How to ensure PeriodicWorkRequests are called on device reboot on Android N and upwards

问题

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:

Guarantees task execution, even if the app or device restarts

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

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

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.

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!

Here's how I implemented my PeriodicWorkRequest

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

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

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

回答1:

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 {
...............................
}

In that case defined this worker inside manifest

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

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.

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);
}
}
}

来源：https://stackoverflow.com/questions/55305619/how-to-ensure-periodicworkrequests-are-called-on-device-reboot-on-android-n-and

标签

android

broadcastreceiver

android-workmanager