HW-dagger

app/src/main/AndroidManifest.xml

@@ -9,8 +9,10 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/Theme.DaggerHomework">
-        <activity android:name=".MainActivity"
+        android:theme="@style/Theme.DaggerHomework"
+        android:name=".App">
+        <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

@@ -1,5 +1,12 @@
 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: ApplicationComponent = DaggerApplicationComponent.factory().build(this)
+}
+
+val Application.component: ApplicationComponent get() = (this as App).component

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

@@ -0,0 +1,30 @@
+package ru.otus.daggerhomework
+
+import androidx.annotation.ColorInt
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.asSharedFlow
+
+interface ColorObserver {
+
+    val colorFlow: Flow<Int>
+
+    fun fireColorEvent(@ColorInt color: Int)
+
+}
+
+class ColorObserverImpl : ColorObserver {
+
+    private val _colorFlow = MutableSharedFlow<Int>(
+        extraBufferCapacity = 1,
+        replay = 1
+    )
+
+    override val colorFlow: Flow<Int>
+        get() = _colorFlow.asSharedFlow()
+
+    override fun fireColorEvent(color: Int) {
+        _colorFlow.tryEmit(color)
+    }
+
+}

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

@@ -1,11 +1,25 @@
 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(), MainActivityComponentProvider {
+    private lateinit var component: MainActivityComponent
 
-class MainActivity : ComponentActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
         setContentView(R.layout.activity_main)
+
+        component = DaggerMainActivityComponent.factory().build(application.component)
+
     }
+
+    override fun provideMainActivityComponent(): MainActivityComponent = component
+}
+
+interface MainActivityComponentProvider {
+    fun provideMainActivityComponent(): MainActivityComponent
 }

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

@@ -6,21 +6,34 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import ru.otus.daggerhomework.di.DaggerProducerFragmentComponent
+import ru.otus.daggerhomework.di.ProducerFragmentComponent
 
 class ProducerFragment : Fragment() {
 
+    private lateinit var producerFragmentComponent: ProducerFragmentComponent
+
+    private lateinit var viewModel: ProducerViewModel
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_producer, container, true)
+        producerFragmentComponent = DaggerProducerFragmentComponent.factory()
+            .build(
+                contextActivity = requireActivity(),
+                appComponent = (requireActivity() as MainActivity).application.component,
+                mainActivityComponent = (requireActivity() as MainActivityComponentProvider).provideMainActivityComponent()
+            )
+        viewModel = producerFragmentComponent.producerVM()
+        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 javax.inject.Inject
 
-class ProducerViewModel(
+class ProducerViewModel @Inject constructor(
     private val colorGenerator: ColorGenerator,
+    private val colorObserver: ColorObserver,
     private val context: Context
 ) {
 
     fun generateColor() {
         if (context !is Activity) throw RuntimeException("Activity context is required")
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        colorObserver.fireColorEvent(colorGenerator.generateColor())
     }
 }

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

@@ -6,25 +6,57 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.annotation.ColorInt
 import androidx.fragment.app.Fragment
+import ru.otus.daggerhomework.di.DaggerReceiverFragmentComponent
+import ru.otus.daggerhomework.di.ReceiverFragmentComponent
 
 class ReceiverFragment : Fragment() {
 
     private lateinit var frame: View
+    private lateinit var receiverFragmentComponent: ReceiverFragmentComponent
+    private lateinit var receiverViewModel: ReceiverViewModel
+    private var newBackgroundColor: Int? = null
 
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_receiver, container, true)
+        receiverFragmentComponent = DaggerReceiverFragmentComponent.factory()
+            .build(
+                appComponent = (requireActivity() as MainActivity).application.component,
+                mainActivityComponent = (requireActivity() as MainActivityComponentProvider).provideMainActivityComponent(),
+                contextActivity = (requireActivity() as MainActivity).application,
+                fragment = this,
+            )
+        receiverViewModel = receiverFragmentComponent.producerVM()
+        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)
+        receiverViewModel.observeColors(this)
     }
 
     fun populateColor(@ColorInt color: Int) {
         frame.setBackgroundColor(color)
+        newBackgroundColor = color
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        newBackgroundColor?.let {
+            outState.putInt(BUNDLE_KEY_NEW_BACKGROUND_COLOR, it)
+        }
+    }
+
+    override fun onViewStateRestored(savedInstanceState: Bundle?) {
+        super.onViewStateRestored(savedInstanceState)
+        savedInstanceState?.getInt(BUNDLE_KEY_NEW_BACKGROUND_COLOR)?.let {
+            populateColor(it)
+        }
+    }
+
+    companion object {
+        private const val BUNDLE_KEY_NEW_BACKGROUND_COLOR = "BUNDLE_KEY_NEW_BACKGROUND_COLOR"
     }
 }

