add test_flutter_message_channel

test_flutter_message_channel/.gitignore

+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

test_flutter_message_channel/.metadata

+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "7f20e5d18ce4cb80c621533090a7c5113f5bdc52"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 7f20e5d18ce4cb80c621533090a7c5113f5bdc52
+      base_revision: 7f20e5d18ce4cb80c621533090a7c5113f5bdc52
+    - platform: android
+      create_revision: 7f20e5d18ce4cb80c621533090a7c5113f5bdc52
+      base_revision: 7f20e5d18ce4cb80c621533090a7c5113f5bdc52
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

test_flutter_message_channel/README.md

+# test_flutter_message_channel
+
+## 测试 Flutter 读写原生对象时间消耗
+
+- 读取测试
+
+1. 在 原生 层创建一个联系人列表，每项有2个字段，类型为 string
+2. 从 flutter 层发送消息到原生层，原生层将数据列表序列化为字符串，然后返回
+3. 在 flutter 层将字符串还原为 dart 数据结构
+4. 循环操作 1000 次并记录总耗时
+
+
+- 读取并写回原生层
+
+1. 在 原生 层创建一个联系人列表，每项有2个字段，类型为 string
+2. 从 flutter 层发送消息到原生层，原生层将数据列表序列化为字符串，然后返回
+3. 在 flutter 层将字符串还原为 dart 数据结构, 然后在序列化为字符串发送到原生层
+4. 在 原生 层将字符串还原为对应的数据结构
+5. 循环操作 1000 次并记录总耗时

test_flutter_message_channel/analysis_options.yaml

+# This file configures the analyzer, which statically analyzes Dart code to
+# check for errors, warnings, and lints.
+#
+# The issues identified by the analyzer are surfaced in the UI of Dart-enabled
+# IDEs (https://dart.dev/tools#ides-and-editors). The analyzer can also be
+# invoked from the command line by running `flutter analyze`.
+
+# The following line activates a set of recommended lints for Flutter apps,
+# packages, and plugins designed to encourage good coding practices.
+include: package:flutter_lints/flutter.yaml
+
+linter:
+  # The lint rules applied to this project can be customized in the
+  # section below to disable rules from the `package:flutter_lints/flutter.yaml`
+  # included above or to enable additional rules. A list of all available lints
+  # and their documentation is published at https://dart.dev/lints.
+  #
+  # Instead of disabling a lint rule for the entire project in the
+  # section below, it can also be suppressed for a single line of code
+  # or a specific dart file by using the `// ignore: name_of_lint` and
+  # `// ignore_for_file: name_of_lint` syntax on the line or in the file
+  # producing the lint.
+  rules:
+    # avoid_print: false  # Uncomment to disable the `avoid_print` rule
+    # prefer_single_quotes: true  # Uncomment to enable the `prefer_single_quotes` rule
+
+# Additional information about this file can be found at
+# https://dart.dev/guides/language/analysis-options

test_flutter_message_channel/android/.gitignore

+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/docs/deployment/android#reference-the-keystore-from-the-app
+key.properties
+**/*.keystore
+**/*.jks

test_flutter_message_channel/android/app/build.gradle

+plugins {
+    id "com.android.application"
+    id "kotlin-android"
+    id "dev.flutter.flutter-gradle-plugin"
+}
+
+def localProperties = new Properties()
+def localPropertiesFile = rootProject.file('local.properties')
+if (localPropertiesFile.exists()) {
+    localPropertiesFile.withReader('UTF-8') { reader ->
+        localProperties.load(reader)
+    }
+}
+
+def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
+if (flutterVersionCode == null) {
+    flutterVersionCode = '1'
+}
+
+def flutterVersionName = localProperties.getProperty('flutter.versionName')
+if (flutterVersionName == null) {
+    flutterVersionName = '1.0'
+}
+
+android {
+    namespace "com.example.test_flutter_message_channel"
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+
+    sourceSets {
+        main.java.srcDirs += 'src/main/kotlin'
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId "com.example.test_flutter_message_channel"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-gradle-build-configuration.
+        minSdkVersion flutter.minSdkVersion
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutterVersionCode.toInteger()
+        versionName flutterVersionName
+
+        ndk {
+            abiFilters 'arm64-v8a'
+        }
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig signingConfigs.debug
+        }
+    }
+}
+
+flutter {
+    source '../..'
+}
+
+dependencies {
+    implementation 'com.google.code.gson:gson:2.8.9'
+}

test_flutter_message_channel/android/app/src/debug/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

test_flutter_message_channel/android/app/src/main/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="test_flutter_message_channel"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+</manifest>

test_flutter_message_channel/android/app/src/main/kotlin/com/example/test_flutter_message_channel/MainActivity.kt

