android - Access Recyclerview viewholder from activity -

i'm developing music player app android. when song completes send broadcast , in activity want change play/pause icon in row accordingly.

the activity receives broadcast of next song don't know how update row activity.

protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_now_playing);          mstaggergridlayoutmanager = new staggeredgridlayoutmanager(1, staggeredgridlayoutmanager.vertical);          mrecyclerview = (recyclerview) findviewbyid(r.id.now_playing_songs_list);         mrecyclerview.setlayoutmanager(mstaggergridlayoutmanager);         madapter = new listadapter(this, msonglist)         mrecyclerview.setadapter(madapter);         mreciever = new broadcastreceiver() {             @override             public void onreceive(context context, intent intent) {                 if(intent.getaction().equals(musicservice.song_finished)) {                     //want change row icon here                 }             }         }; 

how access viewholder defined inside madapter in activity?

you must change model activity , ask adapter update view. single responsibility 1 of oop design principles. example song objects must have boolean value name isplaying. when user playing song must set true. when receive broadcast find song list , set boolean false , call madapter.notifydatasetchanged(). in getview method check variable , set ui pause or play state.