android嵌入flutter module实现

使用场景：android原生页面直接跳转flutter功能页面

实现方式：

 1. 将flutter代码打包成aar引入android项目，flutter代码对原生不可见
 2. 将flutter代码引入android项目，flutter代码对原生可见

实现方式一：将flutter代码打包成aar引入android项目，flutter代码对原生不可见

1、创建flutter module项目

flutter module项目是可以单独运行的，项目结构同flutter Application类似，只不过这里是.android和.ios。

2、将flutter module打包成aar文件夹

按如下路径对module进行打包，打包完成后会生成系统的aar集成提示。


其中：
①aar生成的路径，如下图
②③④原生项目需要相应添加的代码

3、打开需要嵌入flutter代码的Android原生项目，分别导入上图的①②③④。

①：直接拷贝过来，repo文件是aar生成的路径
②：maven直接引用你本地的aar文件夹路径，这里是放在了app目录下。
代码：

buildscript {
    repositories {
        google()
        jcenter()
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:4.1.0'
    }
}

allprojects {
    String storageUrl = System.env.FLUTTER_STORAGE_BASE_URL ?: "https://storage.googleapis.com"
    repositories {
        google()
        jcenter()
        maven {
            url 'repo'  //这里引用你本地的aar文件夹路径
        }
        maven {
            url "$storageUrl/download.flutter.io"
        }
    }
}

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

③④：引用aar依赖

plugins {
    id 'com.android.application'
}

android {
    compileSdk 30

    defaultConfig {
        //compileSdk 30编译失败解决
        configurations.all {
            resolutionStrategy { force 'androidx.media2:media2-session:1.1.3' }
            resolutionStrategy { force 'androidx.media2:media2-common:1.1.3' }
            resolutionStrategy { force 'androidx.core:core:1.6.0' }
            resolutionStrategy { force 'androidx.core:core-ktx:1.6.0' }
        }
        applicationId "com.example.aar_local"
        minSdk 21
        targetSdk 32
        versionCode 1
        versionName "1.0"
        multiDexEnabled true

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    lintOptions {
        checkReleaseBuilds false
        abortOnError false
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.3.0'
    implementation 'com.google.android.material:material:1.4.0'
    implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
    testImplementation 'junit:junit:4.13.2'
    androidTestImplementation 'androidx.test.ext:junit:1.1.3'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'

    //aar依赖
    debugImplementation 'com.example.flutter_module:flutter_debug:1.0'
    releaseImplementation 'com.example.flutter_module:flutter_release:1.0'
}

另外settings.gradle：

rootProject.name = "aar_local"
include ':app'

4、同步android项目代码运行即可。

实现方式二：将flutter代码引入android项目，flutter代码对原生可见

1、创建flutter module项目

同实现方式一。

2、将flutter module直接拷贝至android项目下（和app平级）

3、android原生导入flutter依赖配置

settings.gradle添加：

//引入flutter_module
//使用方式
//startActivity(FlutterActivity.withNewEngine().build(MainActivity.this));
rootProject.name = "shukuang_jiangning"
include ':app'
setBinding(new Binding([gradle: this]))
//这里是当前flutter_module的位置，最好是把flutter module放在和当前android项目平级的文件夹里面
evaluate(new File(
        settingsDir.parentFile,
        'flutter_module/.android/include_flutter.groovy'
))
include ':flutter_module'
project(':flutter_module').projectDir = new File('../flutter_module')

app/build.gradle添加：

dependencies {
    //flutter引用
    implementation project(':flutter')
}

AndroidManifest.xml添加：

最后附上flutter和原生的交互代码

flutter main.dart：

import 'dart:convert';
import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:jk_framework/jk_framework.dart';
import 'package:module_alarm_record/ui/alarm_record_page.dart';
import 'package:module_monitor_new/ui/monitor_page.dart';

import 'package:module_inspection/ui/task/station/show/home/task_list_page.dart';
import 'package:module_video/ui/video_home_page.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  //初始化存储管理
  await StorageManager.initSP();
  EventbusManager.init();

  config();

  runApp(MyApp(initParams: window.defaultRouteName));
}

///配置主机地址
void config() {
  // 海康环境配置
  CacheManager.put('videoBaseUrl', 'xxx');
  CacheManager.put('videoAppKey', 'xxx');
  CacheManager.put('videoAppSecret', 'xxx');

  //接口地址
  CacheManager.put('baseUrl', 'xxx');
  //配置图片前缀
  CacheManager.put('baseImageUrl', 'xxx');
  // 配置待办流程为h5时的ip地址
  CacheManager.put('baseWebUrl', 'xxx');
}

class MyApp extends StatefulWidget {
  final String? initParams;

  const MyApp({Key? key, this.initParams}) : super(key: key);

  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'flutter_module',
      home: _createJumpPage(),
    );
  }

  //配置不同的跳转页面，这里接收原生token
  Widget _createJumpPage() {
    Map initParams = {};
    try {
      initParams = json.decode(widget.initParams ?? '');
    } catch (e) {
      return MyHomePage(title: 'Flutter Demo Home Page');
    }
    Map params = initParams;
    String route = params['route'];
    String token = params['token'];
    CacheManager.put(CacheManager.token, token);
    if (route.contains('module_video')) {
      return DMVideoPage();
    } else if (route.contains('module_inspection')) {
      return TaskListPage();
    } else if (route.contains('module_monitor')) {
      return DMMonitorPage();
    } else if (route.contains('module_alarm')) {
      return AlarmRecordPage();
    } else {
      return MyHomePage(title: 'Flutter Demo Home Page');
    }
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State createState() => _MyHomePageState();
}

class _MyHomePageState extends State {
  int _counter = 0;

  @override
  void initState() {
    super.initState();
  }

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
        leading: BackButton(
          onPressed: () {
            SystemNavigator.pop();
          },
        ),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

android MainActivity.java：

package com.example.aar_local;

import androidx.appcompat.app.AppCompatActivity;
import io.flutter.embedding.android.FlutterActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {
    //模拟跳转
    String token = "xxx";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        startActivity(
                FlutterActivity
                        .withNewEngine()
                        .initialRoute("{\"route\":\"module_video\",  \"token\": \"" + token + "\"}")
//                        .initialRoute("{\"route\":\"module_monitor\",  \"token\": \"" + token + "\"}")
//                        .initialRoute("{\"route\":\"module_inspection\",  \"token\": \"" + token + "\"}")
                        .build(MainActivity.this)
        );
    }
}

android AndroidManifest.xml：