public ThreadOverviewItemKeyProvider(ThreadOverviewAdapter adapter) {
    super(ItemKeyProvider.SCOPE_MAPPED);
    this.threadOverviewAdapter = adapter;
}
 

ItemKeyProviderMessage(RecyclerView recyclerView) {
    super(ItemKeyProvider.SCOPE_CACHED);
    this.recyclerView = recyclerView;
}
 

KeyProvider(RecyclerView.Adapter<RecyclerView.ViewHolder> adapter) {
  super(ItemKeyProvider.SCOPE_MAPPED);
}