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Android NDK Beginner`s Guide - Second Edition

You're reading from   Android NDK Beginner`s Guide - Second Edition Discover the native side of Android and inject the power of C/C++ in your applications

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Product type Paperback
Published in Apr 2015
Publisher Packt
ISBN-13 9781783989645
Length 494 pages
Edition 1st Edition
Languages
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Author (1):
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Sylvain Ratabouil Sylvain Ratabouil
Author Profile Icon Sylvain Ratabouil
Sylvain Ratabouil
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Table of Contents (13) Chapters Close

Preface 1. Setting Up Your Environment FREE CHAPTER 2. Starting a Native Android Project 3. Interfacing Java and C/C++ with JNI 4. Calling Java Back from Native Code 5. Writing a Fully Native Application 6. Rendering Graphics with OpenGL ES 7. Playing Sound with OpenSL ES 8. Handling Input Devices and Sensors 9. Porting Existing Libraries to Android 10. Intensive Computing with RenderScript 11. Afterword Index

Referencing Java objects from native code


We know from the previous section that a string is represented in JNI as jstring, which is in fact a Java object, which means that it is possible to exchange any Java object through JNI! However, because native code cannot understand or access Java directly, all Java objects have the same representation, jobject.

In this part, we will focus on how to save an object on the native side and how to send it back to Java. As an example, we will work with a custom object Color, although any other type of object would work too.

Note

The resulting project is provided with this book under the name Store_Part7.

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