+package com.example.test_flutter_message_channel
+
+import android.content.Context
+import android.hardware.Sensor
+import android.hardware.SensorManager
+import com.google.gson.Gson
+import com.google.gson.reflect.TypeToken
+import com.google.gson.annotations.SerializedName
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.*
+import java.io.InputStream
+import java.nio.ByteBuffer
+import kotlin.math.log
+
+class MainActivity: FlutterActivity() {
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        // 0.1k
+        var contactModel100 = ContactModel()
+        // 1k
+        var contactModel1000 = ContactModel()
+
+        for (i in 1..3) {
+            contactModel100.add(ContactDetails("name", "phone"));
+        }
+
+        for (i in 1..32) {
+            contactModel1000.add(ContactDetails("name", "phone"));
+        }
+
+        MethodChannel(flutterEngine.dartExecutor, "methodChannelDemo")
+            .setMethodCallHandler { call, result ->
+                when (call.method) {
+                    "setContacts100" -> {
+                        val contacts: String? = call.argument<String>("contacts");
+                        // println(contacts!!.length.toString());
+                        contactModel100.fromJson(contacts!!);
+                        result.success(1);
+                    }
+                    "setContacts1000" -> {
+                        val contacts: String? = call.argument<String>("contacts");
+                        // println(contacts.length); // 1025
+                        contactModel1000.fromJson(contacts!!);
+                        result.success(1);
+                    }
+                    else -> result.notImplemented()
+                }
+            }
+
+        BasicMessageChannel(flutterEngine.dartExecutor, "jsonMessageCodecDemo", JSONMessageCodec.INSTANCE)
+            .setMessageHandler { message, reply ->
+                if (message == "getContact100") {
+                    reply.reply(contactModel100.toJson())
+                } else if (message == "getContact1000") {
+                    reply.reply(contactModel1000.toJson())
+                } else {
+                    reply.reply(null)
+                }
+            }
+    }
+}
+
+open class ContactDetails(@SerializedName("name") open var name: String, @SerializedName("phone") open var phone: String) {}
+
+open class ContactModel {
+    open var contacts: MutableCollection<ContactDetails> = mutableListOf();
+
+    private val gson = Gson();
+
+    open fun add(contact: ContactDetails) {
+        contacts.add(contact);
+    }
+
+    fun fromJson(jsonString: String) {
+        contacts = gson.fromJson(jsonString, object : TypeToken<MutableCollection<ContactDetails>>() {}.type);
+    }
+
+    fun toJson() : String {
+        return gson.toJson(mapOf("contacts" to contacts));
+    }
+}

test_flutter_message_channel/android/app/src/main/res/drawable-v21/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

test_flutter_message_channel/android/app/src/main/res/drawable/launch_background.xml

+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

test_flutter_message_channel/android/app/src/main/res/values-night/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

test_flutter_message_channel/android/app/src/main/res/values/styles.xml

+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

test_flutter_message_channel/android/app/src/profile/AndroidManifest.xml

+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

test_flutter_message_channel/android/build.gradle

+buildscript {
+    ext.kotlin_version = '1.7.10'
+    repositories {
+        google()
+        mavenCentral()
+    }
+
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
+    }
+}
+
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+rootProject.buildDir = '../build'
+subprojects {
+    project.buildDir = "${rootProject.buildDir}/${project.name}"
+}
+subprojects {
+    project.evaluationDependsOn(':app')
+}
+
+tasks.register("clean", Delete) {
+    delete rootProject.buildDir
+}

test_flutter_message_channel/android/gradle.properties

+org.gradle.jvmargs=-Xmx4G
+android.useAndroidX=true
+android.enableJetifier=true

