我可以使用Firebase JobDispatcher触发特定时间的任务 [英] Can i use Firebase JobDispatcher for triggering time specific tasks

问题描述

我正在开发一个应用程序，其中某些任务要在特定时间在后台完成。

I am developing an application where certain tasks as to be done in background at a specific time.

Android开发人员文档建议了各种方法。我知道AlarmManager可用于此目的。但是，我认为，在打6.0模式下在Android 6.0中使用AlarmManager会产生不正确的触发器。

Android developer docs suggests various methods. I know AlarmManager can be used for this purpose. But, I think, using AlarmManager in Android 6.0 in Doze mode will give improper triggers.

我从开发人员文档

因为我的应用程序支持Android 5.0以下的版本。我想到要使用FireBaseJobDispatcher。

As my application supports version below Android 5.0. I thought of using FireBaseJobDispatcher.

我可以使用FirebaseJobDispatcher在特定时间触发特定任务吗。

Can I use FirebaseJobDispatcher for trigger a specific task at a specific time.

例如：我想每小时从9AM到6PM一次更新数据库

For Example : I want to update the DB once every hour from 9AM to 6PM

推荐答案

可以，但是如果您的时间范围是不是那么严格，因为打Do模式，不能保证您的任务会在几个小时后开始工作。如果您要进行严格的调度，请使用AlarmManager.setAndAllowWhileIdle。
而且，据我所知FirebaseJobDispatcher尚未发布，并且还有一些未解决的问题。为此，您可以使用GCMNetworkManager（来自Google Play服务 com.google.android.gms：play-services-gcm ）。
您的FirebaseJobDispatcher代码可能如下所示：

You can, but if you time window is not so strict, there is no guarantee that your task start to work in a few hours later, because Doze mode. If you want really strict scheduling - use AlarmManager.setAndAllowWhileIdle. And, as I know FirebaseJobDispatcher has not released yet, and there is a few unresolved issues. Before it releases, you can use GCMNetworkManager (from Google Play Services com.google.android.gms:play-services-gcm) for this purpose. Your code for FirebaseJobDispatcher may looks like this:

final FirebaseJobDispatcher dispatcher = new FirebaseJobDispatcher(new GooglePlayDriver(context));
if (isSyncEnabled) {

    Job job = dispatcher.newJobBuilder()
            .setService(SyncService.class)
            .setTag(TAG)
            .setConstraints(isSyncOnlyWiFi ? Constraint.ON_UNMETERED_NETWORK : Constraint.ON_ANY_NETWORK)
            .setRecurring(true) // !!!
            .setLifetime(Lifetime.FOREVER) //!!!
            .setTrigger(Trigger.executionWindow(syncIntervalInSeconds, syncIntervalInSeconds + TIME_WINDOW_IN_SECONDS))
            .setReplaceCurrent(true)
            .setRetryStrategy(RetryStrategy.DEFAULT_EXPONENTIAL)
            .build();

    final int result = dispatcher.schedule(job);
    if (result != FirebaseJobDispatcher.SCHEDULE_RESULT_SUCCESS) {
        // pre handle error
    }

对于GcmNetworkManager：

For GcmNetworkManager:

PeriodicTask task = new PeriodicTask.Builder()
            .setService(SyncManagerService.class)
            .setTag(TASK_TAG_SYNC_SERVICE)
            .setUpdateCurrent(true)
            .setPersisted(true)
            .setPeriod(period)
            .setFlex(flexInSeconds < period ? flexInSeconds : period)
            .setRequiredNetwork(wifiOnly ? PeriodicTask.NETWORK_STATE_UNMETERED : PeriodicTask.NETWORK_STATE_CONNECTED)
            .build();

GcmNetworkManager.getInstance(context).schedule(task);

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