package Ġcom . ch he msr ong long . together . Common Ċ Ċ import Ġandroid . arch . lifecycle . ViewModel Ċ import Ġcom . google . android . gms . tasks . On Failure Listener Ċ Ċ abstract Ġclass ĠBase ViewModel ( protected Ġval Ġon Failure Listener : ĠOn Failure Listener ) Ġ: ĠViewModel ()