MissingPluginException(No implementation found for method init on channel plugins.flutter.io/google_sign_in)

[vskr]

Sometimes google_sign_in can end up non-responsive. Below is the line of code that will cause no progress similar to what was described here (#10552).

However, when I reload the app I see the following error:

MissingPluginException(No implementation found for method init on channel plugins.flutter.io/google_sign_in)

I just do

await googleSignIn.signIn();

[mravn-google]

@vskr The error implies that the Android or iOS side of the plugin have not been registered.

Does #10912 (comment) help?

[vskr]

I looked at the comment in #10912 and it looks like everything is present, yet i still see the same error.

It fails on Android

• GoogleSignInPlugin.registerWith(registry.registrarFor("io.flutter.plugins.googlesignin.GoogleSignInPlugin"));

• GeneratedPluginRegistrant.registerWith(this);

Is this error frequently reported by users. Not sure how to proceed. I am doing what most of the docs say and yet it doesn't work.

Other weird behavior I see is, first time I run flutter run it gets stuck on await googleSignIn.SignIn().

Only after I do a hot reload (by typing "r"), I see the above error message of :

E/flutter (12326): MissingPluginException(No implementation found for method init on channel plugins.flutter.io/google_sign_in)

Question: Are there any alternatives to do basic auth on Flutter applications. I just need some kind of basic auth so that my server can know which user it is serving data to.

[vskr]

I also created an entirely new project to see if the issue was because of my application.

Even in the new application I am running into the issue.

Fyi, if any of this helps, I am running my application in an emulator, and

When registering my application in Google SErvices, I used ~/android/debug.keystore to generate sha1 certificate.

[mravn-google]

@vskr Sorry for all the trouble. I'll see if I can reproduce. Would you mind running flutter doctor and pasting the output here for the record? Thanks.

[mravn-google]

@vskr I've got it working with a new project created using Flutter alpha channel and google_sign_in version 1.0.3. And also with a new project created using Flutter master channel and google_sign_in version 2.0.1.

I don't believe I did anything special, so I need to ask for more detailed information. Can you let me know step by step how you get to the MissingPluginException error, including versioning information?

It might also be interesting to know if the google_sign_in example app from https://github.com/flutter/plugins gives you the same error.

[vskr]

Here is the flutter doctor output

[✓] Flutter (on Mac OS X 10.12.6 16G29, locale en-US, channel alpha)
    • Flutter at /Users/vskr/flutter
    • Framework revision 8f65fec5f5 (6 weeks ago), 2017-12-12 09:50:14 -0800
    • Engine revision edaecdc8b8
    • Tools Dart version 1.25.0-dev.11.0
    • Engine Dart version 2.0.0-edge.d8ae797298c3a6cf8dc9f4558707bd2672224d3e

[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
    • Android SDK at /Users/vskr/Library/Android/sdk
    • Android NDK location not configured (optional; useful for native profiling support)
    • Platform android-27, build-tools 27.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b08)

[-] iOS toolchain - develop for iOS devices (Xcode 9.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 9.1, Build version 9B55
    ✗ libimobiledevice and ideviceinstaller are not installed. To install, run:
        brew install --HEAD libimobiledevice
        brew install ideviceinstaller
    ✗ ios-deploy not installed. To install:
        brew install ios-deploy
    ✗ CocoaPods not installed.
        CocoaPods is used to retrieve the iOS platform side's plugin code that responds to your plugin usage on the Dart side.
        Without resolving iOS dependencies with CocoaPods, plugins will not work on iOS.
        For more info, see https://flutter.io/platform-plugins
      To install:
        brew install cocoapods
        pod setup

[✓] Android Studio (version 3.0)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Java version OpenJDK Runtime Environment (build 1.8.0_152-release-915-b08)

[✓] IntelliJ IDEA Community Edition (version 2017.3.1)
    • Flutter plugin version 18.0
    • Dart plugin version 172.4155.35

[✓] Connected devices
    • Android SDK built for x86 • emulator-5554 • android-x86 • Android 8.0.0 (API 26) (emulator)

[vskr]

Steps I did to see the MissingPluginException.

