Programming with the jnigraphics library in Android NDK

The jnigraphics library provides a C-based interface for native code to access the pixel buffers of Java bitmap objects, which is available as a stable native API on Android 2.2 system images and higher. This recipe discusses how to use the jnigraphics library.

Getting ready…

Readers are expected to know how to create an Android NDK project. We can refer to the Writing a Hello NDK program recipe of Chapter 1, Hello NDK for detailed instructions.

How to do it...

The following steps describe how to create a simple Android application which demonstrates the usage of the jnigraphics library:

1. Create an Android application named JNIGraphics. Set the package name as cookbook.chapter7.JNIGraphics. Refer to the Loading native libraries and registering native methods recipe of Chapter 2, Java Native Interface for more detailed instructions.

2. Right-click on the project JNIGraphics, select Android Tools | Add Native Support.

3. Add two Java files named MainActivity...