Flutter与Android的混合开发（2）Activity如何跳转到Flutter页面，如何传值

时间 2019-11-06

标签 flutter android 混合开发 activity 如何转到页面栏目 Android 繁體版

原文原文链接

所有源码已上传githubphp

这部分的核心是须要你在Flutter程序的入口添加路由，Android会从Flutter设置的路由里找须要的页面做为View嵌入到Activity里，若是Flutter程序的入口同时配置了routes和home，则优先使用routes里配置的路由，当经过routes和home都没有找到路由的时候,才会从onUnknownRoute寻找。android

window.defaultRouteName就是Activity里传递的路由名称git

2. Activity如何跳转到Flutter页面

Activity跳转到Flutter其实就是在Activity里嵌入FlutterView而后再跳转到这个包含FlutterView的Activity，分别为下面4种方式github

在AppCompatActivity建立一个FlutterView，而后利用addContentView添加到当前AppCompatActivity中（下面的Page1Activity）
使用Fragment嵌入FlutterView（下面的Page2Activity）
使用FlutterActivity
使用FlutterFragmentActivity

方法3和方法4是最简单的一种显示FlutterView的方式，不须要本身建立FlutterView，由于内部已经帮你建立好了。也不须要建立包含FlutterView的Fragment。而且可让Flutter与FlutterActivity有交互功能。可是直接跳转FlutterFragmentActivity或FlutterActivity会有短暂的黑屏，优化方式在下面的代码里我也写了，和其余页面的方式优化方式是同样的，都是获取到FlutterView而后调用一下enableTransparentBackground()方法。方法3和方法4的惟一区别就是方法4继承的是v4包的FragmentActivity，而方法3继承的是普通的Activity。json

我写了点内容，可是仍是直接发完整代码看起来更方便更容易理解，因此就不写多余的文字了，直接把完整代码放出来app

Android部分的代码

MainActivity.kt

package com.liuhc.myapplication

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*
import org.jetbrains.anko.startActivity

/** * 描述:首页 * 做者:liuhc * 建立日期：2019-09-05 on 11:21 AM */
class MainActivity : AppCompatActivity() {

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

        //addContentView方式添加FlutterView
        page1.setOnClickListener {
            startActivity<Page1Activity>()
        }

        //普通Fragment方式添加FlutterView
        page2.setOnClickListener {
            startActivity<Page2Activity>()
        }

        //使用FlutterFragmentActivity
        page3.setOnClickListener {
            startActivity<PageFlutterFragmentActivity>()
        }

        //使用FlutterActivity
        page4.setOnClickListener {
            startActivity<PageFlutterActivity>()
        }

        //addContentView方式添加FlutterView并传递参数
        page1Param.setOnClickListener {
            startActivity<Page1ParamActivity>()
        }

        //解决debug模式下黑屏的另外一种方式
        noBlack.setOnClickListener {
            startActivity<DebugNoBlackActivity>()
        }
    }
}
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activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity">

    <Button android:id="@+id/page1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="addContentView方式添加FlutterView" android:textAllCaps="false" />

    <Button android:id="@+id/page2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="普通Fragment方式添加FlutterView" android:textAllCaps="false" />

    <Button android:id="@+id/page3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="使用FlutterFragmentActivity" android:textAllCaps="false" />

    <Button android:id="@+id/page4" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="使用FlutterActivity" android:textAllCaps="false" />

    <Button android:id="@+id/page1Param" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="addContentView方式添加FlutterView并传递参数" android:textAllCaps="false" />

    <Button android:id="@+id/noBlack" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="解决debug模式下黑屏的另外一种方式" android:textAllCaps="false" />


</LinearLayout>
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1. 在AppCompatActivity建立一个FlutterView

Page1Activity.kt

package com.liuhc.myapplication

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.widget.FrameLayout
import io.flutter.facade.Flutter

