问做FPS淋浴？

EN

//To Measure FPS
private long now;
private int framesCount = 0;
private int framesCountAvg=0; 
private long framesTimer=0;

//Main Game Loop
    while (isRunning)
    {
        //Record the time before update and draw
        long beforeTime = System.nanoTime();
        //... Update program & draw program...
        // DRAW FPS: 
        now=System.currentTimeMillis(); 
        gEngine.drawFPS(c, framesCountAvg);
        framesCount++; 
        if(now-framesTimer>1000)
        { 
              framesTimer=now; 
              framesCountAvg=framesCount; 
              framesCount=0; 
        }}

public class FrameRateCounter {

    private Map<Long, Long> measurementTimes;


    public FrameRateCounter() {
        measurementTimes = new HashMap<Long, Long>();
    }

    public synchronized void submitReading() {
        long measurementTime = System.nanoTime();
        long invalidationTime = System.nanoTime() + 1000000000;
        measurementTimes.put(measurementTime, invalidationTime);
    }

    public int getFrameRate() {
        performInvalidations();
        return measurementTimes.size();
    }

    private synchronized void performInvalidations() {
        long currentTime = System.nanoTime();
        Iterator<Long> i = measurementTimes.keySet().iterator();
        while(i.hasNext()) {
            long measurementTime = i.next();
            long invalidationTime = measurementTimes.get(measurementTime);
            if(invalidationTime < currentTime) {
                i.remove();
            }
        }
    }
}