背景：

1、新版本1.12+與老版本引入方式發(fā)生了變化，特此記錄
2、FlutterView已經廢棄，替換為FlutterFragment，但它不支持生命周期管理，需要借助Activity

Flutter module工程結構預覽

image.png

開始打包

  1、首先連接真機，run一下，保證正常啟動Flutter應用
  2、flutter clean（在flutter根目錄輸入）
  3、flutter build aar
      
  注意：如果flutter工程中使用第三方庫那么需要用到fat-aar 插件工具
  詳細[https://blog.csdn.net/weixin_31925685/article/details/112531943](https://blog.csdn.net/weixin_31925685/article/details/112531943)
  https://juejin.im/post/5e153f10f265da5d6b3cb767
  https://blog.csdn.net/qizewei123/article/details/102768038
  第三方Fat-aar  https://github.com/kezong/fat-aar-android

截屏2021-10-19 下午10.47.16.png

接入方式一（依賴本地倉庫）

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
    }
  }
}

詳細介紹：

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

接入方式二 (不依賴本地倉庫) 推薦

1、找到你的flutter根目錄下的build/host/outputs/repo，將flutter_release-1.0.aar復制到android項目下

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

image.png

2、打開你的安卓工程，將aar copy到libs目錄下

image.png

3、app build.grade配置 也可以上傳maven

repositories {
    flatDir {
    dirs 'libs'   // aar目錄
  }
}
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 來自哪里呢？
姿勢：找到flutter根目錄下的build/host/outputs/repo, 將flutter_release-1.0.pom，里面有如下flutter基礎庫的地址
  <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、外層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、組件化工程通常是在某個module/lib下依賴，比如module_flutter

 在module_flutter build.gradle下配置
  repositories {
      flatDir {
        dirs 'libs'   // aar目錄
      }
    }

在主App 下配置
repositories {
//    詳細路徑
flatDir {
    dirs 'libs', '../module_flutter/libs'
  }
}

6、在你的MainActivity 加入如下代碼

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

/**
 * 原生安卓跳轉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));
  }
}

7、在你的清單文件中加入FlutterActivity，注意導包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>

8、run你的Android程序，將看到：

image.png

9、與Flutter通信

 public class BaseFlutterActivity extends FlutterActivity {
 //跳轉該頁面的時候可以傳要跳轉的頁面,參數名固定為route
 private static final String ROUTE_PAGE = "route";
 private static final String CHANNEL = "channel_test";
 public void onCreate(@Nullable Bundle savedInstanceState) {
    //初始化Flutter
    super.onCreate(savedInstanceState);

    new MethodChannel(getFlutterEngine().getDartExecutor().getBinaryMessenger(), CHANNEL).setMethodCallHandler(
            (call, result) -> {
                if (call.method.equals("getRes")) {
                    Toast.makeText(BaseFlutterActivity.this, "來自 flutter 的 toast ", Toast.LENGTH_LONG).show();
                    result.success("我是Android App");
                } else if (TextUtils.equals("exit", call.method)) {
                    finish();
                } else {
                    result.notImplemented();

                }
            });
  }
 }