OnClickedListener and multiple buttons

Hi

It is unclear in java examble (qml_in_java_based_android_project) how to add second button to QML view. How this listener should work with multiple buttons ? 

m_mainQmlComponent.connectOnClickedListener(
                    (String name, Void v)

Now content of name is always "onClicked" (name of signal?)

This warning is in logcat.
W libqml_in_android_view_arm64-v8a.so: Mismatching argument types between QML signal (onClicked()) and the Java function (java/lang/Object). Sending null as argument.

Something wrong in QML or Java side?

This documentation is different as example project 
https://doc.qt.io/qt-6/qml-in-android-studio-projects-example.html

Should I use connectSignalListener or connectOnClickedListener?