Kotlin + RxJava2 + Dagger2 + Orma + Retrofit2 で作るAndroidアプリ at DroidKaigi 2017

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Kotlin + RxJava2 + Dagger2 + Orma  + Retrofit2 Ͱ࡞ΔAndroidΞϓϦ
@lvla0805

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MWMB MWMB Ѫᖒ๖ (Moyuru Aizawa) - Lead Kotlin engineer of
Pairs Div. Eureka, Inc.

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- Pairs - Couples - a member of IAC/Match Group

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Agenda ‣ Sample Application ‣ ٕज़֓ཁ ‣ Kotlin ‣ RxJava
‣ Retrofit ‣ Orma ‣ Sample ‣ Client ‣ Database ‣ Repository ‣ Activity ‣ Dagger2

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Sample Application

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‣ %SPJE,BJHJΞϓϦͷίϯ τϦϏϡʔλʔͷҰཡΛදࣔ͢ Δ͚ͩͷ؆୯ͳΞϓϦ Sample Application https://github.com/lvla/DroidKaigi2017Contributors

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‣ (JU)VC͔Βz%SPJE,BJHJDPOGFSFODFBQQzͷίϯ τϦϏϡʔλʔΛऔಘ͢Δ ‣ ΦϑϥΠϯͰ΋ίϯτϦϏϡʔλʔΛදࣔͰ͖ΔΑ͏ʹσʔ λϕʔεʹอଘ ‣ ʜ ඞཁͳػೳ

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ٕज़֓ཁ

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ٕज़֓ཁ Languages Kotlin 1.1 Network Retrofit 2.1.0 OkHttp 3.6.0 O/R
Mapper Orma 4.2.0 Reactive Programming RxJava 2.0.2 Dependency Injection Dagger 2.9

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build.gradle(Ұ෦) apply plugin: 'kotlin-android' apply plugin: 'kotlin-kapt' android { dataBinding
{ enabled = true } } dependencies { // Databinding kapt 'com.android.databinding:compiler:2.3.0' // Orma compile "com.github.gfx.android.orma:orma:$ormaVersion" kapt "com.github.gfx.android.orma:orma-processor:$ormaVersion" // ReactiveX compile 'io.reactivex.rxjava2:rxjava:2.0.2' compile 'io.reactivex.rxjava2:rxandroid:2.0.1' // Retrofit compile "com.squareup.retrofit2:retrofit:$retrofitVersion" compile "com.squareup.retrofit2:converter-gson:$retrofitVersion" compile 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0' compile "com.squareup.okhttp3:logging-interceptor:$okHttpVersion" // Dagger2 compile "com.google.dagger:dagger:$daggerVersion" kapt "com.google.dagger:dagger-compiler:$daggerVersion" }

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Kotlin

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‣ JetBrains։ൃͷJVM, Android޲͚੩తܕ෇͚ݴޠ ‣ Javaͱͷ100%૬ޓӡ༻ੑ ‣ ܕਪ࿦ ‣ Null҆શ ‣
ؔ਺Ϧςϥϧ Kotlin

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class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?) {
… val message = "Clicked" button.setOnClickListener { textView.text = message } } } Kotlin

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RxJava

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‣ ϦΞΫςΟϒϓϩάϥϛϯάϑϨʔϜϫʔΫ ‣ ؂ࢹՄೳͳStreamΛ࢖ͬͨඇಉظॲཧ RxJava

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RxJava val observable = Observable.create<Int> { subscriber -> intArray.forEach {
subscriber.onNext(it) } subscriber.onComplete() } observable.subscribe( { num -> println(num) }, { throwable -> throwable.printStackTrace() }, { println("onCompleted") })

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RxJava masterClient().fetch() .flatMap { loginClient.login() } .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.main()) .subscribe( {
... }, { ... }, { moveToMain() } )

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... }, { ... }, { moveToMain() } )

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... }, { ... }, { moveToMain() } )

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... }, { ... }, { moveToMain() } )

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... }, { ... }, { moveToMain() } )

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Retrofit

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‣ Square։ൃͷType Safe HTTP Client ‣ OkHttpͰ௨৴Λߦ͍ɺJsonΛ೚ҙͷܕͰฦ٫ͯ͘͠Ε Δɻ ‣ RxJavaରԠ
Retrofit

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Retrofitͷੜ੒

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Retrofit val retrofit = Retrofit.Builder() .client(OkHttpClient()) .baseUrl("https://api.github.com") .addCallAdapterFactory(RxJava2CallAdapterFactory.create()) .addConverterFactory(GsonConverterFactory.create()) .build()

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Gson, Jackson, Moshi...

