Dagger2Homework

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"
 
@@ -41,4 +41,11 @@ dependencies {
     implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
     implementation 'com.google.dagger:dagger:2.38.1'
     kapt 'com.google.dagger:dagger-compiler:2.38.1'
+
+    implementation 'io.reactivex.rxjava2:rxjava:2.2.21'
+    implementation 'io.reactivex.rxjava2:rxandroid:2.1.1'
+    implementation "io.reactivex.rxjava2:rxkotlin:2.4.0"
+
+    implementation "androidx.activity:activity-ktx:1.4.0"
+    implementation 'androidx.fragment:fragment-ktx:1.4.0'
 }

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

@@ -3,4 +3,8 @@ package ru.otus.daggerhomework
 import android.app.Application
 
 class App :Application() {
+
+    val appComponent: ApplicationComponent by lazy {
+        DaggerApplicationComponent.factory().create(this)
+    }
 }

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

@@ -1,4 +1,49 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
+import androidx.lifecycle.ViewModel
+import dagger.BindsInstance
+import dagger.Component
+import dagger.MapKey
+import javax.inject.Qualifier
+import javax.inject.Scope
+import javax.inject.Singleton
+import kotlin.reflect.KClass
+
+@Singleton
+@Component
 interface ApplicationComponent {
-}
+
+    @Component.Factory
+    interface Factory {
+        fun create(@BindsInstance @ApplicationContext context: Context): ApplicationComponent
+    }
+
+    @ApplicationContext
+    fun provideApplicationContext(): Context
+}
+
+@Target(
+    AnnotationTarget.FUNCTION,
+    AnnotationTarget.PROPERTY_GETTER,
+    AnnotationTarget.PROPERTY_SETTER
+)
+@kotlin.annotation.Retention(AnnotationRetention.RUNTIME)
+@MapKey
+internal annotation class ViewModelKey(val value: KClass<out ViewModel>)
+
+@Scope
+@Retention(AnnotationRetention.RUNTIME)
+annotation class ActivityScoped
+
+@Scope
+@Retention(AnnotationRetention.RUNTIME)
+annotation class FragmentScoped
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class ApplicationContext
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class ActivityContext

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 java.util.Random
+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 +6,35 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+import javax.inject.Inject
 
 class FragmentProducer : Fragment() {
 
+    @Inject
+    lateinit var viewModelFactory: ViewModelFactory
+
     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)
+
+        DaggerFragmentProducerComponent.factory().create(
+            mainActivityComponent = (activity as MainActivity).mainActivityComponent
+        )
+            .inject(this)
+
+        val viewModelProducer: ViewModelProducer by viewModels { viewModelFactory }
+
         view.findViewById<Button>(R.id.button).setOnClickListener {
             //отправить результат через livedata в другой фрагмент
+            viewModelProducer.generateColor()
         }
     }
 }

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

@@ -0,0 +1,34 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModel
+import dagger.Binds
+import dagger.Component
+import dagger.Module
+import dagger.multibindings.IntoMap
+
+@FragmentScoped
+@Component(dependencies = [MainActivityComponent::class], modules = [ProducerModule::class])
+interface FragmentProducerComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun create(
+            mainActivityComponent: MainActivityComponent
+        ): FragmentProducerComponent
+    }
+
+    fun inject(fragment: FragmentProducer)
+}
+
+@Module
+interface ProducerModule {
+    @Binds
+    @FragmentScoped
+    fun bindColorGenerator(generator: ColorGeneratorImpl): ColorGenerator
+
+    @Binds
+    @IntoMap
+    @ViewModelKey(ViewModelProducer::class)
+    abstract fun viewModelProducer(viewModel: ViewModelProducer): ViewModel
+}
+

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

@@ -4,28 +4,44 @@ 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.fragment.app.viewModels
+import javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
 
     private lateinit var frame: View
 
+    @Inject
+    lateinit var viewModelFactory: ViewModelFactory
+
     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)
+
+        DaggerFragmentReceiverComponent.factory().create(
+            applicationComponent = (requireActivity().application as App).appComponent,
+            mainActivityComponent = (activity as MainActivity).mainActivityComponent
+        )
+            .inject(this)
+        val viewModelReceiver: ViewModelReceiver by viewModels { viewModelFactory }
+
+        viewModelReceiver.observeColors()
+        viewModelReceiver.color.observe(viewLifecycleOwner) {
+            populateColor(it)
+        }
     }
 
-    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 +1,35 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModel
+import dagger.Binds
+import dagger.Component
+import dagger.Module
+import dagger.multibindings.IntoMap
+
+@FragmentScoped
+@Component(
+    dependencies = [MainActivityComponent::class, ApplicationComponent::class],
+    modules = [ReceiverModule::class]
+)
+interface FragmentReceiverComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun create(
+            applicationComponent: ApplicationComponent,
+            mainActivityComponent: MainActivityComponent
+        ): FragmentReceiverComponent
+    }
+
+    fun inject(fragment: FragmentReceiver)
+}
+
+@Module
+interface ReceiverModule {
+
+    @Binds
+    @IntoMap
+    @ViewModelKey(ViewModelReceiver::class)
+    abstract fun viewModelReceiver(viewModel: 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
+import io.reactivex.subjects.PublishSubject
 
 class MainActivity : AppCompatActivity() {
+
+    val mainActivityComponent: MainActivityComponent by lazy {
+        DaggerMainActivityComponent.factory().create(
+            applicationComponent = (application as App).appComponent,
+            context = this,
+            observer = PublishSubject.create()
+        )
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
     }
-}
+}
+

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

@@ -0,0 +1,29 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import io.reactivex.subjects.PublishSubject
+
+@ActivityScoped
+@Component(dependencies = [ApplicationComponent::class])
+interface MainActivityComponent {
+    @Component.Factory
+    interface Factory {
+        fun create(
+            applicationComponent: ApplicationComponent,
+            @BindsInstance @ActivityContext context: Context,
+            @BindsInstance observer: PublishSubject<Int>
+        ): MainActivityComponent
+    }
+
+    fun inject(activity: MainActivity)
+
+    fun provideObserver(): PublishSubject<Int>
+
+    @ActivityContext
+    fun provideActivityContext(): Context
+}
+
+
+

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

@@ -0,0 +1,15 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import javax.inject.Inject
+import javax.inject.Provider
+
+@FragmentScoped
+class ViewModelFactory @Inject constructor(
+    private val viewModels: MutableMap<Class<out ViewModel>,
+        @JvmSuppressWildcards Provider<ViewModel>>
+) : ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T =
+        viewModels[modelClass]?.get() as T
+}

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

@@ -1,19 +1,22 @@
 package ru.otus.daggerhomework
 
-import android.app.Activity
 import android.content.Context
 import android.widget.Toast
 import androidx.fragment.app.FragmentActivity
 import androidx.lifecycle.ViewModel
-import java.lang.RuntimeException
+import io.reactivex.subjects.PublishSubject
+import javax.inject.Inject
 
-class ViewModelProducer(
+class ViewModelProducer @Inject constructor(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
+    @ActivityContext
+    private val context: Context,
+    private val observer: PublishSubject<Int>
 ) : ViewModel() {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        observer.onNext(colorGenerator.generateColor())
     }
 }