better late than never, sorry for delay

app/build.gradle

@@ -5,13 +5,13 @@ plugins {
 }
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
     buildToolsVersion "30.0.3"
 
     defaultConfig {
         applicationId "ru.otus.daggerhomework"
         minSdkVersion 23
-        targetSdkVersion 30
+        targetSdkVersion 31
         versionCode 1
         versionName "1.0"
 
@@ -34,11 +34,17 @@ android {
 }
 
 dependencies {
+    def lifecycle_version = '2.4.0'
+
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    implementation 'androidx.core:core-ktx:1.6.0'
-    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.4.0'
     implementation 'com.google.android.material:material:1.4.0'
-    implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.2'
     implementation 'com.google.dagger:dagger:2.38.1'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.1'
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-runtime-ktx:$lifecycle_version"
+    implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version"
     kapt 'com.google.dagger:dagger-compiler:2.38.1'
 }

app/src/main/AndroidManifest.xml

@@ -4,13 +4,15 @@
     package="ru.otus.daggerhomework">
 
     <application
-        android:allowBackup="true"
+        android:allowBackup="false"
+        android:name=".App"
         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=".MainActivity"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

app/src/main/java/ru/otus/daggerhomework/App.kt

@@ -1,6 +1,15 @@
 package ru.otus.daggerhomework
 
 import android.app.Application
+import ru.otus.daggerhomework.di.ApplicationComponent
+import ru.otus.daggerhomework.di.DaggerApplicationComponent
 
-class App :Application() {
+class App: Application() {
+
+  lateinit var applicationComponent: ApplicationComponent
+
+  override fun onCreate() {
+    super.onCreate()
+    applicationComponent = DaggerApplicationComponent.factory().create(this)
+  }
 }

app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt

@@ -2,16 +2,16 @@ package ru.otus.daggerhomework
 
 import android.graphics.Color
 import androidx.annotation.ColorInt
-import androidx.annotation.ColorRes
 import java.util.*
+import javax.inject.Inject
 
 interface ColorGenerator {
 
     @ColorInt
     fun generateColor(): Int
 }
 
-class ColorGeneratorImpl : ColorGenerator {
+class ColorGeneratorImpl @Inject constructor(): ColorGenerator {
 
     override fun generateColor(): Int {
         val rnd = Random()

app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt

@@ -6,21 +6,36 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import ru.otus.daggerhomework.di.DaggerFragmentProducerComponent
+import ru.otus.daggerhomework.di.ViewModelFactory
+import ru.otus.daggerhomework.di.injectViewModel
+import javax.inject.Inject
 
 class FragmentProducer : Fragment() {
 
+    @Inject
+    lateinit var factory: ViewModelFactory
+    private lateinit var producerViewModel: ViewModelProducer
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_a, container, true)
+        DaggerFragmentProducerComponent
+            .builder()
+            .mainActivityComponent((requireActivity() as MainActivity).activityComponent)
+            .build()
+            .inject(this)
+        producerViewModel = injectViewModel(factory)
+        return 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 {
             //отправить результат через livedata в другой фрагмент
+            producerViewModel.generateColor()
         }
     }
 }

app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt

@@ -4,28 +4,58 @@ 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
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import kotlinx.coroutines.launch
+import ru.otus.daggerhomework.di.DaggerFragmentReceiverComponent
+import ru.otus.daggerhomework.di.ViewModelFactory
+import ru.otus.daggerhomework.di.injectViewModel
+import javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
 
     private lateinit var frame: View
 
+    @Inject
+    lateinit var factory:  ViewModelFactory
+    private lateinit var receiverViewModel: ViewModelReceiver
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_b, container, true)
+        DaggerFragmentReceiverComponent
+            .builder()
+            .mainActivityComponent((requireActivity() as MainActivity).activityComponent)
+            .build()
+            .inject(this)
+        receiverViewModel = injectViewModel(factory)
+        return 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)
+//        with(viewLifecycleOwner) {
+//            lifecycleScope.launch {
+//                repeatOnLifecycle(Lifecycle.State.CREATED) {
+//                    receiverViewModel.observeColors { populateColor(it) }
+//                }
+//            }
+//        }
+        receiverViewModel.observeColors { populateColor(it) }
     }
 
-    fun populateColor(@ColorInt color: Int) {
+    private fun populateColor(@ColorInt color: Int) {
         frame.setBackgroundColor(color)
     }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        receiverViewModel.stopObservingColors()
+    }
 }

app/src/main/java/ru/otus/daggerhomework/MainActivity.kt

@@ -2,10 +2,22 @@ package ru.otus.daggerhomework
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import ru.otus.daggerhomework.di.DaggerMainActivityComponent
+import ru.otus.daggerhomework.di.MainActivityComponent
 
 class MainActivity : AppCompatActivity() {
+
+    lateinit var activityComponent: MainActivityComponent
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        activityComponent = DaggerMainActivityComponent.factory()
+            .create(this, (application as App).applicationComponent)
+        supportFragmentManager
+            .beginTransaction()
+            .add(R.id.container, FragmentReceiver())
+            .add(R.id.container, FragmentProducer())
+            .commit()
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt

