[ДЗ | Dagger 2] - Егор Шкляревский

app/build.gradle

@@ -33,7 +33,10 @@ android {
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib:1.6.0"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.6.0"  // For coroutines
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.0"  // For Android
+    implementation 'androidx.lifecycle:lifecycle-runtime-ktx:2.2.0'
     implementation 'androidx.core:core-ktx:1.6.0'
     implementation 'androidx.appcompat:appcompat:1.3.1'
     implementation 'com.google.android.material:material:1.4.0'

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 +2,15 @@ package ru.otus.daggerhomework
 
 import android.app.Application
 
-class App :Application() {
+class App : Application() {
+
+    private lateinit var component: ApplicationComponent
+
+    override fun onCreate() {
+        super.onCreate()
+
+        component = DaggerApplicationComponent.factory().create(this)
+    }
+
+    fun getAppComponent(): ApplicationComponent = component
 }

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

@@ -1,4 +1,17 @@
 package ru.otus.daggerhomework
 
+import android.app.Application
+import dagger.BindsInstance
+import dagger.Component
+
+@Component
 interface ApplicationComponent {
+
+    fun provideApplication(): Application
+
+    @Component.Factory
+    interface Factory {
+
+        fun create(@BindsInstance application: Application): 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 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 +6,33 @@ import android.view.View
 import android.view.ViewGroup
 import android.widget.Button
 import androidx.fragment.app.Fragment
+import javax.inject.Inject
 
 class FragmentProducer : Fragment() {
 
+    @Inject
+    lateinit var viewModelProducer: 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)
+
+        DaggerFragmentProducerComponent
+            .builder()
+            .applicationComponent((requireActivity().application as App).getAppComponent())
+            .mainActivityComponent((requireActivity() as MainActivity).getComponent())
+            .build()
+            .inject(this)
+
         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 +1,23 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import dagger.*
+import kotlinx.coroutines.flow.MutableStateFlow
+
+@Component(
+    modules = [ViewModelProducerModule::class],
+    dependencies = [ApplicationComponent::class, MainActivityComponent::class]
+)
+interface FragmentProducerComponent {
+
+    fun inject(fragmentProducer: FragmentProducer)
+}
+
+@Module
+object ViewModelProducerModule {
+
+    @Provides
+    fun provide(colorGenerator: ColorGenerator, context: Context, flow: MutableStateFlow<Int>): ViewModelProducer {
+        return ViewModelProducer(colorGenerator, context, flow)
+    }
+}

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

@@ -1,28 +1,45 @@
 package ru.otus.daggerhomework
 
 import android.os.Bundle
-import android.view.LayoutInflater
-import android.view.View
-import android.view.ViewGroup
-import android.widget.Button
+import android.view.*
 import androidx.annotation.ColorInt
 import androidx.fragment.app.Fragment
+import androidx.lifecycle.*
+import kotlinx.coroutines.launch
+import javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
 
+    @Inject
+    lateinit var viewModelReceiver: 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)
+
+        DaggerFragmentReceiverComponent
+            .builder()
+            .applicationComponent((requireActivity().application as App).getAppComponent())
+            .mainActivityComponent((requireActivity() as MainActivity).getComponent())
+            .build()
+            .inject(this)
+
         frame = view.findViewById(R.id.frame)
+
+        lifecycleScope.launch {
+            viewModelReceiver.observeColors().collect { color ->
+                color.takeIf { it != -1 }?.let(::populateColor)
+            }
+        }
     }
 
     fun populateColor(@ColorInt color: Int) {

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

@@ -0,0 +1,23 @@
+package ru.otus.daggerhomework
+
+import android.app.Application
+import dagger.*
+import kotlinx.coroutines.flow.MutableStateFlow
+
+@Component(
+    modules = [ViewModelReceiverModule::class],
+    dependencies = [ApplicationComponent::class, MainActivityComponent::class]
+)
+interface FragmentReceiverComponent {
+
+    fun inject(fragmentReceiver: FragmentReceiver)
+}
+
+@Module
+object ViewModelReceiverModule {
+
+    @Provides
+    fun provide(context: Application, flow: MutableStateFlow<Int>): ViewModelReceiver {
+        return ViewModelReceiver(context, flow)
+    }
+}

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

@@ -2,11 +2,22 @@ package ru.otus.daggerhomework
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import kotlinx.coroutines.flow.*
 
 class MainActivity : AppCompatActivity() {
 
+    private lateinit var mainActivityComponent: MainActivityComponent
+    private val flow: MutableStateFlow<Int> = MutableStateFlow(-1)
+
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        mainActivityComponent = DaggerMainActivityComponent.factory().create(this, flow)
+
+        supportFragmentManager.beginTransaction().add(R.id.container, FragmentReceiver()).commit()
+        supportFragmentManager.beginTransaction().add(R.id.container, FragmentProducer()).commit()
     }
+
+    fun getComponent(): MainActivityComponent = mainActivityComponent
 }

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

@@ -0,0 +1,41 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import dagger.*
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.StateFlow
+
+@Component(modules = [ColorGeneratorModule::class, StateFlowModule::class])
+interface MainActivityComponent {
+
+    fun provideContext(): Context
+
+    fun provideFlow(): StateFlow<Int>
+
+    fun provideMutableFlow(): MutableStateFlow<Int>
+
+    fun provideColorGenerator(): ColorGenerator
+
+    @Component.Factory
+    interface Factory {
+
+        fun create(
+            @BindsInstance context: Context,
+            @BindsInstance flow: MutableStateFlow<Int>
+        ): MainActivityComponent
+    }
+}
+
+@Module
+interface ColorGeneratorModule {
+
+    @Binds
+    fun bindColorGenerator(colorGeneratorImpl: ColorGeneratorImpl): ColorGenerator
+}
+
+@Module
+interface StateFlowModule {
+
+    @Binds
+    fun bindStateFlow(mutableStateFlow: MutableStateFlow<Int>): StateFlow<Int>
+}

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

@@ -3,14 +3,20 @@ package ru.otus.daggerhomework
 import android.content.Context
 import android.widget.Toast
 import androidx.fragment.app.FragmentActivity
+import kotlinx.coroutines.flow.*
+import javax.inject.Inject
 
-class ViewModelProducer(
+class ViewModelProducer @Inject constructor(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
+    private val context: Context,
+    private val flow: MutableStateFlow<Int>
 ) {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
+
+        flow.value = colorGenerator.generateColor()
+
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
     }
 }

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

@@ -3,13 +3,18 @@ package ru.otus.daggerhomework
 import android.app.Application
 import android.content.Context
 import android.widget.Toast
+import kotlinx.coroutines.flow.*
+import javax.inject.Inject
 
-class ViewModelReceiver(
-    private val context: Context
+class ViewModelReceiver @Inject constructor(
+    private val context: Context,
+    private val colorFlow: StateFlow<Int>
 ) {
 
-    fun observeColors() {
+    fun observeColors(): Flow<Int> {
         if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
         Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
+
+        return colorFlow
     }
 }

app/src/main/res/layout/activity_main.xml

@@ -1,19 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <androidx.constraintlayout.widget.ConstraintLayout
+    android:id="@+id/container"
     xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context=".MainActivity">
-
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintLeft_toLeftOf="parent"
-        app:layout_constraintRight_toRightOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
-
-</androidx.constraintlayout.widget.ConstraintLayout>
+    tools:context=".MainActivity" />