package Ġcom . mar co sv br as . rob om ark et . app Ċ Ċ import Ġandroid . arch . lifecycle . ViewModel Ċ import Ġandroid . databinding . Observable Boolean Ċ import Ġandroid . databinding . Observable Field Ċ import Ġcom . mar co sv br as . rob om ark et . interfaces . Activity Callback Ċ Ċ abstract Ġclass ĠBase ViewModel Ġ: ĠViewModel () Ġ{ ĊĊĠĠĠ Ġval Ġtoolbar Title Ġ= ĠObservable Field < String >() ĊĠĠĠ Ġval ĠisLoading Ġ= ĠObservable Boolean ( false ) ĊĊĠĠĠ Ġabstract Ġfun Ġcleanup Subscriptions () Ċ Ċ }