Android原生跳转到Flutter页面

1.启动Flutter页面 默认界面

startActivity(
                FlutterActivity.withNewEngine().build(activity!!)
            )

 2.启动Flutter指定的界面比如设置界面

Android 中

startActivity(
                FlutterActivity
                    .withNewEngine()
                   .initialRoute("/setting")
                    .build(activity!!))

 Flutter中 需要注册路由

 

 遇到的问题，启动Flutter页面比较缓慢，优化

思路：在Application中提前初始化FlutterEngine 进行缓存   从缓存中取FlutterEngine进行启动

fun registerEngine(routerName: String,context: Context) {
        val engine = FlutterEngine(context)
        engine.navigationChannel.setInitialRoute(routerName)
        engine.dartExecutor.executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault())
        FlutterEngineCache.getInstance().put(routerName,engine)
    }

 从缓存中获取

fun getEngine(routerName: String,context: Context) : Intent {
        return FlutterActivity.withCachedEngine(routerName).build(context)
    }

 封装后：

package com.bestarschool.parent.util

import android.content.Context
import android.content.Intent
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.embedding.engine.FlutterEngineCache
import io.flutter.embedding.engine.dart.DartExecutor


object EngineManager {
    // 保存
    fun registerEngine(routerName: String,context: Context) {
        val engine = FlutterEngine(context)
        engine.navigationChannel.setInitialRoute(routerName)
        engine.dartExecutor.executeDartEntrypoint(DartExecutor.DartEntrypoint.createDefault())
        FlutterEngineCache.getInstance().put(routerName,engine)
    }

    // 获取intent
    fun getEngine(routerName: String,context: Context) : Intent {
        return FlutterActivity.withCachedEngine(routerName).build(context)
    }
}

 调用启动Flutter   RouteManager.setting  为路由名称  /setting

startActivity(
                EngineManager.getEngine(RouteManager.setting,activity!!)
            )

问题：新启动的页面没有返回上一页按钮，但是项目中需要有返回按钮如何解决：思路如下

Scaffold(
      appBar: AppBar(
        leading: IconButton(
            onPressed: () {
              // 退出 flutter 页面
              Navigator.pop();
            },
            icon: Icon(Icons.arrow_back)),
        title: Text("设置页面"),
        centerTitle: true,
      )

 这样写的问题 退出后停留在黑屏界面并没有完全退出，解决方案，调用  SystemNavigator.pop();

Scaffold(
      appBar: AppBar(
        leading: IconButton(
            onPressed: () {
              // 退出所有 flutter 页面
              SystemNavigator.pop();
            },
            icon: Icon(Icons.arrow_back)),
        title: Text("设置页面"),
        centerTitle: true,
      )

 点击返回按钮能正常退出了，但是点击手机的返回键仍不能完全退出flutter页面，解决办法  ,去掉home  是我自己用法错误