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Android
Recipes
A Problem-Solution Approach
—
Useful code snippets and recipes using
Android 7.0 and more
—
Fifth Edition
—
Dave Smith
Erik Hellman
Android Recipes
A Problem-Solution Approach
Fifth Edition
Dave Smith
Erik Hellman
Android Recipes: A Problem-Solution Approach
Dave Smith Erik Hellman
Littleton, Colorado, USA Sundbyberg, Sweden
ISBN-13 (pbk): 978-1-4842-2258-4 ISBN-13 (electronic): 978-1-4842-2259-1
DOI 10.1007/978-1-4842-2259-1
Library of Congress Control Number: 2016961316
Copyright © 2016 by Dave Smith and Erik Hellman
This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material
is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting,
reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval,
electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter
developed.
Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with every
occurrence of a trademarked name, logo, or image we use the names, logos, and images only in an editorial fashion
and to the benefit of the trademark owner, with no intention of infringement of the trademark.
The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified
as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.
The images of the Android Robot (01/Android Robot) are reproduced from work created and shared by Google and
used according to terms described in the Creative Commons 3.0 Attribution License. Android and all Android and
Google-based marks are trademarks or registered trademarks of Google Inc. in the United States and other countries.
Apress Media LLC is not affiliated with Google Inc., and this book was written without endorsement from Google Inc.
While the advice and information in this book are believed to be true and accurate at the date of publication, neither
the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be
made. The publisher makes no warranty, express or implied, with respect to the material contained herein.
Managing Director: Welmoed Spahr
Lead Editor: Steve Anglin
Technical Reviewer: Wallace Jackson
Editorial Board: Steve Anglin, Pramila Balan, Laura Berendson, Aaron Black, Louise Corrigan,
Jonathan Gennick, Robert Hutchinson, Celestin Suresh John, Nikhil Karkal, James Markham,
Susan McDermott, Matthew Moodie, Natalie Pao, Gwenan Spearing
Coordinating Editor: Mark Powers
Copy Editor: Mike
Compositor: SPi Global
Indexer: SPi Global
Artist: SPi Global
Distributed to the book trade worldwide by Springer Science+Business Media New York, 233 Spring Street,
6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer-sbm.com,
or visit www.springeronline.com. Apress Media, LLC is a California LLC and the sole member (owner) is Springer
Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.
For information on translations, please e-mail rights@apress.com, or visit www.apress.com.
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versions and licenses are also available for most titles. For more information, reference our Special Bulk Sales–eBook
Licensing web page at www.apress.com/bulk-sales.
Any source code or other supplementary materials referenced by the author in this text are available to readers
at www.apress.com/9781484222584. For detailed information about how to locate your book’s source code,
go to www.apress.com/source-code/. Readers can also access source code at SpringerLink in the Supplementary
Material section for each chapter.
Printed on acid-free paper
iii
Contents at a Glance
About the Authors �������������������������������������������������������������������������������������������������xxiii
About the Technical Reviewer �������������������������������������������������������������������������������xxv
Acknowledgments �����������������������������������������������������������������������������������������������xxvii
Introduction ����������������������������������������������������������������������������������������������������������xxix
■Chapter 1: Layouts and Views ������������������������������������������������������������������������������� 1
■Chapter 2: User Interaction Recipes �������������������������������������������������������������������� 85
■Chapter 3: Communications and Networking ���������������������������������������������������� 189
■Chapter 4: Interacting with Device Hardware and Media ���������������������������������� 259
■Chapter 5: Persisting Data ��������������������������������������������������������������������������������� 367
■Chapter 6: Interacting with the System ������������������������������������������������������������� 443
■Chapter 7: Graphics and Drawing ���������������������������������������������������������������������� 585
■Chapter 8: Working with Android NDK and RenderScript ���������������������������������� 655
Index ��������������������������������������������������������������������������������������������������������������������� 699
v
Contents
About the Authors �������������������������������������������������������������������������������������������������xxiii
About the Technical Reviewer �������������������������������������������������������������������������������xxv
Acknowledgments �����������������������������������������������������������������������������������������������xxvii
Introduction ����������������������������������������������������������������������������������������������������������xxix
■Chapter 1: Layouts and Views ������������������������������������������������������������������������������� 1
1-1. Styling Common Components ................................................................................... 1
Problem .................................................................................................................................................. 1
Solution...................................................................................................................................................1
How It Works ........................................................................................................................................... 1
1-2. Toggling System UI Elements .................................................................................. 10
Problem ................................................................................................................................................ 10
Solution.................................................................................................................................................11
How It Works ......................................................................................................................................... 11
1-3. Creating and Displaying Views................................................................................ 14
Problem ................................................................................................................................................ 14
Solution.................................................................................................................................................14
How It Works ......................................................................................................................................... 14
1-4. Animating a View .................................................................................................... 20
Problem ................................................................................................................................................ 20
Solution.................................................................................................................................................20
How It Works ......................................................................................................................................... 21
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