From 57b3d48c547b98f9425e99a709194216d648b847 Mon Sep 17 00:00:00 2001
From: SergeyKozhukhov <sergey.kozhukhov.mail@mail.ru>
Date: Tue, 8 Aug 2023 09:19:13 +0300
Subject: [PATCH] Use Subcomponents

---
 README.md                                     |  9 +++
 app/build.gradle                              | 16 ++++
 app/src/main/AndroidManifest.xml              |  8 +-
 .../main/java/ru/otus/daggerhomework/App.kt   | 22 +++++-
 .../daggerhomework/ApplicationComponent.kt    |  4 -
 .../ru/otus/daggerhomework/ColorGenerator.kt  | 20 -----
 .../otus/daggerhomework/FragmentProducer.kt   | 26 -------
 .../otus/daggerhomework/FragmentReceiver.kt   | 31 --------
 .../ru/otus/daggerhomework/MainActivity.kt    | 12 ---
 .../otus/daggerhomework/ViewModelProducer.kt  | 16 ----
 .../otus/daggerhomework/ViewModelReceiver.kt  | 15 ----
 .../daggerhomework/di/ApplicationComponent.kt | 25 +++++++
 .../di/ApplicationSubcomponentsModule.kt      | 10 +++
 .../di/main/MainActivityComponent.kt          | 32 ++++++++
 .../di/main/MainActivityModule.kt             | 26 +++++++
 .../main/MainActivitySubcomponentsModule.kt   | 11 +++
 .../di/producer/FragmentProducerComponent.kt  | 25 +++++++
 .../di/producer/FragmentProducerModule.kt     | 16 ++++
 .../di/receiver/FragmentReceiverComponent.kt  | 25 +++++++
 .../di/receiver/FragmentReceiverModule.kt     | 16 ++++
 .../di/utils/qualifiers/ActivityContext.kt    | 10 +++
 .../di/utils/qualifiers/ApplicationContext.kt | 10 +++
 .../di/utils/scopes/ActivityScope.kt          | 11 +++
 .../di/utils/scopes/FragmentScope.kt          | 11 +++
 .../ru/otus/daggerhomework/info/README.md     | 16 ++++
 .../daggerhomework/presentation/Activity.kt   | 21 ++++++
 .../presentation/ActivityProvider.kt          | 17 +++++
 .../presentation/color/ColorGenerator.kt      | 13 ++++
 .../presentation/color/ColorGeneratorImpl.kt  | 17 +++++
 .../presentation/producer/FragmentProducer.kt | 38 ++++++++++
 .../producer/ViewModelProducer.kt             | 53 ++++++++++++++
 .../presentation/receiver/ColorUiState.kt     | 26 +++++++
 .../presentation/receiver/FragmentReceiver.kt | 73 +++++++++++++++++++
 .../receiver/ViewModelReceiver.kt             | 64 ++++++++++++++++
 app/src/main/res/drawable/rectangle.xml       | 10 +++
 app/src/main/res/layout/activity_main.xml     | 34 ++++++---
 app/src/main/res/layout/fragment_a.xml        |  1 +
 app/src/main/res/layout/fragment_b.xml        | 13 +++-
 app/src/main/res/values/dimens.xml            | 11 +++
 app/src/main/res/values/strings.xml           |  8 ++
 40 files changed, 684 insertions(+), 138 deletions(-)
 delete mode 100644 app/src/main/java/ru/otus/daggerhomework/ApplicationComponent.kt
 delete mode 100644 app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt
 delete mode 100644 app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt
 delete mode 100644 app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt
 delete mode 100644 app/src/main/java/ru/otus/daggerhomework/MainActivity.kt
 delete mode 100644 app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt
 delete mode 100644 app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/ApplicationComponent.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/ApplicationSubcomponentsModule.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityComponent.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityModule.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/main/MainActivitySubcomponentsModule.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerComponent.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerModule.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverComponent.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverModule.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ActivityContext.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ApplicationContext.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/ActivityScope.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/FragmentScope.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/info/README.md
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/Activity.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/ActivityProvider.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGenerator.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGeneratorImpl.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/producer/FragmentProducer.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/producer/ViewModelProducer.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ColorUiState.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/receiver/FragmentReceiver.kt
 create mode 100644 app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ViewModelReceiver.kt
 create mode 100644 app/src/main/res/drawable/rectangle.xml
 create mode 100644 app/src/main/res/values/dimens.xml

diff --git a/README.md b/README.md
index 4d77164a..0e922acf 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,7 @@
+# Dagger2
+
+## Задача
+
 ### Реализуйте ApplicationComponent
 Это корень нашего дерева компонентов. Инициализируется в классе App, прокидывает в граф через Component Dependencies/Subcomponents ниже по графу следующие сущности:
 - Context(Application) до FragmentProducerComponent и FragmentReceiverComponent. 
