Do you have experience using JNI in projects?

JNI (Java Native Interface) is a mechanism that allows Java code to call native functions written in C or C++, and vice versa. In Android, this is useful when high-performance code needs to be used or when working with existing C/C++ libraries.

In JNI projects, native methods are usually created in a Java class, which are implemented in C/C++ through special header files. The NDK (Native Development Kit) is used to build native code.

Example of using JNI in Android:

public class NativeLib {
    static {
        System.loadLibrary("native-lib");
    }

    public native String stringFromJNI();
}

In C++, the function Java_com_example_NativeLib_stringFromJNI is implemented, which returns a string. This allows integrating native code into an Android application.

Experience with JNI includes setting up the build, writing and debugging native code, and interacting with the Java layer.