oznus

public class FetchingJsonActivity extends AppCompatActivity {

    @Inject
    UserService userService;
    private UserView someView;
    private Subscription subscription;

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

oznus

 userService.getUser().enqueue(new Callback<User>() {
            @Override
            public void onResponse(Call<User> call, Response<User> response) {
                User user = response.body();
                if (userView != null) {
                  userView.populate(user);
                }
            }

oznus

  public class FetchingJsonActivity extends AppCompatActivity {

    @Inject
    UserService userService;
    UserView someView;

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

oznus

public class LazySingleton {

     private static class Loader {
         static volatile LazySingleton INSTANCE = new LazySingleton();
     }

     private LazySingleton () {}

     public static LazySingleton getInstance() {
         return Loader.INSTANCE;

oznus

public class LazySingleton {

    private LazySingleton() {
    }

    private static volatile LazySingleton sInstance;

    public static LazySingleton INSTANCE() {

        if  (sInstance == null) {

oznus

public class LazySingleton {

    private LazySingleton() {
    }

    private static LazySingleton sInstance;

    public static LazySingleton INSTANCE() {

oznus

public class LazySingleton {

    private LazySingleton() {
    }

    private static LazySingleton sInstance;

    public static LazySingleton INSTANCE() {
        
        synchronized (LazySingleton.class) {

oznus

public class LazySingleton {

    private LazySingleton() {
    }

    private static LazySingleton sInstance;

    public static LazySingleton INSTANCE() {

        if (sInstance == null) {

oznus

//Create all Retrofit stuff..
RestAdapter restAdapter = new RestAdapter.Builder()
    .setEndpoint("https://api.myserver.com")
    .build();
MyService service = restAdapter.create(MyService.class);

//Fetch the user from the api
User user = service.getUser("432947");

//Save it to realm

oznus

public interface MyService {
  @GET("/users/{user}")
  User getUser(@Path("user") String user);
}