package Ġkr . hs . dg sw . db ook . Book List Ċ Ċ interface ĠOn Change Fragment Listener Ġ{ ĊĠĠĠ Ġfun Ġchange To Book Detail ( book Id : ĠString ) ĊĊĠĠĠ Ġfun Ġchange To Category Detail ( categoryId : ĠString ) Ċ }