@@ -12,3 +16,8 @@
 Коммуникацию между Producer и Receiver осуществите через канал/StateFlow/Subject либо другую реализацию обсервера которая уже есть в графе. ViewModelProducer должна отправлять эвенты, ViewModelReceiver должна получать эвенты. Обсерверы должны прокидываться в конструкторы вьюмоделей и существовать в единственном экземпляре в Activity.
 Флоу отправки эвента выглядит следующим образом:
 Клик на кнопку button в FragmentProducer -> вызов метода вьюмодели -> проброс евента в обсервер -> евент ловится на стороне ViewModelReceiver -> евент передается FragmentReceiver и вызывается функция ru.otus.daggerhomework.FragmentReceiver#populateColor
+
+## Решение
+
+Решение базируется на Subcomponents.
+В качестве канала коммуникации между франментами использован Channel. 
\ No newline at end of file
diff --git a/app/build.gradle b/app/build.gradle
index 705d0941..fdc1edb1 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -38,6 +38,22 @@ dependencies {
     implementation 'androidx.appcompat:appcompat:1.3.1'
     implementation 'com.google.android.material:material:1.4.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
+
+    // dagger2
     implementation 'com.google.dagger:dagger:2.42'
     kapt 'com.google.dagger:dagger-compiler:2.42'
+
+    // coroutines
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.4'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4'
+
+    //
+    /* lifecircle */
+    def lifecycle_version = "2.5.1"
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
+
+    /* extensions to simplify the fragment API  */
+    implementation "androidx.fragment:fragment-ktx:1.5.5"
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index fe328c68..316a9d64 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -1,16 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="ru.otus.daggerhomework">
 
     <application
+        android:name=".App"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/Theme.DaggerHomework">
-        <activity android:name=".MainActivity">
+        <activity
+            android:name=".presentation.Activity"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
diff --git a/app/src/main/java/ru/otus/daggerhomework/App.kt b/app/src/main/java/ru/otus/daggerhomework/App.kt
index de363626..dfd483ea 100644
--- a/app/src/main/java/ru/otus/daggerhomework/App.kt
+++ b/app/src/main/java/ru/otus/daggerhomework/App.kt
@@ -1,6 +1,26 @@
 package ru.otus.daggerhomework
 
 import android.app.Application
+import android.content.Context
+import ru.otus.daggerhomework.di.ApplicationComponent
+import ru.otus.daggerhomework.di.DaggerApplicationComponent
 
-class App :Application() {
+/**
+ * `Custom application` приложения
+ */
+class App : Application() {
+
+    private lateinit var applicationComponent: ApplicationComponent
+
+    override fun onCreate() {
+        super.onCreate()
+        applicationComponent = DaggerApplicationComponent.factory().create(this)
+    }
+
+    companion object {
+
+        /** Получить [applicationComponent] на основе [context] */
+        fun appComponent(context: Context) =
+            (context.applicationContext as App).applicationComponent
+    }
 }
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/ApplicationComponent.kt b/app/src/main/java/ru/otus/daggerhomework/ApplicationComponent.kt
deleted file mode 100644
index fc47f256..00000000
--- a/app/src/main/java/ru/otus/daggerhomework/ApplicationComponent.kt
+++ /dev/null
@@ -1,4 +0,0 @@
-package ru.otus.daggerhomework
-
-interface ApplicationComponent {
-}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt b/app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt
deleted file mode 100644
index a9e25a27..00000000
--- a/app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt
+++ /dev/null
@@ -1,20 +0,0 @@
-package ru.otus.daggerhomework
-
-import android.graphics.Color
-import androidx.annotation.ColorInt
-import androidx.annotation.ColorRes
-import java.util.*
-
-interface ColorGenerator {
-
-    @ColorInt
-    fun generateColor(): Int
-}
-
-class ColorGeneratorImpl : ColorGenerator {
-
-    override fun generateColor(): Int {
-        val rnd = Random()
-        return Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256))
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt b/app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt
deleted file mode 100644
index 00dd10dc..00000000
--- a/app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt
+++ /dev/null
@@ -1,26 +0,0 @@
-package ru.otus.daggerhomework
-
-import android.os.Bundle
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import android.widget.Button
-import androidx.fragment.app.Fragment
-
-class FragmentProducer : Fragment() {
-
-    override fun onCreateView(
-        inflater: LayoutInflater,
-        container: ViewGroup?,
-        savedInstanceState: Bundle?
