Homework Dagger2

app/build.gradle

@@ -5,13 +5,13 @@ plugins {
 }
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 33
     buildToolsVersion "30.0.3"
 
     defaultConfig {
         applicationId "ru.otus.daggerhomework"
         minSdkVersion 23
-        targetSdkVersion 30
+        targetSdkVersion 33
         versionCode 1
         versionName "1.0"
 
@@ -30,15 +30,21 @@ android {
     }
     kotlinOptions {
         jvmTarget = '1.8'
+        freeCompilerArgs += [
+                "-Xjvm-default=all",
+        ]
     }
 }
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    implementation 'androidx.core:core-ktx:1.6.0'
-    implementation 'androidx.appcompat:appcompat:1.3.1'
-    implementation 'com.google.android.material:material:1.4.0'
-    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 'androidx.core:core-ktx:1.9.0'
+    implementation 'androidx.appcompat:appcompat:1.5.1'
+    implementation 'com.google.android.material:material:1.6.1'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'com.google.dagger:dagger:2.43.2'
+    kapt 'com.google.dagger:dagger-compiler:2.43.2'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.1'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.5.1'
+    implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
 }

app/src/main/AndroidManifest.xml

@@ -9,6 +9,7 @@
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
+        android:name=".App"
         android:theme="@style/Theme.DaggerHomework">
         <activity android:name=".MainActivity">
             <intent-filter>

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

@@ -2,5 +2,12 @@ package ru.otus.daggerhomework
 
 import android.app.Application
 
-class App :Application() {
+class App : Application() {
+
+    lateinit var appComponent: ApplicationComponent
+
+    override fun onCreate() {
+        super.onCreate()
+        appComponent = DaggerApplicationComponent.factory().create(this)
+    }
 }

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

@@ -1,4 +1,31 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import javax.inject.Qualifier
+import javax.inject.Scope
+import javax.inject.Singleton
+
+@Qualifier
+annotation class QualifierAppContext
+
+@Scope
+annotation class FragmentScope
+
+@Singleton
+@Component
 interface ApplicationComponent {
+
+    @QualifierAppContext
+    fun provideAppContext(): Context
+
+    @Component.Factory
+    interface AppComponentFactory {
+        fun create(
+            @QualifierAppContext
+            @BindsInstance
+            applicationContext: Context
+        ): ApplicationComponent
+    }
 }

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/FragmentProducer.kt

@@ -6,21 +6,37 @@ 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 viewModelProducer: ViewModelProducer
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        DaggerFragmentProducerComponent.builder()
+            .mainActivityComponent((requireActivity() as MainActivity).activityComponent)
+            .build()
+            .inject(this)
+        viewModelProducer = ViewModelProvider(this, viewModelFactory)[ViewModelProducer::class.java]
+    }
+
     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)
         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 +1,10 @@
+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 +1,18 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModel
+import dagger.Binds
+import dagger.Module
+import dagger.multibindings.IntoMap
+
+@Module
+interface FragmentProducerModule {
+
+    @Binds
+    @IntoMap
+    @ViewModelKey(ViewModelProducer::class)
+    fun viewModelProducer(viewModel: ViewModelProducer): ViewModel
+
+    @Binds
+    fun colorGeneratorBinds(generator: ColorGeneratorImpl): ColorGenerator
+}

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

@@ -4,28 +4,42 @@ 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: ViewModelFactory
+    lateinit var viewModelReceiver: ViewModelReceiver
     private lateinit var frame: View
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        DaggerFragmentReceiverComponent.builder()
+            .mainActivityComponent((requireActivity() as MainActivity).activityComponent)
+            .build()
+            .inject(this)
+        viewModelReceiver = ViewModelProvider(this, viewModelFactory)[ViewModelReceiver::class.java]
+    }
+
     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)
+        viewModelReceiver.observeColors { 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 +1,10 @@
+package ru.otus.daggerhomework
+
+import dagger.Component
+
+@FragmentScope
+@Component(dependencies = [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 viewModelReceiver(viewModel: ViewModelReceiver): ViewModel
+}

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

@@ -4,8 +4,23 @@ import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
 
 class MainActivity : AppCompatActivity() {
+
+    lateinit var activityComponent: MainActivityComponent
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        activityComponent = DaggerMainActivityComponent
+            .factory()
+            .create(this, (application as App).appComponent)
+            .also { activityComponent = it }
+
         setContentView(R.layout.activity_main)
+
+        supportFragmentManager
+            .beginTransaction()
+            .add(R.id.container_view, FragmentReceiver())
+            .add(R.id.container_view, FragmentProducer())
+            .commit()
     }
 }

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

@@ -0,0 +1,30 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import kotlinx.coroutines.flow.MutableStateFlow
+import javax.inject.Scope
+
+@Scope
+annotation class ActivityScope
+
+@ActivityScope
+@Component(dependencies = [ApplicationComponent::class], modules = [MainActivityModule::class])
+interface MainActivityComponent {
+
+    @QualifierAppContext
+    fun appContextProvide(): Context
+
+    fun activityContextProvide(): Context
+
+    fun stateFlowProvide(): MutableStateFlow<Int>
+
+    @Component.Factory
+    interface MainActivityComponentFactory {
+        fun create(
+            @BindsInstance activityContext: Context,
+            applicationComponent: ApplicationComponent
+        ): MainActivityComponent
+    }
+}

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

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

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

@@ -0,0 +1,20 @@
+package ru.otus.daggerhomework
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import dagger.MapKey
+import javax.inject.Inject
+import javax.inject.Provider
+import kotlin.reflect.KClass
+
+@MapKey
+annotation class ViewModelKey(val value: KClass<out ViewModel>)
+
+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 kotlinx.coroutines.flow.MutableStateFlow
 import java.lang.RuntimeException
+import javax.inject.Inject
 
-class ViewModelProducer(
+class ViewModelProducer @Inject constructor(
+    private val stateFlow: MutableStateFlow<Int>,
     private val colorGenerator: ColorGenerator,
     private val context: Context
 ) : ViewModel() {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
+        stateFlow.value = colorGenerator.generateColor()
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
     }
 }