JNIEXPORT void JNICALL Java_com_cjz_mapscr_MapScreen_drawLines (JNIEnv *env, jobject thiz) {
	jclass clazz_date = (*env)->FindClass(env, "java/util/Date");
	jmethodID mid_date = (*env)->GetMethodID(env, clazz_date, "<init>", "()V");
	jobject now = (*env)->NewObject(env, clazz_date, mid_date);
	jmethodID mid_date_getTime = (*env)->GetMethodID(env, clazz_date, "getTime" , "()J");
	jlong time = (*env)->CallLongMethod(env, now, mid_date_getTime);
	LOGI("JNI TIME : %ld\n", time);
}