Apress Pro Android Apps Performance Optimization (2012).pdf

Pro Android Apps

Performance

Optimization

■ ■ ■

Hervé Guihot

Pro Android Apps Performance Optimization

means, electronic or mechanical, including photocopying, recording, or by any information

storage or retrieval system, without the prior written permission of the copyright owner and the

publisher.

ISBN-13 (pbk): 978-1-4302-3999-4

ISBN-13 (electronic): 978-1-4302-4000-6

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intention of infringement of the trademark.

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 U.S. and other countries. Apress Media, L.L.C. is not

affiliated with Google, Inc., and this book was written without endorsement from Google, Inc.

The use in this publication of trade names, trademarks, service marks, and similar terms, even if

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they are subject to proprietary rights.

President and Publisher: Paul Manning

Lead Editor: James Markham

Technical Reviewer: Charles Cruz, Shane Kirk, Eric Neff

Editorial Board: Steve Anglin, Mark Beckner, Ewan Buckingham, Gary Cornell, Morgan Ertel,

Jonathan Gennick, Jonathan Hassell, Robert Hutchinson, Michelle Lowman,

James Markham, Matthew Moodie, Jeff Olson, Jeffrey Pepper, Douglas Pundick,

Ben Renow-Clarke, Dominic Shakeshaft, Gwenan Spearing, Matt Wade, Tom Welsh

Coordinating Editor: Corbin Collins

Copy Editor: Jill Steinberg

Compositor: MacPS, LLC

Indexer: SPi Global

Artist: SPi Global

Cover Designer: Anna Ishchenko

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source code, go to http://www.apress.com/source-code/ .

Contents at a Glance

Contents ............................................................................................................. iv

About the Author.............................................................................................. viii

About the Technical Reviewers ......................................................................... ix

Acknowledgments .............................................................................................. x

Introduction ....................................................................................................... xi

■ Chapter 1: Optimizing Java Code .................................................................... 1

■

Chapter 2: Getting Started With the NDK ....................................................... 33

■ Chapter 3: Advanced NDK.............................................................................. 73

■

Chapter 4: Using Memory Efficiently ........................................................... 109

■ Chapter 5: Multithreading and Synchronization ......................................... 133

■

Chapter 6: Benchmarking And Profiling...................................................... 163

■ Chapter 7: Maximizing Battery Life ............................................................. 177

■

Chapter 8: Graphics..................................................................................... 207

■ Chapter 9: RenderScript .............................................................................. 231

Index ............................................................................................................... 265

iii

Contents

Contents at a Glance.......................................................................................... iii

About the Author.............................................................................................. viii

About the Technical Reviewers ......................................................................... ix

Acknowledgments .............................................................................................. x

Introduction ....................................................................................................... xi

■

Chapter 1: Optimizing Java Code .................................................................... 1

How Android Executes Your Code ........................................................................................................................... 2

Optimizing Fibonacci .............................................................................................................................................. 4

From Recursive To Iterative ............................................................................................................................... 5

BigInteger .......................................................................................................................................................... 6

Caching Results .................................................................................................................................................... 11

android.util.LruCache<K, V>............................................................................................................................ 12

API Levels ............................................................................................................................................................. 13

Fragmentation .................................................................................................................................................. 16

Data Structures ..................................................................................................................................................... 17

Responsiveness .................................................................................................................................................... 20

Lazy initializations ........................................................................................................................................... 22

StrictMode ....................................................................................................................................................... 23

SQLite ................................................................................................................................................................... 25

SQLite Statements ........................................................................................................................................... 25

Transactions .................................................................................................................................................... 28

Queries ............................................................................................................................................................. 30

Summary .............................................................................................................................................................. 31

■

Chapter 2: Getting Started With the NDK ....................................................... 33

What Is In the NDK? .............................................................................................................................................. 34

Mixing Java and C/C++ Code ............................................................................................................................... 37

Declaring the Native Method ........................................................................................................................... 37

Implementing the JNI Glue Layer..................................................................................................................... 38

Creating the Makefiles..................................................................................................................................... 40

Implementing the Native Function ................................................................................................................... 41

Compiling the Native Library............................................................................................................................ 43

Loading the Native Library ............................................................................................................................... 43

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