Morris - Android user interface development ;quickly design and develop compelling user interfaces for your android applications: beginners guide
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Copyright 2011 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: February 2011
Production Reference: 1160211
Published by Packt Publishing Ltd.
32 Lincoln Road
Olton
Birmingham, B27 6PA, UK.
ISBN 978-1-849514-48-4
www.packtpub.com
Cover Image by Charwak A (<>)
Author
Jason Morris
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Jason Morris has worked on software as diverse as fruit tracking systems, insurance systems, and travel search and booking engines. He has been writing software for as long as he can remember. He is currently working as a Software Architect for Travelstart in South Africa. He works on multiple front-end and middleware systems, leveraging a variety of Java based technologies.
The people I'd like to thank most for their direct, or indirect help in writing this book are my wife Caron Morris, my father Mike Morris, my mom Jayne Morris, and the rest of my family for their love and support. I'd also like to thank Wayne, Stuart, Angela, and James, and everyone on my team at Travelstart. Finally a very big thanks to Martin Skans for his invaluable input.
Martin Skans graduated from Lund University in Sweden, with a Master's degree in Computer Science. After a couple of years in the online marketing industry, he moved on to become a developer for Travelstart, an online travel agency. He relocated to Cape Town and is currently working on Travelstart's African travel platform which has been recently launched for the mobile market.
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On 9th January, 2007, Apple officially launched the iPhone, and the world of user interface design shifted. While tablet PCs had been around for a while, the iPhone was the first device to give so many people a portable touchscreen, and people loved it. Just over a year later, Google and the Open Handset Alliance announced Android which in many ways is the direct competitor to iPhone.
What is it about touchscreen phones that we love? The answer is simplefeedback. Touchscreens offer a way to directly manipulate on-screen objects, which in the past had to be driven through a keyboard, mouse, joystick, or other input device. The touchscreen model of direct manipulation has a large impact on the way we think about our user interfaces as developers, and changes the expectations a user has for the application. Touchscreen devices require us to stop thinking in terms of forms, and start thinking about object-oriented user interfaces.
Android is used as the primary operating system for a rapidly expanding range of consumer electronics, including:
- Smartphones
- Netbooks
- Tablets
- Some desktop systems
While all of these devices have different purposes and specifications, all of them run Android. This is unlike many other operating environments which are almost always have a special purpose. The services and the APIs they provide to developers generally reflect their target hardware. Android on the other hand makes the assumption that a single application may be required to run on many different types of devices, with very different hardware capabilities and specifications, and makes it as easy as possible for developers to handle the differences between these devices simply and elegantly.
As Android and the touchscreen devices it powers become increasingly common, they will bring a new set of challenges to user interface design and development:
- You generally don't have a mouse
- You may have more than one pointing device
- You often don't have a keyboard
- Any keyboard that does exist may be a software keyboard
- A software keyboard may consume some of your application's screenspace
The software keyboard reduces the amount of screen space available to your application, and in much the same vein, if there is a hardware keyboard present it may or may not always be exposed to the user. Therefore, not only are different Android devices different, but they may also appear to change features while your application is running.
Most Android devices have touchscreens (although this is not a requirement). The first restriction placed on any touchscreen user interface is the size of the human forefinger, which of course varies widely from one person to another. If a widget is too small on the screen, it won't be clear what the user is trying to touch. You'll notice that most Android widgets take up plenty of space, and have more than the normal amount of padding around them. On a touchscreen device, you can't rely on pixel-perfect precision. You need to make sure that when the user touches a widget, they make contact, and they don't accidentally touch another widget.
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