SharedPreferences not instantiating in release build

Question

In my flutter application I have implemented a an onboarding view. As it should load only once, I have used shared preferences to store an integer to indicate that onboarding is already shown. When I run the application in debug mode everything works perfectly. But when I build the release version of it, it doesn’t work.

And also my application uses firebase mobile authentication. I am mentioning this since it may be a reason as well.

The code:

case InitializeEvent:
        SharedPreferences prefs = await SharedPreferences.getInstance();
        int initScreen = prefs.getInt(SharedPrefUtil.INIT_SCREEN);
        await prefs.setInt(SharedPrefUtil.INIT_SCREEN, 1);
        if (initScreen == 1) {
          add(CheckAppConfigEvent());
        } else {
          yield state.clone(page: RootState.ONBOARDING_PAGE);
        }
        yield state.clone(loading: false);
        break;

So in the above code, if I comment initializing shared pref, reading and writing lines and set true or false in if else statement everything works fine in release build. That’s why I think the issue is in initializing shared preferences.

And also I have given permission only for internet. Am I missing any permission in AndroidManifest.xml

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

Answer 1

My app was also not working in the release build and the issue is due to the shared_preferences package.

I'm getting the following error in the release build:

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

I tried several solutions:

1. switching the flutter channel
2. tried several versions of shared_preferences
3. deleting the .pub-cache folder as described here https://github.com/flutter/flutter/issues/38873#issuecomment-680788165

but nothing worked.

The app worked fine in the debug build but not in the release build.

Then I tried

flutter build apk --no-shrink

flutter build appbundle --no-shrink

and the app worked fine in the release build as well. But the issue is resolved without shrinking the code. So this needs to be fixed.

Hopefully, the Flutter team will look into the issue and will resolve that.

Edit:
Already reported the issue to the Flutter team.
https://github.com/flutter/flutter/issues/65334

Answer 2

Building with flutter build apk --no-shrink solved to me

Answer 3

replacing classpath 'com.android.tools.build:gradle:4.1.0' with classpath 'com.android.tools.build:gradle:3.5.0' in android/build.gradle file fixed the problem for me

Answer 4

it's really works for me and you can try----

use -> SharedPreferences.setMockInitialValues({});

void main() {
  SharedPreferences.setMockInitialValues({});

  SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
      systemNavigationBarColor: Colors.indigo[900], // navigation bar color
      statusBarColor: Colors.indigo[900],
      systemNavigationBarIconBrightness: Brightness.light));
  runApp(MyApp());
}

Answer 5

Maybe u have forgetten to add this line of code on MainActivity.java `@Override

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
GeneratedPluginRegistrant.registerWith(this.getFlutterEngine());
 }`

It worked on me

Answer 6

I just changed :

dependencies {
   classpath 'com.android.tools.build:gradle:**4.1.0**'
}

TO

dependencies {
   classpath 'com.android.tools.build:gradle:**3.5.0**'
}

Then

• flutter clean
• flutter build apk --release

it will work for sure.

Answer 7

The previous solutions did not work in my case, then I tried disabling these two then it worked.

minifyEnabled false shrinkResources false

Answer 8

I also faced the same problem. In my case the problem is not my code, the problem is the Gradle version. When I used any Gradle version greater than 4 then this problem occur. But when I reduced the Gradle version to 3.5.0 then It works fine. I also tested with Gradle 3.6.4 it also works fine.

Change this

dependencies {
        classpath 'com.android.tools.build:gradle:4.1.1'
    }

to

dependencies {
        classpath 'com.android.tools.build:gradle:3.6.4'
    }

Note: In flutter don't always upgrade your Gradle version