概述
DIO网络请求框架
提起 Flutter 的网络框架,就不得不提 DIO,而且令人自豪的是 DIO 是国人开发的哦!DIO 作为一个网络框架实现了全部的网络请求,包括 GET、POST、PUT、PATCH、DELETE等,同时还支持拦截器,错误捕获和文件下载。借助 DIO,可以快速完成 Flutter App 与后端的数据交互。示例代码如下:
Response response; var dio = Dio(); response = await dio.get('/test?id=12&name=wendu'); print(response.data.toString()); // Optionally the request above could also be done as response = await dio.get('/test', queryParameters: {'id': 12, 'name': 'wendu'}); print(response.data.toString());
DIO最新版本为4.0,在github 上有近万个 Star,流行指数达到了99%,项目地址为:pub.flutter-io.cn/packages/di…
url_launcher系统应用跳转
在 App 中不可避免会使用url 跳转到系统浏览器或其他应用,这时候 url_launcher 就派上用场了, 用法十分简单:
import 'package:flutter/material.dart'; import 'package:url_launcher/url_launcher.dart'; const _url = 'https://flutter.cn'; void main() => runApp( const MaterialApp( home: Material( child: Center( child: RaisedButton( onPressed: _launchURL, child: Text('Show Flutter homepage'), ), ), ), ), ); void _launchURL() async => await canLaunch(_url) ? await launch(_url) : throw 'Could not launch $_url';
url_launcher支持跳转到系统的浏览器打开网页,跳转拨打电话和发送短信界面,在 pub 上流行度为100%,项目地址为:pub.flutter-io.cn/packages/ur…
flutter_easyrefresh上下拉刷新
flutter 中上下拉加载数据的不二之选,也是国人开发的,支持在大部分组件上套用实现上拉加载或下拉刷新。使用方法也是很简单,同时也支持自定义 header 和 footer。
import 'package:flutter_easyrefresh/easy_refresh.dart'; //... EasyRefresh( child: ScrollView(), onRefresh: () async{ .... }, onLoad: () async { .... }, )
flutter_easyrefresh 在 pub 上的流行度为95%,项目地址为:pub.flutter-io.cn/packages/fl…
flutter_swiper 轮播组件
flutter_swiper 是一个轮播组件,号称是 flutter 最佳的轮播组件。flutter_swiper 支持自动轮播,显示页面指示,动画时长,点击回调等多种参数设置。
new Swiper( itemBuilder: (BuildContext context, int index) { return new Image.network( "http://via.placeholder.com/288x188", fit: BoxFit.fill, ); }, itemCount: 10, viewportFraction: 0.8, scale: 0.9, )
flutter_swiper 的流行度达到了99%,项目地址为:pub.flutter-io.cn/packages/fl…
catcher 异常捕获
catcher 是一个 flutter 的全局异常捕获插件,可以自动捕捉到系统的异常,并且可以指定异常上报地址自动将运行错误上报给服务端,从而方便开发者跟踪程序的 Bug 进而进行修复。
import 'package:flutter/material.dart'; import 'package:catcher/catcher.dart'; main() { /// STEP 1. Create catcher configuration. /// Debug configuration with dialog report mode and console handler. It will show dialog and once user accepts it, error will be shown /// in console. CatcherOptions debugOptions = CatcherOptions(DialogReportMode(), [ConsoleHandler()]); /// Release configuration. Same as above, but once user accepts dialog, user will be prompted to send email with crash to support. CatcherOptions releaseOptions = CatcherOptions(DialogReportMode(), [ EmailManualHandler(["support@email.com"]) ]); /// STEP 2. Pass your root widget (MyApp) along with Catcher configuration: Catcher(rootWidget: MyApp(), debugConfig: debugOptions, releaseConfig: releaseOptions); }
catcher 的流行度达到了95%,项目地址为:pub.flutter-io.cn/packages/ca…
cached_network_image 网络图片加载缓存
cached_network_image 有点类似iOS的 SDWebImage,可以缓存已经加载过的图片而无需重复下载,既提高了加载速度也节省了网络资源请求。同时 cached_network_image 支持占位图、加载进度和请求失败的占位组件,可以做到很好的用户体验。
CachedNetworkImage( imageUrl: "http://via.placeholder.com/350x150", placeholder: (context, url) => CircularProgressIndicator(), errorWidget: (context, url, error) => Icon(Icons.error), ), //......
