添加Flutter模块到已有项目(Android)

清疚 2021-12-24 09:45 371阅读 0赞

### 创建Flutter模块 ###

#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

### 主工程配置 ###

#### app的build.gradle ####

android{ 
    	......
    	compileOptions { 
    	  sourceCompatibility 1.8
    	  targetCompatibility 1.8
    	}	
    }
    
    dependencies { 
      implementation project(':flutter')
    }

#### settings.gradle ####

#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'                          
    ))

通过以上配置，sync后，在Android Studio目录结构中，就会多出一个flutter模块.

### 编写Widget ###

使用window.defaultRouteName()获取当前Android传入的标识符.  
在main.dart中编写以下代码

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),
          );
      }
    }

### Java代码获取Flutter的Widget ###

使用Flutter.createView(Context,Lifecycle,string)获取widget.

//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"
    		);
        }
    }