of an exception the surface is not left in

									      // an inconsistent state

									      if (canvas != null) {

									        surfaceHolder.unlockCanvasAndPost(canvas);

									      }

									    }  // end finally

									  }

									}