ДЗ Dagger 2

app/src/main/AndroidManifest.xml

@@ -4,6 +4,7 @@
     package="ru.otus.daggerhomework">
 
     <application
+        android:name=".App"
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"

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

@@ -1,5 +1,11 @@
 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() {
+    val component = DaggerApplicationComponent.factory().build(this)
+}
+
+val Application.component: ApplicationComponent get() = (this as App).component

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

@@ -2,8 +2,7 @@ package ru.otus.daggerhomework
 
 import android.graphics.Color
 import androidx.annotation.ColorInt
-import androidx.annotation.ColorRes
-import java.util.*
+import java.util.Random
 
 interface ColorGenerator {
 

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework
+
+sealed class Event {
+    data class PopulateColor(
+        val color: Int
+    ) : Event()
+}

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

@@ -1,11 +1,19 @@
 package ru.otus.daggerhomework
 
 import android.os.Bundle
-import androidx.activity.ComponentActivity
+import androidx.fragment.app.FragmentActivity
+import ru.otus.daggerhomework.di.DaggerMainActivityComponent
+import ru.otus.daggerhomework.di.MainActivityComponent
+
+class MainActivity : FragmentActivity() {
+
+    lateinit var component: MainActivityComponent
 
-class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        component = DaggerMainActivityComponent.factory().build(this)
         setContentView(R.layout.activity_main)
     }
-}
+}
+
+val FragmentActivity.component: MainActivityComponent get() = (this as MainActivity).component

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

@@ -6,21 +6,31 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import ru.otus.daggerhomework.di.DaggerProducerFragmentComponent
+
 
 class ProducerFragment : Fragment() {
 
+    private lateinit var viewModel: ProducerViewModel
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_producer, container, true)
+
+        val component = DaggerProducerFragmentComponent
+            .factory()
+            .build(requireActivity().component)
+        viewModel = component.viewModel()
+
+        return inflater.inflate(R.layout.fragment_producer, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         view.findViewById<Button>(R.id.button).setOnClickListener {
-            //отправить результат через flow в другой фрагмент
+            viewModel.generateColor()
         }
     }
 }

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

@@ -3,14 +3,17 @@ package ru.otus.daggerhomework
 import android.app.Activity
 import android.content.Context
 import android.widget.Toast
+import kotlinx.coroutines.flow.MutableStateFlow
 
 class ProducerViewModel(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
+    private val context: Context,
+    private val event: MutableStateFlow<Event?>
 ) {
 
     fun generateColor() {
         if (context !is Activity) throw RuntimeException("Activity context is required")
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        event.value = Event.PopulateColor(color = colorGenerator.generateColor())
     }
 }

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

@@ -6,25 +6,50 @@ import android.view.View
 import android.view.ViewGroup
 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.DaggerReceiverFragmentComponent
 
 class ReceiverFragment : Fragment() {
 
     private lateinit var frame: View
 
+    private lateinit var viewModel: ReceiverViewModel
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_receiver, container, true)
+        val component = DaggerReceiverFragmentComponent
+            .factory()
+            .build(
+                requireActivity().application.component,
+                requireActivity().component
+            )
+        viewModel = component.viewModel()
+
+        return inflater.inflate(R.layout.fragment_receiver, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         frame = view.findViewById(R.id.frame)
+        lifecycleScope.launch {
+            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                viewModel.event.collect { event ->
+                    viewModel.observeColors()
+                    when (event) {
+                        is Event.PopulateColor -> populateColor(event.color)
+                    }
+                }
+            }
+        }
     }
 
-    fun populateColor(@ColorInt color: Int) {
+    private fun populateColor(@ColorInt color: Int) {
         frame.setBackgroundColor(color)
     }
 }

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

@@ -3,11 +3,16 @@ package ru.otus.daggerhomework
 import android.app.Application
 import android.content.Context
 import android.widget.Toast
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.mapNotNull
 
 class ReceiverViewModel(
-    private val context: Context
+    private val context: Context,
+    event: MutableStateFlow<Event?>
 ) {
 
