How to implement App Check in Flutter app - firebase

Question

I'm trying to implement App Check in my Flutter app for Android and have followed the flutterfire documentation. I have already complete the installation part outlined here: https://firebase.flutter.dev/docs/app-check/overview
Now I am following this documentation for usage: https://firebase.flutter.dev/docs/app-check/usage
So I have added the await FirebaseAppCheck.instance.activate(webRecaptchaSiteKey: 'recaptcha-v3-site-key'); to my Main method, right after the call to initialize firebase.
Now I need to enable debugging with the App Check and the documentation says I should add this dependency to my app/build.gradle file: implementation 'com.google.firebase:firebase-appcheck-debug:16.0.0-beta01' and add the following code snippet to my MainActivity.java onCreate method:
import com.google.firebase.appcheck.FirebaseAppCheck;
FirebaseApp.initializeApp(/*context=*/ this);
FirebaseAppCheck firebaseAppCheck = FirebaseAppCheck.getInstance();
firebaseAppCheck.installAppCheckProviderFactory(DebugAppCheckProviderFactory.getInstance());
Which I have tried to do by creating the MainActivity.java with the following command in my project root folder: flutter create -a java .
So my MainActivity.java looks like this:
import io.flutter.embedding.android.FlutterActivity;
import com.google.firebase.appcheck.FirebaseAppCheck;
public class MainActivity extends FlutterActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FirebaseApp.initializeApp(/*context=*/ this);
FirebaseAppCheck firebaseAppCheck = FirebaseAppCheck.getInstance();
firebaseAppCheck.installAppCheckProviderFactory(
DebugAppCheckProviderFactory.getInstance());
}
}
When trying to run the app in debug mode I get the this error: Execution failed for task ':app:compileDebugJavaWithJavac'.
What am I missing? Have seen other posts with the same problem but no solution.

Answer 1

This should be your main.dart
import 'package:firebase_app_check/firebase_app_check.dart';
import 'package:firebase_core/firebase_core.dart';
import 'package:flutter/material.dart';
Future<void> main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
await FirebaseAppCheck.instance.activate();
}
Note: await FirebaseAppCheck.instance.activate(); does not have webRecaptchaSiteKey: 'recaptcha-v3-site-key' for Android/iOS App
This should be your MainActivity.kt
package com.example.app // your package
import androidx.annotation.NonNull
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.MethodChannel
import com.google.firebase.FirebaseApp
import com.google.firebase.appcheck.FirebaseAppCheck
import com.google.firebase.appcheck.debug.DebugAppCheckProviderFactory
class MainActivity: FlutterActivity() {
private val CHANNEL = "samples.flutter.dev/example"
override fun configureFlutterEngine(#NonNull flutterEngine: FlutterEngine) {
super.configureFlutterEngine(flutterEngine)
MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler {
call, result ->
FirebaseApp.initializeApp(/*context=*/this)
val firebaseAppCheck = FirebaseAppCheck.getInstance()
firebaseAppCheck.installAppCheckProviderFactory(
DebugAppCheckProviderFactory.getInstance()
)
}
}
}