-    ): View? {
-        return inflater.inflate(R.layout.fragment_a, container, true)
-    }
-
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-        view.findViewById<Button>(R.id.button).setOnClickListener {
-            //отправить результат через livedata в другой фрагмент
-        }
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt b/app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt
deleted file mode 100644
index e6a3d9af..00000000
--- a/app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt
+++ /dev/null
@@ -1,31 +0,0 @@
-package ru.otus.daggerhomework
-
-import android.os.Bundle
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import android.widget.Button
-import androidx.annotation.ColorInt
-import androidx.fragment.app.Fragment
-
-class FragmentReceiver : Fragment() {
-
-    private lateinit var frame: View
-
-    override fun onCreateView(
-        inflater: LayoutInflater,
-        container: ViewGroup?,
-        savedInstanceState: Bundle?
-    ): View? {
-        return inflater.inflate(R.layout.fragment_b, container, true)
-    }
-
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-        frame = view.findViewById(R.id.frame)
-    }
-
-    fun populateColor(@ColorInt color: Int) {
-        frame.setBackgroundColor(color)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/MainActivity.kt b/app/src/main/java/ru/otus/daggerhomework/MainActivity.kt
deleted file mode 100644
index 1b85e946..00000000
--- a/app/src/main/java/ru/otus/daggerhomework/MainActivity.kt
+++ /dev/null
@@ -1,12 +0,0 @@
-package ru.otus.daggerhomework
-
-import androidx.appcompat.app.AppCompatActivity
-import android.os.Bundle
-
-class MainActivity : AppCompatActivity() {
-
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        setContentView(R.layout.activity_main)
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt b/app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt
deleted file mode 100644
index bc035089..00000000
--- a/app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt
+++ /dev/null
@@ -1,16 +0,0 @@
-package ru.otus.daggerhomework
-
-import android.content.Context
-import android.widget.Toast
-import androidx.fragment.app.FragmentActivity
-
-class ViewModelProducer(
-    private val colorGenerator: ColorGenerator,
-    private val context: Context
-) {
-
-    fun generateColor() {
-        if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
-        Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt b/app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt
deleted file mode 100644
index 8a3a5ead..00000000
--- a/app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt
+++ /dev/null
@@ -1,15 +0,0 @@
-package ru.otus.daggerhomework
-
-import android.app.Application
-import android.content.Context
-import android.widget.Toast
-
-class ViewModelReceiver(
-    private val context: Context
-) {
-
-    fun observeColors() {
-        if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
-        Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
-    }
-}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/ApplicationComponent.kt b/app/src/main/java/ru/otus/daggerhomework/di/ApplicationComponent.kt
new file mode 100644
index 00000000..e23cf74d
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/ApplicationComponent.kt
@@ -0,0 +1,25 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import ru.otus.daggerhomework.di.main.MainActivityComponent
+import ru.otus.daggerhomework.di.utils.qualifiers.ApplicationContext
+
+/**
+ * `Dagger` [Component] приложения
+ */
+@Component(modules = [ApplicationSubcomponentsModule::class])
+interface ApplicationComponent {
+
+    /** Фабрика `Dagger` [Component]-а главного экрана */
+    val mainActivityComponentFactory: MainActivityComponent.Factory
+
+    /** Фабрика `Dagger` [Component]-а приложения */
+    @Component.Factory
+    interface Factory {
+
+        /** Создать [ApplicationComponent] на основе `Application` контекста [context] */
+        fun create(@BindsInstance @ApplicationContext context: Context): ApplicationComponent
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/ApplicationSubcomponentsModule.kt b/app/src/main/java/ru/otus/daggerhomework/di/ApplicationSubcomponentsModule.kt
new file mode 100644
index 00000000..e10943ba
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/ApplicationSubcomponentsModule.kt
@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Module
+import ru.otus.daggerhomework.di.main.MainActivityComponent
+
+/**
+ * `Dagger` [Module] `subcomponent`-ов приложения
+ */
+@Module(subcomponents = [MainActivityComponent::class])
+interface ApplicationSubcomponentsModule
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityComponent.kt b/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityComponent.kt
new file mode 100644
index 00000000..0d79028a
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityComponent.kt
@@ -0,0 +1,32 @@
