About the Tutorial

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About the Tutorial

Flutter is an open source framework to create high quality, high performance mobile

applications across mobile operating systems - Android and iOS. It provides a simple,

powerful, efficient and easy to understand SDK to write mobile application in Google¡¯s own

language, Dart.

This tutorial walks through the basics of Flutter framework, installation of Flutter SDK,

setting up Android Studio to develop Flutter based application, architecture of Flutter

framework and developing all type of mobile applications using Flutter framework.

Audience

This tutorial is prepared for professionals who are aspiring to make a career in the field of

mobile applications. This tutorial is intended to make you comfortable in getting started

with Flutter framework and its various functionalities.

Prerequisites

This tutorial is written assuming that the readers are already aware about what a

Framework is and that the readers have a sound knowledge on Object Oriented

Programming and basic knowledge on Android framework and Dart programming.

If you are a beginner to any of these concepts, we suggest you to go through tutorials

related to these first, before you start with Flutter.

Copyright & Disclaimer

@Copyright 2019 by Tutorials Point (I) Pvt. Ltd.

All the content and graphics published in this e-book are the property of Tutorials Point (I)

Pvt. Ltd. The user of this e-book is prohibited to reuse, retain, copy, distribute or republish

any contents or a part of contents of this e-book in any manner without written consent

of the publisher.

We strive to update the contents of our website and tutorials as timely and as precisely as

possible, however, the contents may contain inaccuracies or errors. Tutorials Point (I) Pvt.

Ltd. provides no guarantee regarding the accuracy, timeliness or completeness of our

website or its contents including this tutorial. If you discover any errors on our website or

in this tutorial, please notify us at contact@

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Table of Contents

About the Tutorial ............................................................................................................................................ i

Audience........................................................................................................................................................... i

Prerequisites..................................................................................................................................................... i

Copyright & Disclaimer ..................................................................................................................................... i

Table of Contents............................................................................................................................................. ii

1. FLUTTER ¨C INTRODUCTION .................................................................................................. 1

Features of Flutter ........................................................................................................................................... 1

Advantages of Flutter ...................................................................................................................................... 2

Disadvantages of Flutter .................................................................................................................................. 2

2. FLUTTER ¨C INSTALLATION..................................................................................................... 3

Installation in Windows ................................................................................................................................... 3

Installation in MacOS ....................................................................................................................................... 4

3. FLUTTER ¨C CREATING SIMPLE APPLICATION IN ANDROID STUDIO ....................................... 5

4. FLUTTER ¨C ARCHITECTURE OF FLUTTER APPLICATION ....................................................... 12

Widgets ......................................................................................................................................................... 12

Gestures ........................................................................................................................................................ 13

Concept of State ............................................................................................................................................ 13

Layers ............................................................................................................................................................ 13

5. FLUTTER ¨C INTRODUCTION TO DART PROGRAMMING ....................................................... 15

Variables and Data types ............................................................................................................................... 15

Decision Making and Loops ........................................................................................................................... 16

Functions ....................................................................................................................................................... 16

Object Oriented Programming ....................................................................................................................... 17

6. FLUTTER ¨C INTRODUCTION TO WIDGETS ........................................................................... 18

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Widget Build Visualization ............................................................................................................................. 19

7. FLUTTER ¨C INTRODUCTION TO LAYOUTS ............................................................................ 26

Type of Layout Widgets ................................................................................................................................. 26

Single Child Widgets ...................................................................................................................................... 26

Multiple Child Widgets .................................................................................................................................. 30

Advanced Layout Application ........................................................................................................................ 31

8. FLUTTER ¨C INTRODUCTION TO GESTURES .......................................................................... 40

9. FLUTTER ¨C STATE MANAGEMENT ...................................................................................... 45

Ephemeral State Management ...................................................................................................................... 45

Application State - scoped_model ................................................................................................................. 57

Navigation and Routing ................................................................................................................................. 68

10.

FLUTTER ¨C ANIMATION ................................................................................................... 82

Introduction................................................................................................................................................... 82

Animation Based Classes ............................................................................................................................... 82

Work flow of the Flutter Animation ............................................................................................................... 83

Working Application ...................................................................................................................................... 84

11.

FLUTTER ¨C WRITING ANDROID SPECIFIC CODE ............................................................... 93

12.

FLUTTER ¨C WRITING IOS SPECIFIC CODE ....................................................................... 100

13.

FLUTTER ¨C INTRODUCTION TO PACKAGE ...................................................................... 103

Types of Packages ........................................................................................................................................ 103

Using a Dart Package ................................................................................................................................... 104

Develop a Flutter Plugin Package ................................................................................................................. 104

14.

FLUTTER ¨C ACCESSING REST API.................................................................................... 114

Basic Concepts ............................................................................................................................................. 114

Accessing Product service API ...................................................................................................................... 115

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15.

FLUTTER ¨C DATABASE CONCEPTS.................................................................................. 125

SQLite .......................................................................................................................................................... 125

Cloud Firestore ............................................................................................................................................ 133

16.

FLUTTER ¨C INTERNATIONALIZATION ............................................................................. 138

Using intl Package ........................................................................................................................................ 143

17.

FLUTTER ¨C TESTING....................................................................................................... 147

Types of Testing ........................................................................................................................................... 147

Widget Testing ............................................................................................................................................. 147

Steps Involved ............................................................................................................................................. 148

Working Example ......................................................................................................................................... 149

18.

FLUTTER ¨C DEPLOYMENT .............................................................................................. 151

Android Application ..................................................................................................................................... 151

iOS Application ............................................................................................................................................ 151

19.

FLUTTER ¨C DEVELOPMENT TOOLS ................................................................................ 153

Widget Sets ................................................................................................................................................. 153

Flutter Development with Visual Studio Code ............................................................................................. 153

Dart DevTools .............................................................................................................................................. 153

Flutter SDK................................................................................................................................................... 155

20.

FLUTTER ¨C WRITING ADVANCED APPLICATIONS ........................................................... 157

21.

FLUTTER ¨C CONCLUSION ............................................................................................... 180

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