Android服务中的计时器 [英] Timer inside Android service

问题描述

我有一个Android服务，该服务会启动一个执行以下操作的计时器:

I have an Android service that starts a timer that does stuff:

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    timer.scheduleAtFixedRate(new VeryImportantTask(), 0, RATE);
    return START_STICKY;
}

我知道服务是单例的，但是每次调用startService()时都会调用onStartCommand方法吗?如果是这样，我应该控制我的计时器是第一次启动，不是吗?我在考虑服务中的静态布尔值标志.有更好的方法吗?

I know Services are singleton but, does onStartCommand method called each time that I call startService()? If so, I should control that my timer is just started the first time, shouldn't I? I'm thinking in a static boolean flag in the service. Is there a better way?

推荐答案

在您的情况下，即 START_STICKY ，您只需检查意图值 nullity 像这样

In your case i.e START_STICKY you can simply check the intent value nullity like this

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
      if(null==intent){
              // service restarted do what you want
        }
    return START_STICKY;
}

因为初次使用意图不会为 null ，并且每次使用START_STICKY重新启动时，意图都将为 null .

because first time the intent will not be null and it will be null every time in case of a restart with START_STICKY.

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