+package ru.otus.daggerhomework.di.main
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import dagger.Subcomponent
+import ru.otus.daggerhomework.di.producer.FragmentProducerComponent
+import ru.otus.daggerhomework.di.receiver.FragmentReceiverComponent
+import ru.otus.daggerhomework.di.utils.qualifiers.ActivityContext
+import ru.otus.daggerhomework.di.utils.scopes.ActivityScope
+
+/**
+ * `Dagger` [Component] главного экрана
+ */
+@ActivityScope
+@Subcomponent(modules = [MainActivityModule::class, MainActivitySubcomponentsModule::class])
+interface MainActivityComponent {
+
+    /** Фабрика `Dagger` [Component]-а Fragment`-а поставления цветов */
+    val fragmentProducerComponentFactory: FragmentProducerComponent.Factory
+
+    /** Фабрика `Dagger` [Component]-а Fragment`-а получения цветов */
+    val fragmentReceiverComponentFactory: FragmentReceiverComponent.Factory
+
+    /** Фабрика `Dagger` [Component]-а главного экрана */
+    @Subcomponent.Factory
+    interface Factory {
+
+        /** Создать [MainActivityComponent] на основе контекста `Activity` [context] */
+        fun create(@BindsInstance @ActivityContext context: Context): MainActivityComponent
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityModule.kt b/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityModule.kt
new file mode 100644
index 00000000..1a167f80
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivityModule.kt
@@ -0,0 +1,26 @@
+package ru.otus.daggerhomework.di.main
+
+import dagger.Binds
+import dagger.Module
+import dagger.Provides
+import kotlinx.coroutines.channels.Channel
+import ru.otus.daggerhomework.di.utils.scopes.ActivityScope
+import ru.otus.daggerhomework.presentation.color.ColorGenerator
+import ru.otus.daggerhomework.presentation.color.ColorGeneratorImpl
+
+/**
+ * `Dagger` [Module] главного экрана
+ */
+@Module
+interface MainActivityModule {
+
+    @Binds
+    fun bindColorGenerator(colorGenerator: ColorGeneratorImpl): ColorGenerator
+
+    companion object {
+
+        @ActivityScope
+        @Provides
+        fun provideChannel(): Channel<Int> = Channel(Channel.CONFLATED)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivitySubcomponentsModule.kt b/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivitySubcomponentsModule.kt
new file mode 100644
index 00000000..87bbb344
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/main/MainActivitySubcomponentsModule.kt
@@ -0,0 +1,11 @@
+package ru.otus.daggerhomework.di.main
+
+import dagger.Module
+import ru.otus.daggerhomework.di.producer.FragmentProducerComponent
+import ru.otus.daggerhomework.di.receiver.FragmentReceiverComponent
+
+/**
+ * `Dagger` [Module] `subcomponent`-ов главного экрана
+ */
+@Module(subcomponents = [FragmentProducerComponent::class, FragmentReceiverComponent::class])
+interface MainActivitySubcomponentsModule
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerComponent.kt b/app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerComponent.kt
new file mode 100644
index 00000000..ba2cdefb
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerComponent.kt
@@ -0,0 +1,25 @@
+package ru.otus.daggerhomework.di.producer
+
+import dagger.Component
+import dagger.Subcomponent
+import ru.otus.daggerhomework.di.utils.scopes.FragmentScope
+import ru.otus.daggerhomework.presentation.producer.FragmentProducer
+
+/**
+ * `Dagger` [Component] `Fragment`-а поставления цветов
+ */
+@FragmentScope
+@Subcomponent(modules = [FragmentProducerModule::class])
+interface FragmentProducerComponent {
+
+    /** Внедрить зависимости [FragmentProducer]-а */
+    fun inject(producer: FragmentProducer)
+
+    /** Фабрика `Dagger` [Component]-а Fragment`-а поставления цветов */
+    @Subcomponent.Factory
+    interface Factory {
+
+        /** Создать [FragmentProducerComponent] */
+        fun create(): FragmentProducerComponent
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerModule.kt b/app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerModule.kt
new file mode 100644
index 00000000..43c944b8
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/producer/FragmentProducerModule.kt
@@ -0,0 +1,16 @@
+package ru.otus.daggerhomework.di.producer
+
+import dagger.Binds
+import dagger.Module
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.SendChannel
+
+/**
+ * `Dagger` [Module] `Fragment`-а поставления цветов
+ */
+@Module
+interface FragmentProducerModule {
+
+    @Binds
+    fun bindSendChannel(channel: Channel<Int>): SendChannel<Int>
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverComponent.kt b/app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverComponent.kt
new file mode 100644
index 00000000..a98bcd73
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverComponent.kt
@@ -0,0 +1,25 @@
+package ru.otus.daggerhomework.di.receiver
+
+import dagger.Component
+import dagger.Subcomponent
+import ru.otus.daggerhomework.di.utils.scopes.FragmentScope
