GUIアプリケーションの構造と設計

Presented at Hatena Engineer Seminar #9

https://hatena.connpass.com/event/69844/

1. (6*ΞϓϦέʔγϣϯͷߏ଄ͱઃܭ
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11. %BUB
    #JOEJOH <layout xmlns:android="http://schemas.android.com/apk/res/android"> <data> <import type="jp.ne.hatena.myapplication.entry.Entry"/> <variable name="entry" type="Entry"/> </data> <android.support.constraint.ConstraintLayout android:layout_width="match_parent" android:layout_height="wrap_content"> <TextView android:id="@+id/titleView" android:text="@{entry.title}" .../> <TextView android:id="@+id/bodyView" android:text="@{entry.body}" .../> ... </android.support.constraint.ConstraintLayout> </layout>
12. %BUB
    #JOEJOH class EntryViewHolder(private val binding: EntryItemBinding): RecyclerView.ViewHolder(binding.root) { companion object { fun create(parent: ViewGroup) = EntryViewHolder( EntryItemBinding.inflate(LayoutInflater.from(parent.context), parent, false) ) } fun bindTo(entry: Entry?) { binding.entry = entry } }
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14. 3PPN @Entity(tableName = "entry", indices = arrayOf( Index(value = "date") )) data class Entry( @PrimaryKey(autoGenerate = true) val id: Int = 0, val title: String, val body: String, val date: Date )
15. 3PPN @Dao interface EntryDao { @Insert fun insertEntry(entry: Entry) @Update fun updateEntry(entry: Entry) @Delete fun deleteEntry(entry: Entry) @Query("SELECT * FROM entry ORDER BY date DESC") fun entriesByDate(): Flowable<List<Entry>> // RxJava 2 }
16. 3PPN @Dao interface EntryDao { @Insert fun insertEntry(entry: Entry) @Update fun updateEntry(entry: Entry) @Delete fun deleteEntry(entry: Entry) @Query("SELECT * FROM entry ORDER BY date DESC") fun entriesByDate(): LiveData<List<Entry>> // LiveData }
17. 3PPN @Dao interface EntryDao { @Insert fun insertEntry(entry: Entry) @Update fun updateEntry(entry: Entry) @Delete fun deleteEntry(entry: Entry) @Query("SELECT * FROM entry ORDER BY date DESC") fun entriesByDate(): LivePagedListProvider<Int, Entry> // Paging Library }
18. 3PPN class EntriesViewModel @Inject constructor(entryDao: EntryDao): ViewModel() { val entries: LiveData<PagedList<Entry>> = entryDao.entriesByDate().create(0, 50) } class EntriesAdapter: PagedListAdapter<Entry, EntryViewHolder>(EntryDiffCallback()) { override fun onBindViewHolder(holder: EntryViewHolder?, position: Int) { val entry = getItem(position) holder?.bindTo(entry) } ... } val entriesAdapter = EntriesAdapter() viewModel.entries.observe(this, Observer { list -> entriesAdapter.setList(list) }) recyclerView.adapter = entriesAdapter
19. 3FBDUJWF
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20. 3Y+BWB fun createEntry(title: String, body: String) = Completable.create { emitter -> val entry = Entry(title = title, body = body, date = Date()) // Slow entryDao.insertEntry(entry) emitter.onComplete() }
21. ΦϒδΣΫτͷੜ੒ɾ؅ཧ
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26. %BHHFS
     class App: Application(), HasActivityInjector { @Inject lateinit var activityInjector: DispatchingAndroidInjector<Activity> private fun applicationInjector() = DaggerAppComponent.builder() .app(this) .build() override fun onCreate() { super.onCreate() applicationInjector().inject(this) } override fun activityInjector() = activityInjector }
27. %BHHFS
     @Singleton @Component(modules = arrayOf( AndroidSupportInjectionModule::class, AppModule::class, DatabaseModule::class, ActivityBuilder::class )) interface AppComponent { @Component.Builder interface Builder { @BindsInstance fun app(app: App): Builder fun build(): AppComponent } fun inject(app: App) }
28. %BHHFS
     @Module abstract class AppModule { @Binds abstract fun bindsContext(app: App): Context } @Module abstract class ActivityBuilder { @ContributesAndroidInjector abstract fun contributesMainActivity(): MainActivity } @Module object DatabaseModule { @JvmStatic @Singleton @Provides fun providesAppDatabase(context: Context): Database = Room.databaseBuilder(context, Database::class.java, "diary_db").build() @JvmStatic @Provides fun providesEntryDao(database: Database) = database.entryDao() }
29. %BHHFS
     class MainActivity : AppCompatActivity() { @Inject lateinit var entryDao: EntryDao ... override fun onCreate(savedInstanceState: Bundle?) { AndroidInjection.inject(this) super.onCreate(savedInstanceState) ... } ... }
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31. ඇಉظॲཧͷந৅Խ
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    w ॲཧதͳͷ͔Ͳ͏͔
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33. ݴޠػೳͷར༻ w ίʔϧόοΫ
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36. 3Y+BWB
     val compositeDisposable = CompositeDisposable() fun createEntry(title: String, body: String) = Completable.create { emitter -> val entry = Entry(title = title, body = body, date = Date()) entryDao.insertEntry(entry) emitter.onComplete() } fun create() { val disposable = createEntry( "ࠓ೔ͷ೔ه", "ࠓ೔ͷ൩͝൧͸ϋϯόʔάͩͬͨɻ͓͍͔ͬͨ͠ɻ") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribe() compositeDisposable.add(disposable) }
37. ·ͱΊ
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39. ͭͷߏ଄ w 0CTFSWFSύλʔϯ
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40. "OESPJE
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43. ΦϒδΣΫτͷੜ੒ɾ؅ཧ w %BHHFS
    
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44. ඇಉظॲཧͷந৅Խ w Ϋϩʔδϟ
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45. (6*ΞϓϦέʔγϣϯͷߏ଄ͱઃܭ w యܕతͳ(6*ΞϓϦέʔγϣϯͷઃܭ͸ͭͷߏ଄Ͱ
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