在后台区间调用Web服务 [英] Call web service in interval on background

问题描述

应用程序需要的时间间隔（每次30min例如）手动背景从服务器同步数据或。结果保存到本地数据库。同步完成后我想提醒活动/片段......和力的更新列表（如果需要）。有很多的活动，所以我想将它的活动之外，使其更加一致。

Application need synchronize data from server in interval (for example every 30min) or manually on background. Result is saved to local database. After sync is done I want remind activity/fragment ... and force update list (if needed). There are many activities, so I want move it outside of activity and make it more consistent.

现在我创建的AsyncTask其从服务器产生并保存到数据库中。

For now I created AsyncTask which get result from server and save to DB.

我768,16使用？ BroadcastReciever，服务，AlarmManager？

What shoud I use? BroadcastReciever, Service, AlarmManager?

更新

根据答案我开始的报警在应用程序

Based on answers I start alarm in Application

AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
Intent intent = new Intent(context, AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
manager.setInexactRepeating(AlarmManager.RTC, 0, AlarmManager.INTERVAL_HALF_HOUR, pendingIntent);

创建的接收

public class AlarmReceiver extends WakefulBroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent syncIntent = new Intent();
        syncIntent.setClass(context, DataSyncer.class);
        startWakefulService(context, syncIntent);
    }
}

创建 IntentService

public class DataSyncer extends IntentService {
        @Override
        protected void onHandleIntent(Intent intent) {
            // get data from server
            // save to DB
            AlarmReceiver.completeWakefulIntent(intent);
        }
}

和注册接收器，服务于 AndroidManifest

And registered Receiver and Service in AndroidManifest

<service
    android:name="com.cloudit.tsystems.app.DataSyncer"
    android:enabled="true">
</service>
<receiver
    android:name="com.cloudit.tsystems.app.AlarmReceiver"
    android:enabled="true">
</receiver>

在哪里，我怎么通知同步在活动完成/片段？

Where and how I notify that sync is done in Activity/Fragment?

推荐答案

我会用AlarmManager并注册一个BroadcastReceiver。一旦接收器被触发，我将推出IntentService到在后台下载的数据。

I would use the AlarmManager and register a BroadcastReceiver. Once the receiver is fired, I will launch an IntentService to download the data in the background.

配置您的报警：

    AlarmManager manager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    Intent intent = new Intent(context, MyBroadcast.class);
    PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

    manager.setInexactRepeating(AlarmManager.RTC, 0, AlarmManager.INTERVAL_HALF_HOUR, pendingIntent);

创建将得到通知一个BroadcastReceiver当警报响起。请注意，我使用的是<一个href=\"https://developer.android.com/reference/android/support/v4/content/WakefulBroadcastReceiver.html\"相对=nofollow> WakefulBroadcastReceiver 从而使设备不下去的时候，你要同步进入梦乡。

Create a BroadcastReceiver that will get notified when the alarm goes off. Note that I'm using a WakefulBroadcastReceiver so that the device doesn't go to sleep when you're syncing.

class MyBroadcast extends WakefulBroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {

        Intent syncIntent = new Intent();
        syncIntent.setClass(context, DataSyncer.class);
        startWakefulService(context, syncIntent);
    }
}

接着，IntentService将在后台中下载数据

Next, an IntentService that will download data in the background:

class DataSyncer extends IntentService{

    ...

    @Override
    protected void onHandleIntent(Intent intent) {
       //sync data
       MyBroadcast.completeWakefulIntent(intent);
    }

}

更新：
所以，现在你有你的数据同步，有几个选项来通知活动和片段。您可以使用LocalBroadcastManager播出。看看此联系了解更多详情。

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