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

@@ -3,13 +3,24 @@ package ru.otus.daggerhomework
 import android.app.Application
 import android.content.Context
 import android.widget.Toast
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.lifecycleScope
+import kotlinx.coroutines.launch
+import javax.inject.Inject
 
-class ReceiverViewModel(
-    private val context: Context
+class ReceiverViewModel @Inject constructor(
+    private val colorObserver: ColorObserver,
+    private val context: Context,
+    private val receiverFragment: ReceiverFragment,
 ) {
 
-    fun observeColors() {
+    fun observeColors(lifecycleOwner: LifecycleOwner) {
         if (context !is Application) throw RuntimeException("Application context is required")
-        Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+        lifecycleOwner.lifecycleScope.launch {
+            colorObserver.colorFlow.collect {
+                Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+                receiverFragment.populateColor(it)
+            }
+        }
     }
 }

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 +1,16 @@
+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 context: Context): ApplicationComponent
+    }
+}

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

@@ -0,0 +1,14 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Module
+import dagger.Provides
+import ru.otus.daggerhomework.ColorObserver
+import ru.otus.daggerhomework.ColorObserverImpl
+
+@Module
+class ColorGeneratorFeatureModule {
+
+    @Provides
+    @ActivityScope
+    fun colorObserver(): ColorObserver = ColorObserverImpl()
+}

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 +1,20 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Component
+import ru.otus.daggerhomework.ColorObserver
+
+
+@ActivityScope
+@Component(
+    modules = [ColorGeneratorFeatureModule::class],
+    dependencies = [ApplicationComponent::class]
+)
+interface MainActivityComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun build(appComponent: ApplicationComponent): MainActivityComponent
+    }
+
+    fun colorObserver(): ColorObserver
+}

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

@@ -0,0 +1,29 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import ru.otus.daggerhomework.ColorGenerator
+import ru.otus.daggerhomework.ProducerViewModel
+
+@FragmentScope
+@Component(
+    modules = [ProducerFragmentModule::class],
+    dependencies = [MainActivityComponent::class, ApplicationComponent::class]
+)
+interface ProducerFragmentComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun build(
+            @BindsInstance
+            contextActivity: Context,
+            appComponent: ApplicationComponent,
+            mainActivityComponent: MainActivityComponent,
+        ): ProducerFragmentComponent
+    }
+
+    fun colorGenerator(): ColorGenerator
+
+    fun producerVM(): ProducerViewModel
+}

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

@@ -0,0 +1,14 @@
+package ru.otus.daggerhomework.di
+
+import dagger.Module
+import dagger.Provides
+import ru.otus.daggerhomework.ColorGenerator
+import ru.otus.daggerhomework.ColorGeneratorImpl
+
+@Module
+class ProducerFragmentModule {
+
+    @Provides
+    @FragmentScope
+    fun colorGenerator(): ColorGenerator = ColorGeneratorImpl()
+}

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

@@ -0,0 +1,28 @@
+package ru.otus.daggerhomework.di
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import ru.otus.daggerhomework.ReceiverFragment
+import ru.otus.daggerhomework.ReceiverViewModel
+
+@FragmentScope
+@Component(
+    dependencies = [MainActivityComponent::class, ApplicationComponent::class]
+)
+interface ReceiverFragmentComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun build(
+            @BindsInstance
+            contextActivity: Context,
+            @BindsInstance
+            fragment: ReceiverFragment,
+            appComponent: ApplicationComponent,
+            mainActivityComponent: MainActivityComponent,
+        ): ReceiverFragmentComponent
+    }
+
+    fun producerVM(): ReceiverViewModel
+}