MissingPluginException when creating a .APK.

[ilikepi63]

trafficstars

The plugin works fine if using the android emulator, however once generating an apk using "flutter build apk", an exception is thrown where it cannot find the corresponding plugin. I have tested other plugins and it seems that this is the only one that is not working in this manner.

[yuensunn]

Same issue here.

[samuelchanx]

Same issue here...

Detailed logs:

FAILURE: Build failed with an exception.

* Where:
Build file 'xx/xx/flutter/.pub-cache/hosted/pub.dartlang.org/flutter_cognito_plugin-1.0.2/android/build.gradle' line: 45

* What went wrong:
A problem occurred evaluating root project 'flutter_cognito_plugin'.
> Project with path ':plugin_scaffold' could not be found in root project 'flutter_cognito_plugin'.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1m 54s

[yuensunn]

Update. Running flutter clean solved it for me. Update again. flutter clean did not solve the problem but flutter run --release did

[samuelchanx]

Resolved. In addition to adding the AWS rules for proguard, I excluded this plugin package to make it working even when proguard or R8 turned on.

-keepnames class com.amazonaws.** { *; }
-keepnames class com.amazon.** { *; }

# Flutter Cognito Pluggin
-keep class com.pycampers.** { *; }

Then the plugin would work even with obfuscation on Android.

[yuensunn]

@samuelchanx you're a lifesaver thanks a lot!

[bepitulaz]

@samuelchanx thank you, mate! you save my life. I struggle with this issue all day, and I'm not too familiar with native Android development.

[JeSuisAlrick]

In my case, the following worked for me:

...
-keep class com.amazonaws.** { *; }
-keep class com.amazon.** { *; }
-keep class com.pycampers.** { *; }

[bepitulaz]

Resolved. In addition to adding the AWS rules for proguard, I excluded this plugin package to make it working even when proguard or R8 turned on.

-keepnames class com.amazonaws.** { *; }
-keepnames class com.amazon.** { *; }

# Flutter Cognito Pluggin
-keep class com.pycampers.** { *; }

Then the plugin would work even with obfuscation on Android.

This one was okay before flutter_cognito_plugin version 2.0.0. After upgrading to version 2.0.0 this one is not working anymore. I spent 2 days making it works again, and I don't know why this combination below is working in version 2.0.0.

-keep class com.amazonaws.** { *; }
-keep class com.amazon.** { *; }
-keep class com.pycampers.** { *; }

[devxpy]

If you don't care about minifying, try adding the following to android/app/build.gradle.

android {
    ...

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

[kukuandroid]

Resolved. In addition to adding the AWS rules for proguard, I excluded this plugin package to make it working even when proguard or R8 turned on.

-keepnames class com.amazonaws.** { *; }
-keepnames class com.amazon.** { *; }

# Flutter Cognito Pluggin
-keep class com.pycampers.** { *; }

Then the plugin would work even with obfuscation on Android.

Hi, i am sorry, where can i put this codes ?

[samuelchanx]

@kukuandroid in ur proguard-rules.pro inside android directory

[fryette]

I think it should be in the readme

[itskgore]

Hey all I am facing this issue can someone provide the solution MissingPluginException(No implementation found for method attachPolicy on channel com.scientifichackers.aws_iot)