Flutter 构建一个完整的聊天应用程序

在本教程中，我将向您展示如何使用 Flutter 构建一个完整的聊天应用程序。对于这一部分，我们将创建应用程序的 UI 原型，然后我将向您展示如何使用 firebase 创建后端服务并创建聊天系统。

UI的源代码

import 'package:flutter/material.dart';void main() {runApp(MaterialApp(debugShowCheckedModeBanner: false,home: ChatApp(),));
}class ChatApp extends StatefulWidget {@override_ChatAppState createState() => _ChatAppState();
}class _ChatAppState extends State<ChatApp> {//for the rest of the tutorial I'll need to import a set of images' Url for the avatar//this is my images listList<String> _avatarUrl = ["https://images.unsplash.com/photo-1573890990305-0ab6a7195ab6?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=634&q=80","https://images.unsplash.com/photo-1463453091185-61582044d556?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80","https://images.unsplash.com/photo-1545130368-4c55e2418062?ixlib=rb-1.2.1&auto=format&fit=crop&w=926&q=80","https://images.unsplash.com/photo-1438761681033-6461ffad8d80?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80","https://images.unsplash.com/photo-1470441623172-c47235e287ee?ixlib=rb-1.2.1&auto=format&fit=crop&w=1052&q=80","https://images.unsplash.com/photo-1458662236860-b721a6735660?ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80","https://images.unsplash.com/photo-1530268729831-4b0b9e170218?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1050&q=80","https://images.unsplash.com/photo-1534308143481-c55f00be8bd7?ixlib=rb-1.2.1&auto=format&fit=crop&w=1188&q=80","https://images.unsplash.com/photo-1525879000488-bff3b1c387cf?ixlib=rb-1.2.1&auto=format&fit=crop&w=634&q=80","https://images.unsplash.com/photo-1535201344891-231e85e83c8a?ixlib=rb-1.2.1&auto=format&fit=crop&w=1050&q=80"];//Avatar widgetWidget avatarWidget(String urlImg, double radius) {return Container(width: radius,height: radius,decoration: BoxDecoration(shape: BoxShape.circle,image: DecorationImage(fit: BoxFit.cover,alignment: Alignment.topCenter,image: NetworkImage(urlImg),)),);}//StoryButton widgetWidget storyButton(String urlImg, double radius) {return InkWell(onTap: () {},child: Padding(padding: const EdgeInsets.symmetric(horizontal: 8.0),child: Container(width: radius,height: radius,decoration: BoxDecoration(shape: BoxShape.circle,image: DecorationImage(fit: BoxFit.cover,alignment: Alignment.topCenter,image: NetworkImage(urlImg),)),),),);}//List items widgetWidget listItem(String urlImg, String userName, String, message, String hour) {return InkWell(onTap: () {},child: Padding(padding: EdgeInsets.symmetric(vertical: 8.0, horizontal: 4.0),child: Container(child: Row(children: [avatarWidget(urlImg, 60.0),SizedBox(width: 10.0,),Expanded(child: Column(mainAxisAlignment: MainAxisAlignment.start,crossAxisAlignment: CrossAxisAlignment.start,children: [Text(userName,style: TextStyle(color: Colors.white,fontSize: 20.0,fontWeight: FontWeight.bold,),),Text(message,style: TextStyle(color: Colors.white,fontSize: 16.0,fontWeight: FontWeight.w300,),),],),),Text(hour,style: TextStyle(color: Colors.grey[50],),)],),),),);}@overrideWidget build(BuildContext context) {return Scaffold(backgroundColor: Colors.black,body: Container(child: Padding(padding: const EdgeInsets.symmetric(horizontal: 15.0, vertical: 35.0),child: Column(children: [//First let's create our menu barRow(children: [// for the first par i'll need to create a custom widget for my avatar buttonavatarWidget(_avatarUrl[0], 50.0),SizedBox(width: 10.0,),Expanded(child: Text("Messages",style: TextStyle(color: Colors.white,fontSize: 20.0,fontWeight: FontWeight.w700,),),),MaterialButton(onPressed: () {},elevation: 0.0,padding: EdgeInsets.all(8.0),color: Colors.blue,shape: CircleBorder(),child: Icon(Icons.edit, color: Colors.white),)],),//Now let's create the search barSizedBox(height: 20.0,),TextField(cursorColor: Colors.white,style: TextStyle(color: Colors.white),decoration: InputDecoration(prefixIcon: Icon(Icons.search, color: Colors.white),hintText: "Search",contentPadding: EdgeInsets.only(left: 34.0),filled: true,fillColor: Colors.grey[800],border: OutlineInputBorder(borderRadius: BorderRadius.circular(50.0),borderSide: BorderSide.none,)),),SizedBox(height: 20.0,),//Now it's time to create our list view for storysContainer(height: 60.0,width: double.infinity,child: ListView(scrollDirection: Axis.horizontal,children: [//let's now create our story widget, but before let's add the add buttonMaterialButton(onPressed: () {},elevation: 0.0,padding: EdgeInsets.all(8.0),color: Colors.grey[800],shape: CircleBorder(),child: Icon(Icons.add, color: Colors.grey[300]),),//Now let's create our storybutton widgetstoryButton(_avatarUrl[1], 60.0),storyButton(_avatarUrl[2], 60.0),storyButton(_avatarUrl[3], 60.0),storyButton(_avatarUrl[4], 60.0),],),),SizedBox(height: 10.0,),//Now we will build the chat feed listviewExpanded(child: ListView(children: [//first let's create our list items widgetlistItem(_avatarUrl[2], "David ro", String, "Wassup", "9:53PM"),listItem(_avatarUrl[3], "kasidie", String,"We are waiting for you", "8:33PM"),listItem(_avatarUrl[4], "Lynda", String,"Hey can you help me", "6:54AM"),listItem(_avatarUrl[5], "Suizie Q", String, "hank you","Yesterday"),listItem(_avatarUrl[7], "Joseph", String, "Hey wassup","Yesterday"),listItem(_avatarUrl[8], "Jonathan", String, "okey","Mon, 8:50AM"),//and now all what you have to do is to duplicate that line to have a real chat feed],),)],),),),//Now i'm going to create the button menu barbottomNavigationBar: BottomNavigationBar(backgroundColor: Colors.black,unselectedItemColor: Colors.white,selectedItemColor: Colors.blue,items: [BottomNavigationBarItem(icon: Icon(Icons.message),title: Text("Chat"),),BottomNavigationBarItem(icon: Icon(Icons.people),title: Text("Friend Requests"),),],),);}
}

有时，在获取与您的目标区域相关的相关新信息时，很少有这样的博客会变得非常有用。当我发现这个博客并感谢传递到我的数据库的信息时。

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