Book Image

Flutter Cookbook

By : Simone Alessandria, Brian Kayfitz
4 (1)
Book Image

Flutter Cookbook

4 (1)
By: Simone Alessandria, Brian Kayfitz

Overview of this book

“Anyone interested in developing Flutter applications for Android or iOS should have a copy of this book on their desk.” – Amazon 5* Review Lauded as the ‘Flutter bible’ for new and experienced mobile app developers, this recipe-based guide will teach you the best practices for robust app development, as well as how to solve cross-platform development issues. From setting up and customizing your development environment to error handling and debugging, The Flutter Cookbook covers the how-tos as well as the principles behind them. As you progress, the recipes in this book will get you up to speed with the main tasks involved in app development, such as user interface and user experience (UI/UX) design, API design, and creating animations. Later chapters will focus on routing, retrieving data from web services, and persisting data locally. A dedicated section also covers Firebase and its machine learning capabilities. The last chapter is specifically designed to help you create apps for the web and desktop (Windows, Mac, and Linux). Throughout the book, you’ll also find recipes that cover the most important features needed to build a cross-platform application, along with insights into running a single codebase on different platforms. By the end of this Flutter book, you’ll be writing and delivering fully functional apps with confidence.
Table of Contents (17 chapters)
16
About Packt

How it works...

An AnimationController controls one or more animations. In this recipe, you’ve seen how to add a second animation to the same controller. This is extremely important as it allows you to change different properties of an object, with different values, which is what you will probably need in your apps most times.

The goal of this recipe was to separate the values for the left and top coordinates of the Ball object.

Consider the instructions:

animationLeft = Tween<double>(begin: 0, end: 200).animate(controller);
animationTop = Tween<double>(begin: 0, end: 400).animate(controller)
..addListener(() {
moveBall();
});

The two Tween animations, animationLeft and animationTop, interpolate the numbers from 0 to 200 and from 0 to 400, in the time specified in the AnimationController. This means that the vertical movement will be faster than the horizontal one, as during the same time frame the ball will cover twice the space vertically.