mksz583-基于Flutter3.x实战跨平台短视频App混合开发[完结]
flutter
flutter
发布日期:   2023-10-06
文章字数:   1.8k
阅读时长:   9 分
阅读次数:  

{1}–第1章课程介绍与学习指南


{2}–第2章Flutter整体介绍

2-1Flutter技术发展概览

2-2Flutter技术发展概览

2-3Flutter技术发展概览

2-4Flutter的整体框架结构介绍

2-5为什么选择Dart语言

2-6Dart语言特性

2-7Dart的线程管理及框架

2-8Dart的异步编程

await修饰的代码会等待,async修饰的代码会直接执行不阻塞

微任务队列尽量不用,让它去进行内核工作,我们的任务放到事件队列

2-9工程结构


2-10布局方式及差异



2-11Flutter技术发展概览

{3}–第3章开发工具安装及环境搭建

{4}–第4章Flutter实现混合式开发

4-1Flutter混合开发 本章导学

4-2混合开发技术简介

4-3混合开发项目管理方式

4-4Flutter工程模式

4-5Flutter工程创建及项目运行

4-6BasicMessageChannel基础消息通道（一）

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData( 
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

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

  String? _message;

  static const _channel = BasicMessageChannel("msgChan", StringCodec());

  @override
  void initState() {
    super.initState();

    // 通过BasicMessageChannel注册一个接收回调,并返回消息
    _channel.setMessageHandler((message) async {
      print('receive message: $message');
      setState(() {
        _message = message;
      });
      return 'ACK from dart';
    });
  }

  Future<void> _sendMessage() async {
    String? msg = await _channel.send('Hello from dart');
    print('Send msg: $msg');
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              '$_message',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _sendMessage,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

4-7BasicMessageChannel基础消息通道(二)

package com.example.mc

import android.os.Handler
import android.os.Looper
import android.util.Log
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.BasicMessageChannel
import io.flutter.plugin.common.StringCodec
import java.util.logging.Logger

class MainActivity : FlutterActivity() {
    private val TAG = "MainActivity"
    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)

        // 初始化BasicMessageChannel传入名称,要和dart里定义的名称一致
        val channel = BasicMessageChannel(
            flutterEngine.dartExecutor.binaryMessenger, "msgChan", StringCodec.INSTANCE
        );

        // 接收回调,返回ACK
        // 最后一个方法直接省略
        channel.setMessageHandler { message, reply ->
            Log.d(TAG, "configureFlutterEngine: Android receive message: " + message)
            reply.reply("ACK from Android")

            // 延迟1秒发送
            Handler(Looper.getMainLooper()).postDelayed({
                // 发送消息给dart
                channel.send("hello from android")
            }, 1000)
        }

    }
}

4-8EventChannel事件通道

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData( 
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

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

  String? _message;

  // 1.创建channel
  // static const _channel = BasicMessageChannel("msgChan", StringCodec());
  static const _channel = EventChannel("eventChan");

  @override
  void initState() {
    super.initState();

    // 2.通过channel实例注册
    // 通过BasicMessageChannel注册一个接收回调,并返回消息
    // _channel.setMessageHandler((message) async {
    //   print('receive message: $message');
    //   setState(() {
    //     _message = message;
    //   });
    //   return 'ACK from dart';
    // });
    _channel.receiveBroadcastStream().listen((event) {
      print('receive event: $event');
      setState(() {
        _message = event;
      });
    }, onError: (error) {
      print('receive error: $error');
    }, cancelOnError: true); // err时取消监听
  }

  // Future<void> _sendMessage() async {
  //   String? msg = await _channel.send('Hello from dart');
  //   print('Send msg: $msg');
  // }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'wait for message',
            ),
            Text(
              '$_message',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        // onPressed: _sendMessage,
        onPressed: () {},
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }
}

package com.example.mc

import android.os.Handler
import android.os.Looper
import android.util.Log
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.EventChannel

class MainActivity : FlutterActivity() {
    private val TAG = "MainActivity"
    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)

        // 初始化BasicMessageChannel传入名称,要和dart里定义的名称一致
//        val channel = BasicMessageChannel(
//            flutterEngine.dartExecutor.binaryMessenger, "msgChan", StringCodec.INSTANCE
//        );
        val channel = EventChannel(
            flutterEngine.dartExecutor.binaryMessenger, "eventChan"
        )

        // 接收回调,返回ACK
        // kt语法糖: 最后一个方法直接省略
//        channel.setMessageHandler { message, reply ->
//            Log.d(TAG, "configureFlutterEngine: Android receive message: " + message)
//            reply.reply("ACK from Android")
//
//            // 延迟1秒发送
//            Handler(Looper.getMainLooper()).postDelayed({
//                // 发送消息给dart
//                channel.send("hello from android")
//            }, 1000)
//        }
        // 设置事件流的handler
        channel.setStreamHandler(object : EventChannel.StreamHandler {
            override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
                Log.d(TAG, "onListen: eventChan")

                Handler(Looper.getMainLooper()).postDelayed({
                    Log.d(TAG, "onListen: send ADK from android")

                    events?.success("ACK from android")
                }, 1000)
            }

            override fun onCancel(arguments: Any?) {
                Log.d(TAG, "onCancel: eventChan cancel")
            }
        })
    }
}

