Realm detail view start (Activity)

realm-detail-view-example.java

public class NewsActivity extends AppCompatActivity {
  // ...
  private RealmChangeListener<RealmResults<NewsPost>> realmChangeListener;
  private RealmResults<NewsPost> listenerSet;
  private long postId;
  
  private Realm realm;

  @Override
  protected void onCreate(Bundle bundle) {
    super.onCreate(bundle);
    Injector.get().inject(this);
    postId = getIntent().getLongExtra("postId");
    setContentView(R.layout.activity_news);
    ButterKnife.bind(this);
    
    realm = RealmManager.getRealm();
      
    realmChangeListener = new RealmChangeListener<RealmResults<NewsPost>>() {
      @Override
      public void onChange(RealmResults<NewsPost> element) {
        NewsPost newsPost = realm.where(NewsPost.class)
                                    .equalTo(NewsPostFields.ID, postId)
                                    .findFirst();
        if(newsPost != null) { // if news post was downloaded on background thread, initalize view
          initView(newsPost);
        }
      }
    };
    listenerSet = realm.where(NewsPost.class)
                       .findAll();
    listenerSet.addChangeListener(realmChangeListener); // listen to changes in `NewsPost` table
    
    NewsPost newsPost = realm.where(NewsPost.class)
                                .equalTo(NewsPostFields.ID, postId)
                                .findFirst();
    if(newsPost == null) {
      // download news post if not available
      getNewsPostInteractor.getNewsPost(postId);
    } else {
      initView(newsPost);
    }
  }
  
  private void initView(NewsPost newsPost) {
    // set views
  }
}