How to call a third-party .so library in Java?

In Java, calling a third-party .so library requires using Java’s JNI (Java Native Interface) mechanism. Below are the steps for calling a third-party .so library.

1. You can load a .so library file into a Java program using the System.loadLibrary() method. For example:

System.loadLibrary("exampleLibrary");

1. Create a Java class with a native keyword to declare a native method that corresponds to a function in a .so library. For example:

public class NativeClass {
    public native void nativeMethod();
}

1. Generate a header file using the ‘javah’ command to connect native methods. For example:

javah -jni NativeClass

1. Write C/C++ code to implement native methods and call functions in a .so library. Compile the C/C++ code into a shared library (.so file).
2. Running the generated .so file together with the Java code allows you to call functions from the third-party .so library.

It is important to note that when invoking a third-party .so library, you need to map the data types between the Java code and C/C++ code based on the parameters and return value types of the required functions. Additionally, when calling functions in the .so library, ensure that the library file path is correct and the library file can be loaded.