homework coroutines

app/build.gradle

@@ -38,7 +38,10 @@ dependencies {
     implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
     implementation 'com.google.code.gson:gson:2.10'
     implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.9.0'
     implementation 'com.google.android.material:material:1.11.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
     implementation 'com.squareup.picasso:picasso:2.71828'
+    implementation 'androidx.activity:activity-ktx:1.2.3'
+
 }

app/src/main/java/otus/homework/coroutines/CatInfo.kt

@@ -0,0 +1,6 @@
+package otus.homework.coroutines
+
+data class CatInfo(
+    val catFact: String,
+    val catImageUrl: String,
+)

app/src/main/java/otus/homework/coroutines/CatsScreenSatate.kt

@@ -0,0 +1,8 @@
+package otus.homework.coroutines
+
+import androidx.annotation.StringRes
+
+sealed interface CatsScreenState {
+    data class Success<T>(val data: T) : CatsScreenState
+    data class Error(@StringRes val message: Int, val th: Throwable) : CatsScreenState
+}

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

@@ -1,10 +1,15 @@
 package otus.homework.coroutines
 
-import retrofit2.Call
+import otus.homework.coroutines.dto.CatImage
+import otus.homework.coroutines.dto.Fact
 import retrofit2.http.GET
+import retrofit2.http.Url
 
 interface CatsService {
 
     @GET("fact")
-    fun getCatFact() : Call<Fact>
+    suspend fun getCatFact(): Fact
+
+    @GET
+    suspend fun getCatImage(@Url url: String = "https://api.thecatapi.com/v1/images/search"): List<CatImage>
 }

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

@@ -3,16 +3,19 @@ package otus.homework.coroutines
 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
 
 class CatsView @JvmOverloads constructor(
     context: Context,
     attrs: AttributeSet? = null,
     defStyleAttr: Int = 0
 ) : ConstraintLayout(context, attrs, defStyleAttr), ICatsView {
 
-    var presenter :CatsPresenter? = null
+    var presenter: CatsViewModel? = null
 
     override fun onFinishInflate() {
         super.onFinishInflate()
@@ -21,12 +24,23 @@ class CatsView @JvmOverloads constructor(
         }
     }
 
-    override fun populate(fact: Fact) {
-        findViewById<TextView>(R.id.fact_textView).text = fact.fact
+    override fun populate(state: CatsScreenState) {
+        when (state) {
+            is CatsScreenState.Success<*> -> {
+                (state.data as? CatInfo)?.let { catInfo ->
+                    findViewById<TextView>(R.id.fact_textView).text = catInfo.catFact
+                    Picasso.get().load(catInfo.catImageUrl).into(findViewById<ImageView>(R.id.image))
+                }
+            }
+
+            is CatsScreenState.Error -> {
+                Toast.makeText(context, state.message, Toast.LENGTH_SHORT).show()
+            }
+        }
+
     }
 }
 
 interface ICatsView {
-
-    fun populate(fact: Fact)
+    fun populate(state: CatsScreenState)
 }

app/src/main/java/otus/homework/coroutines/CatsViewModel.kt

@@ -0,0 +1,59 @@
+package otus.homework.coroutines
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.CoroutineExceptionHandler
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.async
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.coroutineScope
+import kotlinx.coroutines.launch
+import java.net.SocketTimeoutException
+
+class CatsViewModel(
+    private val catsService: CatsService
+) : ViewModel() {
+
+    private var _catsView: ICatsView? = null
+
+    private val coroutineExceptionHandler = CoroutineExceptionHandler { _, exception ->
+        CrashMonitor.trackWarning(exception.message)
+    }
+
+    fun onInitComplete() {
+        viewModelScope.launch(coroutineExceptionHandler) {
+            try {
+                coroutineScope {
+                    val catFact = async(Dispatchers.IO) { catsService.getCatFact() }
+                    val catImage = async(Dispatchers.IO) { catsService.getCatImage() }
+                    val state = CatsScreenState.Success(
+                        CatInfo(
+                            catFact = catFact.await().fact,
+                            catImageUrl = catImage.await().first().url
+                        )
+                    )
+                    _catsView?.populate(state)
+                }
+            } catch (e: SocketTimeoutException) {
+                _catsView?.populate(CatsScreenState.Error(R.string.error_message, e))
+            }
+        }
+    }
+
+    fun attachView(catsView: ICatsView) {
+        _catsView = catsView
+    }
+
+
+    fun detachView() {
+        _catsView = null
+        viewModelScope.cancel()
+    }
+}
+
+class CatsViewModelFactory(private val catsService: CatsService) :
+    ViewModelProvider.NewInstanceFactory() {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T =
+        CatsViewModel(catsService) as T
+}

