Android 颤振错误：错误：无法解析包'；firebase#u消息传递'；在'；软件包：firebase_messaging/firebase_messaging.dart'；

我正在构建一个使用Firebase消息的Flitter Android应用程序。但是，我在编译时遇到以下错误：

Error: Could not resolve the package 'firebase_messaging' in 
'package:firebase_messaging/firebase_messaging.dart'.

以下是相关代码摘录：

Android\Build.Gradle:

buildscript {

    repositories {
        google()
    
    }

dependencies {
    classpath 'com.android.tools.build:gradle:3.5.0'
    classpath 'com.google.gms:google-services:4.3.3'
}
}
allprojects {
repositories {
    google()
    jcenter()
}

dependencies {
implementation 'com.google.firebase:firebase-messaging:20.2.4'

dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^0.5.2
  firebase_core: ^0.2.5

}

App\Build.Gradle:

buildscript {

    repositories {
        google()
    
    }

dependencies {
    classpath 'com.android.tools.build:gradle:3.5.0'
    classpath 'com.google.gms:google-services:4.3.3'
}
}
allprojects {
repositories {
    google()
    jcenter()
}

dependencies {
implementation 'com.google.firebase:firebase-messaging:20.2.4'

dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^0.5.2
  firebase_core: ^0.2.5

}

pubspec.yaml:

buildscript {

    repositories {
        google()
    
    }

dependencies {
    classpath 'com.android.tools.build:gradle:3.5.0'
    classpath 'com.google.gms:google-services:4.3.3'
}
}
allprojects {
repositories {
    google()
    jcenter()
}

dependencies {
implementation 'com.google.firebase:firebase-messaging:20.2.4'

dependencies:
  flutter:
    sdk: flutter
  shared_preferences: ^0.5.2
  firebase_core: ^0.2.5

---

您需要将

firebase\u消息：^7.0.0

添加到您的

pubspec.yaml