+import ru.otus.daggerhomework.presentation.receiver.FragmentReceiver
+
+/**
+ * `Dagger` [Component] `Fragment`-а получения цветов
+ */
+@FragmentScope
+@Subcomponent(modules = [FragmentReceiverModule::class])
+interface FragmentReceiverComponent {
+
+    /** Внедрить зависимости [FragmentReceiver]-а */
+    fun inject(receiver: FragmentReceiver)
+
+    /** Фабрика `Dagger` [Component]-а Fragment`-а получения цветов */
+    @Subcomponent.Factory
+    interface Factory {
+
+        /** Создать [FragmentReceiverComponent] */
+        fun create(): FragmentReceiverComponent
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverModule.kt b/app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverModule.kt
new file mode 100644
index 00000000..8e06df8e
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/receiver/FragmentReceiverModule.kt
@@ -0,0 +1,16 @@
+package ru.otus.daggerhomework.di.receiver
+
+import dagger.Binds
+import dagger.Module
+import kotlinx.coroutines.channels.Channel
+import kotlinx.coroutines.channels.ReceiveChannel
+
+/**
+ * `Dagger` [Module] `Fragment`-а получения цветов
+ */
+@Module
+interface FragmentReceiverModule {
+
+    @Binds
+    fun bindReceiveChannel(channel: Channel<Int>): ReceiveChannel<Int>
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ActivityContext.kt b/app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ActivityContext.kt
new file mode 100644
index 00000000..3afaeda8
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ActivityContext.kt
@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework.di.utils.qualifiers
+
+import javax.inject.Qualifier
+
+/**
+ * Индикатор `Activity` контекста
+ */
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityContext
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ApplicationContext.kt b/app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ApplicationContext.kt
new file mode 100644
index 00000000..2a1b5ec8
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/utils/qualifiers/ApplicationContext.kt
@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework.di.utils.qualifiers
+
+import javax.inject.Qualifier
+
+/**
+ * Индикатор `Application` контекста
+ */
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ApplicationContext
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/ActivityScope.kt b/app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/ActivityScope.kt
new file mode 100644
index 00000000..cf062cae
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/ActivityScope.kt
@@ -0,0 +1,11 @@
+package ru.otus.daggerhomework.di.utils.scopes
+
+import javax.inject.Scope
+
+/**
+ * Индикатор области существования зависимостей `Activity`
+ */
+@Scope
+@MustBeDocumented
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityScope
diff --git a/app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/FragmentScope.kt b/app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/FragmentScope.kt
new file mode 100644
index 00000000..55a5e84e
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/di/utils/scopes/FragmentScope.kt
@@ -0,0 +1,11 @@
+package ru.otus.daggerhomework.di.utils.scopes
+
+import javax.inject.Scope
+
+/**
+ * Индикатор области существования зависимостей `Fragment`-а
+ */
+@Scope
+@MustBeDocumented
+@Retention(AnnotationRetention.RUNTIME)
+annotation class FragmentScope
diff --git a/app/src/main/java/ru/otus/daggerhomework/info/README.md b/app/src/main/java/ru/otus/daggerhomework/info/README.md
new file mode 100644
index 00000000..67694313
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/info/README.md
@@ -0,0 +1,16 @@
+# Links
+
+### Questions
+
+1. [Dagger 2 Tutorial for Android: Advanced – Part 2](https://www.kodeco.com/7337181-dagger-2-tutorial-for-android-advanced-part-2)
+2. [Dagger Core Semantics](https://dagger.dev/semantics/)
+3. [ShareIn vs StateIn: когда использовать каждый](https://digitrain.ru/articles/690862/)
+4. [Dagger2 with @JvmSuppressWildcards](https://dagger.dev/dev-guide/multibindings.html)
+5. [Using Dagger in Android apps](https://developer.android.com/training/dependency-injection/dagger-android)
+6. [Dagger inject: best practice](https://developer.android.google.cn/codelabs/android-dagger#9)
+7. [Correct places for injection](https://funkymuse.dev/posts/dagger-part-6/)
+8. [View binding](https://developer.android.com/topic/libraries/view-binding)
+
+
+
+
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/Activity.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/Activity.kt
new file mode 100644
index 00000000..6bd32a58
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/Activity.kt
@@ -0,0 +1,21 @@
+package ru.otus.daggerhomework.presentation
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import ru.otus.daggerhomework.App
+import ru.otus.daggerhomework.R
+import ru.otus.daggerhomework.di.main.MainActivityComponent
+
+/**
+ * Главный экран
+ */
+class Activity : AppCompatActivity(), ActivityProvider {