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Interface

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Retrofit interface GitHubService { @GET("/repos/{owner}/{repo}/contributors") fun fetchContributors( @Path(“owner") owner: String,
@Path(“repo") repository: String): Observable<List<Contributor>> }

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Retrofit val gitHubService = retrofit.create(GitHubService::class.java) gitHubService.fetchContributors("Owner", "Repo") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe(
{ contributors -> show(contributors) }, { throwable -> throwable.printStackTrace() })

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‣ HTTP௨৴ͳͲɺΠϕϯτ͕Ұճ͔͠ى͜Βͳ͍ετ ϦʔϜΛѻ͏৔߹͸ObservableΑΓSingleͷ͕ϕλʔ ‣ ࠓճ͸આ໌Λ؆ུԽ͢ΔͨΊʹObservableΛ࢖༻͠· ͨ͠ɻ TIPS

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Orma

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‣ "OESPJE42-JUF%BUBCBTFΉ͚ͷ03. ‣ ίϯύΠϧ࣌ʹΞϊςʔγϣϯΛݩʹ$36%ͷϔϧύʔ ΫϥεΛੜ੒ͯ͘͠ΕΔɻ Orma

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Tableఆٛ

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Orma @Table data class Contributor( @PrimaryKey(auto = false) @Setter("name") val
name: String, @Column @Setter("avatarUrl") val avatarUrl: String?, @Column @Setter("htmlUrl") val htmlUrl: String?, @Column @Setter("contributions") val contributions: Int )

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OrmaDatabaseੜ੒

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Orma val orma = OrmaDatabase.builder(context) .writeOnMainThread(AccessThreadConstraint.FATAL) .readOnMainThread(AccessThreadConstraint.FATAL) .build()

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CRUD

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Insert orma.prepareInsertIntoContributor(OnConflict.REPLACE) .executeAll(contributors)

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Insert orma.transactionSync { orma.prepareInsertIntoContributor(OnConflict.REPLACE) .executeAll(contributors) }

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Insert orma.transactionAsCompletable { orma.prepareInsertIntoContributor(OnConflict.REPLACE) .executeAll(contributors) }

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Select orma.selectFromContributor() .executeAsObservable() .toList()

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Select orma.selectFromContributor() .nameEq("lvla") .executeAsObservable() .toList()

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Sample

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Client

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Client class GitHubClient(private val service: GitHubService) { fun fetchContributors(): Observable<List<Contributor>>
{ return service.fetchContributors(“DroidKaigi", "conference-app-2017") }

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Client class GitHubClient(private val service: GitHubService) { fun fetchContributors(): Observable<List<Contributor>>
{ return service.fetchContributors(“DroidKaigi", "conference-app-2017") }

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Dao

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Dao class ContributorDao(orma: OrmaDatabase) { fun insert(contributors: List<Contributor>) { orma.transactionSync
{ orma.prepareInsertIntoContributor(OnConflict.REPLACE) .executeAll(contributors) } } fun findAll(): List<Contributor> { return orma.selectFromContributor() .executeAsObservable() .toList() } }

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Repository

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Repository class ContributorRepository( private val client: GitHubClient, private val dao:
ContributorDao) { fun getContributors(): Observable<List<Contributor>> { return client.fetchContributors() .doOnNext { list -> dao.insert(list) } .onErrorReturn { dao.findAll() } } }

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Activity

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Activity class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) val retrofit = Retrofit.Builder().......build() val orma = OrmaDatabase.builder(context).......build() val service = retrofit.create(GitHubService::class.java) val client = ContributorClient(service) val dao = ContributorDao(orma) val repository = ContributorRepository(client, dao) repository.getContributors() .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { contributors -> showContributors(contributors) }, { Timber.e(it, "getContributors") } ) } }

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ґଘੑͷղܾ͸Dagger2 ʹ೚ͤΑ͏ɻ

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Dagger2

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‣ Google։ൃͷJava/Android޲͚DIίϯςφ ‣ ΞϊςʔγϣϯΛར༻ͨ͠ґଘੑͷղܾ ‣ ߴ଎ Dagger2

