После добавления Firebase Authentication библиотеки в приложении флаттера, приложение не компилируется и вылетает с ошибкой ниже
Launching lib/main.dart on TECNO LA7 in debug mode... Initializing gradle... Resolving dependencies... Running Gradle task 'assembleDebug'... /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:8: error: package android.support.annotation does not exist import android.support.annotation.NonNull; ^ /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:534: error: cannot find symbol public void onComplete(@NonNull Task<AuthResult> task) { ^ symbol: class NonNull location: class FirebaseAuthPlugin.SignInCompleteListener /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:554: error: cannot find symbol public void onComplete(@NonNull Task<Void> task) { ^ symbol: class NonNull location: class FirebaseAuthPlugin.TaskVoidCompleteListener /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:572: error: cannot find symbol public void onComplete(@NonNull Task<ProviderQueryResult> task) { ^ symbol: class NonNull location: class FirebaseAuthPlugin.ProvidersCompleteListener /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:168: error: cannot find symbol public void onComplete(@NonNull Task<AuthResult> task) { ^ symbol: class NonNull /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:263: error: cannot find symbol public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { ^ symbol: class NonNull /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:416: error: cannot find symbol public void onComplete(@NonNull Task<GetTokenResult> task) { ^ symbol: class NonNull /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:445: error: cannot find symbol public void onComplete(@NonNull Task<Void> task) { ^ symbol: class NonNull /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:467: error: cannot find symbol public void onComplete(@NonNull Task<Void> task) { ^ symbol: class NonNull /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:483: error: cannot find symbol public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) { ^ symbol: class NonNull Note: /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java uses or overrides a deprecated API. Note: Recompile with -Xlint:deprecation for details. Note: /Users/mac/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.5.20/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 10 errors FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':firebase_auth: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 0s ******************************************************************************************* The Gradle failure may have been because of AndroidX incompatibilities in this Flutter app. ******************************************************************************************* Finished with error: Gradle task assembleDebug failed with exit code 1
Проблема в том, что плагин Firebase использует AndroidX.Вы должны отредактировать свой файл gradle.properties и добавить следующие две строки:
android.useAndroidX=true android.enableJetifier=true
Тогда может понадобиться очистка флаттера.