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Flutter Cookbook, Second Edition

You're reading from   Flutter Cookbook, Second Edition 100+ step-by-step recipes for building cross-platform, professional-grade apps with Flutter 3.10.x and Dart 3.x

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Product type Paperback
Published in May 2023
Publisher Packt
ISBN-13 9781803245430
Length 712 pages
Edition 2nd Edition
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Author (1):
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Simone Alessandria Simone Alessandria
Author Profile Icon Simone Alessandria
Simone Alessandria
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Table of Contents (19) Chapters Close

Preface 1. Getting Started with Flutter 2. Creating Your First Flutter App FREE CHAPTER 3. Dart: A Language You Already Know 4. Introduction to Widgets 5. Mastering Layout and Taming the Widget Tree 6. Adding Interactivity and Navigation to Your App 7. Basic State Management 8. The Future is Now: Introduction to Asynchronous Programming 9. Data Persistence and Communicating with the Internet 10. Advanced State Management with Streams 11. Using Flutter Packages 12. Adding Animations to Your App 13. Using Firebase 14. Firebase Machine Learning 15. Flutter Web and Desktop 16. Distributing Your Mobile App 17. Other Books You May Enjoy
18. Index

Accessing the filesystem, part 2 – working with directories

  1. In this section, we'll build upon the previous recipe so that you can read and write to files using Dart's Directory class and the dart:io library.

Getting ready

To follow along with this recipe, you need to have completed the previous recipe.

How to do it...

In this recipe, we will:

  • Create a new file inside our device or simulator/emulator.
  • Write some text.
  • Read the content in the file and show it on the screen.

The beginning code for this recipe is the end of the previous one. The methods for reading and writing to files are included in the dart.io library. Follow these steps:

  1. At the top of the main.dart file, import the dart:io library:
import 'dart:io';
  1. At the top of the _MyHomePageState class, in the main.dart file, create two new State variables for the file and its content:
late File myFile;
String fileText='';
  • Still in the MyHomePageState class, create a new method...
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