每分钟运行一次的服务 [英] Service that runs every minute

问题描述

我有一项服务，我想在后台每分钟执行一次任务.它不需要在手机休眠时执行任务，只有在用户积极使用它时才需要执行任务.我正在尝试使用如下设置的 IntentService 来执行此操作:

I have a service that I am wanting to execute a task every minute in the background. It does not need to execute the task whenever the phone is asleep, only when the user is actively using it. I am trying to do this with an IntentService which is set up as follows:

public class CounterService extends IntentService{

    public CounterService() {
        super("CounterService");
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
       return super.onStartCommand(intent,flags,startId);
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        Toast.makeText(this, "onhandleintent", Toast.LENGTH_SHORT).show();
        while(true)
        {
            //one minute is 60*1000
            try {
                Thread.sleep(5 * 1000);
                Toast.makeText(getApplicationContext(), "getting app count", Toast.LENGTH_LONG).show();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

现在为了使功能正常工作，我只是希望它每 5 秒显示一次祝酒词，我会将其更改为一分钟后.如果我将 while(true) 注释掉，则会显示onhandleintent"消息.但是，如果我运行以下代码，则 Toasts 都不会显示.我该如何解决这个问题?

Right now to get the functionality working I simply want it to display a toast every 5 seconds, I will change it to one minute later. If I have the while(true) commented out, then the "onhandleintent" message is displayed. However if I have the following code run, neither of the Toasts display. How can I fix this?

推荐答案

这将每分钟向您的服务发送一个意图，而不会在您的活动中使用任何处理器时间

This will send an intent to your service every minute without using any processor time in your activity in between

  Intent myIntent = new Intent(context, MyServiceReceiver.class);
  PendingIntent pendingIntent = PendingIntent.getBroadcast(context,  0, myIntent, 0);

  AlarmManager alarmManager = (AlarmManager)context.getSystemService(Context.ALARM_SERVICE);
  Calendar calendar = Calendar.getInstance();
  calendar.setTimeInMillis(System.currentTimeMillis());
  calendar.add(Calendar.SECOND, 60); // first time
  long frequency= 60 * 1000; // in ms 
  alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), frequency, pendingIntent);           

调整 MyServiceReceiver.class 以匹配您的目标服务或活动.文档 提供了更多详细信息来微调您的调用，例如您是否需要准确的时间，在一天中的特定时间执行...

Adjust MyServiceReceiver.class to match your target service or activity. The documentation provides more details to fine-tune your calls like whether you want exact timing, execution at a specific time of the day ...

这篇关于每分钟运行一次的服务的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！