基于flutter3.x+material-design3仿微信App应用实战

原创

andy2018

发布于 2024-02-07 09:45:44

9330

发布于 2024-02-07 09:45:44

文章被收录于专栏：h5

flutter3-wchat一款基于flutter3+dart3+material-ui技术构建的跨多端仿微信聊天项目。

flutter3已经支持全终端项目开发，可编译到android/ios/windows/macos/linux/web等多个平台。

使用技术

开发工具：vscode
框架技术：flutter3.16.5+dart3.2.3
UI组件库：material-design3
弹窗组件：showDialog/SimpleDialog/showModalBottomSheet/AlertDialog
图片预览：photo_view^0.14.0
本地缓存：shared_preferences^2.2.2
下拉刷新：easy_refresh^3.3.4
toast提示：toast^0.3.0
网址预览组件：url_launcher^6.2.4

项目结构

使用flutter create flutter_chat命令创建项目，生成的多端结构如下：

在开始开发之前，需要先配置好相应的开发环境。

https://flutter.dev/

https://pub.flutter-io.cn/

https://www.dartcn.com/

入口配置main.dart

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

// 引入公共样式
import 'styles/index.dart';

// 引入底部tabbar
import 'components/tabbar.dart';

// 引入路由管理
import 'router/index.dart';

// 错误模块
import '../views/error/index.dart';

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

DateTime? lastPopTime;

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

  // 退出app提示
  Future<bool> appOnPopInvoked(didPop) async {
    if(lastPopTime == null || DateTime.now().difference(lastPopTime!) > const Duration(seconds: 2)) {
      lastPopTime = DateTime.now();
      Toast.show('再按一次退出应用');
      return false;
    }
    SystemNavigator.pop();
    return true;
  }
  
    @override
    Widget build(BuildContext context){
    ToastContext().init(context);

        return MaterialApp(
            title: 'Flutter Chat',
            debugShowCheckedModeBanner: false,
            theme: ThemeData(
                primaryColor: FStyle.primaryColor,
                useMaterial3: true,
        // windows桌面端字体粗细不一样
        fontFamily: Platform.isWindows ? 'Microsoft YaHei' : null,
            ),
            // home: const FTabBar(),
      home: PopScope(
        // canPop: false,
        onPopInvoked: appOnPopInvoked,
        child: const FTabBar(),
      ),
      // 初始路由
      // initialRoute: '/',
      // 自定义路由
            onGenerateRoute: onGenerateRoute,
      // 错误路由
      onUnknownRoute: (settings) {
        return MaterialPageRoute(builder: (context) => const Error());
      },
        );
    }
}

Flutter3表单验证

验证码60s倒计时

Timer? timer;
String vcodeText = '获取验证码';
bool disabled = false;
int time = 60;

// 60s倒计时
void handleVcode() {
  if(authObj['tel'] == '') {
    snackbar('手机号不能为空');
  }else if(!Utils.checkTel(authObj['tel'])) {
    snackbar('手机号格式不正确');
  }else {
    setState(() {
      disabled = true;
    });
    startTimer();
  }
}
startTimer() {
  timer = Timer.periodic(const Duration(seconds: 1), (timer) {
    setState(() {
      if(time > 0) {
        vcodeText = '获取验证码(${time--})';
      }else {
        vcodeText = '获取验证码';
        time = 60;
        disabled = false;
        timer.cancel();
      }
    });
  });
  snackbar('短信验证码已发送，请注意查收', color: Colors.green);
}

文本框/按钮圆角渐变色

Container(
  height: 40.0,
  margin: const EdgeInsets.symmetric(vertical: 5.0, horizontal: 30.0),
  decoration: BoxDecoration(
    color: Colors.white,
    border: Border.all(color: const Color(0xffdddddd)),
    borderRadius: BorderRadius.circular(15.0),
  ),
  child: Row(
    children: [
      Expanded(
        child: TextField(
          keyboardType: TextInputType.phone,
          controller: fieldController,
          decoration: InputDecoration(
            hintText: '输入手机号',
            suffixIcon: Visibility(
              visible: authObj['tel'].isNotEmpty,
              child: InkWell(
                hoverColor: Colors.transparent,
                highlightColor: Colors.transparent,
                splashColor: Colors.transparent,
                onTap: handleClear,
                child: const Icon(Icons.clear, size: 16.0,),
              )
            ),
            contentPadding: const EdgeInsets.symmetric(vertical: 0, horizontal: 12.0),
            border: const OutlineInputBorder(borderSide: BorderSide.none),
          ),
          onChanged: (value) {
            setState(() {
              authObj['tel'] = value;
            });
          },
        ),
      )
    ],
  ),
),

