Flutter 常用插件汇总

 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()); 

 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'; 

 import 'package:flutter_easyrefresh/easy_refresh.dart'; //... EasyRefresh( child: ScrollView(), onRefresh: () async{ .... }, onLoad: () async { .... }, ) 

 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, ) 

 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); } 

 CachedNetworkImage( imageUrl: "http://via.placeholder.com/350x150", placeholder: (context, url) => CircularProgressIndicator(), errorWidget: (context, url, error) => Icon(Icons.error), ), //...... 

 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); } 

 import 'dart:io'; import 'package:flutter/material.dart'; import 'package:image_picker/image_picker.dart'; //...... class _MyHomePageState extends State { 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), ), ); } } 

 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, ) 

 // 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