Dagger Homework

app/build.gradle

@@ -40,5 +40,11 @@ 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.navigation:navigation-fragment-ktx:2.2.0'
+    implementation 'androidx.navigation:navigation-ui-ktx:2.2.0'
     kapt 'com.google.dagger:dagger-compiler:2.38.1'
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.1"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.1"
+    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.2.0'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.2.0'
 }

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

@@ -1,6 +1,19 @@
 package ru.otus.daggerhomework
 
 import android.app.Application
+import android.content.Context
 
-class App :Application() {
-}
+class App: Application() {
+    lateinit var applicationComponent: ApplicationComponent
+
+    override fun onCreate() {
+        super.onCreate()
+        applicationComponent = DaggerApplicationComponent.factory().create(applicationContext)
+    }
+}
+
+val Context.applicationComponent: ApplicationComponent
+    get() = when (this)  {
+        is App -> applicationComponent
+        else -> this.applicationContext.applicationComponent
+    }

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

@@ -1,4 +1,44 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import dagger.Module
+import dagger.Provides
+import kotlinx.coroutines.flow.MutableStateFlow
+import javax.inject.Qualifier
+import javax.inject.Scope
+import javax.inject.Singleton
+
+@AppScope
+@Component(modules = [ApplicationModule::class])
 interface ApplicationComponent {
-}
+
+    @AppContext
+    fun provideContext(): Context
+
+    fun providesStateFlow(): MutableStateFlow<Int>
+
+    @Component.Factory
+    interface Factory {
+        fun create(
+            @AppContext
+            @BindsInstance context: Context
+        ): ApplicationComponent
+    }
+}
+
+@Module()
+class ApplicationModule {
+    @AppScope
+    @Provides
+    fun provideMutableStateFlow(): MutableStateFlow<Int> {
+        return MutableStateFlow(0)
+    }
+}
+
+@Qualifier
+annotation class AppContext
+
+@Scope
+annotation class AppScope

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/FragmentProducer.kt

@@ -6,21 +6,61 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import androidx.fragment.app.viewModels
+import dagger.Binds
+import dagger.Component
+import dagger.Module
+import javax.inject.Inject
+import javax.inject.Scope
 
 class FragmentProducer : Fragment() {
 
+    @Inject
+    lateinit var viewModelProducerFactory: ViewModelProducerFactory
+    private val viewModelProducer by viewModels<ViewModelProducer> { viewModelProducerFactory }
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_a, container, true)
+        DaggerFragmentProducerComponent
+            .factory()
+            .create((requireActivity() as MainActivity).mainActivityComponent)
+            .inject(this)
+        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()
         }
     }
-}
+}
+
+@FragmentScope
+@Component(
+    dependencies = [MainActivityComponent::class],
+    modules = [FragmentProducerModule::class]
+)
+interface FragmentProducerComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun create(mainActivityComponent: MainActivityComponent): FragmentProducerComponent
+    }
+    fun provideColorGenerator(): ColorGenerator
+    fun inject(fragment: FragmentProducer)
+}
+
+@Module
+interface FragmentProducerModule {
+    @FragmentScope
+    @Binds
+    fun colorGenerator(colorGeneratorImpl: ColorGeneratorImpl): ColorGenerator
+}
+
+@Scope
+annotation class FragmentScope

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

@@ -1,31 +1,63 @@
 package ru.otus.daggerhomework
 
 import android.os.Bundle
+import android.util.Log
 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 androidx.lifecycle.lifecycleScope
+import dagger.Component
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
+import javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
 
     private lateinit var frame: View
 
+    @Inject
+    lateinit var viewModelReceiverFactory: ViewModelReceiverFactory
+    private val viewModelReceiver by viewModels<ViewModelReceiver> { viewModelReceiverFactory }
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
         savedInstanceState: Bundle?
     ): View? {
-        return inflater.inflate(R.layout.fragment_b, container, true)
+        DaggerFragmentReceiverComponent
+            .factory()
+            .create((requireActivity() as MainActivity).mainActivityComponent)
+            .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)
+        lifecycleScope.launch {
+            viewModelReceiver.color.collectLatest { populateColor(it) }
+        }
     }
 
