Answers for "Error: MissingPluginException(No implementation found for method getApplicationDocumentsDirectory on channel plugins.flutter.io/path_provider)"

MissingPluginException(No implementation found for method getAll on channel plugins.flutter.io/shared_preferences)

inside main.dart before start app add below code

SharedPreferences.setMockInitialValues({});

for reason:
https://stackoverflow.com/questions/50687801/flutter-unhandled-exception-missingpluginexceptionno-implementation-found-for

missingpluginexception (missingpluginexception(no implementation found for method firebase#initializecore on channel plugins.flutter.io/firebase_core)

buildTypes {       
    release {
        signingConfig signingConfigs.release
        minifyEnabled false
        shrinkResources false
    }
}

unhandled exception: missingpluginexception(no implementation found for method launch on channel plugins.flutter.io/url_launcher)

If you are using hot restart or hot reload, it won't do the trick. Since Flutter has to inject plugin dependencies into the platform-specific parts of your app, hot restart/hot reload is not enough to trigger the injection. Check this issue for more.

Close the app and execute flutter run command.