ANDROID ARCHITECTURE WITH MVP AND CLEAN CODE Gérard Paligot 

INSTORE 

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PLANNING DOMYOS SAMPLE APP 

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SAMPLE APP LIBRAIRIES USED ▸ Kotlin ▸ Retrofit + OkHttp ▸ Picasso ▸ Timber ▸ Dagger ▸ RxJava 2 ▸ Room 

WHAT IS MVP AND CLEAN CODE? MVP 

interface ClubContracts { interface View { fun onClubsReceived(clubs: List) fun onError() } interface Presenter : KContracts.Presenter { } } 

class ClubPresenter( private val view: ClubContracts.View ) : ClubContracts.Presenter, KPresenter() { private fun load() { // ... view.onClubsReceived(it) } init { load() } } 

class ClubFragment : KFragment(), ClubContracts.View { override fun layout() = R.layout.fragment_clubs override fun inject(appComponent: AppComponent) { AndroidSupportInjection.inject(this) } override fun onClubsReceived(clubs: List) { // ... } override fun onError() { // ... } companion object { val TAG = "ClubFragment" fun newInstance(): Fragment { return ClubFragment() } } } 

abstract class KFragment : Fragment() { @Inject lateinit var presenter: T override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? { return inflater!!.inflate(layout(), container, false) } override fun onViewCreated(view: View?, savedInstanceState: Bundle?) { super.onViewCreated(view, savedInstanceState) inject(context.component) } @LayoutRes abstract fun layout(): Int abstract fun inject(appComponent: AppComponent) } 

WHAT IS MVP AND CLEAN CODE? CLEAN CODE 

WHAT IS MVP AND CLEAN CODE? CLEAN CODE 

MODELS 

data class ClubServiceModel( @SerializedName("id") val id: Int, @SerializedName("name") val name: String, @SerializedName("picture") val picture: String, @SerializedName("disable") val disable: Boolean, @SerializedName("address") val address: String, @SerializedName("postcode") val postcode: String, @SerializedName("city") val city: String, @SerializedName("mail") val mail: String, @SerializedName("phone") val phone: String? ) @Entity(tableName = "clubs") data class ClubDaoModel( @PrimaryKey val id: Int, val name: String, val picture: String, val address: String, val city: String, val mail: String, val phone: String?, @ColumnInfo(name = "created_at", index = true) val createdAt: Long ) 

data class Club( val id: Int, val name: String, val picture: String, val address: String, val city: String, val mail: String, val phone: String? ) open class ClubModelUi( val id: Int, val name: String, val pictureLink: String, val phoneLink: Uri, val mapLink: Uri, val mailLink: Uri ) 

class ClubModelUiMapper : Mapper { override fun to(from: Club): ClubModelUi = ClubModelUi( id = from.id, name = from.name, pictureLink = from.picture, phoneLink = if (from.phone != null) "tel:${from.phone}".toUri() else "".toUri(), mapLink = "https://www.google.com/maps/${from.address} ${from.city}".toUri(), mailLink = "mailto:${from.mail}".toUri() ) } 

USECASE 

class GetClubUseCase(private val repository: ClubRepository) { fun execute(): Single> { return repository.clubs() .toObservable() .flatMapIterable { it } .filter { it.id != 252 } .toList() } } 

class ClubRepositoryImpl( private val databaseSource: ClubDatabaseSource, private val serviceSource: ClubServiceSource ) : ClubRepository { override fun clubs(): Single> { return databaseSource.clubs() .toObservable() .filter { !it.isEmpty() } .switchIfEmpty(serviceSource.clubs() .doOnSuccess { databaseSource.saveClubs(it) } .toObservable()) .singleOrError() } } 

class ClubPresenter( private val view: ClubContracts.View, private val getClubUseCase: GetClubUseCase, private val clubMapper: Mapper, private val schedulers: KSchedulers) : ClubContracts.Presenter, KPresenter() { private fun load() { subscription.add(getClubUseCase.execute() .toObservable() .flatMapIterable { it } .map { clubMapper.to(it) } .toList() .subscribeOn(schedulers.newThread) .observeOn(schedulers.main) .subscribe({ view.onClubsReceived(it) }, { Timber.e(it) view.onError() }) ) } init { load() } } 

TESTS 

TESTS LIBRAIRIES USED ▸ JUnit ▸ AssertJ + AssertK ▸ Mockito + Mockito Kotlin ▸ Android Support Test 

class ClubUseCaseTest { private val repository: ClubRepository = mock() private lateinit var clubUseCase: ClubUseCase @Before fun setUp() { clubUseCase = ClubUseCase(repository) } // tests... } 

@Test fun shouldLoadClubs() { val clubExpected = Club(253, "Domyos Lille", "", "Professor Langevin", "Lille", "[email protected]", "0606060606") whenever(repository.clubs()).thenReturn(Observable.fromArray(clubExpected).toList()) val clubs = clubUseCase.execute().test().assertNoErrors().values().first() verify(repository).clubs() assert(clubs).hasSize(1) assert(clubs).containsExactly(clubExpected) } @Test fun shouldNotLoadClub252() { whenever(repository.clubs()).thenReturn(Observable.fromArray( Club(252, "Domyos Lille", "", "Professor Langevin", "Lille", "[email protected]", "0606060606")).toList()) val clubs = clubUseCase.execute().test().assertNoErrors().values().first() verify(repository).clubs() assert(clubs).isEmpty() } 

class ClubPresenterTest { private val view: ClubContracts.View = mock() private val repository: ClubRepository = mock() private val clubMapper: Mapper = mock() private val schedulers: KSchedulers = SchedulersTest() private lateinit var clubUseCase: ClubUseCase @Before fun setUp() { clubUseCase = ClubUseCase(repository) } // tests... } 

@Test fun shouldNotifyViewWhenUseCaseGiveUsListOfClubs() { val clubs = arrayListOf(Club(253, "Domyos Club", "", "", "", "", "")) val clubExpected: ClubModelUi = mock() whenever(repository.clubs()).thenReturn(Single.just(clubs)) whenever(clubMapper.to(clubs[0])).thenReturn(clubExpected) ClubPresenter(view, clubUseCase, clubMapper, schedulers) verify(view).onClubsReceived(arrayListOf(clubExpected)) } @Test fun shouldNotifyViewWhenAnErrorOccurred() { whenever(repository.clubs()).thenReturn(Single.error(Throwable())) ClubPresenter(view, clubUseCase, clubMapper, schedulers) verify(view).onError() } 

DEMO 

itcommunities.slack.com 

android-dev-france.slack.com 

ANDROID ARCHITECTURE WITH MVP AND CLEAN CODE twitter.com/ github.com/ GerardPaligot