test_flutter_message_channel/android/gradle/wrapper/gradle-wrapper.properties

+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.5-all.zip

test_flutter_message_channel/android/settings.gradle

+pluginManagement {
+    def flutterSdkPath = {
+        def properties = new Properties()
+        file("local.properties").withInputStream { properties.load(it) }
+        def flutterSdkPath = properties.getProperty("flutter.sdk")
+        assert flutterSdkPath != null, "flutter.sdk not set in local.properties"
+        return flutterSdkPath
+    }
+    settings.ext.flutterSdkPath = flutterSdkPath()
+
+    includeBuild("${settings.ext.flutterSdkPath}/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+
+    plugins {
+        id "dev.flutter.flutter-gradle-plugin" version "1.0.0" apply false
+    }
+}
+
+plugins {
+    id "dev.flutter.flutter-plugin-loader" version "1.0.0"
+    id "com.android.application" version "7.3.0" apply false
+}
+
+include ":app"

test_flutter_message_channel/lib/main.dart

+import 'dart:convert';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+void main() {
+  runApp(const MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  const MyApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'test flutter message channel',
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
+        useMaterial3: true,
+      ),
+      home: const ContactPage(),
+    );
+  }
+}
+
+class ContactDetails {
+  ContactDetails({
+    required this.name,
+    required this.phone,
+  });
+
+  final String name;
+  final String phone;
+
+  factory ContactDetails.fromMap(Map<String, dynamic> map) => ContactDetails(
+    name: map['name'] as String,
+    phone: map['phone'] as String,
+  );
+
+  Map<String, String> toJson() => <String, String>{
+    'name': name,
+    'phone': phone,
+  };
+}
+
+class ContactListModel {
+  ContactListModel({
+    required this.contactList,
+  });
+
+  final List<ContactDetails> contactList;
+
+  factory ContactListModel.fromJson(String jsonString) {
+    final jsonData = json.decode(jsonString) as Map<String, dynamic>;
+    return ContactListModel(
+      contactList: List.from((jsonData['contacts'] as List).map<ContactDetails>(
+            (dynamic contactDetailsMap) => ContactDetails.fromMap(
+          contactDetailsMap as Map<String, dynamic>,
+        ),
+      )),
+    );
+  }
+
+  String toJson() {
+    String json = jsonEncode(contactList.map((i) => i.toJson()).toList()).toString();
+    return json;
+  }
+}
+
+class ContactsMessageChannel {
+  static const MethodChannel _methodChannel = MethodChannel('methodChannelDemo');
+
+  static const _jsonMessageCodecChannel =
+  BasicMessageChannel<dynamic>('jsonMessageCodecDemo', JSONMessageCodec());
+
+  static void addContactDetails(ContactDetails contactDetails) {
+    _jsonMessageCodecChannel.send(contactDetails.toJson());
+  }
+
+  static Future<ContactListModel> getContacts(String type) async {
+    final reply = await _jsonMessageCodecChannel.send('getContact$type');
+    if (reply == null) {
+      throw PlatformException(
+        code: 'INVALID',
+        message: 'Failed to get contact',
+        details: null,
+      );
+    } else {
+      return ContactListModel.fromJson(reply);
+    }
+  }
+
+  static Future<int> setContacts(json, String type) async {
+    final result = await _methodChannel .invokeMethod<int>('setContacts$type', {'contacts': json});
+    return result!;
+  }
+}
+
+class ContactPage extends StatefulWidget {
+  const ContactPage({super.key});
+
+  @override
+  State<ContactPage> createState() => _ContactPageState();
+}
+
+class _ContactPageState extends State<ContactPage> {
+  static const int invokeCount = 1000;
+
+  ContactListModel contactListModel = ContactListModel(contactList: []);
+
+  String dataType = '1000';
+  String dataTypeText = '1';
+
+  int getCount = 0;
+  int getSetCount = 0;
+  final List<String> timeList = [];
+
+  _setDataType() async {
+    setState(() {
+      if (dataType == '1000') {
+        dataType = '100';
+        dataTypeText = '0.1';
+      } else {
