homework_2: done

app/build.gradle

@@ -42,4 +42,13 @@ dependencies {
     implementation 'com.google.android.material:material:1.3.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
     implementation 'com.squareup.picasso:picasso:2.71828'
+
+    //coroutines
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.1'
+
+    //SwipeRefreshLayout
+    implementation "androidx.swiperefreshlayout:swiperefreshlayout:1.1.0"
+
+    //ViewModelScope
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.3.1"
 }

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

@@ -0,0 +1,8 @@
+package otus.homework.coroutines
+
+import com.google.gson.annotations.SerializedName
+
+data class CatImageResponse(
+    @field:SerializedName("file")
+    val fileName: String = ""
+)

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

@@ -1,35 +1,65 @@
 package otus.homework.coroutines
 
-import retrofit2.Call
-import retrofit2.Callback
-import retrofit2.Response
+import android.util.Log
+import kotlinx.coroutines.*
+import java.net.SocketTimeoutException
 
 class CatsPresenter(
-    private val catsService: CatsService
+    private val catsService: CatsService,
+    private val imageService: ImageService
 ) {
 
     private var _catsView: ICatsView? = null
+    private val presenterScope = CoroutineScope(Dispatchers.Main + CoroutineName("CatsCoroutine"))
 
     fun onInitComplete() {
-        catsService.getCatFact().enqueue(object : Callback<Fact> {
-
-            override fun onResponse(call: Call<Fact>, response: Response<Fact>) {
-                if (response.isSuccessful && response.body() != null) {
-                    _catsView?.populate(response.body()!!)
+        presenterScope.launch {
+            try {
+                _catsView?.onLoading(true)
+                val result = withContext(Dispatchers.IO) {
+                    catsService.getCatFact()
+                }
+                if (result.isSuccessful) {
+                    _catsView?.populate(Fact(result.body()!!.text))
+                } else throw Exception("Not successful result")
+            } catch (ex: Exception) {
+                when (ex) {
+                    is SocketTimeoutException -> _catsView?.showErrorDialog(ex.localizedMessage ?: "error")
+                    else -> CrashMonitor.trackWarning()
                 }
+            } finally {
+                _catsView?.onLoading(false)
             }
+        }
+    }
 
-            override fun onFailure(call: Call<Fact>, t: Throwable) {
-                CrashMonitor.trackWarning()
+    fun loadFactAndImage() {
+        presenterScope.launch {
+            try {
+                val factResult = async(Dispatchers.IO) { catsService.getCatFact() }
+                val imageResult = async(Dispatchers.IO) { imageService.getCatImage() }
+                _catsView?.onLoading(true)
+                if (factResult.await().isSuccessful && imageResult.await().isSuccessful) {
+                    _catsView?.populate(Fact(factResult.await().body()!!.text, imageResult.await().body()!!.fileName))
+                } else throw Exception("Not successful result")
+            } catch (ex: Exception) {
+                when (ex) {
+                    is SocketTimeoutException -> _catsView?.showErrorDialog(ex.localizedMessage ?: "error")
+                    else -> CrashMonitor.trackWarning()
+                }
+            } finally {
+                _catsView?.stopRefreshing()
+                _catsView?.onLoading(false)
             }
-        })
+        }
     }
 
     fun attachView(catsView: ICatsView) {
         _catsView = catsView
     }
 
     fun detachView() {
+        presenterScope.cancel()
         _catsView = null
     }
 }

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

@@ -1,10 +1,10 @@
 package otus.homework.coroutines
 
-import retrofit2.Call
+import retrofit2.Response
 import retrofit2.http.GET
 
 interface CatsService {
 
     @GET("random?animal_type=cat")
-    fun getCatFact() : Call<Fact>
+    suspend fun getCatFact(): Response<FactResponse>
 }

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

@@ -2,31 +2,60 @@ package otus.homework.coroutines
 
 import android.content.Context
 import android.util.AttributeSet
-import android.widget.Button
-import android.widget.TextView
-import androidx.constraintlayout.widget.ConstraintLayout
+import android.widget.*
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+import com.squareup.picasso.Picasso
 
 class CatsView @JvmOverloads constructor(
     context: Context,
     attrs: AttributeSet? = null,
     defStyleAttr: Int = 0
-) : ConstraintLayout(context, attrs, defStyleAttr), ICatsView {
+) : FrameLayout(context, attrs, defStyleAttr), ICatsView {
 
-    var presenter :CatsPresenter? = null
+    var presenter: CatsPresenter? = null
+    private var swipeRefresh: SwipeRefreshLayout? = null
+    private var factButton: Button? = null
 
     override fun onFinishInflate() {
         super.onFinishInflate()
-        findViewById<Button>(R.id.button).setOnClickListener {
+        factButton = findViewById<Button>(R.id.button)
+        factButton?.setOnClickListener {
             presenter?.onInitComplete()
         }
+        swipeRefresh = findViewById(R.id.refresh_layout)
+        swipeRefresh?.setOnRefreshListener {
+            swipeRefresh?.isRefreshing = true
+            presenter?.loadFactAndImage()
+        }
     }
 
     override fun populate(fact: Fact) {
         findViewById<TextView>(R.id.fact_textView).text = fact.text
+        if (fact.image.isNotEmpty()) {
+            Picasso.get().load(fact.image).into(
+                findViewById<ImageView>(R.id.cat_image_view)
+            )
+        }
+    }
+
+    override fun showErrorDialog(message: String) {
+        Toast.makeText(this.context, message, Toast.LENGTH_LONG).show()
+    }
+
+    override fun stopRefreshing() {
+        swipeRefresh?.isRefreshing = false
+    }
+
+    override fun onLoading(value: Boolean) {
+        factButton?.isEnabled = !value
+        swipeRefresh?.isEnabled = !value
     }
 }
 
 interface ICatsView {
 
     fun populate(fact: Fact)
+    fun showErrorDialog(message: String)
+    fun stopRefreshing()
+    fun onLoading(value: Boolean)
 }