+
+    override lateinit var mainActivityComponent: MainActivityComponent
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        mainActivityComponent = App.appComponent(this).mainActivityComponentFactory.create(this)
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/ActivityProvider.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/ActivityProvider.kt
new file mode 100644
index 00000000..eef43edc
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/ActivityProvider.kt
@@ -0,0 +1,17 @@
+package ru.otus.daggerhomework.presentation
+
+import androidx.fragment.app.Fragment
+import dagger.Component
+import ru.otus.daggerhomework.di.main.MainActivityComponent
+
+/**
+ * Поставщик элементов главного экрана
+ */
+interface ActivityProvider {
+
+    /** `Dagger` [Component] главного экрана */
+    val mainActivityComponent: MainActivityComponent
+}
+
+/** Получить [ActivityProvider] */
+fun Fragment.provider() = requireActivity() as ActivityProvider
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGenerator.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGenerator.kt
new file mode 100644
index 00000000..42b181ed
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGenerator.kt
@@ -0,0 +1,13 @@
+package ru.otus.daggerhomework.presentation.color
+
+import androidx.annotation.ColorInt
+
+/**
+ * Генератор цветов
+ */
+interface ColorGenerator {
+
+    /** Сгенерировать числовое представление цвета в виде [Int] */
+    @ColorInt
+    fun generateColor(): Int
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGeneratorImpl.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGeneratorImpl.kt
new file mode 100644
index 00000000..c9448360
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/color/ColorGeneratorImpl.kt
@@ -0,0 +1,17 @@
+package ru.otus.daggerhomework.presentation.color
+
+import android.graphics.Color
+import java.util.Random
+import javax.inject.Inject
+
+/**
+ * Реализация [ColorGeneratorImpl]
+ */
+class ColorGeneratorImpl @Inject constructor() : ColorGenerator {
+
+    private val rnd = Random()
+
+    override fun generateColor() = Color.argb(255, generateNext(), generateNext(), generateNext())
+
+    private fun generateNext() = rnd.nextInt(256)
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/producer/FragmentProducer.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/producer/FragmentProducer.kt
new file mode 100644
index 00000000..aee27a25
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/producer/FragmentProducer.kt
@@ -0,0 +1,38 @@
+package ru.otus.daggerhomework.presentation.producer
+
+import android.content.Context
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Button
+import androidx.fragment.app.Fragment
+import ru.otus.daggerhomework.R
+import ru.otus.daggerhomework.presentation.provider
+import javax.inject.Inject
+
+/**
+ * `Fragment`-а поставления цветов
+ */
+class FragmentProducer : Fragment() {
+
+    @Inject
+    lateinit var producer: ViewModelProducer
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        provider().mainActivityComponent.fragmentProducerComponentFactory.create().inject(this)
+        lifecycle.addObserver(producer)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? = inflater.inflate(R.layout.fragment_a, container, false)
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        view.findViewById<Button>(R.id.button).setOnClickListener { producer.generateColor() }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/producer/ViewModelProducer.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/producer/ViewModelProducer.kt
new file mode 100644
index 00000000..24b20308
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/producer/ViewModelProducer.kt
@@ -0,0 +1,53 @@
+package ru.otus.daggerhomework.presentation.producer
+
+import android.content.Context
+import android.widget.Toast
+import androidx.annotation.ColorInt
+import androidx.fragment.app.FragmentActivity
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.channels.SendChannel
+import kotlinx.coroutines.launch
+import ru.otus.daggerhomework.R
+import ru.otus.daggerhomework.di.utils.qualifiers.ActivityContext
+import ru.otus.daggerhomework.presentation.color.ColorGenerator
+import javax.inject.Inject
+
+/**
+ * Имитация `ViewModel` поставщика цветов
+ *
+ * @param channel канал передачи числовых значений
+ * @param colorGenerator генератор цветов
+ * @param context `activity` контекст
+ */
+class ViewModelProducer @Inject constructor(
+    private val channel: SendChannel<@JvmSuppressWildcards Int>,
+    private val colorGenerator: ColorGenerator,
+    @ActivityContext private val context: Context
+) : DefaultLifecycleObserver {
+
+    init {
+        if (context !is FragmentActivity) throw RuntimeException(context.resources.getString(R.string.activity_context_requirement))
+    }
+
+    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
+
+    /** Сгенерировать и передать новый цвет */
