android 2.3：如何將fps降低到60（vsync）

Question

如果我在android 4.x.x下運行我的程序（Canvas，SurfaceView），我得到穩定的60 FPS，但在2.3.3下FPS增加到75-80。 如何使在android 2.3.3下更容易60 FPS（vsync）？

更新（一些繪圖代碼）：

public class game extends Activity implements OnTouchListener 
{  
    FastRenderView renderView; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 

     super.onCreate(savedInstanceState); 

     renderView = new FastRenderView(this); 
     renderView.setOnTouchListener(this);    
     setContentView(renderView);    
    }  

    protected void onResume() { 
     super.onResume(); 
     renderView.resume(); 
    } 

    protected void onPause() { 
     super.onPause();   
     renderView.pause(); 
    }  

    class FastRenderView extends SurfaceView implements Runnable { 
     Thread renderThread = null; 
     SurfaceHolder holder; 
     volatile boolean running = false; 

     public FastRenderView(Context context) { 
      super(context); 


      holder = getHolder();  

     private void drawSurface(Canvas canvas) 
     { 
     // Draw all                  
     } 

     public void resume() {   
      running = true; 
      renderThread = new Thread(this); 
      renderThread.start();   
     } 

     public void pause() {   
      running = false;       
      while(true) { 
       try { 
        renderThread.join(); 
        break; 
       } catch (InterruptedException e) { 
        // retry 
       } 
      } 
      renderThread = null;   
     } 

     public void run() { 
      while(running) { 
       if(!holder.getSurface().isValid()) 
        continue; 

       Canvas canvas = holder.lockCanvas();    
       drawSurface(canvas);           
       holder.unlockCanvasAndPost(canvas);    
      } 
     }    

    } 

UPDATE2： 找到簡單的解決方案（感謝谷歌）：

int max_fps = 60; 
int frame_period = 1000/max_fps; 
long beginTime; 
long timeDiff; 
int sleepTime; 

public void run() { 
    sleepTime = 0; 
    while(running) { 
    if(!holder.getSurface().isValid()) 
    continue; 
    beginTime = System.currentTimeMillis();     
    Canvas canvas = holder.lockCanvas();    
    drawSurface(canvas);           
    holder.unlockCanvasAndPost(canvas); 
    timeDiff = System.currentTimeMillis() - beginTime;       
    sleepTime = (int)(frame_period - timeDiff); // calculate sleep time 
    if (sleepTime > 0) { 
    try { Thread.sleep(sleepTime); } catch (InterruptedException e) {} 
    } 
} 

Answer 1

垂直同步與果凍豆版本（項目黃油）推出。在較舊的Android版本上沒有辦法做到這一點。如果你想看完整的故事，請看這個視頻：http://www.youtube.com/watch?v=Q8m9sHdyXnE。這是值得的手錶！