【Flutter 混合开发】添加 Flutter 到 Android Activity

创建 Flutter Module

启动页加载 Flutter

package com.flutter.androidflutter

import io.flutter.embedding.android.FlutterActivity

class MainActivity : FlutterActivity()

跳转到 Flutter 页面

package com.flutter.androidflutter

import android.content.Intent
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import io.flutter.embedding.android.FlutterActivity
import kotlinx.android.synthetic.main.activity_main.*

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        button.setOnClickListener {
            startActivity(Intent(this,SecondFlutterActivity::class.java))
        }
    }
}

package com.flutter.androidflutter

import io.flutter.embedding.android.FlutterActivity

class SecondFlutterActivity:FlutterActivity() 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.flutter.androidflutter">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        ...
        <activity android:name=".SecondFlutterActivity"/>
    </application>

</manifest>

startActivity(Intent(this,FlutterActivity::class.java))

startActivity(FlutterActivity.createDefaultIntent(this))

<activity android:name="io.flutter.embedding.android.FlutterActivity"/>

class OnePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),body: Center(
        child: Text('这是 One 页面'),),);
  }
}

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 MainActivity : AppCompatActivity() {


    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        button.setOnClickListener {
            startActivity(
                FlutterActivity
                    .withNewEngine()
                    .initialRoute("one_page")
                    .build(this)
            )
        }
    }
}

引擎缓存

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)
    }

}

startActivity(
    FlutterActivity
        .withCachedEngine("engine_id")
        .build(this)
)

flutterEngine.destroy()

flutterEngine = FlutterEngine(this)

flutterEngine.navigationChannel.setInitialRoute("one_page")

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