问如何使用JNI将双精度和无符号int从本机c++库返回到java。

EN

Error:(111, 37) error: called object type 'double' is not a function or function pointer
Error:(117, 43) error: called object type 'unsigned int' is not a function or function pointer
Error:(220, 19) error: functions that differ only in their return type cannot be overloaded

double SuperpoweredExample::getPosition() {

    double pos = playerA->positionMs();

    return pos;
}

unsigned int SuperpoweredExample::getDuration() {
    unsigned int dur = playerA->durationMs();
    return dur;
}

JNIEXPORT jdouble Java_com_superpowered_crossexample_MainActivity_getPosition(JNIEnv *javaEnvironment, jobject self) {

    return example->getPosition();
}
JNIEXPORT jint Java_com_superpowered_crossexample_MainActivity_getDuration(JNIEnv *javaEnvironment, jobject self) {
    return example->getDuration();
}