krottv · VadimSazonenko · Apr 28, 2022
diff --git a/app/build.gradle b/app/build.gradle
@@ -29,10 +29,21 @@ android {
     kotlinOptions {
         jvmTarget = '1.8'
     }
+    viewBinding {
+        enabled true
+    }
+
 }
 
+
 dependencies {
 
+    implementation("io.coil-kt:coil:2.0.0-rc03")
+    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.1")
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.4.0"
+    implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.4.0"
+    implementation "androidx.lifecycle:lifecycle-livedata-ktx:2.4.0"
+    implementation "androidx.recyclerview:recyclerview:1.2.1"
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation 'androidx.appcompat:appcompat:1.4.1'
     implementation 'com.google.android.material:material:1.5.0'

diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.github.krottv.tmstemp">
-
+    <uses-permission android:name="android.permission.INTERNET" />
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
@@ -10,7 +10,7 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.TmsTemp">
         <activity
-            android:name=".MainActivity"
+            android:name=".view.MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />

diff --git a/app/src/main/java/com/github/krottv/tmstemp/data/PostRemoteDataSource.kt b/app/src/main/java/com/github/krottv/tmstemp/data/PostRemoteDataSource.kt
@@ -0,0 +1,7 @@
+package com.github.krottv.tmstemp.data
+
+import com.github.krottv.tmstemp.domain.PostModel
+
+interface PostsRemoteDataSource {
+    suspend fun getPosts(): List<PostModel>
+}
diff --git a/app/src/main/java/com/github/krottv/tmstemp/data/PostsRemoteDataSourceFake.kt b/app/src/main/java/com/github/krottv/tmstemp/data/PostsRemoteDataSourceFake.kt
@@ -0,0 +1,21 @@
+package com.github.krottv.tmstemp.data
+
+import com.github.krottv.tmstemp.domain.PostModel
+import kotlinx.coroutines.delay
+
+class PostsRemoteDataSourceFake : PostsRemoteDataSource {
+
+    override suspend fun getPosts(): List<PostModel> {
+        delay(2000L)
+
+        val model = PostModel(
+            "https://images.unsplash.com/photo-1568127861543-b0c0696c735f?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=470&q=80",
+            "Пункт", "Какой-то текст Какой-то текст Какой-то текст Какой-то текст")
+
+        val mutableListOf = ArrayList<PostModel>(1000)
+
+        for (i in 0..1000) {
+            mutableListOf.add(model.copy(title = "${model.title} $i")) }
+        return mutableListOf
+    }
+}
diff --git a/app/src/main/java/com/github/krottv/tmstemp/data/PostsRemoteDataSourceFakeError.kt b/app/src/main/java/com/github/krottv/tmstemp/data/PostsRemoteDataSourceFakeError.kt
@@ -0,0 +1,11 @@
+package com.github.krottv.tmstemp.data
+
+import com.github.krottv.tmstemp.domain.PostModel
+import kotlinx.coroutines.delay
+
+class PostsRemoteDataSourceFakeError : PostsRemoteDataSource {
+    override suspend fun getPosts(): List<PostModel> {
+        delay(2000L)
+        throw Exception("Error")
+    }
+}
diff --git a/app/src/main/java/com/github/krottv/tmstemp/domain/PostModel.kt b/app/src/main/java/com/github/krottv/tmstemp/domain/PostModel.kt
@@ -0,0 +1,5 @@
+package com.github.krottv.tmstemp.domain
+
+data class PostModel(val image: String,
+                     val title: String,
+                     val subtitle: String)
diff --git a/app/src/main/java/com/github/krottv/tmstemp/presentation/PostViewModel.kt b/app/src/main/java/com/github/krottv/tmstemp/presentation/PostViewModel.kt
@@ -0,0 +1,29 @@
+package com.github.krottv.tmstemp.presentation
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.github.krottv.tmstemp.domain.PostModel
+import com.github.krottv.tmstemp.data.PostsRemoteDataSource
+import com.github.krottv.tmstemp.data.PostsRemoteDataSourceFake
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.launch
+
+class PostViewModel : ViewModel() {
+    private val postsRemoteDataSourse: PostsRemoteDataSource = PostsRemoteDataSourceFake()
+
+    private val _state = MutableStateFlow<Result<List<PostModel>>?>(null)
+    val state: StateFlow<Result<List<PostModel>>?> = _state
+
+    fun loadData() {
+        viewModelScope.launch(Dispatchers.IO) {
+            val result = try {
+                Result.success(postsRemoteDataSourse.getPosts())
+            } catch (t: Throwable) {
