全新研发flutter3+dart3+photo_view跨多端仿微信App界面聊天Flutter3-Chat。
flutter3-chat基于最新跨全平台技术flutter3+dart3+material-design+shared_preferences+easy_refresh构建的仿微信APP界面聊天实例项目。实现发送图文表情消息/gif大图、长按仿微信语音操作面板、图片预览、红包及朋友圈等功能。
技术架构
- 编辑器：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
Flutter3.x开发跨平台项目，性能有了大幅度提升，官方支持编译到android/ios/macos/windows/linux/web等多平台，未来可期！
项目构建目录
通过 flutter create app_project 命令即可快速创建一个跨平台初始化项目。
通过命令创建项目后，项目结构就如上图所示。
需要注意：flutter项目基于dart语音开发，需要首先配置Dart SDK和Flutter SDK开发环境，大家可以去官网查看配置文档。
另外使用VScode编辑器开发项目，可自行安装Flutter / Dart扩展插件。
由于flutter3支持编译到windows，大家可以开发初期在windows上面调试，后期release apk到手机上。
通过如下命令即可运行到windows平台
flutter run -d windows
运行后默认窗口大小为1280x720，可以修改windows/runner/main.cpp文件里面的窗口尺寸。
同样，可以通过 flutter run -d chrome 命令运行到web上预览。
假如在没有真机的情况下，我们可以选择模拟器调试。目前市面上有很多类型模拟器，他们使用adb连接时都会有不同的默认端口，下面列出了一些常用的模拟器及端口号。通过adb connect连接上指定模拟器之后，执行flutter run命令即可运行项目到模拟器上面。
flutter3实现圆角文本框及渐变按钮
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;
});
},
),
)
],
),
),
按钮渐变则是通过Container组件的decotaion里面的gradient属性设置渐变效果。
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),),
),
)
),
flutter实现60s倒计时发送验证码功能。
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(${time--})';
}else {
vcodeText = '获取验证码';
time = 60;
disabled = false;
timer.cancel();
}
});
});
snackbar('短信验证码已发送，请注意查收', color: Colors.green);
}
Flutter3沉浸式渐变状态导航栏
要实现如上图渐变AppBar也非常简单，只需要配置AppBar提供的可伸缩灵活区域属性 flexibleSpace 配合gradient即可快速实现渐变导航栏。
AppBar(
title: Text('Flutter3-Chat'),
flexibleSpace: Container(
decoration: const BoxDecoration(
gradient: LinearGradient(
begin: Alignment.topLeft,
end: Alignment.bottomRight,
colors: [
Color(0xFF0091EA), Color(0xFF07C160)
],
)
),
)
),
Flutter3字体图标/自定义badge
flutter内置了丰富的字体图标，通过图标组件 Icon(Icons.add) 引入即可使用。
https://api.flutter-io.cn/flutter/material/Icons-class.html
另外还支持通过自定义IconData方式自定义图标，如使用阿里iconfont图表库图标。
Icon(IconData(0xe666, fontFamily: 'iconfont'), size: 18.0)
把下载的字体文件放到assets目录，
在pubspec.yaml中引入字体文件。
class FStyle {
// 自定义iconfont图标
static iconfont(int codePoint, {double size = 16.0, Color? color}) {
return Icon(
IconData(codePoint, fontFamily: 'iconfont', matchTextDirection: true),
size: size,
color: color,
);
}
// 自定义Badge红点
static badge(int count, {
Color color = Colors.redAccent,
bool isdot = false,
double height = 18.0,
double width = 18.0
}) {
final num = count > 99 ? '99+' : count;
return Container(
alignment: Alignment.center,
height: isdot ? height / 2 : height,
width: isdot ? width / 2 : width,
decoration: BoxDecoration(color: color, borderRadius: BorderRadius.circular(100.00)),
child: isdot ? null : Text('$num', style: const TextStyle(color: Colors.white, fontSize: 12.0)),
);
}
}
FStyle.badge(23) FStyle.badge(2, color: Colors.pink, height: 10.0, width: 10.0) FStyle.badge(0, isdot: true)
Flutter仿微信PopupMenu下拉菜单/下拉刷新
通过flutter提供的PopupMenuButton组件实现下拉菜单功能。
PopupMenuButton(
icon: FStyle.iconfont(0xe62d, size: 17.0),
offset: const Offset(0, 50.0),
tooltip: '',
color: const Color(0xFF353535),
itemBuilder: (BuildContext context) {
return <PopupMenuItem>[
popupMenuItem(0xe666, '发起群聊', 0),
popupMenuItem(0xe75c, '添加朋友', 1),
popupMenuItem(0xe603, '扫一扫', 2),
popupMenuItem(0xe6ab, '收付款', 3),
];
},
onSelected: (value) {
switch(value) {
case 0:
print('发起群聊');
break;
case 1:
Navigator.pushNamed(context, '/addfriends');
break;
case 2:
print('扫一扫');
break;
case 3:
print('收付款');
break;
}
},
)
// 下拉菜单项
static popupMenuItem(int codePoint, String title, value) {
return PopupMenuItem(
value: value,
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
children: [
const SizedBox(width: 10.0,),
FStyle.iconfont(codePoint, size: 21.0, color: Colors.white),
const SizedBox(width: 10.0,),
Text(title, style: const TextStyle(fontSize: 16.0, color: Colors.white),),
],
),
);
}
如上图：下拉刷新、上拉加载更多是通过 easy_refresh 组件实现功能。
EasyRefresh(
// 下拉加载提示
header: const ClassicHeader(
// showMessage: false,
),
// 加载更多提示
footer: ClassicFooter(),
// 下拉刷新逻辑
onRefresh: () async {
// ...下拉逻辑
await Future.delayed(const Duration(seconds: 2));
},
// 上拉加载逻辑
onl oad: () async {
// ...
