Android 9 (Pie) Only: Context.startForegroundService() did not then call Service.startForeground() - Works fine on Oreo

问题

We adjusted our ongoing notification for Oreo and it worked great. Now, on Pie only (not happening on Oreo devices), we're getting the titled error. Has something changed in foreground services in Pie that I'm missing?

Here's the onCreate code for the foreground service ->

override fun onCreate() {
    super.onCreate()

    val notification: Notification = NotificationCompat.Builder(this, packageName)
            .setSmallIcon(R.drawable.status_notification_icon)
            .setContentTitle(getString(R.string.ongoing_notify_temp_title))
            .setContentText(getString(R.string.ongoing_notify_temp_message))
            .setGroup(AppConstants.NOTIFICATION_GROUP_ONGOING)
            .setColor(ContextCompat.getColor(this, R.color.custom_blue))
            .build()

    startForeground(ONGOING_NOTIFY_ID, notification)

    appSettings = AppSettings(this)

    weatherLookUpHelper = WeatherLookUpHelper()
    MyRoomDatabase.getInstance().invalidationTracker.addObserver(onChange)

    retrieveCurrentLocation()
    createAlarmManager()
}

as you can see, we're just creating the notification and then calling startForeground. Any ideas on why this code would generate the titled error?

Side Note: Fabric Crashlytics shows this crash only happening on Pixel devices (pixel, pixel xl, pixel 2, pixel 2 xl) running Pie

EDIT: We do have the foreground permission in our manifest

<uses-permission android:name="android.permission.FOREGROUND_SERVICE" />

回答1:

As mentioned here Background Service Limitations, the app/service has five seconds to call startForeground(), If the app does not call startForeground() within the time limit, the system stops the service and declares the app to be ANR.

There are some possibilities:

Either your foreground service gets destroyed/finished before calling the startForeground() method.
Or if the foreground service is already instantiated and its getting called again, then the onCreate method will not be called, instead onStartCommand will be called. Then move your logic to onStartCommand to call startForeground() method.
Your notification id in startForeground must not be 0, otherwise it will also cause the crash.

回答2:

Has something changed in foreground services in Pie that I'm missing?

YES Have a look here migration notes of Android 9 / Pie

Change

Foreground service permission

Summary

Apps wanting to use foreground services must now request the FOREGROUND_SERVICE permission first. This is a normal permission, so the system automatically grants it to the requesting app. Starting a foreground service without the permission throws a SecurityException.

UPDATE

related issue in Google Issue Tracker Context.startForegroundService() did not then call Service.startForeground

回答3:

I stopped to get the error after implementing below code in ONCREATE

Intent intent1 = new Intent(this, YourActivity.class);
          try {
                startService(intent1);
            }catch ( Exception e1){
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    this.startForegroundService(intent1);
                }else {
                    Crashlytics.log("crash for first time, trying another.");
                    this.startService(intent1);
                }
            }

For me sounds strange but is working fine without crash.

来源：https://stackoverflow.com/questions/53014866/android-9-pie-only-context-startforegroundservice-did-not-then-call-service

标签

android

android-9.0-pie