Coroutines-Homework

app/build.gradle

@@ -4,13 +4,13 @@ plugins {
 }
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 33
     buildToolsVersion "30.0.3"
 
     defaultConfig {
         applicationId "otus.homework.coroutines"
         minSdkVersion 23
-        targetSdkVersion 30
+        targetSdkVersion 33
         versionCode 1
         versionName "1.0"
 
@@ -30,11 +30,17 @@ android {
     kotlinOptions {
         jvmTarget = '1.8'
     }
+    buildFeatures {
+        viewBinding true
+    }
 }
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
     implementation 'androidx.core:core-ktx:1.3.2'
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.7.2"
+    implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.4.0"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0"
     implementation 'com.squareup.retrofit2:retrofit:2.9.0'
     implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
     implementation 'com.google.code.gson:gson:2.8.6'

app/src/main/AndroidManifest.xml

@@ -10,7 +10,8 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.Coroutines">
-        <activity android:name=".MainActivity"
+        <activity
+            android:name=".presentation.mvvm.MainActivityMVVM"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

app/src/main/java/otus/homework/coroutines/data/CatsService.kt

@@ -0,0 +1,9 @@
+package otus.homework.coroutines.data
+
+import retrofit2.http.GET
+
+interface CatsService {
+
+    @GET("fact")
+    suspend fun getCatFact(): FactDto
+}

app/src/main/java/otus/homework/coroutines/data/FactDto.kt

@@ -0,0 +1,10 @@
+package otus.homework.coroutines.data
+
+import com.google.gson.annotations.SerializedName
+
+data class FactDto(
+    @SerializedName("fact")
+    val fact: String,
+    @SerializedName("length")
+    val length: String
+)

app/src/main/java/otus/homework/coroutines/data/ImageDto.kt

@@ -0,0 +1,14 @@
+package otus.homework.coroutines.data
+
+import com.google.gson.annotations.SerializedName
+
+data class ImageDto(
+    @SerializedName("id")
+    val id: String,
+    @SerializedName("url")
+    val url: String,
+    @SerializedName("width")
+    val width: Int,
+    @SerializedName("height")
+    val height: Int
+)

app/src/main/java/otus/homework/coroutines/data/ImageService.kt

@@ -0,0 +1,9 @@
+package otus.homework.coroutines.data
+
+import retrofit2.http.GET
+
+interface ImageService {
+
+    @GET("images/search")
+    suspend fun getImage(): ArrayList<ImageDto>
+}

app/src/main/java/otus/homework/coroutines/data/RepositoryImpl.kt

@@ -0,0 +1,13 @@
+package otus.homework.coroutines.data
+
+import otus.homework.coroutines.domain.Repository
+
+class RepositoryImpl(
+    private val catsService: CatsService,
+    private val imageService: ImageService
+) : Repository {
+
+    override suspend fun getFact(): String = catsService.getCatFact().fact
+
+    override suspend fun getImageUrl(): String = imageService.getImage()[0].url
+}

app/src/main/java/otus/homework/coroutines/di/DiContainer.kt

@@ -0,0 +1,36 @@
+package otus.homework.coroutines.di
+
+import otus.homework.coroutines.data.CatsService
+import otus.homework.coroutines.data.ImageService
+import otus.homework.coroutines.data.RepositoryImpl
+import otus.homework.coroutines.domain.GetCatModelUseCase
+import otus.homework.coroutines.presentation.mvvm.MainViewModel
+import retrofit2.Retrofit
+import retrofit2.converter.gson.GsonConverterFactory
+
+class DiContainer {
+
+    private val factRetrofit by lazy {
+        Retrofit.Builder()
+            .baseUrl("https://catfact.ninja/")
+            .addConverterFactory(GsonConverterFactory.create())
+            .build()
+    }
+
+    private val factService by lazy { factRetrofit.create(CatsService::class.java) }
+
+    private val imageRetrofit by lazy {
+        Retrofit.Builder()
+            .baseUrl("https://api.thecatapi.com/v1/")
+            .addConverterFactory(GsonConverterFactory.create())
+            .build()
+    }
+
+    private val imageService by lazy { imageRetrofit.create(ImageService::class.java) }
+
+    private val repository by lazy { RepositoryImpl(factService, imageService) }
+
+    val useCase by lazy { GetCatModelUseCase(repository) }
+
+    val mainViewModel by lazy { MainViewModel(useCase) }
+}

