java - Android - 不准确的线程睡眠

Question

我尝试通过 android 模拟器和 jvm 运行此代码。在 JVM 上它应该休眠 33-34 毫秒，但在 android 上它是 68-85 毫秒。为什么这么不准确？

谢谢您的帮助。

package android.apps.td;

公共类逻辑实现可运行{

private long frame_time = 1000000000/30;
private long offset = 0;
private long timestamp = 0;

public void run(){
    long step;
    while(true){
        step = System.nanoTime();
        if((offset = (step - timestamp)) > frame_time){
            System.out.println("FRAME     "+(step - timestamp)/1000000+" ms");
            timestamp = step;
            update();
            render();
            repaint();
            try {
                Thread.sleep(frame_time/1000000+1);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }else{
            try {
                System.out.println("Sleep ["+((frame_time-offset)/1000000+1)+" ms]");

                Thread.sleep(((frame_time-offset)/1000000+1));
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}

private void update() {
}

private void render() {
}

private void repaint() {
}

}