/** * 描述:addContentView方式添加FlutterView * 做者:liuhc * 建立日期：2019-09-05 on 11:21 AM */
class Page1Activity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //下面这个setContentView添加不添加的都不要紧
        //若是添加了,在debug模式下FlutterView显示有点慢因此会先显示activity_page1再显示FlutterView
        //而release模式下速度会很快,看不到activity_page1,会直接显示FlutterView
        setContentView(R.layout.activity_page1)
        //Activity嵌入FlutterView的方式1
        val flutterView = Flutter.createView(
            this,
            lifecycle,
            "page1"
        )
        //这句话的做用是在debug模式下去除启动Flutter页面的时候的黑屏
        flutterView.enableTransparentBackground()
        val flutterLayoutParams = FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT
        )
        flutterLayoutParams.leftMargin = 0
        //将下面的值设置为100就能够在FlutterView加载完之后仍然看到TextView
        flutterLayoutParams.topMargin = 0
        //由于flutterLayoutParams是占满全屏,因此调用addContentView会将flutterView放到R.layout.activity_page1上层
        //效果看起来就是flutterView替换了R.layout.activity_page1
        addContentView(flutterView, flutterLayoutParams)
        //可是若是上面直接使用setContentView就看不到过渡效果了,也就是看不到activity_page1也就看不到TextView显示的文字了
    }
}
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activity_page1.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/root" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".Page1Activity">

    <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="FlutterView正在加载中..." />
</RelativeLayout>
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2. 使用Fragment嵌入FlutterView

Page2Activity.kt

package com.liuhc.myapplication

import android.os.Bundle
import android.support.v4.app.Fragment
import android.support.v7.app.AppCompatActivity
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import io.flutter.facade.Flutter

/** * 描述:普通Fragment方式添加FlutterView * 做者:liuhc * 建立日期：2019-09-05 on 11:21 AM */
class Page2Activity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_page2)
        //Activity嵌入Flutter View的方式2
        val tx = supportFragmentManager.beginTransaction()
        //下面2种方式均可以,只不过方式2代码里调用了flutterView.enableTransparentBackground(),因此在debug模式下不会闪烁黑屏
        //方式1
        tx.replace(R.id.frameLayout, Flutter.createFragment("page2"))
        //方式2
        tx.replace(R.id.frameLayout, Page2Fragment())
        tx.commit()
    }

    class Page2Fragment : Fragment() {

        override fun onCreateView( inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle? ): View? {
            val flutterView = Flutter.createView(activity!!, lifecycle, "page2")
            //这句话的做用是在debug模式下去除启动Flutter页面的时候的黑屏
            flutterView.enableTransparentBackground()
            return flutterView
        }
    }
}
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activity_page2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".Page2Activity">

    <FrameLayout android:id="@+id/frameLayout" android:layout_width="match_parent" android:layout_height="match_parent" />
</LinearLayout>
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3. 使用FlutterFragmentActivity

package com.liuhc.myapplication

import android.os.Bundle
import android.util.Log
import io.flutter.app.FlutterFragmentActivity
import io.flutter.plugin.common.MethodChannel
import io.flutter.view.FlutterMain
import org.json.JSONObject

/** * 描述: * 做者:liuhc * 建立日期：2019-09-04 on 21:07 */
class PageFlutterFragmentActivity : FlutterFragmentActivity() {

    private lateinit var methodChannel: MethodChannel

    override fun onCreate(savedInstanceState: Bundle?) {
        //强烈建议放到Application里初始化,初始化一次便可,放这里只是举个例子
        FlutterMain.startInitialization(this)
        //intent的参数设置必须在super.onCreate以前,由于super.onCreate里会取这些参数
        intent.action = "android.intent.action.RUN"
        val channelName = "channelName_PageFlutterFragmentActivity"
        val androidMethod = "methodName_PageFlutterFragmentActivity"
        val jsonObject = JSONObject()
        jsonObject.put("path", "InvokeMethodPage")
        jsonObject.put("title", "PageFlutterFragmentActivity")
        jsonObject.put("channelName", channelName)
        jsonObject.put("androidMethod", androidMethod)
        intent.putExtra("route", jsonObject.toString())
        super.onCreate(savedInstanceState)
        //调用super.onCreate(savedInstanceState)以后flutterView才有值,
        //因此若是须要注册插件,则应该放到super.onCreate(savedInstanceState)代码以后才能够
        flutterView.enableTransparentBackground()
        //若是不须要平台交互的话,只须要上面的代码并在最后加上super.onCreate就能够了
        //这里this.registrarFor方法实际调用的是FlutterFragmentActivity里的delegate的registrarFor方法,
        //而delegate的registrarFor方法实际调用的是FlutterActivityDelegate里的flutterView.getPluginRegistry().registrarFor方法,
        //而FlutterActivityDelegate里的flutterView在调用了这里的super.onCreate(savedInstanceState)才有值,
        //因此若是须要注册插件,则应该放到super.onCreate(savedInstanceState)代码以后才能够
        val key = "PageFlutterFragmentActivity"
        if (this.hasPlugin(key)) return
        val registrar = this.registrarFor(key)
        methodChannel = MethodChannel(
            registrar.messenger(),
            channelName
        )
        methodChannel.setMethodCallHandler { methodCall, result ->
            if (methodCall.method == androidMethod) {
                Log.e("Android", "接收到了Flutter传递的参数:${methodCall.arguments}")
                result.success("$androidMethod ok")
                Log.e("Android", "主动调用Flutter的methodInvokeMethodPageState方法")
                methodChannel.invokeMethod("methodInvokeMethodPageState", "Android发送给Flutter的参数")
            }
        }
    }

