@JoeCFD Thank you for your answer, but that was exactly what I had done - tried and tried all over again. The solution came now with vigorously erasing all of AndroidSDK, upgrading Creator. Now it works!! I'll probably never know why it didn't before. :-)

@Kevin470
The qt_standard_project_setup function doesn't set CMAKE_AUTORCC flag, only UIC and MOC. So you need to add:

set(CMAKE_AUTORCC ON)

before calling qt_add_executable.