【Flutter 混合开发】添加 Flutter 到 Android Fragment

使用新引擎创建 FlutterFragment

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val fragment = FlutterFragment.createDefault()
        supportFragmentManager
            .beginTransaction()
            .add(R.id.fragment_container,fragment)
            .commit()
    }
}

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/button"/>
    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="跳转"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>


</androidx.constraintlayout.widget.ConstraintLayout>

class MainActivity : AppCompatActivity() {
  override fun onPostResume() {
    super.onPostResume()
    flutterFragment!!.onPostResume()
  }

  override fun onNewIntent(@NonNull intent: Intent) {
    flutterFragment!!.onNewIntent(intent)
  }

  override fun onBackPressed() {
    flutterFragment!!.onBackPressed()
  }

  override fun onRequestPermissionsResult(
    requestCode: Int,permissions: Array<String?>,grantResults: IntArray
  ) {
    flutterFragment!!.onRequestPermissionsResult(
      requestCode,permissions,grantResults
    )
  }

  override fun onUserLeaveHint() {
    flutterFragment!!.onUserLeaveHint()
  }

  override fun onTrimMemory(level: Int) {
    super.onTrimMemory(level)
    flutterFragment!!.onTrimMemory(level)
  }
}

初始化新引擎路由

val fragment = FlutterFragment
    .withNewEngine()
    .initialRoute("one_page")
    .build<FlutterFragment>()

supportFragmentManager
    .beginTransaction()
    .add(R.id.fragment_container,fragment)
    .commit()

使用缓存引擎创建 FlutterFragment

class MyApplication : Application() {
    lateinit var flutterEngine: FlutterEngine

    override fun onCreate() {
        super.onCreate()
        flutterEngine = FlutterEngine(this)
        flutterEngine.dartExecutor.executeDartEntrypoint(
            DartExecutor.DartEntrypoint.createDefault()
        )
        FlutterEngineCache
            .getInstance()
            .put("engine_id",flutterEngine)


    }
}

val fragment = FlutterFragment
    .withCachedEngine("engine_id")
    .build<FlutterFragment>()

supportFragmentManager
    .beginTransaction()
    .add(R.id.fragment_container,fragment)
    .commit()

初始化缓存引擎路由

flutterEngine = FlutterEngine(this)

flutterEngine.navigationChannel.setInitialRoute("one_page")

flutterEngine.dartExecutor.executeDartEntrypoint(
    DartExecutor.DartEntrypoint.createDefault()
)
FlutterEngineCache
    .getInstance()
    .put("engine_id",flutterEngine)

更改入门点

val fragment = FlutterFragment
    .withNewEngine()
    .dartEntrypoint("newMain")
    .build<FlutterFragment>()

void main() => runApp(MyApp());

void newMain()=> runApp(NewApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',theme: ThemeData(

        primarySwatch: Colors.blue,),routes: {
        'one_page':(context){
          return OnePage();
        },'two_page':(context){
          return TwoPage();
        }
      },home: MyHomePage(title: 'Flutter Demo Home Page'),);
  }
}


class NewApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',home: TwoPage()
    );
  }
}

更改 FlutterFragment 的渲染模式

val fragment = FlutterFragment
    .withNewEngine()
    .renderMode(RenderMode.texture)
    .build<FlutterFragment>()

设置 FlutterFragment 透明

val fragment = FlutterFragment
    .withNewEngine()
    .transparencyMode(TransparencyMode.transparent)
    .build<FlutterFragment>()

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="跳转"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>


    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>


</androidx.constraintlayout.widget.ConstraintLayout>

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(
      title: Text(widget.title),backgroundColor: Colors.transparent,...
  );
}