android - Flutter:尝试向 FlutterEngine 自动注册插件，但找不到并调用 GeneratedPluginRegistrant

Question

运行此命令时出现这些错误

flutter run --flavor development -t lib/config/main_development.dart --verbose-system-logs

错误:

Tried to automatically register plugins with FlutterEngine (io.flutter.embedding.engine.FlutterEngine@b5226bb) but could not find and invoke the GeneratedPluginRegistrant.

E/flutter (28896): [ERROR:flutter/lib/ui/ui_dart_state.cc(166)] Unhandled Exception: MissingPluginException(No implementation found for method initialize on channel flutter_stetho)

flutter 医生输出:

➜ flutter doctor -v                                                                         
[✓] Flutter (Channel master, 1.20.0-8.0.pre.22, on Mac OS X 10.14.6 18G3020, locale en)
    • Flutter version 1.20.0-8.0.pre.22 at /Users/vedantrathore/tools/flutter
    • Framework revision 61a04b1551 (11 hours ago), 2020-07-09 15:52:19 +0800
    • Engine revision 0ec6f6c3f2
    • Dart version 2.9.0 (build 2.9.0-20.0.dev 06cb010247)

 
[✓] Android toolchain - develop for Android devices (Android SDK version 29.0.3)
    • Android SDK at /Users/vedantrathore/Library/Android/sdk
    • Platform android-29, build-tools 29.0.3
    • Java binary at: /Applications/Android Studio.app/Contents/jre/jdk/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 11.3.1)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • Xcode 11.3.1, Build version 11C504
    • CocoaPods version 1.9.1

[✓] Android Studio (version 3.6)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin version 44.0.2
    • Dart plugin version 192.7761
    • Java version OpenJDK Runtime Environment (build 1.8.0_212-release-1586-b4-5784211)

[✓] VS Code (version 1.46.1)
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension version 3.12.1

[✓] Connected device (1 available)
    • GM1901 (mobile) • 192.168.29.75:5555 • android-arm64 • Android 10 (API 29)

• No issues found!

这是我的 app/build.gradle 文件

def localProperties = new Properties()
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.")
}

def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
if (flutterVersionCode == null) {
    flutterVersionCode = '1'
}

def flutterVersionName = localProperties.getProperty('flutter.versionName')
if (flutterVersionName == null) {
    flutterVersionName = '1.0'
}

apply plugin: 'com.google.gms.google-services'
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply from: "$flutterRoot/packages/flutter_tools/gradle/flutter.gradle"

android {
    compileSdkVersion 28

    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }

    lintOptions {
        disable 'InvalidPackage'
    }

    defaultConfig {
        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
        applicationId "com.habitwave"
        minSdkVersion 18
        targetSdkVersion 28
        versionCode flutterVersionCode.toInteger()
        versionName flutterVersionName
    }

    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
            minifyEnabled true
            useProguard true
        }
        debug{
            minifyEnabled true
            useProguard true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    flavorDimensions "flutter-flavours"

    productFlavors{
        development{
            dimension "flutter-flavours"
            versionNameSuffix "-dev"
        }
        staging{
            dimension "flutter-flavours"
            versionNameSuffix "-stg"
        }
        production{
            dimension "flutter-flavours"
        }
    }
}

flutter {
    source '../..'
}

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"

    implementation 'com.google.firebase:firebase-analytics:17.2.2'
}

我正在尝试使用flutter_secure_storage包，因此我必须将minSdkVersion设置为18并使用Proguard规则来避免multiDex(因为这需要minSdkVersion 21)
我尝试过的解决方案:

运行flutter clean , 卸载应用程序, 清除 ~/.pub-cache

从稳定版

移至主 channel

编辑 :
我通过深入研究解决了这个问题，并在 Android Studio 中打开了应用程序，进入了 Flutter 实现 Activity 并设置了一个断点，它尝试注册插件，然后当我运行应用程序时，我发现错误是 FacebookSdk 是'没有初始化。我正在使用 pub.dev/packages/flutter_facebook_login 包并忘记了 android 初始化。可以改进错误处理以适应这些场景

Answer 1

今天我面临同样的问题。我认为这与此有关:
https://flutter.dev/docs/development/packages-and-plugins/plugin-api-migration
(这可能只是临时解决方案)
我将注册人回信给我的MainActivity.kt - 如果你的类(class)是空的，它可能会有所帮助

package your.package.name

import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugins.GeneratedPluginRegistrant

class MainActivity: FlutterActivity() {
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }
}