ДЗ

app/build.gradle

@@ -41,4 +41,5 @@ dependencies {
     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.lifecycle:lifecycle-viewmodel-android:2.9.2'
 }

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

@@ -0,0 +1,8 @@
+package otus.homework.coroutines
+
+import android.media.Image
+
+data class Cat(
+    val fact: String,
+    val imageUrl: String
+)

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

@@ -0,0 +1,14 @@
+package otus.homework.coroutines
+
+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: Int,
+    @field:SerializedName("height")
+    val height: Int
+)

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

@@ -1,35 +1,58 @@
-package otus.homework.coroutines
-
-import retrofit2.Call
-import retrofit2.Callback
-import retrofit2.Response
-
-class CatsPresenter(
-    private val catsService: CatsService
-) {
-
-    private var _catsView: ICatsView? = null
-
-    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()!!)
-                }
-            }
-
-            override fun onFailure(call: Call<Fact>, t: Throwable) {
-                CrashMonitor.trackWarning()
-            }
-        })
-    }
-
-    fun attachView(catsView: ICatsView) {
-        _catsView = catsView
-    }
-
-    fun detachView() {
-        _catsView = null
-    }
-}
+//package otus.homework.coroutines
+//
+//import kotlinx.coroutines.CoroutineName
+//import kotlinx.coroutines.CoroutineScope
+//import kotlinx.coroutines.Dispatchers
+//import kotlinx.coroutines.Job
+//import kotlinx.coroutines.async
+//import kotlinx.coroutines.launch
+//import java.net.SocketTimeoutException
+//import kotlin.coroutines.cancellation.CancellationException
+//
+//
+//class CatsPresenter(
+//    private val catsService: CatsService,
+//    private val catsImagesService: CatsImageService,
+//    private val presenterScope: CoroutineScope = CoroutineScope(Dispatchers.Main + CoroutineName("CatsCoroutine"))
+//) {
+//
+//    private var _catsView: ICatsView? = null
+//    private var job: Job? = null
+//
+//    fun onInitComplete() {
+//    job = presenterScope.launch {
+//        try {
+//              val fact = async { catsService.getCatFact() }.await()
+//              val catImage:CatImage = async { catsImagesService.getCatImage()[0] }.await()
+//              _catsView?.populate(Cat(fact.toString(), catImage.url))
+//
+//        } catch (ex: Exception) {
+//
+//            if (ex is CancellationException) throw ex
+//            when (ex) {
+//
+//                is SocketTimeoutException -> {
+//                    _catsView?.onError("Unable to get response from server")
+//                }
+//                else -> {
+//                  CrashMonitor.trackWarning(ex.message.toString())
+//                    _catsView?.onError(ex.message.toString())
+//                }
+//            }
+//        }
+//    }
+//    }
+//
+//    fun onStop() {
+//        job?.cancel()
+//    }
+//
+//
+//     fun attachView(catsView: ICatsView) {
+//        _catsView = catsView
+//    }
+//
+//    fun detachView() {
+//        _catsView = null
+//    }
+//}

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

@@ -1,10 +1,17 @@
 package otus.homework.coroutines
 
-import retrofit2.Call
+
 import retrofit2.http.GET
 
 interface CatsService {
 
     @GET("fact")
-    fun getCatFact() : Call<Fact>
-}
+    suspend fun getCatFact() : Fact
+}
+
+interface CatsImageService {
+
+    @GET("v1/images/search")
+    suspend fun getCatImage() : List<CatImage>
+
+}

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

@@ -2,31 +2,49 @@ package otus.homework.coroutines
 
 import android.content.Context
 import android.util.AttributeSet
+import android.util.Log
 import android.widget.Button
+import android.widget.ImageView
 import android.widget.TextView
+import android.widget.Toast
+import com.squareup.picasso.Picasso
 import androidx.constraintlayout.widget.ConstraintLayout
 
+
 class CatsView @JvmOverloads constructor(
     context: Context,
     attrs: AttributeSet? = null,
     defStyleAttr: Int = 0
 ) : ConstraintLayout(context, attrs, defStyleAttr), ICatsView {
 
-    var presenter :CatsPresenter? = null
+//    var presenter: CatsPresenter? = null
+
+    override fun populate(cat: Cat) {
+        findViewById<TextView>(R.id.fact_textView).text = cat.fact
+        Picasso.get().load(cat.imageUrl).into(findViewById<ImageView>(R.id.catImageView));
+    }
+
+    override fun onError(text: String) {
+        Toast.makeText(context, text, Toast.LENGTH_SHORT).show()
+    }
 
-    override fun onFinishInflate() {
-        super.onFinishInflate()
+    fun showErrorToast(errorMsg: String) {
+        Toast.makeText(context, errorMsg, Toast.LENGTH_SHORT).show()
+    }
+
+    fun setOnButtonClick(onButtonClick: () -> Unit) {
         findViewById<Button>(R.id.button).setOnClickListener {
-            presenter?.onInitComplete()
+            Log.d("TAG", "Button clicked")
+            onButtonClick()
         }
     }
 