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

@@ -11,6 +11,13 @@ class DiContainer {
             .addConverterFactory(GsonConverterFactory.create())
             .build()
     }
+    private val imageRetrofit by lazy {
+        Retrofit.Builder()
+            .baseUrl("https://aws.random.cat/")
+            .addConverterFactory(GsonConverterFactory.create())
+            .build()
+    }
 
     val service by lazy { retrofit.create(CatsService::class.java) }
+    val imageService by lazy { imageRetrofit.create(ImageService::class.java) }
 }

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

@@ -1,24 +1,6 @@
 package otus.homework.coroutines
 
-import com.google.gson.annotations.SerializedName
-
 data class Fact(
-	@field:SerializedName("createdAt")
-	val createdAt: String,
-	@field:SerializedName("deleted")
-	val deleted: Boolean,
-	@field:SerializedName("_id")
-	val id: String,
-	@field:SerializedName("text")
-	val text: String,
-	@field:SerializedName("source")
-	val source: String,
-	@field:SerializedName("used")
-	val used: Boolean,
-	@field:SerializedName("type")
-	val type: String,
-	@field:SerializedName("user")
-	val user: String,
-	@field:SerializedName("updatedAt")
-	val updatedAt: String
+    val text: String = "",
+    val image: String = ""
 )

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

@@ -0,0 +1,25 @@
+package otus.homework.coroutines
+
+import com.google.gson.annotations.SerializedName
+
+data class FactResponse(
+	@field:SerializedName("createdAt")
+	val createdAt: String,
+	@field:SerializedName("deleted")
+	val deleted: Boolean,
+	@field:SerializedName("_id")
+	val id: String,
+	@field:SerializedName("text")
+	val text: String,
+	@field:SerializedName("source")
+	val source: String,
+	@field:SerializedName("used")
+	val used: Boolean,
+	@field:SerializedName("type")
+	val type: String,
+	@field:SerializedName("user")
+	val user: String,
+	@field:SerializedName("updatedAt")
+	val updatedAt: String,
+	val image: String = ""
+)

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

@@ -0,0 +1,9 @@
+package otus.homework.coroutines
+
+import retrofit2.Response
+import retrofit2.http.GET
+
+interface ImageService {
+    @GET("meow")
+    suspend fun getCatImage(): Response<CatImageResponse>
+}

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

@@ -15,7 +15,7 @@ class MainActivity : AppCompatActivity() {
         val view = layoutInflater.inflate(R.layout.activity_main, null) as CatsView
         setContentView(view)
 
-        catsPresenter = CatsPresenter(diContainer.service)
+        catsPresenter = CatsPresenter(diContainer.service, diContainer.imageService)
         view.presenter = catsPresenter
         catsPresenter.attachView(view)
         catsPresenter.onInitComplete()

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

@@ -0,0 +1,64 @@
+package otus.homework.coroutines
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.*
+import java.net.SocketTimeoutException
+
+class MainViewModel(
+    private val catsService: CatsService,
+    private val imageService: ImageService
+) : ViewModel() {
+
+    private val _resultLiveData = MutableLiveData<Result>()
+    val resultLiveData: LiveData<Result>
+        get() = _resultLiveData
+    private val handler = CoroutineExceptionHandler { _, exception ->
+        CrashMonitor.trackWarning()
+        _resultLiveData.postValue(Result.Error(exception.localizedMessage ?: "error"))
+    }
+
+    init {
+        onInitComplete()
+    }
+
+    fun onInitComplete() {
+        viewModelScope.launch(handler) {
+            _resultLiveData.postValue(Result.Loading)
+            try {
+                val result = withContext(Dispatchers.IO) {
+                    catsService.getCatFact()
+                }
+                if (result.isSuccessful) {
+                    _resultLiveData.postValue(Result.Success(Fact(result.body()!!.text)))
+                } else throw Exception("Not successful result")
+            } catch (ex: SocketTimeoutException) {
+                _resultLiveData.postValue(Result.Error(ex.localizedMessage ?: "error"))
+            }
+        }
+    }
+
+    fun loadFactAndImage() {
+        viewModelScope.launch(handler) {
+            val factResult = async(Dispatchers.IO) { catsService.getCatFact() }
+            val imageResult = async(Dispatchers.IO) { imageService.getCatImage() }
+            _resultLiveData.postValue(Result.Loading)
+            try {
+                if (factResult.await().isSuccessful && imageResult.await().isSuccessful) {
+                    _resultLiveData.postValue(Result.Success(Fact(factResult.await().body()!!.text, imageResult.await().body()!!.fileName)))
+                } else throw Exception("Not successful result")
+            } catch (ex: SocketTimeoutException) {
+                _resultLiveData.postValue(Result.Error(ex.localizedMessage ?: "error"))
+            }
+        }
+    }
+
+    sealed class Result {
+        data class Success(val data: Fact) : Result()
+        data class Error(val message: String) : Result()
+        object Loading : Result()
+    }
+
+}