Hello,
Firstly i want to thank you for implementing this great application. Incognito mode is awesome and i think it should stay as default, because this way even if third part knows my login it can't hack master password - in this mode app simply doesn't know which one is real. Another option is to allow saved user to login like in incognito mode, i.e. with any password. This way this app becomes a way safer and unique. I have tried to make it on my own, but i stuck on importing project to IDE(tried both Netbeans and Android Studio).
Best wishes, Vitaly