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ґଘੑͷάϥϑ Repository Dao Client Service Orma Context Retrofit OkHttp Activity

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ґଘੑͷղܾΛ͢Δͷʹඞཁͳ΋ͷ Injectee Component Module Inject͞ΕΔଆ Inject͢Δଆ ґଘੑͷఏڙऀ  (Inject͢Δ෺)

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Module @Module class ApplicationModule(private val applicationContext: App) { @Provides fun
provideContext(): Context {…} @Provides fun provideOkHttp(): OkHttpClient {…} @Provides fun provideRetrofit(o: OkHttpClient): Retrofit {…} @Provides fun provideOrma(c: Context): OrmaHolder {…} @Provides fun provide…Dao(oh: OrmaHolder): ContributorDao {…} @Provides fun provideGitHubService(r: Retrofit): GitHubService {…} @Provides fun provideGitHubClient(s: GitHubService): GitHubClient {…} }

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TIPS @Module class ApplicationModule(private val applicationContext: App) { @Provides fun

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‣ Constructor Injection ‣ SubComponent ‣ Include Module ‣ ….
TIPS

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Component @Singleton @Component(modules = arrayOf(ApplicationModule::class)) interface ApplicationComponent { fun inject(a:
MainActivity) }

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MainActivity) }

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MainActivity) }

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MainActivity) }

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Field Injection class MainActivity : AppCompatActivity() { @Inject lateinit var
repository: ContributorRepository }

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AnnotationProcessing Injectee Component Module Dagger2 ԿॲʹԿΛInject͢΂͖͔͕Θ͔Δ

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AnnotationProcessing Injectee Component Module Dagger2 ͜ͷComponent͕  ԿॲʹԿΛInjectͰ͖Δͷ͔͕Θ͔Δ

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AnnotationProcessing Injectee Component Module Dagger2 DaggerComponent Implement Dagger2͕Componentͷ࣮૷ΫϥεΛੜ੒

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ApplicationModule Repository Dao Client Service Orma Context Retrofit OkHttp Module

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ApplicationComponent Repository Dao Client Service Orma Context Retrofit OkHttp Module
Component

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ApplicationComponent Repository Dao Client Service Orma Context Retrofit OkHttp Activity
Inject Module Component

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Application class class App : Application() { lateinit var component:
ApplicationComponent override fun onCreate() { component = DaggerApplicationComponent.builder() .applicationModule(ApplicationModule(this)) .build() } }

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Application class class App : Application() { val component: ApplicationComponent
by lazy { DaggerApplicationComponent.builder() .applicationModule(ApplicationModule(this)) .build() } }

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MainActivity class MainActivity : AppCompatActivity() { @Inject lateinit var repository:
ContributorRepository override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) (application as App).component.inject(this) repository.getContributors().... } }

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Before class MainActivity : AppCompatActivity() { override fun onCreate(savedInstanceState: Bundle?)

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After class MainActivity : AppCompatActivity() { @Inject lateinit var repository:
ContributorRepository override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) (application as App).component.inject(this) repository.getContributors() .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe( { contributors -> showContributors(contributors) }, { Timber.e(it, "getContributors") } ) } }

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Conclusion

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‣ KotlinͰ৑௕ͳهड़ΛݮΒ͢ࣄ͕Ͱ͖Δ ‣ RxJavaͰॊೈͳΠϕϯτॲཧ/ඇಉظॲཧΛߦ͏͜ͱ͕ Ͱ͖Δ ‣ RetrofitͰHTTP௨৴ΛRxJavaͰѻ͑Δ ‣ OrmaʹSQLiteͷॲཧΛ೚ͤΒΕΔ ‣
Dagger2ʹґଘੑͷղܾΛҕৡͰ͖Δ Conclusion

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Thank you

Kotlin + RxJava2 + Dagger2 + Orma + Retrofit2 で作るAndroidアプリ at DroidKaigi 2017

Kotlin + RxJava2 + Dagger2 + Orma + Retrofit2 で作るAndroidアプリ at DroidKaigi 2017

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Kotlin + RxJava2 + Dagger2 + Orma + Retrofit2 で作るAndroidアプリ at DroidKaigi 2017

Kotlin + RxJava2 + Dagger2 + Orma + Retrofit2 で作るAndroidアプリ at DroidKaigi 2017