Уф. Готово Dagger 2

app/build.gradle

@@ -40,4 +40,6 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
     implementation 'com.google.dagger:dagger:2.42'
     kapt 'com.google.dagger:dagger-compiler:2.42'
+    implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1"
+    implementation "androidx.lifecycle:lifecycle-runtime-ktx:2.5.1"
 }

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:allowBackup="true"
+        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 +1,18 @@
 package ru.otus.daggerhomework
 
 import android.app.Application
+import ru.otus.daggerhomework.di.ApplicationComponent
+import ru.otus.daggerhomework.di.DaggerApplicationComponent
+
+
+class App : Application() {
+
+    lateinit var appComponent: ApplicationComponent
+        private set
+
+    override fun onCreate() {
+        super.onCreate()
+        appComponent = DaggerApplicationComponent.factory().create(this)
+    }
 
-class App :Application() {
 }

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

@@ -4,14 +4,15 @@ 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 +6,42 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import ru.otus.daggerhomework.di.DaggerFragmentProducerComponent
+import ru.otus.daggerhomework.di.FragmentProducerComponent
+import javax.inject.Inject
 
 class FragmentProducer : Fragment() {
 
+    @Inject
+    lateinit var viewModelFactory: ViewModelProducer.Factory
+
+    private val viewModelProducer by lazy {
+        ViewModelProvider(this, viewModelFactory)[ViewModelProducer::class.java]
+    }
+
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_a, container, true)
+        return inflater.inflate(R.layout.fragment_a, container, false)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val fragmentProducerComponent = DaggerFragmentProducerComponent.factory()
+            .create((requireActivity() as MainActivity).mainActivityComponent)
+        fragmentProducerComponent.inject(this)
     }
 
     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
-        }
+
+        view.findViewById<Button>(R.id.button)
+            .setOnClickListener {
+                viewModelProducer.generateColor()
+            }
     }
 }

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

@@ -4,25 +4,48 @@ 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.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.flow.launchIn
+import kotlinx.coroutines.flow.onEach
+import ru.otus.daggerhomework.di.DaggerFragmentReceiverComponent
+import ru.otus.daggerhomework.di.FragmentReceiverComponent
+import javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
 
+    @Inject
+    lateinit var viewModelFactory: ViewModelReceiver.Factory
+
+    private val viewModelReceiver by lazy {
+        ViewModelProvider(this, viewModelFactory)[ViewModelReceiver::class.java]
+    }
+
     private lateinit var frame: View
 
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_b, container, true)
+        return inflater.inflate(R.layout.fragment_b, container, false)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        val fragmentReceiverComponent = DaggerFragmentReceiverComponent.factory().create((requireActivity() as MainActivity).mainActivityComponent)
+        fragmentReceiverComponent.inject(this)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+
         frame = view.findViewById(R.id.frame)
+        viewModelReceiver.observeColors().onEach {
+            populateColor(it)
+        }.launchIn(lifecycleScope)
     }
 
     fun populateColor(@ColorInt color: Int) {

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

@@ -2,11 +2,23 @@ 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 mainActivityComponent: MainActivityComponent
+        private set
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+        mainActivityComponent = DaggerMainActivityComponent.factory().create(this, (application as App).appComponent)
+
+        supportFragmentManager
+            .beginTransaction()
+            .add(R.id.fragment_a, FragmentReceiver())
+            .add(R.id.fragment_b, FragmentProducer())
+            .commit()
     }
 }