}
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4. 使用FlutterActivity

package com.liuhc.myapplication

import android.os.Bundle
import android.util.Log
import io.flutter.app.FlutterActivity
import io.flutter.plugin.common.MethodChannel
import io.flutter.view.FlutterMain
import org.json.JSONObject

/** * 描述: * 做者:liuhc * 建立日期：2019-09-04 on 23:30 */
class PageFlutterActivity : FlutterActivity() {

    private lateinit var methodChannel: MethodChannel

    override fun onCreate(savedInstanceState: Bundle?) {
        //强烈建议放到Application里初始化,初始化一次便可,放这里只是举个例子
        FlutterMain.startInitialization(this)
        //intent的参数设置必须在super.onCreate以前,由于super.onCreate里会取这些参数
        intent.action = "android.intent.action.RUN"
        val channelName = "channelName_PageFlutterActivity"
        val androidMethod = "methodName_PageFlutterActivity"
        val jsonObject = JSONObject()
        jsonObject.put("path", "InvokeMethodPage")
        jsonObject.put("title", "PageFlutterActivity")
        jsonObject.put("channelName", channelName)
        jsonObject.put("androidMethod", androidMethod)
        intent.putExtra("route", jsonObject.toString())
        super.onCreate(savedInstanceState)
        //调用super.onCreate(savedInstanceState)以后flutterView才有值,
        //因此若是须要注册插件,则应该放到super.onCreate(savedInstanceState)代码以后才能够
        flutterView.enableTransparentBackground()
        //若是不须要平台交互的话,只须要上面的代码并在最后加上super.onCreate就能够了
        //这里this.registrarFor方法实际调用的是FlutterFragmentActivity里的delegate的registrarFor方法,
        //而delegate的registrarFor方法实际调用的是FlutterActivityDelegate里的flutterView.getPluginRegistry().registrarFor方法,
        //而FlutterActivityDelegate里的flutterView在调用了这里的super.onCreate(savedInstanceState)才有值,
        //因此若是须要注册插件,则应该放到super.onCreate(savedInstanceState)代码以后才能够
        val key = "PageFlutterActivity"
        if (this.hasPlugin(key)) return
        val registrar = this.registrarFor(key)
        methodChannel = MethodChannel(
            registrar.messenger(),
            channelName
        )
        methodChannel.setMethodCallHandler { methodCall, result ->
            if (methodCall.method == androidMethod) {
                Log.e("Android", "接收到了Flutter传递的参数:${methodCall.arguments}")
                result.success("$androidMethod ok")
                Log.e("Android", "主动调用Flutter的methodInvokeMethodPageState方法")
                methodChannel.invokeMethod("methodInvokeMethodPageState", "Android发送给Flutter的参数")
            }
        }
    }

}
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Android跳转FlutterView的时候传参

Page1ParamActivity.ktless

package com.liuhc.myapplication

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.ViewGroup
import android.widget.FrameLayout
import io.flutter.facade.Flutter
import org.json.JSONObject

