Flutter-geolocator: java.lang.NullPointerException saat mendapatkan lokasi di isolat terpisah

Laporan Bug

Saya mendapatkan kesalahan saat mencoba mendapatkan lokasi di proses latar belakang sehingga plugin berjalan di isolasi terpisah menggunakan workmanager :

Failed to handle method call
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference

Berikut adalah beberapa jejak tumpukan:

E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234): Failed to handle method call
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234): java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Context.getPackageName()' on a null object reference
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.google.android.gms.common.GooglePlayServicesUtilLight.isGooglePlayServicesAvailable(Unknown Source:12)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.google.android.gms.common.GoogleApiAvailabilityLight.isGooglePlayServicesAvailable(Unknown Source:5)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.google.android.gms.common.GoogleApiAvailability.isGooglePlayServicesAvailable(Unknown Source:94)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.google.android.gms.common.GoogleApiAvailabilityLight.isGooglePlayServicesAvailable(Unknown Source:3)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.google.android.gms.common.GoogleApiAvailability.isGooglePlayServicesAvailable(Unknown Source:93)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.baseflow.googleapiavailability.GoogleApiAvailabilityPlugin.onMethodCall(GoogleApiAvailabilityPlugin.java:105)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:231)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at io.flutter.embedding.engine.dart.DartMessenger.handleMessageFromDart(DartMessenger.java:93)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at io.flutter.embedding.engine.FlutterJNI.handlePlatformMessage(FlutterJNI.java:642)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at android.os.MessageQueue.nativePollOnce(Native Method)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at android.os.MessageQueue.next(MessageQueue.java:336)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at android.os.Looper.loop(Looper.java:174)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at android.app.ActivityThread.main(ActivityThread.java:7356)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at java.lang.reflect.Method.invoke(Native Method)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
E/MethodChannel#flutter.baseflow.com/google_api_availability/methods( 5234):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)

Langkah-langkah reproduksi

Saya telah membuat aplikasi sampel untuk mereproduksi masalah: https://github.com/estevez-dev/sample_flutter_app
Itu sudah dikonfigurasikan untuk dijalankan di Gitpod. Cukup ketuk tombol mengambang untuk memulai tugas latar belakang dan Anda akan mendapatkan pengecualian pada getCurrentPosition .
Harap dicatat bahwa aplikasi tidak akan meminta izin lokasi, Anda harus mengizinkannya secara manual dari pengaturan Android.

Konfigurasi

Versi plugin: 5.3.0

Peron:

• [ ] :iphone: iOS
• [x] :robot: Android