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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

Proportional spacing with the Flexible and Expanded widgets

Today, almost every device has a different height and width. Some devices also have a notch at the top of the screen that insets into the available screen space. In short, you cannot assume that your app will look the same on every screen——your user interfaces have to be flexible.

In this recipe, we will demonstrate two ways to develop proportional widgets: Flexible and Expanded widgets.

Getting ready

You should have completed the project in the previous recipe before starting this one.

Create a new Dart file called flex_screen.dart and create the requisite StatelessWidget subclass called FlexScreen. Also, just like the last recipe, replace the home property in main.dart with FlexScreen.

How to do it...

Before we can show off Expanded and Flexible, we need to create a simple helper widget:

  1. Create a new file, called labeled_container.dart, and import material.dart.
  2. ...
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