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This article shows you how to open service in Android 8.0, the content is concise and easy to understand, absolutely can make you shine, through the detailed introduction of this article I hope you can gain something.

reason

Android 8.0 has a complication; background apps are not allowed to create background services. As a result, Android 8.0 introduces a completely new method, Context.startForegroundService(), to launch new services in the foreground. After the system creates a service, the app has 5 seconds to call the service's startForeground() method to display a user-visible notification of the new service. If the app does not call startForeground() within this time limit, the system stops servicing and declares the app ANR.

the problems encountered

But now calling: context.startForegroundService(intent) says ANR, startForegroundService() documentation says to call startForeground() after service starts.

android.app.RemoteServiceException: Context.startForegroundService() did not then call Service.startForeground()

Complete solution steps:

1. add permissions

2. Start the server(start the server within 5 seconds of reference startup)if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {

context.startForegroundService(new Intent(context, MyService.class));

} else {

context.startService(new Intent(context, MyService.class));

}

Then you must call startForeground() in Myservice:

3. startForeground()public static final String CHANNEL_ID_STRING = "service_01" is called in onCreate method in Server;

private Notification notification;

@Override

public void onCreate() {

super.onCreate();

//Adapt 8.0 service

NotificationManager notificationManager = (NotificationManager) MyApp.getInstance().getSystemService(Context.NOTIFICATION_SERVICE);

NotificationChannel mChannel = null;

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {

mChannel = new NotificationChannel(CHANNEL_ID_STRING, getString(R.string.app_name),

NotificationManager.IMPORTANCE_LOW);

notificationManager.createNotificationChannel(mChannel);

notification = new Notification.Builder(getApplicationContext(), CHANNEL_ID_STRING).build();

startForeground(1, notification);

}

}

4. Call startForeground()@Override again in onStart

public void onStart(Intent intent, int startId) {

super.onStart(intent, startId);

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {

startForeground(1, notification);

}

}

Note:

Android 8.0 system does not allow background applications to create background services, so you can only use Context.startForegroundService() to start services

After creating a service, the app must call the service's startForeground() within 5 seconds to display a visible notification stating that a service is pending, or the system will stop the service + ANR package from being delivered.

Notification needs to add Channel, system requirements

Why call startForeground() again in onStart? A: This is mainly for services kept alive in the background. If the keepalive mechanism startForegroundService starts service A once during the running of service A, then the onCreate method of service A will not be called, only the onStart method will be called. If you don't put a notification in the onStart method, the system will think you used startForegroundService but didn't notify you within 5 seconds, and stupidly stop the service + ANR package.

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