由于 cloud firestore 和 firebase auth 错误，我的 Flutter 应用程序不再编译

Question

我花了几天时间尝试使用 Firebase 调试我的应用。 以前它工作得很好，直到上周我更新了很多东西； android studio、flutter、插件等 编译后这始终是我的结果；

import android.support.annotation.NonNull;
                                 ^
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:538: error: cannot find symbol
    public void onComplete(@NonNull Task<AuthResult> task) {
                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.SignInCompleteListener
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:558: error: cannot find symbol
    public void onComplete(@NonNull Task<Void> task) {
                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.TaskVoidCompleteListener
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:576: error: cannot find symbol
    public void onComplete(@NonNull Task<ProviderQueryResult> task) {
                            ^
  symbol:   class NonNull
  location: class FirebaseAuthPlugin.ProvidersCompleteListener
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:175: error: cannot find symbol
                      public void onComplete(@NonNull Task<AuthResult> task) {
                                              ^
  symbol: class NonNull
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:270: error: cannot find symbol
          public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                                          ^
  symbol: class NonNull
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:435: error: cannot find symbol
              public void onComplete(@NonNull Task<GetTokenResult> task) {
                                      ^
  symbol: class NonNull
/home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java:487: error: cannot find symbol
          public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
                                          ^
  symbol: class NonNull
Note: /home/baw/snap/flutter/common/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_auth-0.6.2+1/android/src/main/java/io/flutter/plugins/firebaseauth/FirebaseAuthPlugin.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
8 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 2m 48s
The built failed likely due to AndroidX incompatibilities in a plugin. The tool is about to try using Jetfier to solve the incompatibility.
Building plugin cloud_firestore...
Running Gradle task 'assembleAarRelease'...
Exception: The plugin cloud_firestore could not be built due to the issue above.

我尝试了有关 androidX 的不同修复，但我的项目已经迁移并且一直如此，所以似乎没有一个工作。

Flutter Doctor 输出还不错

[✓] Flutter (Channel beta, 1.24.0-10.2.pre, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK version 30.0.3)
[✓] Android Studio
[✓] Connected device (1 available)

• No issues found!```

Answer 1

找到解决方案！！

这确实是由 AndroidX 问题引起的，但迁移没有任何帮助。 所以我用来解决它的步骤是；

1. 打开 android 文件夹以使用 Android Studio 进行编辑。 2.运行 Gradle 同步。 3.运行应用程序。 （这显然会失败！但带您到使用 Android 支持库导入的文件。）

2. 删除 android support import(import android.support.annotations.NonNull) 并用 AndroidX import 替换它。

   导入 androidx.annotations.NonNull

（我不记得确切的导入语句，但你可以谷歌并得到它）

就是这样，一切顺利！