问 Android OpenGL ES:每秒限制帧数

EN

我有一个问题，我的框架限制器的工作非常不精确。我将目标帧设置为每秒30，但得到的值介于10 and和500 and之间。我想我犯了一个很大的错误，但我找不到。这是应该限制FPS的类：

public class FrameLimiter {
private long interval;
private long startTime;
private long endTime;
private long timeForOneFrame;
/** Limits an unlimited loop.
 * You should select a value above 25FPS!
 * @param FPS the target value of frames per second
public FrameLimiter(int FPS){
    interval = 1000/FPS;
    startTime = System.currentTimeMillis();
/** Calling this method stops the current thread until enough time elapsed to reach the target FPS.
public void limit(){
    endTime = System.currentTimeMillis();
    timeForOneFrame = endTime - startTime;
    if (timeForOneFrame < interval)
        try {
            Thread.sleep(interval - timeForOneFrame);
        } catch (InterruptedException e) {
            e.printStackTrace();
    startTime = System.currentTimeMillis();
/** Returns the current FPS measured against the time between two calls of limit().
 * This method just works in combination with limit()!
 * @return the current FPS.
public int getFPS(){
    if(timeForOneFrame <= 0){
        return 0;
    }else{
        return (int) (1000/timeForOneFrame);
}

我用这样的方式上课：

@Override
public void onDrawFrame(GL10 gl) {            
    this.render();