Firebase Emulator and Physical Android Device.

I spent a lot of time getting a physical android device to work with the Firestore emulator. This repository has a working example.

The solution is to use your ip address in firebase.json

  "emulators": {
    "firestore": {
      "host":"192.168.0.199",
      "port": 8080
    },

and in your code. For me that’s Flutter and Dart

FirebaseFirestore.instance.useFirestoreEmulator("192.168.0.199", 8080);

Here is the sample test I setup.

Start the emulator

cd emulator
firebase emulators:start --export-on-exit=emulatorData --import=emulatorData

Start and android emulator

emulator -avd Nexus_5X_API_28

Run the app

cd test_app
flutter run

Run the flutter app and everything should work flawlessly. Now shut down the android emulator and connect a real android device. Restart the app.

The app wont work. I get this error

W/Firestore(30266): (24.0.1) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(30266):
W/Firestore(30266): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.

══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
The following StateError was thrown building StreamBuilder&lt;DocumentSnapshot&lt;Object?>>(dirty, state:
_StreamBuilderBaseState&lt;DocumentSnapshot&lt;Object?>, AsyncSnapshot&lt;DocumentSnapshot&lt;Object?>>>#a193b):
Bad state: cannot get a field on a DocumentSnapshotPlatform which does not exist

Now if this line is commented out the physical device runs fine.

FirebaseFirestore.instance.useFirestoreEmulator("localhost", 8080);

Any help would be appreciated.

If I use more emulator services I get similar errors. this is from another app.

An Observatory debugger and profiler on Nexus 5X is available at: http://127.0.0.1:62536/y_wW9MBDpnc=/
D/vndksupport(  851): Loading /vendor/lib64/hw/android.hardware.graphics.mapper@2.0-impl.so from current namespace instead of sphal namespace.
D/vndksupport(  851): Loading /vendor/lib64/hw/gralloc.msm8992.so from current namespace instead of sphal namespace.
E/flutter (  851): [ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception: [firebase_auth/unknown] com.google.firebase.FirebaseException: An internal error has occurred. [ Failed to connect to /10.0.2.2:9099 ]
E/flutter (  851): #0      MethodChannelFirebaseAuth.signInAnonymously (package:firebase_auth_platform_interface/src/method_channel/method_channel_firebase_auth.dart:423:7)

W/Firestore(29632): (24.0.1) [OnlineStateTracker]: Could not reach Cloud Firestore backend. Backend didn't respond within 10 seconds
W/Firestore(29632):
W/Firestore(29632): This typically indicates that your device does not have a healthy Internet connection at the moment. The client will operate in offline mode until it is able to successfully connect to the backend.

Github link

Firebase Emulator and Physical Android Device.

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