Instantiation of function QAndroidJniObject::callMethod<void> required here, but no definition is available

[vlada]

Hi,

I see a lot warnings like this when calling Java functions from C++. For example calling a function like this:

QtAndroid::androidService().callMethod<void>("myFunction");

On this line I see the warning Instantiation of function QAndroidJniObject::callMethod<void> required here, but no definition is available

What does it mean? I think the code is exactly like in the examples in Qt documentation.