Решение ДЗ по Dagger 2

app/build.gradle

@@ -5,12 +5,12 @@ plugins {
 }
 
 android {
-    compileSdkVersion 31
+    compileSdkVersion 34
 
     defaultConfig {
         applicationId "ru.otus.daggerhomework"
         minSdkVersion 23
-        targetSdkVersion 31
+        targetSdkVersion 34
         versionCode 1
         versionName "1.0"
 

app/src/main/AndroidManifest.xml

@@ -4,13 +4,15 @@
     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=".MainActivity"
+            android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 

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

@@ -2,5 +2,20 @@ package ru.otus.daggerhomework
 
 import android.app.Application
 
-class App :Application() {
+class App : Application() {
+  override fun onCreate() {
+    super.onCreate()
+    initializeDI()
+  }
+
+  fun getApplicationComponent(): ApplicationComponent = appComponent
+
+  private fun initializeDI() {
+    appComponent = DaggerApplicationComponent.factory()
+      .create(this)
+  }
+
+  companion object {
+    private lateinit var appComponent: ApplicationComponent
+  }
 }

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

@@ -1,4 +1,25 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import javax.inject.Qualifier
+import javax.inject.Singleton
+
+@Qualifier
+annotation class ContextApplication
+
+@Singleton
+@Component()
 interface ApplicationComponent {
+
+  @Component.Factory
+  interface Factory {
+    fun create(
+      @BindsInstance @ContextApplication context: Context,
+    ): ApplicationComponent
+  }
+
+  @ContextApplication
+  fun provideApplicationContext(): Context
 }

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/ColorObservable.kt

@@ -0,0 +1,31 @@
+package ru.otus.daggerhomework
+
+import javax.inject.Inject
+
+interface IObserver<T> {
+  fun notify(data: T)
+}
+
+interface IColorObservable {
+  fun add(observer: IObserver<Int>)
+
+  fun remove(observer: IObserver<Int>)
+
+  fun notify(data: Int)
+}
+
+class ColorObservableImpl @Inject constructor() : IColorObservable {
+  private val observers = mutableListOf<IObserver<Int>>()
+
+  override fun add(observer: IObserver<Int>) {
+    observers.add(observer)
+  }
+
+  override fun remove(observer: IObserver<Int>) {
+    observers.remove(observer)
+  }
+
+  override fun notify(data: Int) {
+    observers.forEach { it.notify(data) }
+  }
+}

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

@@ -0,0 +1,6 @@
+package ru.otus.daggerhomework
+
+import javax.inject.Scope
+
+@Scope
+annotation class FeatureScope

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

@@ -6,21 +6,38 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import javax.inject.Inject
 
 class FragmentProducer : Fragment() {
+    @Inject
+    lateinit var viewModelFactory: ViewModelProvider.Factory
+
+    private lateinit var viewModelProducer: ViewModelProducer
 
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_a, container, true)
+        ProducerComponent
+            .getProducerComponent(
+                (requireActivity() as MainActivity).getMainActivityComponent(),
+            )
+            .inject(this)
+
+        return inflater.inflate(R.layout.fragment_a, container, false)
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+
+        viewModelProducer = ViewModelProvider(this, viewModelFactory)
+            .get(ViewModelProducer::class.java)
+
         view.findViewById<Button>(R.id.button).setOnClickListener {
             //отправить результат через livedata в другой фрагмент
+            viewModelProducer.generateColor()
         }
     }
 }