},
child: ListView.builder(
itemCount: chatList.length,
itemBuilder: (context, index) {
return Ink(
// ...
);
},
),
)
如上图：弹窗功能均是自定义AlertDialog实现效果。通过无限制容器UnconstrainedBox配合SizedBox组件实现自定义窗口大小。
// 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实现微信朋友圈九宫格
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,
)));
}
},
);
}
使用photo_view插件实现预览大图功能，支持预览单张及多张大图。
import 'package:flutter/material.dart';
import 'package:photo_view/photo_view.dart';
import 'package:photo_view/photo_view_gallery.dart';
class ImageViewer extends StatefulWidget {
const ImageViewer({
super.key,
this.images,
this.index = 0,
});
final List? images; // 预览图列表
final int index; // 当前预览图索引
@override
State<ImageViewer> createState() => _ImageViewerState();
}
class _ImageViewerState extends State<ImageViewer> {
int currentIndex = 0;
@override
void initState() {
super.initState();
currentIndex = widget.index;
}
@override
Widget build(BuildContext context) {
var imgCount = widget.images?.length;
return Scaffold(
body: Stack(
children: [
Positioned(
top: 0,
left: 0,
bottom: 0,
right: 0,
child: GestureDetector(
child: imgCount == 1 ? PhotoView(
imageProvider: AssetImage(widget.images![0]),
backgroundDecoration: const BoxDecoration(
color: Colors.black,
),
minScale: PhotoViewComputedScale.contained,
maxScale: PhotoViewComputedScale.covered * 2,
heroAttributes: PhotoViewHeroAttributes(tag: widget.images![0]),
enableRotation: true,
)
:
PhotoViewGallery.builder(
itemCount: widget.images?.length,
builder: (context, index) {
return PhotoViewGalleryPageOptions(
imageProvider: AssetImage(widget.images![index]),
minScale: PhotoViewComputedScale.contained,
maxScale: PhotoViewComputedScale.covered * 2,
heroAttributes: PhotoViewHeroAttributes(tag: widget.images![index]),
);
},
scrollPhysics: const BouncingScrollPhysics(),
backgroundDecoration: const BoxDecoration(
color: Colors.black,
),
pageController: PageController(initialPage: widget.index),
enableRotation: true,
onPageChanged: (index) {
setState(() {
currentIndex = index;
});
},
),
onTap: () {
Navigator.of(context).pop();
},
),
),
// 图片索引index
Positioned(
top: MediaQuery.of(context).padding.top + 15,
width: MediaQuery.of(context).size.width,
child: Center(
child: Visibility(
visible: imgCount! > 1 ? true : false,
child: Text('${currentIndex+1} / ${widget.images?.length}', style: const TextStyle(color: Colors.white)),
)
),
),
],
),
);
}
}
flutter3聊天模块
文本框TextField设置maxLines: null即可实现多行文本输入，支持图文emoj混排，网址连接识别等功能。
// 输入框
Offstage(
offstage: voiceBtnEnable,
child: TextField(
decoration: const InputDecoration(
isDense: true,
hoverColor: Colors.transparent,
contentPadding: EdgeInsets.all(8.0),
border: OutlineInputBorder(borderSide: BorderSide.none),
),
style: const TextStyle(fontSize: 16.0,),
maxLines: null,
controller: editorController,
focusNode: editorFocusNode,
cursorColor: const Color(0xFF07C160),
onChanged: (value) {},
),
),
支持仿微信语音按住说话，左滑取消发送、右滑转换语音功能。
// 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;
});
},
),
),
按住录音显示面板
// 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,),
),
),
),
],
),
),
)
flutter3绘制箭头
聊天模块消息及各种箭头展示，通过flutter提供的画板功能绘制箭头。
// 绘制气泡箭头
class ArrowShape extends CustomPainter {
ArrowShape({
required this.arrowColor,
this.arrowSize = 7,
});
final Color arrowColor; // 箭头颜色
final double arrowSize; // 箭头大小
@override
void paint(Canvas canvas, Size size) {
var paint = Paint()..color = arrowColor;
var path = Path();
path.lineTo(-arrowSize, 0);
path.lineTo(0, arrowSize);
path.lineTo(arrowSize, 0);
canvas.drawPath(path, paint);
}
@override
bool shouldRepaint(CustomPainter oldDelegate) {
return false;
}
}
Okay，以上就是Flutter3+Dart3开发全平台聊天App实例的一些知识分享，希望对大家有所帮助哈~~
标签：const,color,App,Colors,width,跨平台,朋友圈,context,child From： https://www.cnblogs.com/xiaoyan2017/p/18008370