渐变色是通过Container组件gradient实现。

Container(
  margin: const EdgeInsets.symmetric(vertical: 10.0, horizontal: 30.0),
  decoration: BoxDecoration(
    borderRadius: BorderRadius.circular(15.0),
    // 自定义按钮渐变色
    gradient: const LinearGradient(
      begin: Alignment.topLeft,
      end: Alignment.bottomRight,
      colors: [
        Color(0xFF0091EA), Color(0xFF07C160)
      ],
    )
  ),
  child: SizedBox(
    width: double.infinity,
    height: 45.0,
    child: FilledButton(
      style: ButtonStyle(
        backgroundColor: MaterialStateProperty.all(Colors.transparent),
        shadowColor: MaterialStateProperty.all(Colors.transparent),
        shape: MaterialStatePropertyAll(
          RoundedRectangleBorder(borderRadius: BorderRadius.circular(15.0))
        )
      ),
      onPressed: handleSubmit,
      child: const Text('登录', style: TextStyle(fontSize: 18.0),),
    ),
  )
),

Flutter3渐变色导航条

在flutter中Appbar组件background属性只能单纯设置颜色，不能设置渐变背景。可通过FlexibleSpace属性设置背景渐变色/渐变背景图。

AppBar(
  title: Text('Flutter3-Chat'),
  flexibleSpace: Container(
    decoration: const BoxDecoration(
      gradient: LinearGradient(
        begin: Alignment.topLeft,
        end: Alignment.bottomRight,
        colors: [
          Color(0xFF0091EA), Color(0xFF07C160)
        ],
      )
    ),
  )
),

flutter3实现各种弹窗效果。

// 关于弹窗
void aboutAlertDialog(BuildContext context) {
  showDialog(
    context: context,
    builder: (context) {
      return UnconstrainedBox(
        constrainedAxis: Axis.vertical,
        child: SizedBox(
          width: 320.0,
          child: AlertDialog(
            contentPadding: const EdgeInsets.symmetric(horizontal: 10.0, vertical: 20.0),
            backgroundColor: Colors.white,
            surfaceTintColor: Colors.white,
            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12.0)),
            content: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 10.0),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Image.asset('assets/images/logo.png', width: 90.0, height: 90.0, fit: BoxFit.cover,),
                  const SizedBox(height: 10.0),
                  const Text('Flutter3-WChat', style: TextStyle(color: Color(0xFF0091EA), fontSize: 22.0),),
                  const SizedBox(height: 5.0),
                  const Text('基于flutter3+dart3开发跨平台仿微信App聊天实例。', style: TextStyle(color: Colors.black45),),
                  const SizedBox(height: 20.0),
                  Text('©2024/01 Andy   Q: 282310962', style: TextStyle(color: Colors.grey[400], fontSize: 12.0),),
                ],
              ),
            ),
          ),
        ),
      );
    }
  );
}

// 二维码名片弹窗
void qrcodeAlertDialog(BuildContext context) {
  showDialog(
    context: context,
    builder: (context) {
      return UnconstrainedBox(
        constrainedAxis: Axis.vertical,
        child: SizedBox(
          width: 320.0,
          child: AlertDialog(
            contentPadding: const EdgeInsets.symmetric(horizontal: 10.0, vertical: 20.0),
            backgroundColor: const Color(0xFF07C160),
            surfaceTintColor: const Color(0xFF07C160),
            shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(3.0)),
            content: Padding(
              padding: const EdgeInsets.symmetric(horizontal: 10.0),
              child: Column(
                mainAxisSize: MainAxisSize.min,
                children: [
                  Image.asset('assets/images/qrcode.png', width: 250.0, fit: BoxFit.cover,),
                  const SizedBox(height: 15.0),
                  const Text('扫一扫，加我公众号', style: TextStyle(color: Colors.white60, fontSize: 14.0,),),
                ],
              ),
            ),
          ),
        ),
      );
    }
  );
}

