Android Open Source - MakeitRain Game Thread

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Back to project page MakeitRain.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.finlay.makeitrain;
/*w w  w  .ja v a2 s . c o m*/
import android.graphics.Canvas;
import android.util.Log;
import android.view.SurfaceHolder;

public class GameThread extends Thread {
  private static final String TAG = "GameThread";
  
  private static final int  MAX_FPS = 50;
  private static final int   FRAME_PERIOD = 20;
  private static final int   MAX_FRAME_SKIPS = 1000 / MAX_FPS;
  
  private SurfaceHolder _surfaceHolder;
  private DollaSurface _panel;
  private boolean _run = false;
  
  
  public GameThread(SurfaceHolder surfaceHolder, DollaSurface panel) {
    _surfaceHolder = surfaceHolder;
    _panel = panel;    
  }
  
  public void setRunning(boolean run) {
    _run = run;
  }
  
  @Override
  public void run() {
    Log.v(TAG, "Starting game loop");
    

    long beginTime;
    long timeDiff;
    int sleepTime;
    int framesSkipped;

    Canvas c = null;
    while (_run) {
      c = null;
      try {
        c = _surfaceHolder.lockCanvas();
        synchronized (_surfaceHolder) {
          // reset values
          beginTime = System.currentTimeMillis();
          framesSkipped = 0;

          // update game state
          _panel.update();

          // render game state
          _panel.render(c);
          
          // how long did cycle take?
          timeDiff = System.currentTimeMillis() - beginTime;
          
          // calculate sleep time
          sleepTime = (int)(FRAME_PERIOD - timeDiff);
          
          if (sleepTime > 0) {
            try {
              Thread.sleep(sleepTime);
            } catch (InterruptedException e) {}
          }
          
          while (sleepTime < 0 && framesSkipped < MAX_FRAME_SKIPS) {
            // we need to catch up update without rendering
            _panel.update();
            
            sleepTime += FRAME_PERIOD;
            framesSkipped++;
          }
        }
      } catch (Exception e) { Log.e(TAG, "Error: " + e.getMessage());
      } finally {
        if (c != null) {
          _surfaceHolder.unlockCanvasAndPost(c);
        }
      }

    }
  }

}

Java Source Code List

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