realm adapter.java

private void init() {

    mAllEntriesAdapter = new AllEntriesRecyclerAdapter(AllEntriesActivity.this, mEntries, mAllEntriesRecyclerView);
    mAllEntriesLayoutManager = new StaggeredGridLayoutManager(mNumColumns, StaggeredGridLayoutManager.VERTICAL);
    mAllEntriesRecyclerView.setLayoutManager(mAllEntriesLayoutManager);
    mAllEntriesRecyclerView.setAdapter(mAllEntriesAdapter);

    RealmQuery<Entry> entriesQuery = mRealm.where(Entry.class);
    RealmResults<Entry> entriesResults = entriesQuery.findAll();

    if (entriesResults.size() == 0) {
      Util.showCustomToast(AllEntriesActivity.this, R.string.no_entries_to_show_toast);
    }

    List<Entry> entries = new ArrayList<>(entriesResults);

    Entry.sortEntries(entries);

    for (Entry e : entries) {
      mEntries.add(0, e);
    }
    if (entries.size() > 0) {
      mAllEntriesAdapter.notifyDataSetChanged();
    }

  }