Zhuinden

public class SomeActivity extends AppCompatActivity {
  Realm realm;
  
  @Override
  public void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    realm = Realm.getDefaultInstance();
  }
  
  @Override

Zhuinden

import android.content.Context;
import android.util.Log;

import io.realm.Realm;
import io.realm.RealmConfiguration;

/**
 * Created by Zhuinden on 2016.08.16..
 */
public class RealmManager {

Zhuinden

public class BooksScopeListener extends Fragment { // could go to base class
    public BooksScopeListener() {
        setRetainInstance(true);
        RealmManager.incrementCount();
    }

    @Override
    public void onDestroy() {
        RealmManager.decrementCount();
        super.onDestroy();

Zhuinden

public class GetNewsPostAsyncTask
        extends AsyncTask<Void, Void, Void> {
    private Retrofit retrofit;
    private ApiService apiService;

    private long postId;

    public GetNewsPostAsyncTask(Retrofit retrofit, ApiService apiService, long postId) {
        this.retrofit = retrofit;
        this.apiService = apiService;

Zhuinden

  adapter = new RealmRecyclerViewAdapter<NewsPost, NewsPostViewHolder>(getContext(), 
                  realm.where(NewsPost.class).findAllSortedAsync(NewsPostFields.MODIFIED, Sort.DESCENDING), true) { // query definition + true == automatic updates
    @Override
    public NewsPostViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
      return new NewsPostViewHolder(LayoutInflater.from(parent.getContext())
                                             .inflate(R.layout.view_news_post_item, parent, false));
    }

    @Override
    public void onBindViewHolder(NewsPostViewHolder holder, int position) {

Zhuinden

public void editPost(final DialogContract dialogContract, final long id) {
  Realm realm = RealmManager.getRealm(); // UI thread Realm, called via `onClick()` listener
  realm.executeTransactionAsync(new Realm.Transaction() {
    @Override
    public void execute(Realm realm) {
      NewsPost post = realm.where(NewsPost.class).equalTo(NewsPostFields.ID, id).findFirst(); 
                    // synchronous query by ID on background thread, inside transaction
      if(post != null) {
        post.setTitle(dialogContract.getTitle());
        //...

Zhuinden

public class NewsPost extends RealmObject {
    @PrimaryKey
    @Required
    private long id;
    
    // left nullable as default as example
    private String author;
    
    private String title;
    

Zhuinden

public class Post extends RealmObject implements Observable, RealmDataBinding {
    @PrimaryKey
    private long id;

    private String text;

    @Bindable
    public long getId() {
        return id;
    }

Zhuinden

public interface RealmDataBinding {
    interface Factory {
        RealmChangeListener create();
    }

    RealmDataBinding.Factory FACTORY = () -> element -> {
        if(element instanceof RealmDataBinding) {
            ((RealmDataBinding)element).notifyChange();
        }
    };

Zhuinden

public class MainActivity
        extends RealmActivity {
    Post post;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        post = realm.where(Post.class).equalTo("id", 1L).findFirst();