Book Image

Android NDK: Beginner's Guide

By : Sylvain Ratabouil
Book Image

Android NDK: Beginner's Guide

By: Sylvain Ratabouil

Overview of this book

Related Content you might be interested in

Current Title:

Small book image
Android NDK: Beginner's Guide
Sylvain Ratabouil
Apr, 2015 | 494 pages
Small book image
Mastering Android NDK
Viktor Latypov | Sergey Kosarevsky
Sep, 2015 | 328 pages
Small book image
Asynchronous Android Programming
Helder Vasconcelos | Steve Liles
Jul, 2016 | 394 pages
Small book image
Android High Performance Programming
Emil Atanasov | Enrique Lpez Maas | Diego Grancini
Aug, 2016 | 412 pages
Table of Contents (18 chapters)
Android NDK Beginner's Guide Second Edition
Android NDK Beginner's Guide Second Edition
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Setting Up Your Environment
Setting Up Your Environment
Getting started with Android development
Time for action – preparing Windows for Android development
Time for action – installing Android SDK and NDK on Windows
Time for action – preparing OS X for Android development
Time for action – installing Android SDK and NDK on OS X
Time for action – preparing Ubuntu for Android development
Time for action – installing Android SDK and NDK on Ubuntu
Time for action – installing Eclipse with ADT on your OS
Time for action – creating an Android virtual device
Time for action – setting up an Android device
Summary
2
Starting a Native Android Project
Starting a Native Android Project
Building NDK sample applications
Time for action – compiling and deploying San Angeles sample
Creating your first native Android project
Time for action – creating a native Android project
Interfacing Java with C/C++
Time for action – calling C code from Java
Debugging native Android applications
Time for action – debugging a native Android application
Analyzing native crash dumps
Time for action – analyzing a native crash dump
Setting up a Gradle project to compile native code
Time for action – creating a native Android project
Time for action – using your own Makefiles with Gradle
Summary
3
Interfacing Java and C/C++ with JNI
Interfacing Java and C/C++ with JNI
Initializing a native JNI library
Time for action – defining a simple GUI
Time for action – initializing the native store
Converting Java strings in native code
Time for action – handling strings in the native store
Passing Java primitives to native code
Time for action – handling primitives in the native store
Referencing Java objects from native code
Time for action – saving references to Objects in native Store
Managing Java arrays
Time for action – handling Java arrays in native Store
Raising and checking Java exceptions
Time for action – raising & catching exceptions in native Store
Summary
4
Calling Java Back from Native Code
Calling Java Back from Native Code
Calling Java back from native code
Time for action – determining JNI method signatures
Time for action – calling back Java from native code
Time for action – allocating an object with JNI
Time for action – running and synchronizing a thread
Processing bitmaps natively
Time for action – decoding a camera's feed
Time for action – processing pictures with the Bitmap API
Summary
5
Writing a Fully Native Application
Writing a Fully Native Application
Creating a native Activity
Time for action – creating a basic native Activity
Handling Activity events
Time for action – stepping the event loop
Time for action – handling Activity events
Accessing window surface natively
Time for action – displaying raw graphics
Measuring time natively
Time for action – animating graphics with a timer
Summary
6
Rendering Graphics with OpenGL ES
Rendering Graphics with OpenGL ES
Initializing OpenGL ES
Time for action – initializing OpenGL ES
Time for action – clearing and swapping buffers
An insight into the OpenGL pipeline
Loading textures using the Asset manager
Time for action – reading assets with the Asset manager
Time for action – compiling and embedding libpng module
Time for action – loading a PNG image
Time for action – generating an OpenGL texture
Drawing 2D sprites
Time for action – initializing OpenGL ES
Rendering particle effects
Time for action – rendering a star field
Adapting graphics to various resolutions
Time for action – adapting resolution with off-screen rendering
Summary
7
Playing Sound with OpenSL ES
Playing Sound with OpenSL ES
Initializing OpenSL ES
Time for action – creating OpenSL ES engine and output
Playing music files
Time for action – playing background music
Playing sounds
Time for action – creating and playing a sound buffer queue
Recording sounds
Summary
8
Handling Input Devices and Sensors
Handling Input Devices and Sensors
Interacting with touch events
Time for action – handling touch events
Detecting keyboard, D-Pad, and Trackball events
Time for action – handling keyboard, D-Pad, and trackball events natively
Probing device sensors
Time for action – handling accelerometer events
Time for action – turning an Android device into a Joypad
Summary
9
Porting Existing Libraries to Android
Porting Existing Libraries to Android
Activating the Standard Template Library
Time for action – activating GNU STL in DroidBlaster
Time for action – read files with STL stream
Time for action – using STL containers
Porting Box2D to Android
Time for action – compiling Box2D on Android
Time for action – running Box2D physics engine
Prebuilding Boost on Android
Time for action – prebuilding Boost static library
Time for action – compiling an executable linked to Boost
Mastering module Makefiles
Summary
10
Intensive Computing with RenderScript
Intensive Computing with RenderScript
What is RenderScript ?
Executing a predefined Intrinsic
Time for action – creating a Java UI
Time for action – running RenderScript Blur intrinsic
Writing a custom Kernel
Time for action – writing a luminance threshold filter
Combining scripts together
Time for action – combining Intrinsics and scripts together
Summary
11
Afterword
Afterword
Where we have been
Where you can go
Where to find help
This is just the beginning
Index
Index

Calling Java back from native code

In the previous chapter, we discovered how to get a Java class descriptor with the JNI method FindClass(). However, we can get much more! Actually, if you are a regular Java developer, this should remind you of something: the Java Reflection API. JNI is similar in that it can modify Java object fields, run Java methods, and access static members, but from native code!

For this last part with the Store project, let's enhance our store application so that it notifies Java when an entry has been successfully inserted.

Note

The resulting project is provided with this book under the name Store_Part10.

Previous Section
End of Section 2
Next Section