Flutter firebase_messaging：^6.0.13 失败，但有异常：

Question

我正在尝试使用 firebase_messaging 实现推送通知：^6.0.13，
Flutter：为 firebase_messaging 构建错误”

我查看了所有类似的案例，将我的项目迁移到 AndroidX，但我仍然无法解决我的 Android 构建错误：

遵循的程序。

1. Flutter 干净

2. flutter 包发布缓存修复

3. 重启安卓

4. 重新制作模拟器没有任何效果

5. 将项目迁移到 AndroidX
6. 已尝试降级插件版本

例外：

Using hardware rendering with device Android SDK built for x86. If you get graphics artifacts, consider enabling software rendering with "--enable-software-rendering".
Launching lib/main.dart on Android SDK built for x86 in debug mode...
Initializing gradle...                                              0.6s
Resolving dependencies...                                           2.5s
/home/rajeshpatil/Downloads/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_messaging-6.0.13/android/src/main/java/io/flutter/plugins/firebasemessaging/FirebaseMessagingPlugin.java:80: error: cannot find symbol
    onAttachedToEngine(binding.getApplicationContext(), binding.getBinaryMessenger());
                                                               ^        
  symbol:   method getBinaryMessenger()                                 
  location: variable binding of type FlutterPluginBinding               
1 error                                                                 

FAILURE: Build failed with an exception.                                

* What went wrong:                                                      
Execution failed for task ':firebase_messaging: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 2s                                                      
Running Gradle task 'assembleDebug'...                                  
Running Gradle task 'assembleDebug'... Done                         3.3s
Gradle task assembleDebug failed with exit code 1

项目级/build.gradle：

    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:3.5.3'
        classpath 'com.google.gms:google-services:4.3.3'
    }
}

allprojects {
    repositories {
        google()
        jcenter()
    }
}

rootProject.buildDir = '../build'
subprojects {
    project.buildDir = "${rootProject.buildDir}/${project.name}"
}
subprojects {
    project.evaluationDependsOn(':app')
}

task clean(type: Delete) {
    delete rootProject.buildDir
}

应用级/build.gradle：

def localPropertiesFile = rootProject.file('local.properties')
if (localPropertiesFile.exists()) {
    localPropertiesFile.withReader('UTF-8') { reader ->
        localProperties.load(reader)
    }
}

def flutterRoot = localProperties.getProperty('flutter.sdk')
if (flutterRoot == null) {
    throw new GradleException("Flutter SDK not found. Define location with flutter.sdk in the local.properties file.")
}

apply plugin: 'com.android.application'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 28

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.example.helloworld"
        minSdkVersion 16
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        multiDexEnabled true
    }

    buildTypes {
        release {
            // TODO: Add your own signing config for the release build.
            // Signing with the debug keys for now, so `flutter run --release` works.
            signingConfig signingConfigs.debug
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.0'
    implementation 'com.google.firebase:firebase-analytics:17.2.2'
}

apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'

gradle.properties：

android.enableR8=true
android.useAndroidX=true
android.enableJetifier=true

颤振医生：

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel beta, v1.10.7, on Linux, locale en_IN)

[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.2)
[✓] Android Studio (version 3.5)
[✓] VS Code (version 1.43.0)
[✓] Connected device (1 available)

• No issues found!

Answer 1

看起来你正在处理一个较旧的 Flutter 项目，尝试一些事情，看看这些是否有帮助。

1) 更新您的颤振 SDK。您当前使用的是相当旧的颤振版本，以及从未稳定发布的 beta 版本。即使这不能解决您的问题，升级也是明智之举。您可以通过在终端中运行 flutter upgrade 来实现。

2) 您可能正在尝试使用某些 Firebase 软件包的旧版本，包括消息传递。尝试更改classpath 'com.google.gms:google-services:4.3.0' 在你的项目 gradle.build 到classpath 'com.google.gms:google-services:3.2.1'。仅当更新您的 Flutter SDK 无法解决问题，并且如果这无助于改回问题时，才执行此操作。

3) 尝试在 app-level/build.gradle 中增加项目的 minSDKVersion，过去当我遇到类似问题时，这解决了我在 sdk 版本 21 周围的问题。