Back Button and Keyboard android

I'm actually having two problems:

• BackPressed takes the keyboard and buga from a command line, I do not know why. It pretty much ignores adappLista.notifyDataSetChanged() and does not make the change in my recyclerview list.

• The other problem involves the keyboard that goes from numeric to alphanumeric and is still locked. You can not use it.

if (lista.get(posicaoview).isLinhaselecionada()) {                                
lista.get(posicaoview).setLinhaselecionada(false);
adappLista.notifyDataSetChanged();}