Android JNI call process analysis and RK3568 platform development

Android JNI call process analysis and RK3568 platform development

In Android development, JNI (Java Native Interface) is a mechanism for interacting between Java code and native code (such as C/C++). This article will explain the JNI calling process in detail, and provide corresponding source code examples based on the development of the RK3568 platform.

1. Preparatory work
   Before starting the JNI call, some preparatory work is required. First, you need to create a Java class with a Native method in the Android project to declare the native method to be called. Second, these methods need to be implemented in native code.

Here is an example Java class named NativeClass that declares a native method nativeMethod:

public class NativeClass {
   
    
    
    static {
   
    
    
        System.loadLibrary("native-lib"