// 退出登录弹窗
void logoutAlertDialog(BuildContext context) {
  showDialog(
    context: context,
    builder: (context) {
      return AlertDialog(
        content: const Text('确定要退出登录吗？', style: TextStyle(fontSize: 16.0),),
        backgroundColor: Colors.white,
        surfaceTintColor: Colors.white,
        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12.0)),
        elevation: 2.0,
        actionsPadding: const EdgeInsets.all(15.0),
        actions: [
          TextButton(
            onPressed: () {Navigator.of(context).pop();},
            child: const Text('取消', style: TextStyle(color: Colors.black54),)
          ),
          TextButton(
            onPressed: handleLogout,
            child: const Text('退出登录', style: TextStyle(color: Colors.red),)
          ),
        ],
      );
    }
  );
}

flutter微信朋友圈九宫格

GroupZone(images: item['images']),

GroupZone(
  images: uploadList,
  album: true,
  onChoose: () async {
    Toast.show('选择手机相册图片', duration: 2, gravity: 1);
  },
),

// 创建可点击预览图片
createImage(BuildContext context, String img, int key) {
  return GestureDetector(
    child: Hero(
      tag: img, // 放大缩小动画效果标识
      child: img == '+' ? 
      Container(color: Colors.transparent, child: const Icon(Icons.add, size: 30.0, color: Colors.black45),)
      :
      Image.asset(
        img,
        width: width,
        fit: BoxFit.contain,
      ),
    ),
    onTap: () {
      // 选择图片
      if(img == '+') {
        onChoose!();
      }else {
        Navigator.of(context).push(FadeRoute(route: ImageViewer(
          images: album ? imgList!.sublist(0, imgList!.length - 1) : imgList,
          index: key,
        )));
      }
    },
  );
}

Flutter3微信聊天语音模块

// 语音
Offstage(
  offstage: !voiceBtnEnable,
  child: GestureDetector(
    child: Container(
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(5),
      ),
      alignment: Alignment.center,
      height: 40.0,
      width: double.infinity,
      child: Text(voiceTypeMap[voiceType], style: const TextStyle(fontSize: 15.0),),
    ),
    onPanStart: (details) {
      setState(() {
        voiceType = 1;
        voicePanelEnable = true;
      });
    },
    onPanUpdate: (details) {
      Offset pos = details.globalPosition;
      double swipeY = MediaQuery.of(context).size.height - 120;
      double swipeX = MediaQuery.of(context).size.width / 2 + 50;
      setState(() {
        if(pos.dy >= swipeY) {
          voiceType = 1; // 松开发送
        }else if (pos.dy < swipeY && pos.dx < swipeX) {
          voiceType = 2; // 左滑松开取消
        }else if (pos.dy < swipeY && pos.dx >= swipeX) {
          voiceType = 3; // 右滑语音转文字
        }
      });
    },
    onPanEnd: (details) {
      // print('停止录音');
      setState(() {
        switch(voiceType) {
          case 1:
            Toast.show('发送录音文件', duration: 1, gravity: 1);
            voicePanelEnable = false;
            break;
          case 2:
            Toast.show('取消发送', duration: 1, gravity: 1);
            voicePanelEnable = false;
            break;
          case 3:
            Toast.show('语音转文字', duration: 1, gravity: 1);
            voicePanelEnable = true;
            voiceToTransfer = true;
            break;
        }
        voiceType = 0;
      });
    },
  ),
),