app/src/main/java/otus/homework/coroutines/domain/CatModel.kt

@@ -0,0 +1,6 @@
+package otus.homework.coroutines.domain
+
+data class CatModel(
+    val fact: String,
+    val imageUrl: String
+)

app/src/main/java/otus/homework/coroutines/domain/GetCatModelUseCase.kt

@@ -0,0 +1,14 @@
+package otus.homework.coroutines.domain
+
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.withContext
+
+class GetCatModelUseCase(private val repository: Repository) {
+
+    suspend operator fun invoke(): CatModel = withContext(Dispatchers.IO) {
+        val fact = async { repository.getFact() }
+        val url = async { repository.getImageUrl() }
+        CatModel(fact.await(), url.await())
+    }
+}

app/src/main/java/otus/homework/coroutines/domain/Repository.kt

@@ -0,0 +1,8 @@
+package otus.homework.coroutines.domain
+
+interface Repository {
+
+    suspend fun getFact(): String
+
+    suspend fun getImageUrl(): String
+}

app/src/main/java/otus/homework/coroutines/CrashMonitor.kt → app/src/main/java/otus/homework/coroutines/presentation/CrashMonitor.kt

@@ -1,4 +1,4 @@
-package otus.homework.coroutines
+package otus.homework.coroutines.presentation
 
 object CrashMonitor {
 
@@ -7,4 +7,4 @@ object CrashMonitor {
      */
     fun trackWarning() {
     }
-}
+}

app/src/main/java/otus/homework/coroutines/presentation/mvp/CatsPresenter.kt

@@ -0,0 +1,41 @@
+package otus.homework.coroutines.presentation.mvp
+
+import kotlinx.coroutines.*
+import otus.homework.coroutines.domain.GetCatModelUseCase
+import otus.homework.coroutines.presentation.CrashMonitor
+import java.net.SocketTimeoutException
+
+class CatsPresenter(
+    private val catUseCase: GetCatModelUseCase
+) {
+    private var _catsView: ICatsView? = null
+    private var scope: CoroutineScope? = null
+
+    init {
+        scope = CoroutineScope(Dispatchers.Main + CoroutineName("CatsCoroutine"))
+    }
+
+    fun onInitComplete() {
+        scope?.launch {
+            try {
+                val cat = catUseCase.invoke()
+                _catsView?.populate(cat)
+            } catch (e: CancellationException) {
+                throw e
+            } catch (_: SocketTimeoutException) {
+                _catsView?.showError()
+            } catch (t: Throwable) {
+                CrashMonitor.trackWarning()
+            }
+        }
+    }
+
+    fun attachView(catsView: ICatsView) {
+        _catsView = catsView
+    }
+
+    fun detachView() {
+        _catsView = null
+        scope?.cancel()
+    }
+}

app/src/main/java/otus/homework/coroutines/presentation/mvp/CatsView.kt

@@ -0,0 +1,44 @@
+package otus.homework.coroutines.presentation.mvp
+
+import android.content.Context
+import android.util.AttributeSet
+import android.widget.Button
+import android.widget.ImageView
+import android.widget.TextView
+import android.widget.Toast
+import androidx.constraintlayout.widget.ConstraintLayout
+import com.squareup.picasso.Picasso
+import otus.homework.coroutines.R
+import otus.homework.coroutines.domain.CatModel
+
+class CatsView @JvmOverloads constructor(
+    context: Context,
+    attrs: AttributeSet? = null,
+    defStyleAttr: Int = 0
+) : ConstraintLayout(context, attrs, defStyleAttr), ICatsView {
+
+    var presenter: CatsPresenter? = null
+
+    override fun onFinishInflate() {
+        super.onFinishInflate()
+        findViewById<Button>(R.id.button).setOnClickListener {
+            presenter?.onInitComplete()
+        }
+    }
+
+    override fun populate(cat: CatModel) {
+        findViewById<TextView>(R.id.fact_textView).text = cat.fact
+        Picasso.get().load(cat.imageUrl).into(findViewById<ImageView>(R.id.imageView))
+    }
+
+    override fun showError() {
+        Toast.makeText(this.context, R.string.error, Toast.LENGTH_SHORT).show()
+    }
+}
+
+interface ICatsView {
+
+    fun populate(cat: CatModel)
+
+    fun showError()
+}