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

@@ -3,14 +3,35 @@ package ru.otus.daggerhomework
 import android.content.Context
 import android.widget.Toast
 import androidx.fragment.app.FragmentActivity
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import javax.inject.Inject
 
 class ViewModelProducer(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
-) {
+    private val context: Context,
+    val stateFlow: MutableStateFlow<Int>
+) : ViewModel() {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
+        stateFlow.value = colorGenerator.generateColor()
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
     }
+
+
+    class Factory @Inject constructor(
+        private val colorGenerator: ColorGenerator,
+        private val context: Context,
+        private val stateFlow: MutableStateFlow<Int>
+    ) : ViewModelProvider.Factory {
+
+        override fun <T : ViewModel> create(modelClass: Class<T>): T {
+            if (modelClass.isAssignableFrom(ViewModelProducer::class.java))
+                return ViewModelProducer(colorGenerator, context, stateFlow) as T
+            else throw IllegalArgumentException()
+        }
+    }
 }

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

@@ -3,13 +3,33 @@ package ru.otus.daggerhomework
 import android.app.Application
 import android.content.Context
 import android.widget.Toast
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import kotlinx.coroutines.flow.StateFlow
+import ru.otus.daggerhomework.di.ApplicationContext
+import javax.inject.Inject
 
 class ViewModelReceiver(
-    private val context: Context
-) {
+    private val context: Context,
+    private val stateFlow: StateFlow<Int>
+): ViewModel() {
 
-    fun observeColors() {
+    fun observeColors() : StateFlow<Int>{
         if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
         Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+        return stateFlow
+    }
+
+    class Factory @Inject constructor(
+        @ApplicationContext val context: Context,
+        val stateFlow: StateFlow<Int>
+    ) : ViewModelProvider.Factory {
+        override fun <T : ViewModel> create(modelClass: Class<T>): T {
+            if (modelClass.isAssignableFrom(ViewModelReceiver::class.java)) {
+                return ViewModelReceiver(context, stateFlow) as T
+            } else {
+                throw IllegalArgumentException("Unknown ViewModel class")
+            }
+        }
     }
 }

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

@@ -0,0 +1,21 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import javax.inject.Qualifier
+import javax.inject.Singleton
+
+
+@Component
+@Singleton
+interface ApplicationComponent {
+
+    @ApplicationContext
+    fun provideContext(): Context
+
+    @Component.Factory
+    interface Factory {
+        fun create(@BindsInstance @ApplicationContext context: Context): ApplicationComponent
+    }
+}

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

@@ -0,0 +1,16 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Component
+import ru.otus.daggerhomework.FragmentProducer
+
+@Component(dependencies = [MainActivityComponent::class])
+@FragmentScope
+interface FragmentProducerComponent {
+
+    fun inject(fragmentProducer: FragmentProducer)
+
+    @Component.Factory
+    interface Factory {
+        fun create(mainActivityComponent: MainActivityComponent): FragmentProducerComponent
+    }
+}

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Module
+
+@Module
+object FragmentProducerModule {
+}

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

@@ -0,0 +1,18 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Component
+import ru.otus.daggerhomework.FragmentProducer
+import ru.otus.daggerhomework.FragmentReceiver
+
+@Component(dependencies = [MainActivityComponent::class])
+@FragmentScope
+interface FragmentReceiverComponent {
+
+    fun inject(fragmentReceiver: FragmentReceiver)
+
+    @Component.Factory
+    interface Factory {
+        fun create(mainActivityComponent: MainActivityComponent): FragmentReceiverComponent
+    }
+
+}

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Module
+
+@Module
+object FragmentReceiverModule {
+}

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

@@ -0,0 +1,28 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import ru.otus.daggerhomework.ColorGenerator
+import ru.otus.daggerhomework.MainActivity
+
+@Component(dependencies = [ApplicationComponent::class], modules = [MainModule::class])
+@ActivityScope
+interface MainActivityComponent {
+    fun provideContext():Context
+
+    fun provideColorGenerator(): ColorGenerator
+
+    fun provideMutableStateFlow(): MutableStateFlow<Int>
+    fun provideStateFlow(): StateFlow<Int>
+
+    @ApplicationContext
+    fun provideApplicationContext(): Context
+
+    @Component.Factory
+    interface Factory {
+        fun create(@BindsInstance context: Context, applicationComponent: ApplicationComponent): MainActivityComponent
+    }
+}