cached_network_image 流行度达到了99%,项目地址为:pub.flutter-io.cn/packages/ca…
shared_preferences 本地离线键值对缓存
shared_preferences类似iOS的 NSUserDefaults和安卓的 SharedPreferences,支持App简单的键值对离线缓存,对于离线存储简单的数据十分适用。但是需要注意的是插件的离线写入操作是异步的,因此并不能保证写入返回后100%存储成功,因此对于十分关键的数据不建议使用。
import 'package:flutter/material.dart'; import 'package:shared_preferences/shared_preferences.dart'; void main() { runApp(MaterialApp( home: Scaffold( body: Center( child: RaisedButton( onPressed: _incrementCounter, child: Text('Increment Counter'), ), ), ), )); } _incrementCounter() async { SharedPreferences prefs = await SharedPreferences.getInstance(); int counter = (prefs.getInt('counter') ?? 0) + 1; print('Pressed $counter times.'); await prefs.setInt('counter', counter); }
shared_preferences的流行度为100%,项目地址为:pub.flutter-io.cn/packages/sh…
image_picker 和 multi_image_pikcer 图片选择器
image_picker 和 multi_image_picker 为图片选择器,前者支持单张图片选择,后者支持多图选择,二者均支持相机或从相册选择图片。需要注意的是 multi_image_picker 默认语言是英文的,需要自己配置本地语言。
import 'dart:io'; import 'package:flutter/material.dart'; import 'package:image_picker/image_picker.dart'; //...... class _MyHomePageState extends State<MyHomePage> { File _image; final picker = ImagePicker(); Future getImage() async { final pickedFile = await picker.getImage(source: ImageSource.camera); setState(() { if (pickedFile != null) { _image = File(pickedFile.path); } else { print('No image selected.'); } }); } @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar( title: Text('Image Picker Example'), ), body: Center( child: _image == null ? Text('No image selected.') : Image.file(_image), ), floatingActionButton: FloatingActionButton( onPressed: getImage, tooltip: 'Pick Image', child: Icon(Icons.add_a_photo), ), ); } }
image_picker 项目地址为:pub.flutter-io.cn/packages/im…,multi_image_picker 项目地址为:pub.flutter-io.cn/packages/mu…。
marquee滚动文字组件
遇到文字太长不想换行也不想截断的时候就可以使用 marquee 了,marquee 在文字超出容器宽度后会自动滚动播报。同时,marquee 支持设置文字的多种参数,如字体,滚动方向,留白,滚动速度等等。
Marquee( text: 'Some sample text that takes some space.', style: TextStyle(fontWeight: FontWeight.bold), scrollAxis: Axis.horizontal, crossAxisAlignment: CrossAxisAlignment.start, blankSpace: 20.0, velocity: 100.0, pauseAfterRound: Duration(seconds: 1), startPadding: 10.0, accelerationDuration: Duration(seconds: 1), accelerationCurve: Curves.linear, decelerationDuration: Duration(milliseconds: 500), decelerationCurve: Curves.easeOut, )
marquee 的流行度达到了96%,项目地址为:pub.flutter-io.cn/packages/ma…。
sqflite 本地数据库访问
sqflite 从名字就知道它是用于手机端 sqlite 数据库访问的工具,支持 sqlite 数据库的全部增改删查操作,同时还支持事务和批量操作。SQL 的操作支持直接执行SQL 语句,也支持模板语法。
// Get a location using getDatabasesPath var databasesPath = await getDatabasesPath(); String path = join(databasesPath, 'demo.db'); // Delete the database await deleteDatabase(path); // open the database Database database = await openDatabase(path, version: 1, onCreate: (Database db, int version) async { // When creating the db, create the table await db.execute( 'CREATE TABLE Test (id INTEGER PRIMARY KEY, name TEXT, value INTEGER, num REAL)'); }); // Insert some records in a transaction await database.transaction((txn) async { int id1 = await txn.rawInsert( 'INSERT INTO Test(name, value, num) VALUES("some name", 1234, 456.789)'); print('inserted1: $id1'); int id2 = await txn.rawInsert( 'INSERT INTO Test(name, value, num) VALUES(?, ?, ?)', ['another name', 12345678, 3.1416]); print('inserted2: $id2'); }); // Update some record int count = await database.rawUpdate( 'UPDATE Test SET name = ?, value = ? WHERE name = ?', ['updated name', '9876', 'some name']); print('updated: $count'); // Get the records List<Map> list = await database.rawQuery('SELECT * FROM Test'); List<Map> expectedList = [ {'name': 'updated name', 'id': 1, 'value': 9876, 'num': 456.789}, {'name': 'another name', 'id': 2, 'value': 12345678, 'num': 3.1416} ]; print(list); print(expectedList); assert(const DeepCollectionEquality().equals(list, expectedList)); // Count the records count = Sqflite .firstIntValue(await database.rawQuery('SELECT COUNT(*) FROM Test')); assert(count == 2); // Delete a record count = await database .rawDelete('DELETE FROM Test WHERE name = ?', ['another name']); assert(count == 1); // Close the database await database.close();
sqflite 流行度达到了100%,如果为了应用中更好地维护最好是再封装一层,项目地址为:pub.flutter-io.cn/packages/sq…。
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