现有Android项目集成Flutter

1、创建fluttermodule，创建好的fluttermodule和Android项目是在同一级目录下

 //当前android项目的上级目录
 cd ../
 
 //创建fluttermodule
 //不支持Androidx
 flutter create -t module flutter_module
 
 //支持Androidx
 flutter create --androidx -t module flutter_module 

2、在settings.gradle文件中配置一下代码

rootProject.name='NativeApp'
include ':app'

setBinding(new Binding([gradle: this]))                                 
evaluate(new File(                                                     
        settingsDir.parentFile,                                               
        'flutter_module/.android/include_flutter.groovy'
))                                                                      
include ':flutter_module'
project(':flutter_module').projectDir = new File('../flutter_module')

3、app目录下build.gradle中

//最小改为16
minSdkVersion 19

4、app目录下build.gradle中添加依赖

android {
    ....
    //jdk1.8编辑，否则会报错
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

}

dependencies {
    ...
    //添加依赖
    implementation project(':flutter')
    ...
   
}

5、加载flutter页面

//在清单配置文件中注册activity

//跳转到flutter页面
startActivity(
           FlutterActivity
               .withNewEngine()
               .initialRoute("route1")
               .build(MainActivity.this)
       );

6、flutter中接受初始化参数

import 'dart:ui';

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    //获取初始化的参数
    window.defaultRouteName;
  }