[flutter, package] How to use external package

How to use external package

井民全, Jing, mqjing@gmail.com

GitHub

TL;DR

This document shows you how to use external packages which are based on the doc here.

# Step 1: Install package: you can review the package on pub.dev flutter pub add english_words  # Step 2: Code File: ./lib/main.dart import 'package:english_words/english_words.dart'; final wordPair = WordPair.random(); // <<---- Create a compound word randomly child: Text(wordPair.asPascalCase), //<---- show the WordPair # Step 3: Run flutter run

Table of contents

1. Install package 1

2. Usage 2

2.1. Code 2

2.2. Run 3

3. Result 3

4. References 4

1. Install package

flutter pub add $PACKAGE-NAME   # you can review the package on pub.dev.

Where

• pub: the commands for managing Flutter packages 

Ex

Following command will install the english_words package to your project.

flutter pub add english_words

Check

File: pubspec.yaml

... dependencies:   flutter: sdk: flutter   cupertino_icons: ^1.0.2   english_words: ^4.0.0 ...

2. Usage

2.1. Code

File: ./lib/main.dart

import 'package:english_words/english_words.dart'; import 'package:flutter/material.dart'; void main() => runApp(MyApp()); class MyApp extends StatelessWidget { // Create a widget that does not require mutable state   @override   Widget build(BuildContext context) { // Overwrite the build method     final wordPair = WordPair.random(); // <<---- Create a compound word randomly     return MaterialApp( // Create a App that uses material design       title: 'Welcome to Flutter',       home: Scaffold( // Apply the basic material layout         appBar: AppBar(           title: const Text('Welcome to Flutter'),         ),         body: Center(           child: Text(wordPair.asPascalCase), //<---- show the WordPair         ),       ),     );   } }

2.2. Run

flutter run

3. Result

4. References

1. https://flutter.dev/docs/get-started/codelab

2. English_words API

3. Scaffold-class