+        dataType = '1000';
+        dataTypeText = '1';
+      }
+      //dataTypeText = (dataType / 1000).toString();
+    });
+  }
+
+  Future<void> _getContactData() async {
+    // 记录开始时间
+    var startDateTime = DateTime.now();
+
+    // 循环调用 1000 次
+    for (int i = 0; i < invokeCount; i++) {
+      contactListModel = await ContactsMessageChannel.getContacts(dataType);
+    }
+
+    // 记录结束时间
+    var endDateTime = DateTime.now();
+    // 计算消耗的毫秒数
+    var totalMilliseconds = endDateTime
+        .difference(startDateTime)
+        .inMilliseconds;
+
+    getCount++;
+
+    timeList.add("第 $getCount 次读取总耗时=$totalMilliseconds 毫秒");
+
+    // 更新界面
+    setState(() {});
+  }
+
+  Future<void> _getSetContactData() async {
+    // 记录开始时间
+    var startDateTime = DateTime.now();
+
+    // 先从Java层读取 1KB 联系人，然后序列为JSON后在Java层还原
+    for (int i = 0; i < invokeCount; i++) {
+      contactListModel = await ContactsMessageChannel.getContacts(dataType);
+      await ContactsMessageChannel.setContacts(contactListModel.toJson(), dataType);
+    }
+
+    // 记录结束时间
+    var endDateTime = DateTime.now();
+    // 计算消耗的毫秒数
+    var totalMilliseconds = endDateTime
+        .difference(startDateTime)
+        .inMilliseconds;
+
+    getSetCount++;
+
+    timeList.add("第 $getSetCount 次读取+写入总耗时=$totalMilliseconds 毫秒");
+
+    setState(() {});
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme
+            .of(context)
+            .colorScheme
+            .inversePrimary,
+        title: const Text('test flutter message channel'),
+      ),
+      body: Flex(
+        direction: Axis.horizontal,
+        crossAxisAlignment: CrossAxisAlignment.start,
+        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        children: <Widget>[
+          Flexible(
+            flex: 1,
+            child: BuildTimeListWidget(timeList),
+          ),
+          Flexible(
+            flex: 1,
+            child: contactListModel.contactList.isEmpty
+                ? const Center(child: Text('no data'))
+                : BuildContactListWidget(contactListModel.contactList),
+          ),
+          Flexible(
+            flex: 1,
+            child: ListView(
+              children: <Widget>[
+                Container(height: 10),
+                GestureDetector(
+                  behavior: HitTestBehavior.opaque,
+                  child: Text('数据长度约 $dataTypeText KB'),
+                  onTap: () {
+                    _setDataType();
+                  },
+                ),
+                Container(height: 10),
+                const Text('循环执行 1000 次'),
+                Container(height: 15),
+                ElevatedButton(onPressed: _getContactData,
+                  child: const Text('读取原生对象数据'),
+                ),
+                ElevatedButton(onPressed: _getSetContactData,
+                  child: const Text('读取并写回原生对象'),
+                ),
+              ],
+            ),
+          ),
+        ],
+      ), // This trailing comma makes auto-formatting nicer for build methods.
+    );
+  }
+}
+
+class BuildContactListWidget extends StatelessWidget {
+  final List<ContactDetails> contactList;
+
+  const BuildContactListWidget(this.contactList, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView.builder(
+      padding: const EdgeInsets.all(1),
+      itemCount: contactList.length,
+      itemBuilder: (context, index) {
+        return ListTile(
+          title: Text(contactList[index].name, style: const TextStyle(fontSize: 12),),
+          subtitle: Text(contactList[index].phone, style: const TextStyle(fontSize: 12),),
+        );
+      },
+    );
+  }
+}
+
+class BuildTimeListWidget extends StatelessWidget {
+  final List<String> timeList;
+
+  const BuildTimeListWidget(this.timeList, {super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView.builder(
+      padding: const EdgeInsets.all(2),
+      itemCount: timeList.length,
+      itemBuilder: (context, index) {
+        return ListTile(
+            title: Text(style: const TextStyle(fontSize: 12), timeList[index])
+        );
+      },
+    );
+  }
+}

