如何安排的机器人服务以固定速率执行 [英] How to schedule an android service to execute at a fixed rate

问题描述

我的工作应该下载从网络上每X秒，以检查是否有任何变化的文件的应用程序，我用一个服务要做到这一点，但它的执行是不固定的延时率，这里是我的code代表服务：

I am working on an application that should download a file from the network every X seconds to check for any change, I use a service to do that, but its execution is not fixed with the delay time rate, here is my code for the service:

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Toast.makeText(this, "service starting", Toast.LENGTH_SHORT).show();
    checkUpdate();
    return START_STICKY;
}

private Void checkUpdate() {
    timer.scheduleAtFixedRate(new TimerTask() {
            public void run() {
                Log.i("Service", String.valueOf(++counter));
                if(Helper.isNetworkAvailable(getBaseContext())) {
                      // download file
                } else {
                        Log.e("ServiceHandler", "Couldn't get any data from the url");
                    }
                }else {
                    Log.e("Connection", "No connection");
                }
            }
        }, 10000, 10000);
    return null;
}

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的输出是不固定的，它应该每10秒运行，同时运行的服务运行以随机方式

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The output isn't fixed, it is supposed to run every 10 seconds, while running the service run in a random manner

推荐答案

如何在IntentService内设立AlarmManager？更精确。

How about setting up an AlarmManager within an IntentService? Much more accurate.

 Intent intent = new Intent(context, YourClass.class);
 PendingIntent pi = PendingIntent.getService(context, 0, intent, 0);
 AlarmManager am = (AlarmManager) c.getSystemService(Context.ALARM_SERVICE);
 am.setRepeating(AlarmManager.RTC, System.currentTimeMillis(), 10*1000, pi);

在YourClass.class（这是一个IntentService）确保，把你的逻辑在handleIntent（意向意图），这将是每10秒的的PendingIntent由AlarmManager发送调用。

Make sure within YourClass.class (which is an IntentService), put your logic in the handleIntent(Intent intent), which will be called every 10 seconds by the PendingIntent sent by the AlarmManager.

P.S。更新清单

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