QML signals to C++? No, the other way around please

While developing an application with QML and C++ please refrain to emit signals in QML that should be handled by C++ code. Just the opposite, keep QML as the UI layer and expose your C++ object to QML (as a context property or with qmlRegisterXXX) and then call a slot or a Q_INVOKABLE method of this object from QML.

Qt on Android: running C++ code on Android UI thread

From BogDan Vatra, the man behind Qt creating Android apps, I found this interesting post about easily running C++ code on Android UI thread.