1. For the local static method public static native String getStr(); corresponding to C/C++ code, there is no need to add the static keyword.

2. for static methods. The second parameter: jclass. indicates the calling class.

3. for non-static methods. The second parameter: jobject represents the class instance.

4. for multiple parameters.

Well, for example, if there are two ini, then they are: "(II)V"); One: "(I)V");

Here is an example

c/c++ code< /p>

JNIEXPORT jstring JNICALL Java_com_permadi_testjni_JNIDemo_getStr(JNIEnv *env,

jclass obj) {

jmethodID onMapSurfaceCreate = env->GetMethodID(obj, "fsum", "(II )V");

jobject mFileDescriptor = env->NewObject(obj, onMapSurfaceCreate);

env->CallVoidMethod(mFileDescriptor, onMapSurfaceCreate, 1, 2);

return env->NewStringUTF("I'm from C!");

}

java code:

import android.util.Log ;

public class JNIDemo {

// Local static method

public static native String getStr();

// Local method

public native int getCint(String str);

// Callback function

private void fsum( int i, int j){

}

static {

System.loadLibrary("TestJni");

}

}