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

@@ -1,10 +1,13 @@
 package otus.homework.coroutines
 
+import android.util.Log
+
 object CrashMonitor {
 
     /**
      * Pretend this is Crashlytics/AppCenter
      */
-    fun trackWarning() {
+    fun trackWarning(throwableMessage: String?) {
+        Log.d("CATS_COROUTINE", "trackWarning: $throwableMessage")
     }
 }

app/src/main/java/otus/homework/coroutines/MainActivity.kt

@@ -1,11 +1,16 @@
 package otus.homework.coroutines
 
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.activity.viewModels
+import androidx.appcompat.app.AppCompatActivity
 
 class MainActivity : AppCompatActivity() {
 
-    lateinit var catsPresenter: CatsPresenter
+    private val catsViewModel: CatsViewModel by viewModels<CatsViewModel> {
+        CatsViewModelFactory(
+            diContainer.service
+        )
+    }
 
     private val diContainer = DiContainer()
 
@@ -15,15 +20,14 @@ class MainActivity : AppCompatActivity() {
         val view = layoutInflater.inflate(R.layout.activity_main, null) as CatsView
         setContentView(view)
 
-        catsPresenter = CatsPresenter(diContainer.service)
-        view.presenter = catsPresenter
-        catsPresenter.attachView(view)
-        catsPresenter.onInitComplete()
+        view.presenter = catsViewModel
+        catsViewModel.attachView(view)
+        catsViewModel.onInitComplete()
     }
 
     override fun onStop() {
         if (isFinishing) {
-            catsPresenter.detachView()
+            catsViewModel.detachView()
         }
         super.onStop()
     }

app/src/main/java/otus/homework/coroutines/dto/CatImage.kt

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

app/src/main/java/otus/homework/coroutines/dto/Fact.kt

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

app/src/main/res/layout/activity_main.xml

@@ -3,28 +3,42 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
-    android:padding="16dp"
     android:layout_height="match_parent"
+    android:padding="16dp"
     tools:context=".MainActivity">
 
-    <TextView
-        android:id="@+id/fact_textView"
-        android:textColor="@color/black"
-        android:textSize="24sp"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+    <ScrollView
+        android:layout_width="match_parent"
+        android:layout_height="match_parent">
+
+        <LinearLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:orientation="vertical">
+
+            <ImageView
+                android:id="@+id/image"
+                android:layout_width="match_parent"
+                android:layout_height="350dp"
+                android:importantForAccessibility="no"
+                android:scaleType="centerInside"
+                tools:src="@tools:sample/backgrounds/scenic" />
+
+            <TextView
+                android:id="@+id/fact_textView"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:textColor="@color/black"
+                android:textSize="24sp" />
+
+            <Button
+                android:id="@+id/button"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:text="@string/more_facts" />
+        </LinearLayout>
+    </ScrollView>
 
-    <Button
-        android:id="@+id/button"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="@string/more_facts"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/fact_textView" />
 
 </otus.homework.coroutines.CatsView>

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

@@ -1,4 +1,5 @@
 <resources>
     <string name="app_name">Cat Facts </string>
     <string name="more_facts">More Facts</string>
+    <string name="error_message">Не удалось получить ответ от сервера</string>
 </resources>