如何确保在Android N及更高版本上重启设备时调用PeriodicWorkRequests

问题描述：

我最近尝试使用 WorkManager 的 PeriodicWorkRequest s作为确保定期获取用户位置更新的可靠方法在后台。该库满足了我的要求，这个特殊的细节引起了我的注意：

I recently tried to use the WorkManager's PeriodicWorkRequests as a surefire way of getting user location updates periodically in the background. The library met my requirements and this particular detail got my attention:

即使应用程序或设备重新启动，也可以保证任务执行

Guarantees task execution, even if the app or device restarts

已经实施并测试了它，我尝试重新启动设备，并注意到Log消息和App Notification从未显示。

Having implemented and tested it, I tried rebooting my device and noticed the Log message and App Notification never showed up.

自然地，我做了一些研究并偶然发现：在Android Oreo中重新启动设备后，PeriodicWorkRequest不起作用

Naturally, I did some research and stumbled upon this: PeriodicWorkRequest not working after device reboot in android oreo

所以我尝试使用 BOOT_COMPLETED 广播接收器，以在设备重新启动时触发WorkRequest，但它不起作用。我在SO上检查了许多 BOOT_COMPLETED 接收者的问题，但没有任何作用，除了这里：在Android中重启设备后，广播接收器无法正常工作，但这涉及使用户选择您的应用作为 AccessibilityService ，这在我看来是UX的障碍。

So I tried using the BOOT_COMPLETED broadcast receiver to trigger the WorkRequest on device reboot but it didn't work. I checked numerous BOOT_COMPLETED receivers questions on SO but none worked, other than this here: Broadcast Receiver Not Working After Device Reboot in Android but that involved making the user select your app as an AccessibilityService which is a hinderance to the UX in my opinion.

经过研究后，我发现WorkManager在幕后使用了BOOT_COMPLETED BroadcastReceiver。到目前为止，我已经在Android Nougat和Oreo设备上进行了测试，因此我在运行API 16的Samsung以及运行API 22的HTC上测试了BroadcastReceiver。Receiver正常工作，我删除了它们，并在重新启动时测试了WorkRequests。他们也一样！

After some research I found out that the WorkManager uses the BOOT_COMPLETED BroadcastReceiver under the hood. I have been testing on Android Nougat and Oreo devices so far, so I tested the BroadcastReceiver on a Samsung running API 16, and also on an HTC running API 22. The Receiver worked and I removed them and also tested the WorkRequests on reboot; they worked too!

这是我实现 PeriodicWorkRequest

PeriodicWorkRequest request =
                new PeriodicWorkRequest.Builder(LocationListenerWorker.class,
                        12, HOURS)
                        .build();

        mWorkManager.enqueueUniquePeriodicWork(Constants.LOCATION_TASK_ID,
                ExistingPeriodicWorkPolicy.REPLACE, request);

我们将非常感谢您提供任何有关如何确保在运行API 24的设备上重启请求时也能调用请求的帮助+

Would appreciate any help on how to ensure the Requests also get called on device reboot on devices running API 24+

答

假设您定义了一个RebootWorker类，该类扩展了Worker并在设备重新启动后执行某些特定的工作。第一种方法：

Let Say you have defined a RebootWorker class that extends Worker and do some particular job after device get rebooted. 1st Approach :

public class RebootWorker extends Worker {
...............................
}

在那种情况下，在清单

<service
    android:name=".RebootWorker"
    android:process=":worker"/>

这将帮助Workmanger在设备重启后运行您的辅助服务。由于设备重启，您的应用已从任务管理器中清除。

This will help to get Workmanger run your worker service after device reboot. Because due to device reboot your app is cleared from task manager.

第二种方法：您还可以使用BroadcastReceiver监听启动完成的操作

2nd Approach : You can also use BroadcastReceiver to listen Boot completed action

public class MyReceiver extends BroadcastReceiver {
    WorkManager mWorkManager;
    PeriodicWorkRequest rebootRequest;

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.i(MainActivity.TAG, "intent.getAction(): "+intent.getAction());

        //Reboot worker
        mWorkManager = WorkManager.getInstance(context);
        rebootRequest = new PeriodicWorkRequest.Builder(RebootWorker.class,
                MainActivity.REPEAT_INTERVAL, MainActivity.TIME).build();

        if ("android.intent.action.BOOT_COMPLETED".equals(intent.getAction())) {
           //do your work and enqueue it 
            mWorkManager.enqueue(rebootRequest);
}
}
}

如何确保在Android N及更高版本上重启设备时调用PeriodicWorkRequests

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