-    fun populateColor(@ColorInt color: Int) {
+    private fun populateColor(@ColorInt color: Int) {
+        Log.d("COLOR_VALUE", color.toString())
         frame.setBackgroundColor(color)
     }
+}
+
+@FragmentScope
+@Component(dependencies = [MainActivityComponent::class])
+interface FragmentReceiverComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun create(
+            appComponent: MainActivityComponent
+        ): FragmentReceiverComponent
+    }
+
+    fun inject(fragment: FragmentReceiver)
 }

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

@@ -1,11 +1,48 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import dagger.BindsInstance
+import dagger.Component
+import kotlinx.coroutines.flow.MutableStateFlow
+import javax.inject.Qualifier
+import javax.inject.Scope
 
 class MainActivity : AppCompatActivity() {
+    lateinit var mainActivityComponent: MainActivityComponent
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+        mainActivityComponent = DaggerMainActivityComponent.factory().create(this, applicationComponent)
         setContentView(R.layout.activity_main)
     }
-}
+}
+
+@ActivityScope
+@Component(
+    dependencies = [ApplicationComponent::class],
+)
+interface MainActivityComponent {
+
+    @AppContext
+    fun providesAppContext(): Context
+    @ActivityContext
+    fun provideActivityContext(): Context
+    fun providesStateFlow(): MutableStateFlow<Int>
+
+    @Component.Factory
+    interface Factory {
+        fun create(
+            @BindsInstance @ActivityContext context: Context,
+                   applicationComponent: ApplicationComponent
+        ): MainActivityComponent
+    }
+}
+
+@Scope
+annotation class ActivityScope
+
+@Qualifier
+annotation class ActivityContext
+

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

@@ -1,19 +1,38 @@
 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 androidx.lifecycle.ViewModelProvider
+import androidx.lifecycle.viewModelScope
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.launch
 import java.lang.RuntimeException
+import javax.inject.Inject
 
 class ViewModelProducer(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
+    @ActivityContext private val context: Context,
+    private val eventFlow: MutableStateFlow<Int>
 ) : ViewModel() {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
-        Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        viewModelScope.launch {
+            val color = colorGenerator.generateColor()
+            eventFlow.value = color
+            Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        }
+    }
+}
+
+class ViewModelProducerFactory @Inject constructor(
+    private val colorGenerator: ColorGenerator,
+    @ActivityContext private val context: Context,
+    private val eventFlow: MutableStateFlow<Int>
+) : ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        return ViewModelProducer(colorGenerator, context, eventFlow) as T
     }
 }

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

@@ -2,17 +2,38 @@ package ru.otus.daggerhomework
 
 import android.app.Application
 import android.content.Context
-import android.widget.Toast
-import androidx.fragment.app.FragmentActivity
-import androidx.lifecycle.ViewModel
+import androidx.lifecycle.*
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.collectLatest
+import kotlinx.coroutines.launch
 import java.lang.RuntimeException
+import javax.inject.Inject
 
 class ViewModelReceiver(
-    private val context: Context
+    @AppContext private val context: Context,
+    private val eventFlow: MutableStateFlow<Int>
 ) : ViewModel() {
+    private val _color = MutableStateFlow(0)
+    val color: StateFlow<Int> = _color
+
+    init {
+        observeColors()
+    }
 
     fun observeColors() {
         if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
-        Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+        viewModelScope.launch {
+            eventFlow.collectLatest { _color.value = it }
+        }
+    }
+}
+
+class ViewModelReceiverFactory @Inject constructor(
+    @AppContext private val context: Context,
+    private val eventFlow: MutableStateFlow<Int>
+) : ViewModelProvider.Factory {
+    override fun <T : ViewModel> create(modelClass: Class<T>): T {
+        return ViewModelReceiver(context, eventFlow) as T
     }
 }