4-9混合开发的关键MethodChannel方法通道（一）

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

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  // ...
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

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

  String? _message;

  // 1.创建channel
  // static const _channel = BasicMessageChannel("msgChan", StringCodec());
  // static const _channel = EventChannel("eventChan");
  static const _channel = MethodChannel('methodChan');

  @override
 void  initState()   {
    super.initState();

    getFlutterInfo();
    // 2.通过channel实例注册
    // 通过BasicMessageChannel注册一个接收回调,并返回消息
    // _channel.setMessageHandler((message) async {
    //   print('receive message: $message');
    //   setState(() {
    //     _message = message;
    //   });
    //   return 'ACK from dart';
    // });

    // _channel.receiveBroadcastStream().listen((event) {
    //   print('receive event: $event');
    //   setState(() {
    //     _message = event;
    //   });
    // }, onError: (error) {
    //   print('receive error: $error');
    // }, cancelOnError: true); // err时取消监听
  }

  // Future<void> _sendMessage() async {
  //   String? msg = await _channel.send('Hello from dart');
  //   print('Send msg: $msg');
  // }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme
            .of(context)
            .colorScheme
            .inversePrimary,
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'wait for message',
            ),
            Text(
              '$_message',
              style: Theme
                  .of(context)
                  .textTheme
                  .headlineMedium,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        // onPressed: _sendMessage,
        onPressed: () {},
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ),
    );
  }

  Future<void> getFlutterInfo () async {
    final Map<String, dynamic> map = {
      'name': 'flutter',
      'version': "3",
      'language': 'dart',
      'android_api': 32
    };

    String res =  await _channel.invokeMethod('getFlutterInfo', map);
    print('method invoke res: $res');
  }
}

package com.example.mc

import android.util.Log
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.EventChannel
import io.flutter.plugin.common.MethodCall
import io.flutter.plugin.common.MethodChannel

class MainActivity : FlutterActivity() {
    companion object {
        val METHOD_NAME = "getFlutterInfo"
    }

    private val TAG = "MainActivity"
    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
        super.configureFlutterEngine(flutterEngine)

        // 初始化BasicMessageChannel传入名称,要和dart里定义的名称一致
//        val channel = BasicMessageChannel(
//            flutterEngine.dartExecutor.binaryMessenger, "msgChan", StringCodec.INSTANCE
//        );
//        val channel = EventChannel(
//            flutterEngine.dartExecutor.binaryMessenger, "eventChan"
//        )
        val channel = MethodChannel(
            flutterEngine.dartExecutor.binaryMessenger, "methodChan"
        )

        // 接收回调,返回ACK
        // kt语法糖: 最后一个方法直接省略
//        channel.setMessageHandler { message, reply ->
//            Log.d(TAG, "configureFlutterEngine: Android receive message: " + message)
//            reply.reply("ACK from Android")
//
//            // 延迟1秒发送
//            Handler(Looper.getMainLooper()).postDelayed({
//                // 发送消息给dart
//                channel.send("hello from android")
//            }, 1000)
//        }
        // 设置事件流的handler
//        channel.setStreamHandler(object : EventChannel.StreamHandler {
//            override fun onListen(arguments: Any?, events: EventChannel.EventSink?) {
//                Log.d(TAG, "onListen: eventChan")
//
//                Handler(Looper.getMainLooper()).postDelayed({
//                    Log.d(TAG, "onListen: send ADK from android")
//
//                    events?.success("ACK from android")
//                }, 1000)
//            }
//
//            override fun onCancel(arguments: Any?) {
//                Log.d(TAG, "onCancel: eventChan cancel")
//            }
//        })

        channel.setMethodCallHandler { methodCall: MethodCall, result: MethodChannel.Result ->
            if (methodCall.method == METHOD_NAME) {
                val name = methodCall.argument<String>("name")
                val version = methodCall.argument<String>("version")
                val language = methodCall.argument<String>("language")
                val androidApi = methodCall.argument<Int>("android_api")
                Log.d(
                    TAG, "configureFlutterEngine: \n" +
                            "name=$name, version=$version, language=$language, androidApi=$androidApi"
                )
                result.success("ACK from android")
            }

        }
    }
}

4-11Flutter混合开发 总结

{5}–第5章Flutter3.x新特性

5-1Flutter3.x新特性 本章导学

5-2Flutter3.x简介

5-3Flutter3.x支持多平台运行实战演示

5-4Flutter3.x无障碍功能支持的开发

{6}–第6章Flutter编译原理及多场景的调试优化技术

6-1Flutter代码调试 本章导学

6-2Flutter底层编译原理及打包方式

6-3通过断点的方式深入Dart代码运行时

6-4基于JIT热更新的高效Log调试

6-5通过Inspector深入优化UI布局

6-6性能面板的使用技巧及Dart内存调优

{7}–第7章实战–混合式开发框架搭建及项目架构设计

7-1首页框架搭建 本章导学

7-2 实战 混合开发项目创建


7-3 实战 实现页面导航管理（一）

赏

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