create module and implement it

photolist/.gitignore

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+/build

photolist/build.gradle

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+apply plugin: 'com.android.library'
+apply from: '../core.gradle'
+
+dependencies {
+    implementation project(':base')
+}

photolist/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

photolist/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.hako.photolist" />

photolist/src/main/java/com/hako/photolist/di/PhotolistModules.kt

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+package com.hako.photolist.di
+
+import com.hako.base.domain.network.RemoteClient
+import com.hako.photolist.domain.datasource.PhotolistRemoteApi
+import com.hako.photolist.domain.usecase.GetPhoto
+import com.hako.photolist.viewmodel.PhotolistViewmodel
+import org.koin.androidx.viewmodel.dsl.viewModel
+import org.koin.dsl.module
+
+val photoListModules = module {
+    factory { get<RemoteClient>().getClient(PhotolistRemoteApi::class.java) }
+    factory { GetPhoto(get()) }
+
+    viewModel { PhotolistViewmodel() }
+}

photolist/src/main/java/com/hako/photolist/domain/datasource/PhotolistRemoteApi.kt

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+package com.hako.photolist.domain.datasource
+
+import com.hako.photolist.model.Photo
+import io.reactivex.Single
+import retrofit2.http.GET
+import retrofit2.http.Query
+
+interface PhotolistRemoteApi {
+
+    @GET("/photos")
+    fun getPhotos(
+        @Query("albumId") albumId: Int
+    ): Single<List<Photo>>
+}

photolist/src/main/java/com/hako/photolist/domain/usecase/GetPhoto.kt

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+package com.hako.photolist.domain.usecase
+
+import com.hako.base.domain.database.dao.PhotoDao
+import com.hako.photolist.domain.datasource.PhotolistRemoteApi
+import com.hako.photolist.model.*
+import io.reactivex.Single
+import io.reactivex.schedulers.Schedulers
+import org.koin.core.KoinComponent
+import org.koin.core.get
+
+class GetPhoto(private val dao: PhotoDao) : KoinComponent {
+
+    private val api: PhotolistRemoteApi = get()
+
+    fun execute(
+        albumId: Int,
+        onSuccess: (List<PhotoViewable>) -> Unit,
+        onError: (Throwable) -> Unit,
+        onLoading: () -> Unit
+    ) {
+        Single.fromCallable { dao.getPhotos(albumId) }
+            .subscribeOn(Schedulers.io())
+            .doOnError { onError(it) }
+            .doOnSuccess { dbAlbum ->
+                if (dbAlbum.isEmpty() || dbAlbum.count() == 0) {
+                    api.getPhotos(albumId)
+                        .doOnSuccess {
+                            dao.saveAll(it.map { album -> album.toPhotoEntity() })
+                            onSuccess(dao.getPhotos(albumId).map { album -> album.toPhotoViewable() })
+                        }
+                        .doOnSubscribe { onLoading() }
+                        .subscribeOn(Schedulers.io())
+                        .subscribe({}, { onError(it) })
+                } else {
+                    onSuccess(dbAlbum.map { it.toPhotoViewable() })
+                }
+            }
+            .subscribe()
+    }
+}

photolist/src/main/java/com/hako/photolist/feature/PhotolistFragment.kt

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+package com.hako.photolist.feature
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.fragment.app.Fragment
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.hako.base.domain.network.RequestStatus
+import com.hako.base.extensions.gone
+import com.hako.base.extensions.observeNonNull
+import com.hako.base.extensions.visible
+import com.hako.photolist.R
+import com.hako.photolist.model.PhotoViewable
+import com.hako.photolist.viewmodel.PhotolistViewmodel
+import com.hako.photolist.widget.PhotolistAdapter
+import kotlinx.android.synthetic.main.fragment_photolist.*
+import org.koin.androidx.viewmodel.ext.android.viewModel
+import timber.log.Timber
+
+class PhotolistFragment : Fragment() {
+
+    private val viewModel: PhotolistViewmodel by viewModel()
+    private val listAdapter by lazy { PhotolistAdapter() }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
+    ): View = inflater.inflate(R.layout.fragment_photolist, container, false)
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        setRecycler()
+        setObservers()
+        // TODO: Get album by bundle
+        viewModel.fetchPhotos(2)
+    }
+
+    private fun setObservers() {
+        viewModel.data.observeNonNull(this) {
+            it.either(::handleFetchError, ::handleFetchSuccess)
+        }
+
+        viewModel.requestStatus.observeNonNull(this) {
+            when (it) {
+                RequestStatus.Ready -> {
+                    fragment_photolist_error_overlay.gone()
+                    fragment_photolist_loading_overlay.gone()
+                }
+                RequestStatus.Loading -> {
+                    fragment_photolist_error_overlay.gone()
+                    fragment_photolist_loading_overlay.visible()
+                }
+                RequestStatus.Errored -> {
+                    fragment_photolist_error_overlay.visible()
+                    fragment_photolist_loading_overlay.gone()
+                }
+            }
+        }
+    }
+
+    private fun handleFetchError(throwable: Throwable) {
+        Timber.e(throwable)
+    }
+
+    private fun handleFetchSuccess(photos: List<PhotoViewable>) {
+        listAdapter.addAll(photos)
+    }
+
+    private fun setRecycler() {
+        fragment_photolist_recycler_container.apply {
+            layoutManager = LinearLayoutManager(context)
+            adapter = listAdapter
+        }
+    }
+}

