cocos2d-x在android真机上设置帧率无效的问题

通过setAnimationInterval设置帧频时，发现在android下没有效果的

在Cocos2dxRenderer .java文件里面找到了onDrawFrame这个函数。里面有句注释：

FPS controlling algorithm is not accurate, and it will slow down FPS on some devices. So comment FPS controlling code.

这个函数里的大部分代码都被注释掉了

 1 public void onDrawFrame(final GL10 gl) {
 2 
 3 /*
 4  * FPS controlling algorithm is not accurate, and it will slow down FPS
 5  * on some devices. So comment FPS controlling code.
 6  */
 7 
 8  /*
 9  final long nowInNanoSeconds = System.nanoTime();
10  final long interval = nowInNanoSeconds - this.mLastTickInNanoSeconds; */
11 
12  // should render a frame when onDrawFrame() is called or there is a
13  // "ghost" 
14 Cocos2dxRenderer.nativeRender();
15 
16  /* 
17 // fps controlling if (interval < Cocos2dxRenderer.sAnimationInterval) { try { 
18 // because we render it before, so we should sleep twice time interval
19 Thread.sleep((Cocos2dxRenderer.sAnimationInterval - interval) /Cocos2dxRenderer.NANOSECONDSPERMICROSECOND); 
20 } catch (final Exception e) { }
21  }
22 
23 this.mLastTickInNanoSeconds = nowInNanoSeconds;
24 */
25 
26 }

经过google后暂时找到了解决方案，是否有问题需要待测试：

 1 private long renderingElapsedTime;
 2 
 3 @Override
 4 public void onDrawFrame(final GL10 gl) {
 5     /*
 6      * FPS controlling algorithm is not accurate, and it will slow down FPS
 7      * on some devices. So comment FPS controlling code.
 8      */
 9 
10     try {
11         if (renderingElapsedTime< Cocos2dxRenderer.sAnimationInterval) {
12             Thread.sleep((Cocos2dxRenderer.sAnimationInterval - renderingElapsedTime) / NANOSECONDSPERMICROSECOND);
13         }
14     } catch (InterruptedException e) {
15         e.printStackTrace();
16     }
17 
18     // Get the timestamp when rendering started
19     long renderingStartedTimestamp = System.nanoTime();
20 
21     // should render a frame when onDrawFrame() is called or there is a
22     // "ghost" 
23     Cocos2dxRenderer.nativeRender();
24 
25     // Calculate the elapsed time during rendering
26     renderingElapsedTime = (System.nanoTime() - renderingStartedTimestamp);
27 }