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

@@ -4,11 +4,17 @@ 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 javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
+    @Inject
+    lateinit var viewModelFactory: ViewModelProvider.Factory
+
+
+    private lateinit var viewModelReceiver: ViewModelReceiver
 
     private lateinit var frame: View
 
@@ -17,12 +23,25 @@ class FragmentReceiver : Fragment() {
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_b, container, true)
+        ReceiverComponent
+            .getReceiverComponent(
+                (requireActivity() as MainActivity).getMainActivityComponent()
+            )
+            .inject(this)
+
+        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)
+        viewModelReceiver = ViewModelProvider(this, viewModelFactory)
+            .get(ViewModelReceiver::class.java)
+
+        viewModelReceiver.state.observe(viewLifecycleOwner) {
+            populateColor(it)
+        }
     }
 
     fun populateColor(@ColorInt color: Int) {

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

@@ -1,12 +1,35 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import javax.inject.Inject
 
 class MainActivity : AppCompatActivity() {
+    @Inject
+    @ContextApplication
+    lateinit var _applicationContext: Context
+
+    @Inject
+    @ContextActivity
+    lateinit var _activityContext: Context
+
+    private lateinit var mainActivityComponent: MainActivityComponent
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        mainActivityComponent = DaggerMainActivityComponent
+            .factory()
+            .create(
+                applicationComponent = (application as App)
+                    .getApplicationComponent(),
+                context = this,
+            )
+        mainActivityComponent.inject(this)
     }
+
+    fun getMainActivityComponent(): MainActivityComponent =
+        mainActivityComponent
 }

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

@@ -0,0 +1,48 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import dagger.Binds
+import dagger.BindsInstance
+import dagger.Component
+import dagger.Module
+import javax.inject.Qualifier
+import javax.inject.Scope
+
+@Scope
+annotation class ActivityScope
+
+@Qualifier
+annotation class ContextActivity
+
+@ActivityScope
+@Component(
+  modules = [MainActivityModule::class],
+  dependencies = [ApplicationComponent::class],
+)
+interface MainActivityComponent {
+
+  @Component.Factory
+  interface Factory {
+    fun create(
+      applicationComponent: ApplicationComponent,
+      @BindsInstance @ContextActivity context: Context,
+    ): MainActivityComponent
+  }
+
+  @ContextApplication
+  fun provideApplicationContext(): Context
+
+  @ContextActivity
+  fun provideActivityContext(): Context
+
+  fun provideObservable(): IColorObservable
+
+  fun inject(mainActivity: MainActivity)
+}
+
+@Module
+interface MainActivityModule {
+  @ActivityScope
+  @Binds
+  fun bindObservable(impl: ColorObservableImpl): IColorObservable
+}

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

@@ -0,0 +1,33 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModelProvider
+import dagger.Binds
+import dagger.Component
+import dagger.Module
+
+@FeatureScope
+@Component(
+  modules = [ProducerModule::class],
+  dependencies = [MainActivityComponent::class],
+)
+interface ProducerComponent {
+  companion object {
+    fun getProducerComponent(cmpt: MainActivityComponent): ProducerComponent {
+      return DaggerProducerComponent
+        .builder()
+        .mainActivityComponent(cmpt)
+        .build()
+    }
+  }
+
+  fun inject(fragmentProducer: FragmentProducer)
+}
+
+@Module
+interface ProducerModule {
+  @Binds
+  fun bindFactory(factory: ViewModelProducerFactory): ViewModelProvider.Factory
+
+  @Binds
+  fun bindColorGenerator(impl: ColorGeneratorImpl): ColorGenerator
+}

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

@@ -0,0 +1,30 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModelProvider
+import dagger.Binds
+import dagger.Component
+import dagger.Module
+
+@FeatureScope
+@Component(
+  modules = [ReceiverModule::class],
+  dependencies = [MainActivityComponent::class],
+)
+interface ReceiverComponent {
+  companion object {
+    fun getReceiverComponent(cmpt: MainActivityComponent): ReceiverComponent {
+      return DaggerReceiverComponent
+        .builder()
+        .mainActivityComponent(cmpt)
+        .build()
+    }
+  }
+
+  fun inject(fragmentReceiver: FragmentReceiver)
+}
+
+@Module
+interface ReceiverModule {
+  @Binds
+  fun bindFactory(factory: ViewModelReceiverFactory): ViewModelProvider.Factory
+}