-    override fun populate(fact: Fact) {
-        findViewById<TextView>(R.id.fact_textView).text = fact.fact
-    }
 }
 
-interface ICatsView {
+    public interface ICatsView {
+
+        fun populate(cat: Cat)
+
+        fun onError(errorMsg: String)
+    }
 
-    fun populate(fact: Fact)
-}

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

@@ -0,0 +1,50 @@
+package otus.homework.coroutines
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import androidx.lifecycle.viewmodel.initializer
+import androidx.lifecycle.viewmodel.viewModelFactory
+import kotlinx.coroutines.async
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.CoroutineExceptionHandler
+
+class CatsViewModel(
+    private val catsService: CatsService,
+    private val catsImageService: CatsImageService
+) : ViewModel() {
+
+
+    private val _uiState = MutableLiveData<Result>()
+
+    private val exceptionHandler = CoroutineExceptionHandler { _, e ->
+        CrashMonitor.trackWarning("${e.message}")
+        _uiState.value = Result.Error( e )
+    }
+
+    val uiState: LiveData<Result>
+        get() = _uiState
+
+    fun populate () {
+        viewModelScope.launch(exceptionHandler) {
+            val fact = async { catsService.getCatFact() }
+            val image = async { catsImageService.getCatImage()[0] }
+            val cat = Cat(fact.await().fact, image.await().url)
+
+            _uiState.value = Result.Success(cat)
+        }
+    }
+
+    companion object {
+        fun provideFactory(
+            catsService: CatsService,
+            catsImageService: CatsImageService
+        ): ViewModelProvider.Factory = viewModelFactory {
+            initializer {
+                CatsViewModel(catsService, catsImageService)
+            }
+        }
+    }
+}

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(warningMessage: String) {
+        Log.d("TAG", "Crash logged: $warningMessage")
     }
 }

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

@@ -2,15 +2,27 @@ package otus.homework.coroutines
 
 import retrofit2.Retrofit
 import retrofit2.converter.gson.GsonConverterFactory
+import kotlin.getValue
 
 class DiContainer {
 
-    private val retrofit by lazy {
+    private val catsFactRetrofit by lazy {
         Retrofit.Builder()
             .baseUrl("https://catfact.ninja/")
             .addConverterFactory(GsonConverterFactory.create())
             .build()
     }
 
-    val service by lazy { retrofit.create(CatsService::class.java) }
-}
+    val catsService by lazy { catsFactRetrofit.create(CatsService::class.java) }
+
+    private val catsImageRetrofit by lazy {
+        Retrofit.Builder()
+            .baseUrl("https://api.thecatapi.com/")
+            .addConverterFactory(GsonConverterFactory.create())
+            .build()
+    }
+
+    val catsImageService by lazy { catsImageRetrofit.create(CatsImageService::class.java) }
+
+
+}

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

@@ -2,29 +2,64 @@ package otus.homework.coroutines
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.lifecycle.Observer
+import androidx.lifecycle.ViewModelProvider
+import otus.homework.coroutines.Result
+import kotlin.getValue
 
 class MainActivity : AppCompatActivity() {
 
-    lateinit var catsPresenter: CatsPresenter
+//    lateinit var catsPresenter: CatsPresenter
 
     private val diContainer = DiContainer()
 
+    private val viewModel by lazy {
+        ViewModelProvider(
+            this,
+            CatsViewModel.provideFactory(diContainer.catsService, diContainer.catsImageService)
+        )[CatsViewModel::class.java]
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         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()
-    }
+        viewModel.populate()
+
+        view.setOnButtonClick {
+            viewModel.populate()
+
+
+//        catsPresenter = CatsPresenter(diContainer.catsService, diContainer.catsImageService)
+//        view.presenter = catsPresenter
+//        catsPresenter.attachView(view)
+//        catsPresenter.onInitComplete()
 
-    override fun onStop() {
-        if (isFinishing) {
-            catsPresenter.detachView()
         }
-        super.onStop()
+
+
+        val catObserver = Observer <Result> { catResult ->
+            when(catResult) {
+                is Result.Error -> view.showErrorToast(catResult.throwable.message.toString())
+                is Result.Success<*> -> view.populate(catResult.catData as Cat)
+
+
+            }
+
+        }
+        viewModel.uiState.observe(this, catObserver)
+
+//    fun onStart() {
+//        super.onStart()
+//       viewModel.populate()
+//    }
+//
+//    override fun onStop() {
+//        super.onStop()
+//    }
     }
-}
+}
+
+

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

@@ -0,0 +1,7 @@
+package otus.homework.coroutines
+
+
+sealed class Result {
+    data class Success<out T>(val catData: T) : Result()
+    data class Error(val throwable: Throwable) : Result()
+}