EC / MVP books list displayer

app/build.gradle

@@ -31,6 +31,10 @@ android {
     kotlinOptions {
         jvmTarget = '1.8'
     }
+
+    viewBinding {
+        enabled = true
+    }
 }
 
 dependencies {
@@ -40,13 +44,16 @@ dependencies {
     implementation libs.material
     implementation libs.androidx.activity
     implementation libs.androidx.constraintlayout
+    implementation libs.androidx.recyclerview
+    implementation libs.swipe.refresh.layout
     // dagger
     implementation libs.dagger
     kapt libs.dagger.compiler
 
     //retrofit
     implementation libs.retrofit
     implementation libs.retrofit.rx.adapter
+    implementation libs.converter.gson
 
     //glide
     implementation libs.glide
@@ -57,6 +64,8 @@ dependencies {
     implementation libs.rx.kotlin
 
     testImplementation libs.junit
+    testImplementation libs.mockito.core
+    testImplementation libs.mockito.kotlin
     androidTestImplementation libs.androidx.junit
     androidTestImplementation libs.androidx.espresso.core
-}
+}

app/src/main/AndroidManifest.xml

@@ -1,26 +1,29 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-	xmlns:tools="http://schemas.android.com/tools">
+    xmlns:tools="http://schemas.android.com/tools">
 
-	<application
-		android:allowBackup="true"
-		android:dataExtractionRules="@xml/data_extraction_rules"
-		android:fullBackupContent="@xml/backup_rules"
-		android:icon="@mipmap/ic_launcher"
-		android:label="@string/app_name"
-		android:roundIcon="@mipmap/ic_launcher_round"
-		android:supportsRtl="true"
-		android:theme="@style/Theme.AndroidOTChallenge"
-		tools:targetApi="31">
-		<activity
-			android:name=".MainActivity"
-			android:exported="true">
-			<intent-filter>
-				<action android:name="android.intent.action.MAIN" />
+    <uses-permission android:name="android.permission.INTERNET" />
 
-				<category android:name="android.intent.category.LAUNCHER" />
-			</intent-filter>
-		</activity>
-	</application>
+    <application
+        android:name=".MyApplication"
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.AndroidOTChallenge"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
 
-</manifest>
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/example/otchallenge/Constants.kt

@@ -0,0 +1,3 @@
+package com.example.otchallenge
+
+const val BOOKS_API_KEY="KoRB4K5LRHygfjCL2AH6iQ7NeUqDAGAB"

app/src/main/java/com/example/otchallenge/MainActivity.kt

@@ -1,22 +1,79 @@
 package com.example.otchallenge
 
 import android.os.Bundle
-import androidx.activity.enableEdgeToEdge
+import android.view.LayoutInflater
+import android.widget.Toast
 import androidx.appcompat.app.AppCompatActivity
-import androidx.core.view.ViewCompat
-import androidx.core.view.WindowInsetsCompat
-
-class MainActivity : AppCompatActivity() {
-
-	override fun onCreate(savedInstanceState: Bundle?) {
-		(application as MyApplication).appComponent.inject(this)
-		super.onCreate(savedInstanceState)
-		enableEdgeToEdge()
-		setContentView(R.layout.activity_main)
-		ViewCompat.setOnApplyWindowInsetsListener(findViewById(R.id.main)) { v, insets ->
-			val systemBars = insets.getInsets(WindowInsetsCompat.Type.systemBars())
-			v.setPadding(systemBars.left, systemBars.top, systemBars.right, systemBars.bottom)
-			insets
-		}
-	}
+import androidx.core.view.isVisible
+import androidx.recyclerview.widget.LinearLayoutManager
+import com.example.otchallenge.databinding.ActivityMainBinding
+import com.example.otchallenge.modules.DataProvider
+import com.example.otchallenge.model.BookModel
+import com.example.otchallenge.modules.ImageProvider
+import com.example.otchallenge.presenter.BooksPresenter
+import com.example.otchallenge.presenter.BooksPresenterInterface
+import com.example.otchallenge.ui.BooksAdapter
+import javax.inject.Inject
+
+class MainActivity : AppCompatActivity(), BooksPresenterInterface {
+
+    @Inject
+    lateinit var imageProvider: ImageProvider
+
+    @Inject
+    lateinit var dataProvider: DataProvider
+
+    private lateinit var binding: ActivityMainBinding
+
+    private lateinit var presenter: BooksPresenter
+
+    private lateinit var adapter: BooksAdapter
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        (application as MyApplication).appComponent.inject(this)
+        super.onCreate(savedInstanceState)
+        binding = ActivityMainBinding.inflate(LayoutInflater.from(this))
+        setContentView(binding.root)
+        initUi()
+    }
+
+    private fun initUi() {
+        binding.recyclerView.layoutManager = LinearLayoutManager(binding.root.context)
+        adapter = BooksAdapter(imageProvider)
+        binding.recyclerView.adapter = adapter
+        binding.retryButton.setOnClickListener {
+            // retry to get the information
+            dataProvider.getBooks()
+        }
+        binding.swipeRefreshLayout.setOnRefreshListener {
+            // refresh the information
+            dataProvider.getBooks()
+        }
+        // due the strong reference between ui and presenter, presenter should live
+        // only in the lifecycle scope with the view
+        presenter = BooksPresenter(this@MainActivity)
+        dataProvider.booksData.observe(this@MainActivity) {
+            // display the information with the presenter
+            presenter.presentUi(it)
+        }
+        // as view has been created we can request the initial data
+        dataProvider.getBooks()
+    }
+
+    override fun displayBooks(books: List<BookModel>) {
+        adapter.updateData(books)
+        binding.retryButton.isVisible = false
+    }
+
+    override fun displayLoader(showLoader: Boolean) {
+        binding.swipeRefreshLayout.isRefreshing = showLoader
+    }
+
+    override fun displayError(message: String?) {
+        binding.swipeRefreshLayout.isRefreshing = false
+        binding.retryButton.isVisible = true
+        message?.let {
+            Toast.makeText(this@MainActivity, it, Toast.LENGTH_LONG).show()
+        }
+    }
 }

