How Android NDK avoids the JAVA_XXX standard definition

Java code: public class messageutil {static{system.loadlibrary ("SMS");} Public static native void showtoast (object context,string message);} JNI code: File  -- sms.h//// created by mrper on 2015/8/2.//#include  < Jni.h> #ifndef  sender_sms_h#define sender_sms_hvoid showtoast (jnienv *env,jclass  Clazz,jobject handler,jstring message); Static jint registenativemethods (JNIEnv *env, Const char* classname,jninativemethod *methods,int nummethod);static jint  Registenatives (jnienv *env); #endif  //sender_sms_h file  -- sms.cpp//// created by  mrper on 2015/8/2.//#include   "Sms.h" #include  <stdio.h>static  jninativemethod nativemethods[] = {{"Showtoast", "(Ljava/lang/object; ljava/lang/string;) V ", (void*) showtoast}};void showtoast (JNIENV&NBSP;*ENV,JCLASS&NBSP;CLAZZ,JOBJECT&NBsp;handler,jstring message) {jclass cls_toast = env->findclass ("android/widget/Toast"); Jmethodid mid_showtoast = env->getstaticmethodid (Cls_toast, "MakeText", "(Landroid/content/ Context; Ljava/lang/charsequence;i) landroid/widget/toast; "); Jobject obj_toast = env->callstaticobjectmethod (cls_toast,mid_showtoast,handler,message,1000 ); Jmethodid mid_show = env->getmethodid (Cls_toast, "Show", "() V"); Env->callvoidmethod (obj_ Toast,mid_show);} Static jint registenativemethods (Jnienv *env,const char* classname,jninativemethod  *methods,int nummethod) {jclass clazz;clazz = env->findclass (className);if  ( Clazz == null)  return JNI_FALSE;if  (env->registernatives (Clazz,methods,nummethod)  < 0) {return jni_false;} Return jni_true;} Static jint registenatives (jnienv *env) {if  (Registenativemethods (env), "Com/mrper/sender/messageutil ", nativemethods,sizeof (NativeMethods)/sizeof (Nativemethods[0])  )  != jni_true ) {Return jni_false;} Return jni_true;} Jint jni_onload (javavm *vm, void*reserved) {jint result = -1; Jnienv *env;vm->getenv ((void**) &env,jni_version_1_6);if  (env == null) {goto  Fail;} if  (registenatives (env)  != jni_true) {goto fail;} Result = jni_version_1_6;fail:return result;}

How Android NDK avoids the JAVA_XXX standard definition