flutter中android子工程报错,Flutter混合Android
1.新建一個Android工程
比如工程名MyApplication
2.創建Flutter Module
在cd到當前project下運行命令：
E:\MyApplication
flutter create -t module my_flutter
3.增加配置代碼
在工程setttings.gradle中增加配置:
include ':app'
setBinding(new Binding([gradle: this]))
evaluate(new File(settingsDir, 'my_flutter/.android/include_flutter.groovy'))
接下來在app的build.gradle增加依賴：
implementation project(':flutter')
可能會報錯：
Error: Invoke-customs are only supported starting with Android O (--min-api 26)
在app的build.gradle的android標簽下增加：
compileOptions{
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
最后生成的目錄結構：
Android混合Flutter.PNG
經過上面3步就已經集成Flutter了，接著看看怎么在Android工程中創建Flutter的UI
4.Android中創建Flutter UI
Flutter提供兩種方法引入，一個是View，一個是Fragment，看下View的代碼：
public class FlutterActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_flutter);
FlutterView view = Flutter.createView(this, getLifecycle(), "new_page");
FrameLayout.LayoutParams layoutParams = new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.MATCH_PARENT, FrameLayout.LayoutParams.MATCH_PARENT
);
addContentView(view, layoutParams);
}
}
第二個參數是Lifecycle對象，第三個參數是route，這個參數Flutter端可以通過window.defaultRouteName獲取
看下Flutter側的dart代碼, 在my_flutter->lib目錄下新建list.dart：
import 'package:flutter/material.dart';
class ListViewTest extends StatelessWidget {
@override
Widget build(BuildContext context) {
Widget divider1 = Divider(color: Colors.blue);
Widget divider2 = Divider(color: Colors.green);
return Scaffold(
appBar: AppBar(
// Here we take the value from the MyHomePage object that was created by
// the App.build method, and use it to set our appbar title.
title: Text('ListTest'),
),
body: Center(
child: ListView.separated(
itemBuilder: (BuildContext context, int index) {
return ListTile(
title: Text("$index"),
);
},
separatorBuilder: (BuildContext context, int index) {
return index % 2 == 0 ? divider1 : divider2;
},
itemCount: 100),
),
);
}
}
在main.dart中導出路由new_page:
import 'package:flutter/material.dart';
import 'list.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
routes: {
"new_page": (context) => ListViewTest(),
},
);
}
}
5.hot reload
進入到flutter module目錄下, 執行命令 flutter attach 即可, 在這個命令窗口按r即可hot reload:
E:\MyApplication\my_flutter
λ flutter attach
Waiting for a connection from Flutter on vivo x27...
Done.
Syncing files to device vivo x27... 1,125ms
🔥 To hot reload changes while running, press "r". To hot restart (and rebuild state), press "R".
An Observatory debugger and profiler on vivo 1819 is available at: http://127.0.0.1:55515/
For a more detailed help message, press "h". To detach, press "d"; to quit, press "q".
Initializing hot reload...
Reloaded 2 of 433 libraries in 969ms.
6.總結
最后對比看下繼承了Flutter和沒有繼承的Android工程打出來的Release包大小對比：
withFlutterApkSize.PNG
withoutFlutterApkSize.PNG
接入Flutter之后，包大小激增5M，主要是因為flutter.so這個so庫。還有flutter_assets里是flutter工程產生的assets文件, isolate_snapshot_data、isolate_snapshot_instr、vm_snapshot_data、vm_snapshot_instr為特定平臺的數據和指令.
總結
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