Passing Java primitives to native code
by Sylvain Ratabouil
Android NDK Beginner's Guide - Second Edition
- Android NDK Beginner's Guide Second Edition
- Table of Contents
- Android NDK Beginner's Guide Second Edition
- Credits
- About the Author
- About the Reviewers
- www.PacktPub.com
- Preface
- 1. Setting Up Your Environment
- Time for action – installing Android SDK and NDK on Ubuntu
- Time for action – creating an Android virtual device
- Time for action – setting up an Android device
- Summary
- 2. Starting a Native Android Project
- Creating your first native Android project
- Time for action – creating a native Android project
- Interfacing Java with C/C++
- 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
- 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
- Summary
- Time for action – determining JNI method signatures
- Time for action – calling back Java from native code
- Time for action – running and synchronizing a thread
- Processing bitmaps natively
- Time for action – decoding a camera's feed
- Summary
- 5. Writing a Fully Native Application
- Summary
- 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
- Rendering particle effects
- Adapting graphics to various resolutions
- Time for action – adapting resolution with off-screen rendering
- 7. Playing Sound with OpenSL ES
- 8. 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
- Time for action – read files with STL stream
The simplest kinds of elements we can handle with JNI are Java primitive types. Indeed, both the Java and native side use practically the same representation for this kind of data which, does not require any specific memory management.
In this part, we will see how to pass integers to the native side and send them back to the Java side.
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