D:\androidMyWork\SmartCam\app\build\intermediates\classes\debug>javap -s com.admin.smartcam.javatoc.JavaToC

Compiled from "JavaToC.java"

public class com.admin.smartcam.javatoc.JavaToC {

  public com.admin.smartcam.javatoc.JavaToC();

    descriptor: ()V //这就是签名

  public native boolean FaceDetecter(byte[]);

    descriptor: ([B)Z  //这就是签名

}

D:\androidMyWork\SmartCam\app\build\intermediates\classes\debug>com.admin.smartcam.javatoc.JavaToC

    //C调用JAVA

    //1、得到字节码

    char *string = "com/admin/smartcam/javatoc/JavaToC";//字节码  要调用的java类的全类名

    jclass jclazz = (*env)->FindClass(env, string);//com.admin.smartcam.javatoc.JavaToC

    //2、得到对应的方法

    jmethodID jID=(*env)->GetMethodID(env,jclazz,"JavaloveC", "()V");//第四个参数为方法签名

    //3、实例化JNI

    // 类

    jobject jobj=(*env)->AllocObject(env,jclazz);

    //4、调用方法

    (*env)->CallVoidMethod(env,jobj,jID);