+    fun generateColor() {
+        val newColor = colorGenerator.generateColor()
+        showToast(newColor)
+        scope.launch {
+            channel.send(element = newColor)
+        }
+    }
+
+    private fun showToast(@ColorInt color: Int) =
+        Toast.makeText(context, context.getString(R.string.color_sent, color), Toast.LENGTH_SHORT)
+            .show()
+
+    override fun onDestroy(owner: LifecycleOwner) = scope.cancel()
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ColorUiState.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ColorUiState.kt
new file mode 100644
index 00000000..7860c901
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ColorUiState.kt
@@ -0,0 +1,26 @@
+package ru.otus.daggerhomework.presentation.receiver
+
+import androidx.annotation.ColorInt
+
+/**
+ * UI состояние экрана цвета
+ */
+sealed interface ColorUiState {
+
+    /** Бездействие */
+    object Idle : ColorUiState
+
+    /**
+     * Значение цвета
+     *
+     * @property color числовое представление цвета в виде
+     */
+    data class Success(@ColorInt val color: Int) : ColorUiState
+
+    /**
+     * Ошибка
+     *
+     * @property message сообщение об ошибке
+     */
+    data class Error(val message: String) : ColorUiState
+}
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/FragmentReceiver.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/FragmentReceiver.kt
new file mode 100644
index 00000000..abe70bcf
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/FragmentReceiver.kt
@@ -0,0 +1,73 @@
+package ru.otus.daggerhomework.presentation.receiver
+
+import android.content.Context
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.annotation.ColorInt
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import kotlinx.coroutines.launch
+import ru.otus.daggerhomework.R
+import ru.otus.daggerhomework.presentation.provider
+import javax.inject.Inject
+
+/**
+ * `Fragment`-а получения цветов
+ */
+class FragmentReceiver : Fragment() {
+
+    private var _frame: View? = null
+    private var _textView: TextView? = null
+
+    private val frame: View get() = _frame!!
+    private val textView: TextView get() = _textView!!
+
+    @Inject
+    lateinit var receiver: ViewModelReceiver
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        provider().mainActivityComponent.fragmentReceiverComponentFactory.create().inject(this)
+        lifecycle.addObserver(receiver)
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?
+    ): View? = inflater.inflate(R.layout.fragment_b, container, false)
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        super.onViewCreated(view, savedInstanceState)
+        _frame = view.findViewById(R.id.frame)
+        _textView = view.findViewById(R.id.color_text_view)
+
+        viewLifecycleOwner.lifecycleScope.launch {
+            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                receiver.uiState.collect { state -> renderUi(state) }
+            }
+        }
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _frame = null
+        _textView = null
+    }
+
+    private fun renderUi(state: ColorUiState) {
+        when (state) {
+            ColorUiState.Idle -> textView.text = getString(R.string.empty)
+            is ColorUiState.Success -> populateColor(state.color)
+            is ColorUiState.Error -> textView.text = state.message
+        }
+    }
+
+    private fun populateColor(@ColorInt color: Int) {
+        textView.text = color.toString()
+        frame.setBackgroundColor(color)
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ViewModelReceiver.kt b/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ViewModelReceiver.kt
new file mode 100644
index 00000000..37c85b07
--- /dev/null
+++ b/app/src/main/java/ru/otus/daggerhomework/presentation/receiver/ViewModelReceiver.kt
@@ -0,0 +1,64 @@
+package ru.otus.daggerhomework.presentation.receiver
+
+import android.app.Application
+import android.content.Context
+import android.widget.Toast
+import androidx.annotation.ColorInt
+import androidx.lifecycle.DefaultLifecycleObserver
+import androidx.lifecycle.LifecycleOwner
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.SupervisorJob
+import kotlinx.coroutines.cancel
+import kotlinx.coroutines.channels.ReceiveChannel
+import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.receiveAsFlow
+import kotlinx.coroutines.flow.stateIn
+import ru.otus.daggerhomework.R
+import ru.otus.daggerhomework.di.utils.qualifiers.ApplicationContext
+import javax.inject.Inject
+
+/**
+ * Имитация `ViewModel` получения цветов
+ *
+ * @param channel канал получения числовых значений
+ * @param context `application` контекст
+ */
+class ViewModelReceiver @Inject constructor(
+    channel: ReceiveChannel<@JvmSuppressWildcards Int>,
+    @ApplicationContext private val context: Context
+) : DefaultLifecycleObserver {
+
+    init {