+                Result.failure(t)
+            }
+            _state.emit(result)
+        }
+    }
+}
diff --git a/app/src/main/java/com/github/krottv/tmstemp/view/MainActivity.kt b/app/src/main/java/com/github/krottv/tmstemp/view/MainActivity.kt
@@ -0,0 +1,38 @@
+package com.github.krottv.tmstemp.view
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import com.github.krottv.tmstemp.presentation.PostViewModel
+import kotlinx.coroutines.launch
+
+class MainActivity : AppCompatActivity() {
+
+    lateinit var viewModel: PostViewModel
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        viewModel = ViewModelProvider(this)[PostViewModel::class.java]
+
+        val mainActivityBinder = MainActivityBinder(this)
+        mainActivityBinder.bindView()
+
+        viewModel.loadData()
+
+        lifecycleScope.launch {
+            viewModel.state.collect {
+                if (it != null) {
+                    if (it.isSuccess) {
+                        mainActivityBinder.PostsScene()
+                        mainActivityBinder.onDataLoaded(it.getOrThrow())
+                    }
+                    if (it.isFailure) {
+                        mainActivityBinder.ErrorScene(it.exceptionOrNull() as Throwable)
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/app/src/main/java/com/github/krottv/tmstemp/view/MainActivityBinder.kt b/app/src/main/java/com/github/krottv/tmstemp/view/MainActivityBinder.kt
@@ -0,0 +1,61 @@
+package com.github.krottv.tmstemp.view
+
+import android.app.Activity
+import android.view.LayoutInflater
+
+import android.widget.TextView
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import androidx.recyclerview.widget.RecyclerView.*
+import androidx.transition.Scene
+import androidx.transition.TransitionManager
+import com.github.krottv.tmstemp.R
+import com.github.krottv.tmstemp.databinding.ActivityMainBinding
+import com.github.krottv.tmstemp.domain.PostModel
+
+class MainActivityBinder(val activity: Activity) {
+
+    private lateinit var binding: RecyclerView
+    private lateinit var rootScene: ActivityMainBinding
+    private lateinit var loadScene: Scene
+    private lateinit var postsScene: Scene
+
+    fun bindView() {
+        rootScene = ActivityMainBinding.inflate(LayoutInflater.from(activity))
+        activity.setContentView(rootScene.root)
+        LoadScene()
+        activity.findViewById<TextView>(R.id.btDelete)
+            .setOnClickListener {
+                (binding.adapter as PostsAdapter).removeFirstItem()
+            }
+    }
+
+    private fun LoadScene() {
+        loadScene = Scene.getSceneForLayout(rootScene.sceneRoot, R.layout.progress_bar, activity)
+        TransitionManager.go(loadScene)
+    }
+
+    fun PostsScene() {
+        postsScene = Scene.getSceneForLayout(rootScene.sceneRoot, R.layout.recyclerview_scene, activity)
+        TransitionManager.go(postsScene)
+        binding = rootScene.sceneRoot.findViewById(R.id.View)
+        val layoutManger = LinearLayoutManager(activity, VERTICAL, false)
+        binding.layoutManager = layoutManger
+    }
+
+    fun ErrorScene(e: Throwable) {
+        val errorScene =
+            Scene.getSceneForLayout(rootScene.sceneRoot, R.layout.error_layout, activity)
+        TransitionManager.go(errorScene)
+        val error = rootScene.sceneRoot.findViewById<TextView>(R.id.error)
+        error.text = e.message
+    }
+
+    fun onDataLoaded(list: List<PostModel>) {
+        if (binding.adapter == null) {
+            binding.adapter = PostsAdapter(list)
+        } else {
+            (binding.adapter as PostsAdapter).data = list as MutableList<PostModel>
+        }
+    }
+}
diff --git a/app/src/main/java/com/github/krottv/tmstemp/view/PostViewHolder.kt b/app/src/main/java/com/github/krottv/tmstemp/view/PostViewHolder.kt
@@ -0,0 +1,14 @@
+package com.github.krottv.tmstemp.view
+
+import android.view.View
+import android.widget.ImageView
+import android.widget.TextView
+import androidx.recyclerview.widget.RecyclerView
+import com.github.krottv.tmstemp.R
+
+class PostViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+    val image1 = view.findViewById<ImageView>(R.id.imageView1)
+    val textView1 = view.findViewById<TextView>(R.id.textView1)
+    val textView2 = view.findViewById<TextView>(R.id.textView2)
