Flutter/Kotlin：未解决的参考：FlutterPlugin

Question

我正在开发一个 Flutter 项目，并尝试使用 Kotlin 原生实现 AlarmManager，但我遇到了与 Android Activity 相关的问题

以下是两个错误：

MainActivity.kt: (5, 33): 未解决的参考：FlutterPlugin

MainActivity.kt: (12, 35): 类型不匹配：推断类型为 FlutterEngine，但预期为 FlutterPlugin.FlutterPluginBinding

MainActivity.kt

package com.example.alarmapp

import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.FlutterPlugin
import io.flutter.plugins.GeneratedPluginRegistrant

class MainActivity : FlutterActivity() {
    override fun configureFlutterEngine(binding: FlutterEngine) {
        super.configureFlutterEngine(binding)
        val plugin = AlarmScheduler()
        plugin.onAttachedToEngine(binding)
    }
}

app/build.gradle 依赖项

dependencies {
    implementation 'org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.6.10'
    implementation 'io.flutter:embedding-android:3.16.5
    implementation 'io.flutter:flutte:3.16.5'  
    implementation 'io.flutter.plugins:flutter_plugin_android_lifecycle:2.0.0'
}

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkReleaseAarMetadata'.
> Could not resolve all files for configuration ':app:releaseRuntimeClasspath'.
   > Could not find io.flutter:embedding-android:3.0.5.
     Searched in the following locations:
       - https://dl.google.com/dl/android/maven2/io/flutter/embedding-android/3.0.5/embedding-android-3.0.5.pom
      
     Required by:
         project :app
> Could not resolve all files for configuration ':app:debugRuntimeClasspath'.
   > Could not find io.flutter:flutte:3.16.5.
     Searched in the following locations:
      - https://repo.maven.apache.org/maven2/io/flutter/flutte/3.16.5/flutte-3.16.5.pom
        
     Required by:
         project :app
   > Could not find io.flutter.plugins:flutter_plugin_android_lifecycle:2.0.0.
     Searched in the following locations:
       - https://dl.google.com/dl/android/maven2/io/flutter/plugins/flutter_plugin_android_lifecycle/2.0.0/flutter_plugin_android_lifecycle-2.0.0.pom
       
     Required by:
         project :app

Answer 1

要解决 Android 项目中对 FlutterPlugin 的未解析引用，您可以包含 Flutter SDK 中的 flutter.jar 作为依赖项。具体方法如下：

1. 在 Flutter SDK 路径中找到 flutter.jar 文件：

   flutter-sdk-path/bin/cache/artifacts/engine/android-arm64/flutter.jar

2. 将flutter.jar复制到项目的libs目录中：

   android/src/main/libs/

   （libs目录不存在则创建）。

3. 更新您的构建。 gradle 文件以将 flutter.jar 包含在依赖项中：

   依赖项{ 实现文件('src/main/libs/flutter.jar') }

   这应该修复对 FlutterPlugin 的未解析引用。