+        if (context !is Application) throw RuntimeException(context.resources.getString(R.string.application_context_requirement))
+    }
+
+    private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Main.immediate)
+
+    /** UI состояние цвета */
+    val uiState = channel.receiveAsFlow()
+        .onEach { color -> showToast(color) }
+        .map { color -> ColorUiState.Success(color) as ColorUiState }
+        .catch { e ->
+            if (e !is CancellationException) {
+                emit(ColorUiState.Error(e.toString()))
+            } else {
+                throw e
+            }
+        }.stateIn(
+            scope = scope,
+            started = SharingStarted.WhileSubscribed(),
+            initialValue = ColorUiState.Idle
+        )
+
+    private fun showToast(@ColorInt color: Int) =
+        Toast.makeText(
+            context, context.getString(R.string.color_received, color), Toast.LENGTH_SHORT
+        ).show()
+
+    override fun onDestroy(owner: LifecycleOwner) = scope.cancel()
+}
\ No newline at end of file
diff --git a/app/src/main/res/drawable/rectangle.xml b/app/src/main/res/drawable/rectangle.xml
new file mode 100644
index 00000000..98ee1da8
--- /dev/null
+++ b/app/src/main/res/drawable/rectangle.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+
+    <stroke
+        android:width="@dimen/width_rectangle"
+        android:color="@color/black"
+        android:dashWidth="@dimen/width_dash_rectangle"
+        android:dashGap="@dimen/gap_dash_rectangle" />
+</shape>
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 79ae6993..07df0a21 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -1,19 +1,35 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<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="match_parent"
-    tools:context=".MainActivity">
+    tools:context=".presentation.Activity">
 
-    <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"
+
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/receiver_container"
+        android:name="ru.otus.daggerhomework.presentation.receiver.FragmentReceiver"
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/match_constraint"
+        android:layout_margin="@dimen/little_margin"
+        android:foreground="@drawable/rectangle"
+        android:padding="@dimen/little_padding"
+        app:layout_constraintBottom_toTopOf="@id/producer_container"
         app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/producer_container"
+        android:name="ru.otus.daggerhomework.presentation.producer.FragmentProducer"
+        android:layout_width="match_parent"
+        android:layout_height="@dimen/match_constraint"
+        android:layout_margin="@dimen/little_margin"
+        android:foreground="@drawable/rectangle"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toBottomOf="@id/receiver_container" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_a.xml b/app/src/main/res/layout/fragment_a.xml
index 3ca899bb..e8d3afbc 100644
--- a/app/src/main/res/layout/fragment_a.xml
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -14,4 +14,5 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_b.xml b/app/src/main/res/layout/fragment_b.xml
index 4edb4339..5d37440c 100644
--- a/app/src/main/res/layout/fragment_b.xml
+++ b/app/src/main/res/layout/fragment_b.xml
@@ -1,5 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/frame"
     android:layout_width="match_parent"
-    android:layout_height="match_parent" />
\ No newline at end of file
+    android:layout_height="match_parent">
+
+    <TextView
+        android:id="@+id/color_text_view"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center"
+        style="@style/TextAppearance.AppCompat.Display1"
+        tools:text="color" />
+
+</FrameLayout>
\ No newline at end of file
diff --git a/app/src/main/res/values/dimens.xml b/app/src/main/res/values/dimens.xml
new file mode 100644
index 00000000..417864ab
--- /dev/null
+++ b/app/src/main/res/values/dimens.xml
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<resources>
+    <dimen name="match_constraint">0dp</dimen>
+    <dimen name="little_margin">4dp</dimen>
+    <dimen name="little_padding">4dp</dimen>
+
+    <dimen name="width_rectangle">1dp</dimen>
+    <dimen name="width_dash_rectangle">4dp</dimen>
+    <dimen name="gap_dash_rectangle">4dp</dimen>
+</resources>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d499dbe6..6b9a5db3 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1,4 +1,12 @@
 <resources>
     <string name="app_name">DaggerHomework</string>
     <string name="generate_color">Generate Color</string>
+
+    <string name="application_context_requirement">You need application context</string>
+    <string name="activity_context_requirement">You need activity context</string>
+
+    <string name="color_sent">Color sent: %1$d</string>
+    <string name="color_received">Color received: %1$d</string>
+
+    <string name="empty">Empty</string>
 </resources>
\ No newline at end of file