App check android installation

[Albertbol]

Hey,
Please provide a better explanation of how to integrate App check for android and add working Kotlin snippet, most of the users don't have MainActivity.java only Kotlin MainActivity file and even creating it with flutter create -a java . and importing java snippet throws an error.
android/app/src/main/java/project_folder/MainActivity

package *name*

import io.flutter.embedding.android.FlutterActivity;
import com.google.firebase.appcheck.FirebaseAppCheck;


public class MainActivity extends FlutterActivity {
    FirebaseApp.initializeApp(this);
    FirebaseAppCheck firebaseAppCheck = FirebaseAppCheck.getInstance();
    firebaseAppCheck.installAppCheckProviderFactory(DebugAppCheckProviderFactory.getInstance());
}

Throws:

Running Gradle task 'assembleDebug'...
/MainActivity.java:8: error: <identifier> expected
    FirebaseApp.initializeApp(this);
                             ^
/MainActivity.java:8: error: illegal start of type
    FirebaseApp.initializeApp(this);
                              ^
/MainActivity.java:10: error: <identifier> expected
    firebaseAppCheck.installAppCheckProviderFactory(DebugAppCheckProviderFactory.getInstance());
                                                   ^
/MainActivity.java:10: error: <identifier> expected
    firebaseAppCheck.installAppCheckProviderFactory(DebugAppCheckProviderFactory.getInstance());
                                                                                          ^
4 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugJavaWithJavac'.
> Compilation failed; see the compiler error output for details.

* 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 17s
Exception: Gradle task assembleDebug failed with exit code 1

Thanks

[seanyyyyyy]

could working implementations for debug provider be put inside the Example repo too?
https://github.com/FirebaseExtended/flutterfire/tree/master/packages/firebase_app_check/firebase_app_check/example

[darshankawar]

@Albertbol
There's similar open issue describing your case, #6468
Please follow-up there for updates.
Closing this as duplicate.