1. Start with a new flutter project in Android Studio (3.0.1)
2. Change pubspec.yaml to include (google_sign_in: "^1.0.3")
3. Change sample application that comes when you create a flutter application to call _handleSignIn()

I attached my main.dart with my modifications in. (github doesn't support uploading .dart extension, so please convert my .txt to .dart )

These are all the steps, nothing fancy.

main.dart.txt

[vskr]

One more step I performed before [3] above:

Registering my application at

• https://developers.google.com/mobile/add?platform=android
• Create SHA1 cert using ~/android/debug.keystore (command used: keytool -exportcert -list -v -alias androiddebugkey -keystore ~/.android/debug.keystorekeystore)

[mravn-google]

@vskr So I tried the same thing, with your main.dart, and it works nicely for me :-/

One thing I noticed is that the version of the IDE Flutter plugin reported by your flutter doctor run is version 18.0 which is quite old (we're at v21 now). It doesn't say explicitly which version you use with Android Studio, but it may be worth it to check for updates.

To rule out any problems with the IDE plugin, can I ask you to try the following:

• Start an Android device emulator
• Open a terminal and cd to your project root folder (the one containing your pubspec.yaml file)
• Execute flutter run

[vskr]

Yup I typically do run using flutter run on command line. and i am still seeing the same behavior. At this point it feels like it is my setup thats causing the issue (since my main.dart works fine for you). But I have no idea how to proceed further and debug/fix this issue.

Something strange I observed: I tried to downgrade google_sign_in to 1.0.3 in pubspec.yaml but somehow pubspec.lock file still contains 2.0.1 version. Am relatively new to dart/flutter. Does that mean my change in pubspec.yaml hasn't been applied.

[vskr]

I tried to copy google_sign_in.dart and src/common.dart into my application, instead of installing them. Still see the same error.

E/flutter ( 6713): MissingPluginException(No implementation found for method init on channel plugins.flutter.io/google_sign_in)
E/flutter ( 6713): #0      MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:153:7)
E/flutter ( 6713): <asynchronous suspension>
E/flutter ( 6713): #1      GoogleSignIn._callMethod (/data/user/0/com.yourcompany.trainthebots/cache/trainthebotsCTFGOP/trainthebots/lib/google_sign_in.dart:146:33)
E/flutter ( 6713): <asynchronous suspension>
E/flutter ( 6713): #2      GoogleSignIn._addMethodCall.<anonymous closure> (/data/user/0/com.yourcompany.trainthebots/cache/trainthebotsCTFGOP/trainthebots/lib/google_sign_in.dart:196:28)

[mravn-google]

Something strange I observed: I tried to downgrade google_sign_in to 1.0.3 in pubspec.yaml but somehow pubspec.lock file still contains 2.0.1 version. Am relatively new to dart/flutter. Does that mean my change in pubspec.yaml hasn't been applied.

The pubspec.yaml change is applied when you execute flutter run or flutter packages get (the former invokes the latter, if necessary).

I tried to copy google_sign_in.dart and src/common.dart into my application, instead of installing them. Still see the same error.

Right, so the error does not appear to be on the Dart side of things, but rather on the Java side. Not clear to me how this might happen though. I'd try clearing out all the cached build and dependency artifacts in your Flutter project:

rm -rf .packages pubspec.lock .flutter-plugins build/ android/.gradle/

(There are also global Gradle and pub caches at ~/.gradle and ~/.pub-cache, but really you shouldn't have to clean out those.)

Could you provide the (verbose) output of flutter run -v here, in case there are any illuminating messages in there?

[csbenjamin]

I was also facing this issue in my old project. My project was created with flutter alpha channel and after that I upgraded manually to use gradle 4.1. Now I just created a new project using flutter master channel and the issue is gone.

[vskr]

How do I test with master channel. Clone 'master' branch instead of 'alpha' branch from github repository?