AungThiha

public interface PromotionService {

  @GET("/promotions")
  Observable<List<Promotion>> fetchPromotions();

  @GET("/promotions/{promotion_id}/sales")
  Observable<List<Sale>> fetchSales(@Path("promotion_id") long promotionId);

  @GET("/promotions/{promotion_id}/ads")
  Observable<List<Ad>> fetchAds(@Path("promotion_id") long promotionId);

AungThiha

public class PromotionRepository {

  private PromotionService promotionService;

  @Inject
  public PromotionRepository(PromotionService promotionService) {
    this.promotionService = promotionService;
  }
  
  public Observable<List<Promotion>> fetchPromotions(){

AungThiha

public class Optional<M> {

  /**
   * Common instance for {@code empty()}.
   */
  private static final Optional<?> EMPTY = new Optional<>(null);

  private final M value;

  public Optional(@Nullable M value) {

AungThiha

public interface PromotionService {

  @GET("/promotions")
  Observable<Response<List<Promotion>>> fetchPromotions();

  @GET("/promotions/{promotion_id}/sales")
  Observable<Response<List<Sale>>> fetchSales(@Path("promotion_id") long promotionId);

  @GET("/promotions/{promotion_id}/ads")
  Observable<Response<List<Ad>>> fetchAds(@Path("promotion_id") long promotionId);

AungThiha

public class PromotionPresenter implements PromotionContract.Presenter {
  
  PromotionContract.View view;
  PromotionRepository repository;
  
  private CompositeDisposable disposeBag;
  
  @Inject
  public PromotionPresenter(PromotionRepository repository){
    this.repository = repository;

AungThiha

public class PromotionPresenter implements PromotionContract.Presenter {

  PromotionContract.View view;
  PromotionRepository repository;

  private CompositeDisposable disposeBag;

  @Inject
  public PromotionPresenter(PromotionRepository repository){
    this.repository = repository;

AungThiha

public class PromotionRepository {

  private PromotionService promotionService;

  @Inject
  public PromotionRepository(PromotionService promotionService) {
    this.promotionService = promotionService;
  }

  public Observable<Optional<List<Promotion>>> fetchPromotions(){

AungThiha

import io.reactivex.android.plugins.RxAndroidPlugins
import io.reactivex.plugins.RxJavaPlugins
import io.reactivex.schedulers.Schedulers
import okhttp3.MediaType
import okhttp3.ResponseBody
import org.junit.Before
import org.junit.Test
import org.mockito.ArgumentMatchers.any
import org.mockito.Mock
import org.mockito.Mockito

AungThiha

{
  ConstraintSets: {
    start: {
      headerImage: {
        width: "spread",
        height: 250,
        top: ['parent', 'top'],
        start: ['parent', 'start'],
        end: ['parent', 'end'],
        translationY: 0,

AungThiha

class MainActivity : ComponentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContent {
            MyApplicationTheme {
                // A surface container using the 'background' color from the theme
                Surface(
                    modifier = Modifier.fillMaxSize(),
                    color = MaterialTheme.colorScheme.background
                ) {