Error while handling Appcheck with flutter - flutter

Question

I want to upload files in the firebase storage, but i have an error of appcheck after many researches, i saw that i have to activate Appcheck on firebase, but also to activate it on my application
in a google video on youtube, i have seen that i have to call this function while building my app:
initFirebase(){
FirebaseApp.initializeApp(/*context*/ this);
FirebaseAppCheck firebaseAppCheck = FirebaseAppCheck.getInstance();
firebaseAppCheck.installAppCheckProviderFactory(
SafetyNetAppCheckProviderFactory.getInstance());
}
But i have errors, that the methods "initializeApp";"getInstance" and "installAppCheckProviderFactory" are not defined,

Answer 1

Your MainActivity.kt shoul look like this:
package com.example.app //your package name
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/battery"
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()
)
}
}
}
And your main.dart like this:
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();
}