添加Flutter模块到已有项目(Android)

#进入指定目录
$ cd 
#使用命令创建flutter模块,flutter_module是模块名
$ flutter create -t module flutter_module

android{
  ......
  compileOptions {
    sourceCompatibility 1.8
    targetCompatibility 1.8
  } 
}

dependencies {
  implementation project(':flutter')
}

#原有的代码
include ':app'
#新增的代码                                     
setBinding(new Binding([gradle: this]))                                
evaluate(new File(                                                      
  settingsDir.parentFile,
  #flutter模块路径                                               
  'my_flutter/.android/include_flutter.groovy'                          
))                                                                      

import 'dart:ui';
import 'package:flutter/material.dart';

void main() => runApp(_widgetForRoute(window.defaultRouteName));

//根据不同的标识符，返回不同的Widget.
Widget _widgetForRoute(String route) {
  switch (route) {
    case 'route1':
      return SomeWidget(...);
    case 'route2':
      return SomeOtherWidget(...);
    default:
      return Center(
        child: Text('Unknown route: $route', textDirection: TextDirection.ltr),
      );
  }
}

//获取Flutter Widget
public class MainActivity extends AppCompatActivity {

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

        //route1代表传入的标识符
    View flutterView = Flutter.createView(
      MainActivity.this,
      getLifecycle(),
      "route1"
    );
    }
}