NIEXPORT jstring JNICALL
Java_com_example_liyang_myapplication_MainActivity_stringFromJNI(
JNIEnv *env,
jobject jobj) {
int i=0;
//非静态属性
jclass clazz=env->GetObjectClass(jobj);
jfieldID jintid=env->GetFieldID(clazz,"anInt","I");
int a=25;
LOGE("%d",a);
env->SetIntField(jobj, jintid, a);
//静态属性
jfieldID js_intid=env->GetStaticFieldID(clazz,"s_anInt","I");
LOGE("%d %d",i++,env->GetStaticIntField(clazz,js_intid));
env->SetStaticIntField(clazz, js_intid,35);
LOGE("%d %d",i++,env->GetStaticIntField(clazz,js_intid));
//方法
jmethodID jsmid=env->GetMethodID(clazz,"temp","(I)I");
env->CallIntMethod(jobj, jsmid,56);
//静态方法
// stemp
jmethodID jsmi=env->GetStaticMethodID(clazz,"stemp","(ILjava/lang/String;)I");
jstring str=env->NewStringUTF("hello");
env->CallStaticIntMethod(clazz,jsmi,11,str);
//子类构造方法
jfieldID jsid=env->GetFieldID(clazz,"father","Lcom/example/liyang/myapplication/Father;");
jobject son1=env->GetObjectField(jobj, jsid);
jclass cls_son=env->GetObjectClass(son1);
jmethodID jomid=env->GetMethodID(cls_son,"drive","()V");
env->CallVoidMethod(son1, jomid,NULL);
//父类构造方法
jclass jfcls=env->GetSuperclass(cls_son);
jmethodID jfomid=env->GetMethodID(jfcls,"drive","()V");
env->CallNonvirtualVoidMethod(son1, jfcls, jfomid,NULL);
std::string hello ="Hello from C++";
return env->NewStringUTF(hello.c_str());
}
