Checking errors and handling exceptions in JNI

JNI functions can fail because of system constraint (for example, lack of memory) or invalid arguments (for example, passing a native UTF-8 string when the function is expecting a UTF-16 string). This recipe discusses how to handle errors and exceptions in JNI programming.

Getting ready

The following recipes should be read first before proceeding with this recipe:

• Manipulating strings in JNI

• Managing references in JNI

• Accessing Java static and instance fields in native code

• Calling static and instance methods from native code

How to do it…

Follow these steps to create a sample Android project that illustrates errors and exception handling in JNI:

1. Create a project named ExceptionHandling. Set the package name as cookbook.chapter2. Create an activity named ExceptionHandlingActivity. Under the project, create a folder named jni. Refer to the Loading native libraries and registering native methods recipe of this chapter for more detailed instructions...