Unsolved Android: This plugin does not support grabbing the keyboard

[xtingray]

Hi,
Currently I am developing a little form dialog using QWidgets for an Android app. When the form is opened this message appears in the QtCreator log:

W/libApp.so(16322): (null):0 ((null)): This plugin does not support grabbing the keyboard

And If I try to edit any of the form fields, the Android keyboard show up but I doesn't work, then this message appears in the log:

QMetaObject::invokeMethod: No such method QMainWindow::inputMethodQuery(Qt::InputMethodQuery,QVariant)

I have been looking for an example of how to deal with this issue in the right way.
Any advice is very welcome!