Dagger 2. Домашняя работа Ковалев

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"
 
@@ -40,5 +40,8 @@ dependencies {
     implementation 'com.google.android.material:material:1.4.0'
     implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
     implementation 'com.google.dagger:dagger:2.38.1'
+    implementation 'androidx.fragment:fragment-ktx:1.4.1'
+    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.4.1'
     kapt 'com.google.dagger:dagger-compiler:2.38.1'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.1'
 }

app/src/main/AndroidManifest.xml

@@ -3,14 +3,15 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     package="ru.otus.daggerhomework">
 
-    <application
+    <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 +2,13 @@ package ru.otus.daggerhomework
 
 import android.app.Application
 
-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/ApplicationComponent.kt

@@ -1,4 +1,22 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+
+@Component
 interface ApplicationComponent {
+
+    @ApplicationContextQualifier
+    fun provideApplicationContext(): Context
+
+    @Component.Factory
+    interface ApplicationComponentFactory {
+
+        fun create(
+            @ApplicationContextQualifier
+            @BindsInstance
+            applicationContext: Context
+        ): ApplicationComponent
+    }
 }

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

@@ -0,0 +1,4 @@
+package ru.otus.daggerhomework
+
+@JvmInline
+value class Color constructor(val color: Int)

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/DaggerAnnotations.kt

@@ -0,0 +1,36 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModel
+import dagger.MapKey
+import javax.inject.Qualifier
+import javax.inject.Scope
+import kotlin.reflect.KClass
+
+@Scope
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ApplicationScope
+
+@Scope
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityScope
+
+@Scope
+@Retention(AnnotationRetention.RUNTIME)
+annotation class FragmentScope
+
+@MapKey
+@Retention(AnnotationRetention.RUNTIME)
+@Target(
+    AnnotationTarget.FUNCTION,
+    AnnotationTarget.PROPERTY_GETTER,
+    AnnotationTarget.PROPERTY_SETTER
+)
+annotation class ViewModelKey(val value: KClass<out ViewModel>)
+
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityContextQualifier
+
+@Qualifier
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ApplicationContextQualifier

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

@@ -1,26 +1,48 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
 import android.os.Bundle
 import android.view.LayoutInflater
 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: ViewModelFactory
+
+    lateinit var vm: ViewModelProducer
+
     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 onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
+
+        vm = ViewModelProvider(this, viewModelFactory)[ViewModelProducer::class.java]
+
         view.findViewById<Button>(R.id.button).setOnClickListener {
+            vm.generateColor()
             //отправить результат через livedata в другой фрагмент
         }
     }
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        DaggerFragmentProducerComponent
+            .builder()
+            .mainActivityComponent((activity as MainActivity).component)
+            .build()
+            .inject(this)
+    }
 }

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

@@ -0,0 +1,10 @@
+package ru.otus.daggerhomework
+
+import dagger.Component
+
+@FragmentScope
+@Component(dependencies = [MainActivityComponent::class], modules = [FragmentProducerModule::class])
+interface FragmentProducerComponent {
+
+    fun inject(fragment: FragmentProducer)
+}

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

@@ -0,0 +1,19 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModel
+import dagger.Binds
+import dagger.Module
+import dagger.multibindings.IntoMap
+
+@Module
+interface FragmentProducerModule {
+
+    @Binds
+    @FragmentScope
+    fun bindsColorGenerator(impl: ColorGeneratorImpl): ColorGenerator
+
+    @Binds
+    @IntoMap
+    @ViewModelKey(ViewModelProducer::class)
+    fun bindsViewModelProducer(viewModelProducer: ViewModelProducer): ViewModel
+}

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

@@ -1,31 +1,64 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
 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.ViewModelProvider
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import kotlinx.coroutines.launch
+import javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
 
+    @Inject
+    lateinit var viewModelFactory: ViewModelFactory
+
+    lateinit var vm: ViewModelReceiver
+
     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 onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         frame = view.findViewById(R.id.frame)
+
+        vm = ViewModelProvider(this, viewModelFactory)[ViewModelReceiver::class.java]
+        vm.observeColors()
+
+        viewLifecycleOwner.lifecycleScope.launch {
+            viewLifecycleOwner.repeatOnLifecycle(Lifecycle.State.STARTED) {
+                vm.colorFlow.collect {
+                    populateColor(it.color)
+                }
+            }
+        }
+    }
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+
+        DaggerFragmentReceiverComponent
+            .builder()
+            .mainActivityComponent((activity as MainActivity).component)
+            .applicationComponent((activity?.application as App).applicationComponent)
+            .build()
+            .inject(this)
     }
 
-    fun populateColor(@ColorInt color: Int) {
+    private fun populateColor(@ColorInt color: Int) {
         frame.setBackgroundColor(color)
     }
 }

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

@@ -0,0 +1,9 @@
+package ru.otus.daggerhomework
+
+import dagger.Component
+
+@FragmentScope
+@Component(dependencies = [ApplicationComponent::class, MainActivityComponent::class], modules = [FragmentReceiverModule::class])
+interface FragmentReceiverComponent {
+    fun inject(fragment: FragmentReceiver)
+}

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

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

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

@@ -1,11 +1,22 @@
 package ru.otus.daggerhomework
 
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
 
 class MainActivity : AppCompatActivity() {
+
+    lateinit var component: MainActivityComponent
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        component = DaggerMainActivityComponent
+            .factory()
+            .create(
+                this,
+                (application as App).applicationComponent,
+            )
+
         setContentView(R.layout.activity_main)
     }
 }

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

@@ -0,0 +1,31 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+@ActivityScope
+@Component(
+    modules = [MainActivityModule::class],
+    dependencies = [ApplicationComponent::class]
+)
+interface MainActivityComponent {
+
+    @ActivityContextQualifier
+    fun provideActivityContext(): Context
+
+    fun provideColorStateFlow(): MutableStateFlow<Color>
+
+    @Component.Factory
+    interface MainActivityComponentFactory {
+
+        fun create(
+            @BindsInstance
+            @ActivityContextQualifier
+            activityContext: Context,
+            mainActivityComponent: ApplicationComponent
+        ): MainActivityComponent
+    }
+}

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

@@ -0,0 +1,14 @@
+package ru.otus.daggerhomework
+
+import dagger.Module
+import dagger.Provides
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+@Module
+class MainActivityModule {
+
+    @ActivityScope
+    @Provides
+    fun providesColorStateFlow(): MutableStateFlow<Color> = MutableStateFlow(Color(0))
+}