Flutter生成aar供Android依赖

背景：

新版本1.12+与老版本引入方式发生了变化，特此记录

工程结构预览

image.png

开始打包

  1、首先连接真机，run一下，保证正常启动应用；
  2、flutter clean 
  3、flutter build aar
      
  注意：如果flutter工程中使用第三方库那么需要用到fat-aar 插件工具
  详细https://juejin.im/post/5e153f10f265da5d6b3cb767
  第三方Fat-aar  https://github.com/kezong/fat-aar-android

使用方式一（依赖本地仓库）

1. Open <host>/app/build.gradle

2. Ensure you have the repositories configured, otherwise add them:

   repositories {
     maven {
         url 
             '/Users/niudong/Desktop/Project/android/flutter_library/build/host/outputs/repo'
         }
     maven {
     url '$storageUrl/download.flutter.io'
   }
   }
   

3. Make the host app depend on the Flutter module:

dependencies {
  debugImplementation 'com.example.flutter_library:flutter_debug:1.0'
  profileImplementation 'com.example.flutter_library:flutter_profile:1.0'
  releaseImplementation 'com.example.flutter_library:flutter_release:1.0'
}

4. Add the profile build type:

android {
  buildTypes {
    profile {
      initWith debug
    }
  }
}

详细介绍：

[https://flutter.dev/docs/development/add-to-app/android/project-setup#option-a---depend-on-the-android-archive-aar]

使用方式二 (不依赖本地仓库)

1、找到你的flutter根目录下的build/host/outputs/repo，将flutter_release-1.0.aar复制到android项目下

/Users/niudong/Desktop/Project/android/flutter_library/build/host/outputs/repo/com/example/flutter_library/flutter_release/1.0

image.png

2、打开你的安卓工程，将aar copy到libs目录下

image.png

3、app build.grade配置

repositories {
    flatDir {
    dirs 'libs'   // aar目录
  }
}
添加如下：
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation(name: 'flutter_release-1.0', ext: 'aar')
implementation 'io.flutter:flutter_embedding_release:1.0.0-626244a72c5d53cc6d00c840987f9059faed511a'
implementation 'io.flutter:armeabi_v7a_release:1.0.0-626244a72c5d53cc6d00c840987f9059faed511a'
implementation 'io.flutter:arm64_v8a_release:1.0.0-626244a72c5d53cc6d00c840987f9059faed511a'
implementation 'io.flutter:x86_64_release:1.0.0-626244a72c5d53cc6d00c840987f9059faed511a'
}

注意：1.0.0-626244a72c5d53cc6d00c840987f9059faed511a 来自哪里呢？
姿势：找到flutter根目录下的build/host/outputs/repo, 将flutter_release-1.0.pom，里面有如下flutter基础库的地址
  <groupId>com.example.flutter_library</groupId>
  <artifactId>flutter_release</artifactId>
  <version>1.0</version>
  <packaging>aar</packaging>
  <dependencies>
  <dependency>
  <groupId>io.flutter.plugins.sharedpreferences</groupId>
  <artifactId>shared_preferences_release</artifactId>
  <version>1.0</version>
  <scope>compile</scope>
  </dependency>
  <dependency>
  <groupId>io.flutter</groupId>
  <artifactId>flutter_embedding_release</artifactId>
  <version>1.0.0-626244a72c5d53cc6d00c840987f9059faed511a</version>
  <scope>compile</scope>
  </dependency>

4、外层build.grade配置

buildscript {
repositories {
    google()
    jcenter()
    maven {
        url "http://download.flutter.io"
    }
}
dependencies {
    classpath 'com.android.tools.build:gradle:4.0.0'
}

}
5、在你的MainActivity 加入如下代码

import androidx.appcompat.app.AppCompatActivity;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.view.FlutterMain;

/**
 * 原生安卓跳转Flutter
 */
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    FlutterMain.startInitialization(this);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    startActivity(FlutterActivity.createDefaultIntent(this));
  }
}

6、在你的清单文件中加入FlutterActivity，注意导包io.flutter.embedding.android

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.example.androiddemo">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:name=".FlutterApplication"
    android:theme="@style/AppTheme">
    <activity android:name="io.flutter.embedding.android.FlutterActivity"/>
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>
</manifest>

7、End！run你的Android程序：