/** * 描述:演示在跳转包含FlutterView的页面时如何同时传递参数 * 做者:liuhc * 建立日期：2019-09-03 */
class Page1ParamActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //下面这个setContentView添加不添加的都不要紧
        //若是添加了,在debug模式下FlutterView显示有点慢因此会先显示activity_page1再显示FlutterView
        //而release模式下速度会很快,看不到activity_page1,会直接显示FlutterView
        setContentView(R.layout.activity_page1)
        //Activity嵌入FlutterView的方式1
        val jsonObject = JSONObject()
        jsonObject.put("path", "page1Param")
        jsonObject.put("param", "我是参数")
        val flutterView = Flutter.createView(
            this,
            lifecycle,
            jsonObject.toString()
        )
        //这句话的做用是在debug模式下去除启动Flutter页面的时候的黑屏
        flutterView.enableTransparentBackground()
        val flutterLayoutParams = FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT
        )
        flutterLayoutParams.leftMargin = 0
        //将下面的值设置为100就能够在FlutterView加载完之后仍然看到TextView
        flutterLayoutParams.topMargin = 0
        //由于flutterLayoutParams是占满全屏,因此调用addContentView会将flutterView放到R.layout.activity_page1上层
        //效果看起来就是flutterView替换了R.layout.activity_page1
        addContentView(flutterView, flutterLayoutParams)
        //可是若是上面直接使用setContentView就看不到过渡效果了,也就是看不到activity_page1也就看不到TextView显示的文字了
    }
}
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解决黑屏的另外一种方式

DebugNoBlackActivity.kt

package com.liuhc.myapplication

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.view.View
import android.view.ViewGroup
import android.widget.FrameLayout
import io.flutter.facade.Flutter
import org.jetbrains.anko.find

/** * 描述:在debug模式下,直接跳转到使用FlutterView的Activity的时候会有黑屏, * 若是想处理这种状况能够直接调用flutterView.enableTransparentBackground(),参考Page1Activity * 这里提供另外一种解决方式 * * 可是没什么必要,由于release模式下是没有这种问题的 * * 这里要注意隐藏显示window.decorView是不能够的,必须隐藏显示R.layout.xxx里将要包含FlutterView的ViewGroup * * 做者:liuhc * 建立日期：2019-09-03 */
class DebugNoBlackActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //先调用setContentView设置一个layout
        setContentView(R.layout.activity_debug_no_black)
        //Activity嵌入FlutterView的方式1
        val flutterView = Flutter.createView(
            this,
            lifecycle,
            "page1"
        )
        val flutterLayoutParams = FrameLayout.LayoutParams(
            ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT
        )
        flutterLayoutParams.leftMargin = 0
        flutterLayoutParams.topMargin = 0
        //1.取出setContentView里将要添加FlutterView的ViewGroup
        val flutterViewViewGroup = find<ViewGroup>(R.id.flutterViewViewGroup)
        val root = find<ViewGroup>(R.id.root)
        val tipTextView = find<View>(R.id.tipTextView)
        //2.添加FlutterView
        flutterViewViewGroup.addView(flutterView, flutterLayoutParams)
        //3.在xml或者调用代码隐藏包含FlutterView的ViewGroup,由于我在xml隐藏了因此下面的方法就不须要调用了
        //flutterViewViewGroup.visibility = View.INVISIBLE
        //4.当FlutterView绘制了第一帧之后再显示,就解决了debug模式下的黑屏问题
        flutterView.addFirstFrameListener {
            //删除过渡TextView
            root.removeView(tipTextView)
            flutterViewViewGroup.visibility = View.VISIBLE
        }
    }
}
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activity_debug_no_black.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/root" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".Page1Activity">

    <FrameLayout android:id="@+id/flutterViewViewGroup" android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="invisible" />

    <TextView android:id="@+id/tipTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:text="FlutterView正在加载中..." />
</RelativeLayout>
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若是你直接运行release的版本，跳转到包含FlutterView的页面是没问题的，可是大部分时候咱们运行的是debug版本，这时候你会发现跳转到包含FlutterView的页面的时候屏幕会黑屏闪烁一下，实际上是不用处理的，由于debug和release模式的编译方式不同，release是没有这个问题的，可是本着刨根问底的态度，咱们能够用DebugNoBlackActivity.kt的方式来解决async