test_flutter_message_channel/pubspec.lock

+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  async:
+    dependency: transitive
+    description:
+      name: async
+      sha256: "947bfcf187f74dbc5e146c9eb9c0f10c9f8b30743e341481c1e2ed3ecc18c20c"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.11.0"
+  boolean_selector:
+    dependency: transitive
+    description:
+      name: boolean_selector
+      sha256: "6cfb5af12253eaf2b368f07bacc5a80d1301a071c73360d746b7f2e32d762c66"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.1"
+  characters:
+    dependency: transitive
+    description:
+      name: characters
+      sha256: "04a925763edad70e8443c99234dc3328f442e811f1d8fd1a72f1c8ad0f69a605"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.0"
+  clock:
+    dependency: transitive
+    description:
+      name: clock
+      sha256: cb6d7f03e1de671e34607e909a7213e31d7752be4fb66a86d29fe1eb14bfb5cf
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.1.1"
+  collection:
+    dependency: transitive
+    description:
+      name: collection
+      sha256: ee67cb0715911d28db6bf4af1026078bd6f0128b07a5f66fb2ed94ec6783c09a
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.18.0"
+  cupertino_icons:
+    dependency: "direct main"
+    description:
+      name: cupertino_icons
+      sha256: d57953e10f9f8327ce64a508a355f0b1ec902193f66288e8cb5070e7c47eeb2d
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.0.6"
+  fake_async:
+    dependency: transitive
+    description:
+      name: fake_async
+      sha256: "511392330127add0b769b75a987850d136345d9227c6b94c96a04cf4a391bf78"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.3.1"
+  flutter:
+    dependency: "direct main"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  flutter_lints:
+    dependency: "direct dev"
+    description:
+      name: flutter_lints
+      sha256: a25a15ebbdfc33ab1cd26c63a6ee519df92338a9c10f122adda92938253bef04
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.0.3"
+  flutter_test:
+    dependency: "direct dev"
+    description: flutter
+    source: sdk
+    version: "0.0.0"
+  lints:
+    dependency: transitive
+    description:
+      name: lints
+      sha256: "0a217c6c989d21039f1498c3ed9f3ed71b354e69873f13a8dfc3c9fe76f1b452"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.1"
+  matcher:
+    dependency: transitive
+    description:
+      name: matcher
+      sha256: "1803e76e6653768d64ed8ff2e1e67bea3ad4b923eb5c56a295c3e634bad5960e"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.12.16"
+  material_color_utilities:
+    dependency: transitive
+    description:
+      name: material_color_utilities
+      sha256: "9528f2f296073ff54cb9fee677df673ace1218163c3bc7628093e7eed5203d41"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.5.0"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      sha256: a6e590c838b18133bb482a2745ad77c5bb7715fb0451209e1a7567d416678b8e
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0"
+  path:
+    dependency: transitive
+    description:
+      name: path
+      sha256: "8829d8a55c13fc0e37127c29fedf290c102f4e40ae94ada574091fe0ff96c917"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.8.3"
+  sky_engine:
+    dependency: transitive
+    description: flutter
+    source: sdk
+    version: "0.0.99"
+  source_span:
+    dependency: transitive
+    description:
+      name: source_span
+      sha256: "53e943d4206a5e30df338fd4c6e7a077e02254531b138a15aec3bd143c1a8b3c"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.10.0"
+  stack_trace:
+    dependency: transitive
+    description:
+      name: stack_trace
+      sha256: "73713990125a6d93122541237550ee3352a2d84baad52d375a4cad2eb9b7ce0b"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.11.1"
+  stream_channel:
+    dependency: transitive
+    description:
+      name: stream_channel
+      sha256: ba2aa5d8cc609d96bbb2899c28934f9e1af5cddbd60a827822ea467161eb54e7
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.2"
+  string_scanner:
+    dependency: transitive
+    description:
+      name: string_scanner
+      sha256: "556692adab6cfa87322a115640c11f13cb77b3f076ddcc5d6ae3c20242bedcde"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.0"
+  term_glyph:
+    dependency: transitive
+    description:
+      name: term_glyph
+      sha256: a29248a84fbb7c79282b40b8c72a1209db169a2e0542bce341da992fe1bc7e84
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "1.2.1"
+  test_api:
+    dependency: transitive
+    description:
+      name: test_api
+      sha256: "5c2f730018264d276c20e4f1503fd1308dfbbae39ec8ee63c5236311ac06954b"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.6.1"
+  vector_math:
+    dependency: transitive
+    description:
+      name: vector_math
+      sha256: "80b3257d1492ce4d091729e3a67a60407d227c27241d6927be0130c98e741803"
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "2.1.4"
+  web:
+    dependency: transitive
+    description:
+      name: web
+      sha256: afe077240a270dcfd2aafe77602b4113645af95d0ad31128cc02bce5ac5d5152
+      url: "https://pub.flutter-io.cn"
+    source: hosted
+    version: "0.3.0"
+sdks:
+  dart: ">=3.2.1 <4.0.0"