photolist/src/main/java/com/hako/photolist/model/PhotoModels.kt

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+package com.hako.photolist.model
+
+import android.os.Parcelable
+import com.google.gson.annotations.SerializedName
+import com.hako.base.domain.database.entities.PhotoEntity
+import kotlinx.android.parcel.Parcelize
+
+@Parcelize
+data class Photo(
+    @SerializedName("id") val id: Int,
+    @SerializedName("albumId") val albumId: Int,
+    @SerializedName("title") val title: String,
+    @SerializedName("url") val photoUrl: String,
+    @SerializedName("thumbnailUrl") val thumbnailUrl: String
+) : Parcelable
+
+data class PhotoViewable(
+    val id: Int,
+    val albumId: Int,
+    val title: String,
+    val photoUrl: String
+)
+
+fun Photo.toPhotoEntity() = PhotoEntity(this.id, this.albumId, this.title, this.photoUrl, this.thumbnailUrl)
+
+fun PhotoEntity.toPhotoViewable() = PhotoViewable(this.id, this.albumId, this.title, this.photoUrl)
+

photolist/src/main/java/com/hako/photolist/viewmodel/PhotolistViewmodel.kt

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+package com.hako.photolist.viewmodel
+
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import com.hako.base.domain.network.RequestStatus
+import com.hako.base.domain.network.RequestStatus.Ready
+import com.hako.base.domain.network.RequestStatus.Loading
+import com.hako.base.domain.network.RequestStatus.Errored
+import com.hako.base.domain.Either
+import com.hako.photolist.domain.usecase.GetPhoto
+import com.hako.photolist.model.PhotoViewable
+import org.koin.core.KoinComponent
+import org.koin.core.get
+
+class PhotolistViewmodel : ViewModel(), KoinComponent {
+
+    val data = MutableLiveData<Either<Throwable, List<PhotoViewable>>>()
+    val requestStatus = MutableLiveData<RequestStatus>()
+
+    private val getPhoto: GetPhoto = get()
+
+    fun fetchPhotos(albumId: Int) {
+        getPhoto.execute(
+            albumId,
+            onSuccess = {
+                requestStatus.postValue(Ready)
+                data.postValue(Either.Right(it))
+            },
+            onLoading = {
+                requestStatus.postValue(Loading)
+            },
+            onError = {
+                requestStatus.postValue(Errored)
+                data.postValue(Either.Left(it))
+            })
+    }
+}

photolist/src/main/java/com/hako/photolist/widget/PhotolistAdapter.kt

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+package com.hako.photolist.widget
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import com.hako.base.extensions.autoNotify
+import com.hako.photolist.R
+import com.hako.photolist.model.PhotoViewable
+import kotlinx.android.synthetic.main.item_photo_card.view.*
+import kotlin.properties.Delegates
+
+class PhotolistAdapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
+
+    private var items by Delegates.observable(emptyList<PhotoViewable>()) { _, oldList, newList ->
+        autoNotify(oldList, newList) { old, new -> old.id == new.id }
+        notifyDataSetChanged()
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder =
+        PhotoViewHolder(
+            LayoutInflater
+                .from(parent.context)
+                .inflate(R.layout.item_photo_card, parent, false)
+        )
+
+    fun getItem(position: Int) = items[position]
+
+    fun addAll(list: List<PhotoViewable>) {
+        items = list
+    }
+
+    override fun getItemCount() = items.size
+
+    override fun onBindViewHolder(viewholder: RecyclerView.ViewHolder, position: Int) =
+        when (viewholder) {
+            is PhotoViewHolder -> viewholder.bind(items[position])
+            else -> throw NoWhenBranchMatchedException("Undefined viewholder")
+        }
+}
+
+class PhotoViewHolder(private val view: View) :
+    RecyclerView.ViewHolder(view) {
+
+    fun bind(photo: PhotoViewable) = with(view) {
+        item_photo_card_title.text = photo.title
+
+        // TODO load image
+    }
+}

photolist/src/main/res/layout/fragment_photolist.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:id="@+id/fragment_photolist_base">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/fragment_photolist_recycler_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.hako.base.widgets.LoadingOverlay
+        android:id="@+id/fragment_photolist_loading_overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+    <com.hako.base.widgets.NetworkErrorOverlay
+        android:id="@+id/fragment_photolist_error_overlay"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:visibility="gone"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

photolist/src/main/res/layout/item_photo_card.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/item_photo_card_container"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:layout_marginStart="8dp"
+    android:layout_marginTop="8dp"
+    android:layout_marginEnd="8dp"
+    android:background="@drawable/bg_card"
+    android:elevation="2dp"
+    android:orientation="vertical">
+
+    <ImageView
+        android:id="@+id/item_photo_card_photo"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:adjustViewBounds="true"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:srcCompat="@drawable/img_photo_placeholder"
+        android:contentDescription="Album photo" />
+
+    <androidx.constraintlayout.widget.ConstraintLayout
+        android:id="@+id/item_photo_card_footer_container"
+        android:layout_width="match_parent"
+        android:layout_height="70dp"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/item_photo_card_photo">
+
+        <TextView
+            android:id="@+id/item_photo_card_title"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="24dp"
+            android:layout_marginTop="16dp"
+            android:layout_marginEnd="24dp"
+            android:ellipsize="end"
+            android:textSize="18sp"
+            android:textStyle="bold"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toTopOf="parent"
+            tools:text="Album name" />
+    </androidx.constraintlayout.widget.ConstraintLayout>
+
+</androidx.constraintlayout.widget.ConstraintLayout>

photolist/src/main/res/navigation/photolist_navigation.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<navigation xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/photolist_navigation"
+    app:startDestination="@id/photolistFragment">
+
+    <fragment
+        android:id="@+id/photolistFragment"
+        android:name="com.hako.photolist.feature.PhotolistFragment"
+        tools:layout="@layout/fragment_photolist"
+        android:label="PhotolistFragment" />
+
+</navigation>

photolist/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">photolist</string>
+</resources>