Flutter/Dart - FlutterFirebaseMessagingPlugin.java - Build fails with Exception "error: cannot find symbol"

Question

升级到 Null Safety 后 sdk: ">=2.12.0 <3.0.0" 我尝试在 Android Studio 中构建我的 Flutter 应用程序时遇到错误。

C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_messaging-9.1.4\android\src\main\java\io\flutter\plugins\firebase\messaging\FlutterFirebaseMessagingPlugin.java:20: error: cannot find symbol
    import com.google.firebase.iid.FirebaseInstanceId;
                                  ^
      symbol:   class FirebaseInstanceId
      location: package com.google.firebase.iid
    C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_messaging-9.1.4\android\src\main\java\io\flutter\plugins\firebase\messaging\FlutterFirebaseMessagingPlugin.java:21: error: cannot find symbol
    import com.google.firebase.iid.Metadata;
                                  ^
      symbol:   class Metadata
      location: package com.google.firebase.iid
    C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_messaging-9.1.4\android\src\main\java\io\flutter\plugins\firebase\messaging\FlutterFirebaseMessagingPlugin.java:152: error: cannot find symbol
                      : Metadata.getDefaultSenderId(FirebaseApp.getInstance());
                        ^
      symbol:   variable Metadata
      location: class FlutterFirebaseMessagingPlugin
    C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_messaging-9.1.4\android\src\main\java\io\flutter\plugins\firebase\messaging\FlutterFirebaseMessagingPlugin.java:153: error: cannot find symbol
              FirebaseInstanceId.getInstance().deleteToken(senderId, "*");
              ^
      symbol:   variable FirebaseInstanceId
      location: class FlutterFirebaseMessagingPlugin
    C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_messaging-9.1.4\android\src\main\java\io\flutter\plugins\firebase\messaging\FlutterFirebaseMessagingPlugin.java:165: error: cannot find symbol
                      : Metadata.getDefaultSenderId(FirebaseApp.getInstance());
                        ^
      symbol:   variable Metadata
      location: class FlutterFirebaseMessagingPlugin
    C:\flutter\.pub-cache\hosted\pub.dartlang.org\firebase_messaging-9.1.4\android\src\main\java\io\flutter\plugins\firebase\messaging\FlutterFirebaseMessagingPlugin.java:166: error: cannot find symbol
              String token = FirebaseInstanceId.getInstance().getToken(senderId, "*");
                             ^
      symbol:   variable FirebaseInstanceId
      location: class FlutterFirebaseMessagingPlugin

Android Studio 告诉我 FlutterFirebaseMessagingPlugin.java“找不到符号”。那么这是什么意思，我该如何解决

Answer 1

将 pusbpec.yaml 中的 firebase_messaging 更新为支持空安全的版本（例如：firebase_messaging: ^10.0.0，并调用 flutter pub get from 终端

Answer 2

首先，从 pub.dev

获取最新版本的 firebase 依赖项

运行命令：

flutter pub upgrade
flutter pub get
flutter clean

使缓存无效并重新启动

然后尝试运行应用程序

Answer 3

对我来说，问题是我在 app/gradle 文件中将 androidx 核心版本从 1.0.1 更新到 1.5.0，但我没有在项目级别 gradle 文件中更新它resolutionStrategy

它们应该是一样的。

Flutter/Dart - FlutterFirebaseMessagingPlugin.java - Build fails with Exception "error: cannot find symbol"

Flutter/Dart - FlutterFirebaseMessagingPlugin.java - Build fails with Exception "error: cannot find symbol"

java

dart

flutter

firebase-cloud-messaging