app/src/main/java/com/example/otchallenge/MyApplication.kt

@@ -3,13 +3,20 @@ package com.example.otchallenge
 import android.app.Application
 import com.example.otchallenge.di.AppComponent
 import com.example.otchallenge.di.DaggerAppComponent
+import com.example.otchallenge.di.DataProviderModule
+import com.example.otchallenge.di.ImageProviderModule
+import com.example.otchallenge.di.NetworkProviderModule
 
 class MyApplication : Application() {
 
-	lateinit var appComponent: AppComponent
+    lateinit var appComponent: AppComponent
 
-	override fun onCreate() {
-		super.onCreate()
-		appComponent = DaggerAppComponent.builder().build()
-	}
+    override fun onCreate() {
+        super.onCreate()
+        appComponent = DaggerAppComponent.builder()
+            .networkProviderModule(NetworkProviderModule())
+            .imageProviderModule(ImageProviderModule(this))
+            .dataProviderModule(DataProviderModule())
+            .build()
+    }
 }

app/src/main/java/com/example/otchallenge/api/BooksApi.kt

@@ -0,0 +1,12 @@
+package com.example.otchallenge.api
+
+import com.example.otchallenge.BOOKS_API_KEY
+import com.example.otchallenge.model.BooksResponseModel
+import io.reactivex.Single
+import retrofit2.http.GET
+import retrofit2.http.Query
+
+interface BooksApi {
+    @GET("svc/books/v3/lists/current/hardcover-fiction.json?&api-key=${BOOKS_API_KEY}")
+    fun getBooks(@Query("offset") offset: Int = 0): Single<BooksResponseModel>
+}

app/src/main/java/com/example/otchallenge/di/AppComponent.kt

@@ -5,7 +5,13 @@ import dagger.Component
 import javax.inject.Singleton
 
 @Singleton
-@Component
+@Component(
+    modules = [
+        NetworkProviderModule::class,
+        DataProviderModule::class,
+        ImageProviderModule::class
+    ]
+)
 interface AppComponent {
-	fun inject(activity: MainActivity)
+    fun inject(activity: MainActivity)
 }

app/src/main/java/com/example/otchallenge/di/DataProviderModule.kt

@@ -0,0 +1,17 @@
+package com.example.otchallenge.di
+
+import com.example.otchallenge.api.BooksApi
+import com.example.otchallenge.modules.DataProvider
+import dagger.Module
+import dagger.Provides
+import javax.inject.Singleton
+
+@Module
+class DataProviderModule {
+
+    @Provides
+    @Singleton
+    fun provideDataProvider(api: BooksApi): DataProvider {
+        return DataProvider(api)
+    }
+}

app/src/main/java/com/example/otchallenge/di/ImageProviderModule.kt

@@ -0,0 +1,15 @@
+package com.example.otchallenge.di
+
+import android.content.Context
+import com.example.otchallenge.modules.ImageProvider
+import dagger.Module
+import dagger.Provides
+
+@Module
+class ImageProviderModule(private val context: Context) {
+
+    @Provides
+    fun provideImageProvider(): ImageProvider {
+        return ImageProvider(context)
+    }
+}

app/src/main/java/com/example/otchallenge/di/NetworkProviderModule.kt

@@ -0,0 +1,29 @@
+package com.example.otchallenge.di
+
+import com.example.otchallenge.api.BooksApi
+import dagger.Module
+import dagger.Provides
+import retrofit2.Retrofit
+import retrofit2.adapter.rxjava2.RxJava2CallAdapterFactory
+import retrofit2.converter.gson.GsonConverterFactory
+import javax.inject.Singleton
+
+@Module
+class NetworkProviderModule {
+
+    @Provides
+    @Singleton
+    fun provideRetrofit(): Retrofit {
+        return Retrofit.Builder()
+            .baseUrl("https://api.nytimes.com/")
+            .addConverterFactory(GsonConverterFactory.create())
+            .addCallAdapterFactory(RxJava2CallAdapterFactory.create())
+            .build()
+    }
+
+    @Provides
+    @Singleton
+    fun provideApi(retrofit: Retrofit): BooksApi {
+        return retrofit.create(BooksApi::class.java)
+    }
+}

app/src/main/java/com/example/otchallenge/model/BookModel.kt

@@ -0,0 +1,10 @@
+package com.example.otchallenge.model
+
+import com.google.gson.annotations.SerializedName
+
+data class BookModel(
+    val title: String? = null,
+    @SerializedName("book_image")
+    val image: String? = null,
+    val description: String? = null
+)

app/src/main/java/com/example/otchallenge/model/BooksData.kt

@@ -0,0 +1,9 @@
+package com.example.otchallenge.model
+
+data class BooksData(
+    val isLoading: Boolean = false,
+    val shouldLoadMore: Boolean = false,
+    val books: List<BookModel> = emptyList(),
+    val showError: Boolean = false,
+    val errorMessage: String? = null,
+)

app/src/main/java/com/example/otchallenge/model/BooksResponseModel.kt

@@ -0,0 +1,11 @@
+package com.example.otchallenge.model
+
+import com.google.gson.annotations.SerializedName
+
+data class BooksResponseModel(
+    @SerializedName("num_results")
+    val numResults: Int? = 0,
+    val results: BooksResultModel? = null,
+)
+
+data class BooksResultModel(val books: List<BookModel>)