按住说话/左滑取消/右滑转语音功能。

// 录音主体(按住说话/松开取消/语音转文本)
Visibility(
  visible: voicePanelEnable,
  child: Material(
    color: const Color(0xDD1B1B1B),
    child: Stack(
      children: [
        // 取消发送+语音转文字
        Positioned(
          bottom: 120,
          left: 30,
          right: 30,
          child: Visibility(
            visible: !voiceToTransfer,
            child: Column(
              children: [
                // 语音动画层
                Stack(
                  children: [
                    Container(
                      height: 70.0,
                      margin: const EdgeInsets.symmetric(horizontal: 50.0),
                      decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.circular(15.0),
                      ),
                      child: Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          Image.asset('assets/images/voice_record.gif', height: 30.0,)
                        ],
                      ),
                    ),
                    Positioned(
                      right: (MediaQuery.of(context).size.width - 60) / 2,
                      bottom: 1,
                      child: RotatedBox(
                        quarterTurns: 0,
                        child: CustomPaint(painter: ArrowShape(arrowColor: Colors.white, arrowSize: 10.0)),
                      )
                    ),
                  ],
                ),
                const SizedBox(height: 50.0,),
                // 操作项
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    // 取消发送
                    Container(
                      height: 60.0,
                      width: 60.0,
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(50.0),
                        color: voiceType == 2 ? Colors.red : Colors.black38,
                      ),
                      child: const Icon(Icons.close, color: Colors.white54,),
                    ),
                    // 语音转文字
                    Container(
                      height: 60.0,
                      width: 60.0,
                      decoration: BoxDecoration(
                        borderRadius: BorderRadius.circular(50.0),
                        color: voiceType == 3 ? Colors.green : Colors.black38,
                      ),
                      child: const Icon(Icons.translate, color: Colors.white54,),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
        // 语音转文字(识别结果状态)
        Positioned(
          bottom: 120,
          left: 30,
          right: 30,
          child: Visibility(
            visible: voiceToTransfer,
            child: Column(
              children: [
                // 提示结果
                Stack(
                  children: [
                    Container(
                      height: 100.0,
                      decoration: BoxDecoration(
                        color: Colors.red,
                        borderRadius: BorderRadius.circular(15.0),
                      ),
                      child: const Row(
                        mainAxisAlignment: MainAxisAlignment.center,
                        children: [
                          Icon(Icons.info, color: Colors.white,),
                          Text('未识别到文字。', style: TextStyle(color: Colors.white),),
                        ],
                      ),
                    ),
                    Positioned(
                      right: 35.0,
                      bottom: 1,
                      child: RotatedBox(
                        quarterTurns: 0,
                        child: CustomPaint(painter: ArrowShape(arrowColor: Colors.red, arrowSize: 10.0)),
                      )
                    ),
                  ],
                ),
                const SizedBox(height: 50.0,),
                // 操作项
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    GestureDetector(
                      child: Container(
                        height: 60.0,
                        width: 60.0,
                        decoration: const BoxDecoration(
                          color: Colors.transparent,
                        ),
                        child: const Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Icon(Icons.undo, color: Colors.white54,),
                            Text('取消', style: TextStyle(color: Colors.white70),)
                          ],
                        ),
                      ),
                      onTap: () {
                        setState(() {
                          voicePanelEnable = false;
                          voiceToTransfer = false;
                        });
                      },
                    ),
                    GestureDetector(
                      child: Container(
                        height: 60.0,
                        width: 100.0,
                        decoration: const BoxDecoration(
                          color: Colors.transparent,
                        ),
                        child: const Column(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            Icon(Icons.graphic_eq_rounded, color: Colors.white54,),
                            Text('发送原语音', style: TextStyle(color: Colors.white70),)
                          ],
                        ),
                      ),
                      onTap: () {},
                    ),
                    GestureDetector(
                      child: Container(
                        height: 60.0,
                        width: 60.0,
                        decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(50.0),
                          color: Colors.white12,
                        ),
                        child: const Icon(Icons.check, color: Colors.white12,),
                      ),
                      onTap: () {},
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
        // 提示文字(操作状态)
        Positioned(
          bottom: 120,
          left: 0,
          width: MediaQuery.of(context).size.width,
          child: Visibility(
            visible: !voiceToTransfer,
            child: Align(
              child: Text(voiceTypeMap[voiceType], style: const TextStyle(color: Colors.white70),),
            ),
          ),
        ),
        // 背景
        Align(
          alignment: Alignment.bottomCenter,
          child: Visibility(
            visible: !voiceToTransfer,
            child: Image.asset('assets/images/voice_record_bg.webp', width: double.infinity, height: 100.0, fit: BoxFit.fill),
          ),
        ),
        // 背景图标
        Positioned(
          bottom: 25,
          left: 0,
          width: MediaQuery.of(context).size.width,
          child: Visibility(
            visible: !voiceToTransfer,
            child: const Align(
              child: Icon(Icons.graphic_eq_rounded, color: Colors.black54,),
            ),
          ),
        ),
      ],
    ),
  ),
)

Okay，以上就是Flutter3/Dart3仿微信App聊天的一些知识分享。后续还会分享一些其它flutter实例项目。

原创声明：本文系作者授权腾讯云开发者社区发表，未经许可，不得转载。

如有侵权，请联系 cloudcommunity@tencent.com 删除。

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