@@ -1,19 +1,25 @@
 package ru.otus.daggerhomework
 
-import android.app.Activity
+import android.annotation.SuppressLint
 import android.content.Context
 import android.widget.Toast
 import androidx.fragment.app.FragmentActivity
 import androidx.lifecycle.ViewModel
+import kotlinx.coroutines.flow.MutableStateFlow
 import java.lang.RuntimeException
+import javax.inject.Inject
+import javax.inject.Named
 
-class ViewModelProducer(
+@SuppressLint("StaticFieldLeak")
+class ViewModelProducer @Inject constructor(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
+    @Named("activity") private val context: Context,
+    private val state: MutableStateFlow<Int>
 ) : ViewModel() {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        state.value = colorGenerator.generateColor()
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt

@@ -1,18 +1,38 @@
 package ru.otus.daggerhomework
 
+import android.annotation.SuppressLint
 import android.app.Application
 import android.content.Context
 import android.widget.Toast
-import androidx.fragment.app.FragmentActivity
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
 import java.lang.RuntimeException
+import javax.inject.Inject
+import javax.inject.Named
 
-class ViewModelReceiver(
-    private val context: Context
+@SuppressLint("StaticFieldLeak")
+class ViewModelReceiver @Inject constructor(
+    @Named("application") private val context: Context,
+    private val state: MutableStateFlow<Int>
 ) : ViewModel() {
 
-    fun observeColors() {
+    private var colorUpdatesJob: Job? = null
+
+    fun observeColors(action: ((Int) -> Unit)?) {
         if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
-        Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+        colorUpdatesJob = viewModelScope.launch {
+            state.collect {
+                Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+                action?.invoke(it)
+            }
+        }
+    }
+
+    fun stopObservingColors() {
+        colorUpdatesJob?.cancel()
     }
-}
+}

app/src/main/java/ru/otus/daggerhomework/di/ApplicationComponent.kt

@@ -0,0 +1,27 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import javax.inject.Named
+import javax.inject.Scope
+import javax.inject.Singleton
+
+@Singleton
+@Component
+interface ApplicationComponent {
+
+  @Named("application")
+  fun provideAppContext(): Context
+
+  @Component.Factory
+  interface Factory {
+    fun create(@BindsInstance @Named("application") appContext: Context): ApplicationComponent
+  }
+}
+
+@Scope
+annotation class ActivityScope
+
+@Scope
+annotation class FragmentScope

app/src/main/java/ru/otus/daggerhomework/di/FragmentProducerComponent.kt

@@ -0,0 +1,13 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Component
+import ru.otus.daggerhomework.FragmentProducer
+
+@FragmentScope
+@Component(dependencies = [MainActivityComponent::class], modules = [FragmentProducerModule::class])
+interface FragmentProducerComponent {
+  fun inject(producer: FragmentProducer)
+}
+
+
+

app/src/main/java/ru/otus/daggerhomework/di/FragmentProducerModule.kt

@@ -0,0 +1,20 @@
+package ru.otus.daggerhomework.di
+
+import androidx.lifecycle.ViewModel
+import dagger.Binds
+import dagger.Module
+import dagger.multibindings.IntoMap
+import ru.otus.daggerhomework.ColorGenerator
+import ru.otus.daggerhomework.ColorGeneratorImpl
+import ru.otus.daggerhomework.ViewModelProducer
+
+@Module
+interface FragmentProducerModule {
+  @Binds
+  @IntoMap
+  @ViewModelKey(ViewModelProducer::class)
+  fun bindViewModelProducer(viewModelProducer: ViewModelProducer): ViewModel
+
+  @Binds
+  fun bindColorGenerator(colorGenerator: ColorGeneratorImpl): ColorGenerator
+}

app/src/main/java/ru/otus/daggerhomework/di/FragmentReceiverComponent.kt

@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Component
+import ru.otus.daggerhomework.FragmentReceiver
+
+@FragmentScope
+@Component(dependencies = [MainActivityComponent::class], modules = [FragmentReceiverModule::class])
+interface FragmentReceiverComponent {
+  fun inject(receiver: FragmentReceiver)
+}

app/src/main/java/ru/otus/daggerhomework/di/FragmentReceiverModule.kt

@@ -0,0 +1,15 @@
+package ru.otus.daggerhomework.di
+
+import androidx.lifecycle.ViewModel
+import dagger.Binds
+import dagger.Module
+import dagger.multibindings.IntoMap
+import ru.otus.daggerhomework.ViewModelReceiver
+
+@Module
+interface FragmentReceiverModule {
+  @Binds
+  @IntoMap
+  @ViewModelKey(ViewModelReceiver::class)
+  fun bindViewModelReceiver(viewModelReceiver: ViewModelReceiver): ViewModel
+}