Summary of commonly used plug-ins for Flutter

Response response;
var dio = Dio();
response = await ('/test?id=12&name=wendu');
print(());
// Optionally the request above could also be done as
response = await ('/test', queryParameters: {'id': 12, 'name': 'wendu'});
print(());

import 'package:flutter/';
import 'package:url_launcher/url_launcher.dart';

const _url = '';

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 (
      "/288x188",
      fit: ,
    );
  },
  itemCount: 10,
  viewportFraction: 0.8,
  scale: 0.9,
)

import 'package:flutter/';
import 'package:catcher/';

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@"])
  ]);

  /// STEP 2. Pass your root widget (MyApp) along with Catcher configuration:
  Catcher(rootWidget: MyApp(), debugConfig: debugOptions, releaseConfig: releaseOptions);
}

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

import 'package:flutter/';
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 ();
  int counter = (('counter') ?? 0) + 1;
  print('Pressed $counter times.');
  await ('counter', counter);
}

import 'dart:io';

import 'package:flutter/';
import 'package:image_picker/image_picker.dart';

//......

class _MyHomePageState extends State<MyHomePage> {
  File _image;
  final picker = ImagePicker();

  Future getImage() async {
    final pickedFile = await (source: );

    setState(() {
      if (pickedFile != null) {
        _image = File();
      } 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),
      ),
      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: ),
  scrollAxis: ,
  crossAxisAlignment: ,
  blankSpace: 20.0,
  velocity: 100.0,
  pauseAfterRound: Duration(seconds: 1),
  startPadding: 10.0,
  accelerationDuration: Duration(seconds: 1),
  accelerationCurve: ,
  decelerationDuration: Duration(milliseconds: 500),
  decelerationCurve: ,
)

// Get a location using getDatabasesPath
var databasesPath = await getDatabasesPath();
String path = join(databasesPath, '');

// 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 (
      'CREATE TABLE Test (id INTEGER PRIMARY KEY, name TEXT, value INTEGER, num REAL)');
});

// Insert some records in a transaction
await ((txn) async {
  int id1 = await (
      'INSERT INTO Test(name, value, num) VALUES("some name", 1234, 456.789)');
  print('inserted1: $id1');
  int id2 = await (
      'INSERT INTO Test(name, value, num) VALUES(?, ?, ?)',
      ['another name', 12345678, 3.1416]);
  print('inserted2: $id2');
});

// Update some record
int count = await (
    'UPDATE Test SET name = ?, value = ? WHERE name = ?',
    ['updated name', '9876', 'some name']);
print('updated: $count');

// Get the records
List<Map> list = await ('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 ('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 ();