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

public void onDrawFrame(final GL10 gl) {

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

 /*
 final long nowInNanoSeconds = System.nanoTime();
 final long interval = nowInNanoSeconds - this.mLastTickInNanoSeconds; */

 // should render a frame when onDrawFrame() is called or there is a
 // "ghost" 
Cocos2dxRenderer.nativeRender();

 /* 
// fps controlling if (interval < Cocos2dxRenderer.sAnimationInterval) { try { 
// because we render it before, so we should sleep twice time interval
Thread.sleep((Cocos2dxRenderer.sAnimationInterval - interval) /Cocos2dxRenderer.NANOSECONDSPERMICROSECOND); 
} catch (final Exception e) { }
 }

this.mLastTickInNanoSeconds = nowInNanoSeconds;
*/

}

经过google后暂时找到了解决方案，是否有问题需要待测试：

private long renderingElapsedTime;

@Override
public void onDrawFrame(final GL10 gl) {
    /*
     * FPS controlling algorithm is not accurate, and it will slow down FPS
     * on some devices. So comment FPS controlling code.
     */

    try {
        if (renderingElapsedTime< Cocos2dxRenderer.sAnimationInterval) {
            Thread.sleep((Cocos2dxRenderer.sAnimationInterval - renderingElapsedTime) / NANOSECONDSPERMICROSECOND);
        }
    } catch (InterruptedException e) {
        e.printStackTrace();
    }

    // Get the timestamp when rendering started
    long renderingStartedTimestamp = System.nanoTime();

    // should render a frame when onDrawFrame() is called or there is a
    // "ghost" 
    Cocos2dxRenderer.nativeRender();

    // Calculate the elapsed time during rendering
    renderingElapsedTime = (System.nanoTime() - renderingStartedTimestamp);
}