How to resolve this warning

mrdebug

Hi, this line of code

QtAndroid::androidActivity().callMethod<void>("Init", "()V");

causes the warning

warning: instantiation of function 'QAndroidJniObject::callMethod<void>' required here, but no definition is available
note: forward declaration of template entity is here
note: add an explicit instantiation declaration to suppress this warning if 'QAndroidJniObject::callMethod<void>' is explicitly instantiated in another translation unit

How can I to resolve it?

fcarney

QtAndroid::androidActivity().callMethod<jvoid>("Init", "()V");

Does this work?

Edit:
https://cdn2-ecros.pl/event/codedive/files/presentations/2017/code%20dive%202017%20-%20Michal%20Los%20-%20When%20C%2B%2B%20wants%20to%20meet%20Java.pdf

mrdebug

undeclared indentifier jvoid

fcarney

@mrdebug said in How to resolve this warning:

QtAndroid:

Wait, this is a warning and not an error?
Maybe a declaration to satisfy the template?:

void QAndroidJniObject::callMethod(const char *methodName, const char *sig, ...) const;

I don't know if that is the right sig though:
https://doc.qt.io/qt-5/qandroidjniobject.html#callMethod-1