test_flutter_message_channel/pubspec.yaml

+name: test_flutter_message_channel
+description: "A new Flutter project."
+# The following line prevents the package from being accidentally published to
+# pub.dev using `flutter pub publish`. This is preferred for private packages.
+publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+
+# The following defines the version and build number for your application.
+# A version number is three numbers separated by dots, like 1.2.43
+# followed by an optional build number separated by a +.
+# Both the version and the builder number may be overridden in flutter
+# build by specifying --build-name and --build-number, respectively.
+# In Android, build-name is used as versionName while build-number used as versionCode.
+# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
+# In iOS, build-name is used as CFBundleShortVersionString while build-number is used as CFBundleVersion.
+# Read more about iOS versioning at
+# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
+# In Windows, build-name is used as the major, minor, and patch parts
+# of the product and file versions while build-number is used as the build suffix.
+version: 1.0.0+1
+
+environment:
+  sdk: '>=3.2.1 <4.0.0'
+
+# Dependencies specify other packages that your package needs in order to work.
+# To automatically upgrade your package dependencies to the latest versions
+# consider running `flutter pub upgrade --major-versions`. Alternatively,
+# dependencies can be manually updated by changing the version numbers below to
+# the latest version available on pub.dev. To see which dependencies have newer
+# versions available, run `flutter pub outdated`.
+dependencies:
+  flutter:
+    sdk: flutter
+
+
+  # The following adds the Cupertino Icons font to your application.
+  # Use with the CupertinoIcons class for iOS style icons.
+  cupertino_icons: ^1.0.2
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+
+  # The "flutter_lints" package below contains a set of recommended lints to
+  # encourage good coding practices. The lint set provided by the package is
+  # activated in the `analysis_options.yaml` file located at the root of your
+  # package. See that file for information about deactivating specific lint
+  # rules and activating additional ones.
+  flutter_lints: ^2.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+
+  # The following line ensures that the Material Icons font is
+  # included with your application, so that you can use the icons in
+  # the material Icons class.
+  uses-material-design: true
+
+  # To add assets to your application, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/assets-and-images/#resolution-aware
+
+  # For details regarding adding assets from package dependencies, see
+  # https://flutter.dev/assets-and-images/#from-packages
+
+  # To add custom fonts to your application, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts from package dependencies,
+  # see https://flutter.dev/custom-fonts/#from-packages

test_flutter_message_channel/test/widget_test.dart

+// This is a basic Flutter widget test.
+//
+// To perform an interaction with a widget in your test, use the WidgetTester
+// utility in the flutter_test package. For example, you can send tap and scroll
+// gestures. You can also use WidgetTester to find child widgets in the widget
+// tree, read text, and verify that the values of widget properties are correct.
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+import 'package:test_flutter_message_channel/main.dart';
+
+void main() {
+  testWidgets('Counter increments smoke test', (WidgetTester tester) async {
+    // Build our app and trigger a frame.
+    await tester.pumpWidget(const MyApp());
+
+    // Verify that our counter starts at 0.
+    expect(find.text('0'), findsOneWidget);
+    expect(find.text('1'), findsNothing);
+
+    // Tap the '+' icon and trigger a frame.
+    await tester.tap(find.byIcon(Icons.add));
+    await tester.pump();
+
+    // Verify that our counter has incremented.
+    expect(find.text('0'), findsNothing);
+    expect(find.text('1'), findsOneWidget);
+  });
+}