Dart部分代码

main.dart

import 'dart:convert';
import 'dart:ui';

import 'package:flutter/material.dart';

import 'invoke_method_page.dart';
import 'my_home_page.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,
      ),
      //方式1
      home: _getWidgetByRoute(window.defaultRouteName),
      //方式2 若是route相同,优先匹配routes而不是home
      routes: <String, WidgetBuilder>{
        "page1": (context) => MyHomePage(
              title: "匹配到了page1",
              message: "经过routes变量",
            ),
        "page2": (context) => MyHomePage(
              title: "匹配到了page2",
              message: "经过routes变量",
            ),
        "page3": (context) => MyHomePage(
              title: "匹配到了page3",
              message: "经过routes变量",
            ),
      },
      //当经过routes和home的返回值都为null的话,才会从onUnknownRoute寻找
      onUnknownRoute: (RouteSettings settings) {
        return new PageRouteBuilder(pageBuilder: (BuildContext context, _, __) {
          //这里为返回的Widget
          return MyHomePage(
            title: "没有匹配到",
            message: "经过onUnknownRoute变量",
          );
        });
      },
    );
  }
}

//若是要接收平台层发送的参数,除了使用Channel之外(这种方式不是正常的方式,强烈不推荐),就只能经过window.defaultRouteName了,
//由于routes的route只能提早定义好,没法动态判断
Widget _getWidgetByRoute(String jsonStr) {
  print("json=$jsonStr");
  String _route;
  Map<String, dynamic> jsonMap;
  try {
    jsonMap = json.decode(jsonStr);
    _route = jsonMap["path"];
  } catch (e) {
    print(e);
    _route = jsonStr;
  }
  switch (_route) {
    //接收到了匹配的规则，跳转到flutter指定页面
    case 'page1':
      return MyHomePage(
        title: "匹配到了page1",
        message: "经过home变量",
      );
    case 'page1Param':
      return MyHomePage(
        title: "匹配到了page1Param",
        message: jsonMap["param"],
      );
    case "InvokeMethodPage":
      return InvokeMethodPage(
        title: jsonMap["title"],
        channelName: jsonMap["channelName"],
        androidMethod: jsonMap["androidMethod"],
      );
    default:
      return MyHomePage(
        title: "没有匹配到",
        message: "经过home变量",
      );
  }
}
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invoke_method_page.dartide

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class InvokeMethodPage extends StatefulWidget {
  final String _title;
  final String _channelName;
  final String _androidMethod;

  InvokeMethodPage({
    @required String title,
    @required String channelName,
    @required String androidMethod,
  })  : this._title = title,
        this._channelName = channelName,
        this._androidMethod = androidMethod;

  @override
  _InvokeMethodPageState createState() => _InvokeMethodPageState();
}

class _InvokeMethodPageState extends State<InvokeMethodPage> {
  MethodChannel _methodChannel;

  @override
  void initState() {
    _methodChannel = MethodChannel(widget._channelName);
    _methodChannel.setMethodCallHandler((methodCall) {
      Future future = Future(() {
        if (methodCall.method == "methodInvokeMethodPageState") {
          print("接收到了Android的主动调用,参数为:${methodCall.arguments}");
        }
      });
      return future;
    });
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget._title),
      ),
      body: RaisedButton(
        onPressed: () async {
          print("主动调用Android的方法${widget._androidMethod}");
          var result = await _methodChannel.invokeMethod(
            widget._androidMethod,
            "我是来自Flutter的参数",
          );
          print("接收到了调用Android方法的返回值:$result");
        },
        child: Text("我是Flutter控件,点击发送参数到Android"),
      ),
    );
  }
}
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my_home_page.dartpost

import 'package:flutter/material.dart';

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title, this.message}) : super(key: key);

  final String title;
  final String message;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text(widget.title),
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[
              Text(
                widget.message,
              ),
              Text(
                'You have pushed the button this many times:',
              ),
              Text(
                '$_counter',
                style: Theme.of(context).textTheme.display1,
              ),
            ],
          ),
        ),
        floatingActionButton: FloatingActionButton(
          onPressed: _incrementCounter,
          tooltip: 'Increment',
          child: Icon(Icons.add),
        ));
  }
}
复制代码

到此，本章结束，这章介绍了如何在Android里嵌入FlutterView并跳转，还介绍了如何传递参数到FlutterView，但愿对你们有帮助。

运行Android项目，点击各个页面里的+号，数字会递增，说明刷新页面正常

欢迎加入Flutter开发群457664582，点击加入，你们一块儿学习讨论