+    val event = event.mapNotNull { it }
+
     fun observeColors() {
         if (context !is Application) throw RuntimeException("Application context is required")
         Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework.di
+
+import javax.inject.Qualifier
+
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityContext()

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework.di
+
+import javax.inject.Scope
+
+@Scope
+@Retention(value = AnnotationRetention.RUNTIME)
+annotation class ActivityScope()

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

@@ -0,0 +1,19 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import javax.inject.Singleton
+
+@Singleton
+@Component
+interface ApplicationComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun build(@BindsInstance @ApplicationContext context: Context): ApplicationComponent
+    }
+
+    @ApplicationContext
+    fun getContext(): Context
+}

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework.di
+
+import javax.inject.Qualifier
+
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ApplicationContext()

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework.di
+
+import javax.inject.Scope
+
+@Scope
+@Retention(value = AnnotationRetention.RUNTIME)
+annotation class FragmentScope()

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

@@ -0,0 +1,21 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import kotlinx.coroutines.flow.MutableStateFlow
+import ru.otus.daggerhomework.Event
+
+@ActivityScope
+@Component(modules = [MainActivityModule::class])
+interface MainActivityComponent {
+    @Component.Factory
+    interface Factory {
+        fun build(@BindsInstance @ActivityContext context: Context): MainActivityComponent
+    }
+
+    fun event(): MutableStateFlow<Event>
+
+    @ActivityContext
+    fun getContext(): Context
+}

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

@@ -0,0 +1,13 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Module
+import dagger.Provides
+import kotlinx.coroutines.flow.MutableStateFlow
+import ru.otus.daggerhomework.Event
+
+@Module
+class MainActivityModule {
+    @Provides
+    @ActivityScope
+    fun events(): MutableStateFlow<Event?> = MutableStateFlow(null)
+}

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

@@ -0,0 +1,22 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Component
+import ru.otus.daggerhomework.ProducerViewModel
+
+@Component(
+    dependencies = [MainActivityComponent::class],
+    modules = [ProducerModule::class]
+)
+@FragmentScope
+interface ProducerFragmentComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun build(
+            mainActivityComponent: MainActivityComponent
+        ): ProducerFragmentComponent
+    }
+
+    fun viewModel(): ProducerViewModel
+
+}

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

@@ -0,0 +1,28 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.Module
+import dagger.Provides
+import kotlinx.coroutines.flow.MutableStateFlow
+import ru.otus.daggerhomework.ColorGenerator
+import ru.otus.daggerhomework.ColorGeneratorImpl
+import ru.otus.daggerhomework.Event
+import ru.otus.daggerhomework.ProducerViewModel
+
+
+@Module
+class ProducerModule {
+
+    @Provides
+    @FragmentScope
+    fun colorGenerator(): ColorGenerator = ColorGeneratorImpl()
+
+    @Provides
+    @FragmentScope
+    fun viewModel(
+        colorGenerator: ColorGenerator,
+        @ActivityContext
+        context: Context,
+        event: MutableStateFlow<Event?>
+    ): ProducerViewModel = ProducerViewModel(colorGenerator, context, event)
+}

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

@@ -0,0 +1,22 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Component
+import ru.otus.daggerhomework.ReceiverViewModel
+
+@Component(
+    dependencies = [MainActivityComponent::class, ApplicationComponent::class],
+    modules = [ReceiverModule::class]
+)
+@FragmentScope
+interface ReceiverFragmentComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun build(
+            applicationComponent: ApplicationComponent,
+            mainActivityComponent: MainActivityComponent
+        ): ReceiverFragmentComponent
+    }
+
+    fun viewModel(): ReceiverViewModel
+}

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

@@ -0,0 +1,20 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.Module
+import dagger.Provides
+import kotlinx.coroutines.flow.MutableStateFlow
+import ru.otus.daggerhomework.Event
+import ru.otus.daggerhomework.ReceiverViewModel
+
+@Module
+class ReceiverModule {
+
+    @Provides
+    @FragmentScope
+    fun viewModel(
+        @ApplicationContext
+        context: Context,
+        event: MutableStateFlow<Event?>
+    ): ReceiverViewModel = ReceiverViewModel(context, event)
+}