android工程的根目录,在Android原生工程中集成Flutter

第一步 创建Android工程

在Android工程根目录的上一级目录创建Flutter工程，保证Flutter工程与Android工程在同一级。

cd Android工程根目录的上一级

创建Flutter工程：flutter create -t module flutter工程名

C:\Damon\flutter\lsn16\FlutterInAndroid\AndroidDemo>cd ..

C:\Damon\flutter\lsn16\FlutterInAndroid>flutter create -t module flutter_demo

第二步 编译Flutter工程

cd到Flutter工程目录下的.android目录，执行gradlew脚本

注意：点后面是反斜杠

C:\Damon\flutter\lsn16\FlutterInAndroid>cd flutter_demo

C:\Damon\flutter\lsn16\FlutterInAndroid\flutter_demo>cd .android

C:\Damon\flutter\lsn16\FlutterInAndroid\flutter_demo\.android>.\gradlew flutter:assembleDebug

第三步 在Android工程中加入Flutter Module的依赖

首先，修改Android项目根目录下的setting.gradle：

include ':app'

//加入下面配置

setBinding(new Binding([gradle: this]))

evaluate(new File(

settingsDir.parentFile,

'flutter_demo/.android/include_flutter.groovy'

))

然后，修改app下的build.gradle：

android {

...

defaultConfig {

...

minSdkVersion 16//至少16

...

}

...

//添加下面配置

compileOptions {

sourceCompatibility 1.8

targetCompatibility 1.8

}

}

...

dependencies {

...

//加入下面配置

implementation project(':flutter')

}

第四步 在Android工程中创建Flutter的View

/**

* 创建view

*/

View flutterView = Flutter.createView(MainActivity.this, getLifecycle(), "r1");

/**

* 创建Fragment

*/

Fragment flutterFragment = Flutter.createFragment("r2");

第五步 在Flutter工程中创建Widget

可以通过window的defaultRouteName获取路由名称，依此进行判断并创建不同的Widget给Android工程调用。

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

Widget selectWidget(String routeName) {

switch (routeName) {

case 'r1':

return MyFlutterView();

case 'r2':

return MyFlutterFragment();

default:

return MaterialApp(

debugShowCheckedModeBanner: false,

home: Scaffold(

body: Center(

child: Text(

'Unknow Route!',

style: TextStyle(color: Color(0xffff0000)),

),

),

),

);

}

}

第六步 让Flutter模块支持热加载

首先在Flutter Module工程目录下执行flutter attach，开始监听flutter。

C:\Damon\flutter\FlutterInAndroid\flutter_demo>flutter attach

Waiting for a connection from Flutter on SCL AL00...

然后，在Android工程中运行程序，运行成功后可以在终端输入小写r热加载，大写R热重启。

C:\Damon\flutter\FlutterInAndroid\flutter_demo>flutter attach

Waiting for a connection from Flutter on SCL AL00...

Done.

Syncing files to device SCL AL00...