+    val image2 = view.findViewById<ImageView>(R.id.imageView2)
+}
diff --git a/app/src/main/java/com/github/krottv/tmstemp/view/PostsAdapter.kt b/app/src/main/java/com/github/krottv/tmstemp/view/PostsAdapter.kt
@@ -0,0 +1,35 @@
+package com.github.krottv.tmstemp.view
+
+import android.view.LayoutInflater
+import android.view.ViewGroup
+import androidx.recyclerview.widget.RecyclerView
+import coil.load
+import com.github.krottv.tmstemp.R
+import com.github.krottv.tmstemp.domain.PostModel
+
+class PostsAdapter(data: List<PostModel>) : RecyclerView.Adapter<PostViewHolder>() {
+
+    var data: MutableList<PostModel> = data as MutableList<PostModel>
+
+    fun removeFirstItem() {
+        data.removeAt(0)
+        notifyItemRemoved(0)
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): PostViewHolder {
+        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_post, parent, false)
+        return PostViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: PostViewHolder, position: Int) {
+        val item = data[position]
+        holder.image1.load(item.image)
+        holder.textView1.text = item.title
+        holder.textView2.text = item.subtitle
+        holder.image2.load(item.image)
+    }
+
+    override fun getItemCount(): Int {
+        return data.size
+    }
+}
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
@@ -4,15 +4,33 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".view.MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
+
+    <FrameLayout
+        android:id="@+id/scene_root"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@+id/btDelete"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <TextView
+        android:id="@+id/btDelete"
+        android:layout_width="0dp"
+        android:layout_height="52dp"
+        android:layout_marginStart="25dp"
+        android:layout_marginEnd="23dp"
+        android:layout_marginBottom="15dp"
+        android:background="#2F80ED "
+        android:text="Удалить один"
+        android:gravity="center"
+        android:textAlignment="center"
+        android:textColor="#FFFFFF"
+        android:textSize="24sp"
+        android:textStyle="bold"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/layout/error_layout.xml b/app/src/main/res/layout/error_layout.xml
@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/Error"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/error"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"/>
+</androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/app/src/main/res/layout/item_post.xml b/app/src/main/res/layout/item_post.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <ImageView
+        android:id="@+id/imageView1"
+        android:layout_width="58dp"
+        android:layout_height="58dp"
+        android:layout_marginStart="16dp"
+        android:layout_marginTop="12dp"
+        android:scaleType="centerCrop"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintHorizontal_bias="0.0"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent"
+        tools:srcCompat="@tools:sample/avatars" />
+
+    <TextView
+        android:id="@+id/textView1"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="21dp"
+        android:textStyle="bold"
+        app:layout_constraintStart_toEndOf="@+id/imageView1"
+        app:layout_constraintTop_toTopOf="@+id/imageView1" />
+
+    <TextView
+        android:id="@+id/textView2"
+        android:layout_width="0dp"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="21dp"
+        android:layout_marginTop="2dp"
+        android:layout_marginEnd="46dp"
+        android:textSize="11sp"
+        app:layout_constraintEnd_toStartOf="@+id/imageView2"
+        app:layout_constraintHorizontal_bias="0.0"
+        app:layout_constraintStart_toEndOf="@+id/imageView1"
+        app:layout_constraintTop_toBottomOf="@+id/textView1" />
+
+    <ImageView
+        android:id="@+id/imageView2"
+        tools:srcCompat="@tools:sample/avatars"
+        android:layout_width="33dp"
+        android:layout_height="33dp"
+        android:layout_marginEnd="17dp"
+        android:scaleType="centerCrop"
+        app:layout_constraintBottom_toBottomOf="@+id/imageView1"
+        app:layout_constraintEnd_toEndOf="parent" />
+</androidx.constraintlayout.widget.ConstraintLayout>