From 309cc343934bc5875438935f3cf8aba1878934a5 Mon Sep 17 00:00:00 2001
From: Elisey Lobanov <crimsonorama@gmail.com>
Date: Fri, 20 May 2022 19:20:54 +0300
Subject: [PATCH] Dagger Homework

---
 app/build.gradle                              |  6 +++
 app/src/main/AndroidManifest.xml              |  1 +
 .../main/java/ru/otus/daggerhomework/App.kt   | 17 ++++++-
 .../daggerhomework/ApplicationComponent.kt    | 42 +++++++++++++++++-
 .../ru/otus/daggerhomework/ColorGenerator.kt  |  3 +-
 .../otus/daggerhomework/FragmentProducer.kt   | 44 ++++++++++++++++++-
 .../otus/daggerhomework/FragmentReceiver.kt   | 38 ++++++++++++++--
 .../ru/otus/daggerhomework/MainActivity.kt    | 39 +++++++++++++++-
 .../otus/daggerhomework/ViewModelProducer.kt  | 25 +++++++++--
 .../otus/daggerhomework/ViewModelReceiver.kt  | 31 ++++++++++---
 app/src/main/res/layout/activity_main.xml     | 23 +++++++---
 app/src/main/res/layout/fragment_a.xml        |  2 +-
 app/src/main/res/layout/fragment_b.xml        |  3 +-
 build.gradle                                  |  2 +-
 14 files changed, 248 insertions(+), 28 deletions(-)

diff --git a/app/build.gradle b/app/build.gradle
index a5609bb9..7ba79305 100644
--- a/app/build.gradle
+++ b/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'
 }
\ No newline at end of file
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index fe328c68..2a310058 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/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"
diff --git a/app/src/main/java/ru/otus/daggerhomework/App.kt b/app/src/main/java/ru/otus/daggerhomework/App.kt
index de363626..10bde6a3 100644
--- a/app/src/main/java/ru/otus/daggerhomework/App.kt
+++ b/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() {
-}
\ No newline at end of file
+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
+    }
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/ApplicationComponent.kt b/app/src/main/java/ru/otus/daggerhomework/ApplicationComponent.kt
index fc47f256..17f0fb24 100644
--- a/app/src/main/java/ru/otus/daggerhomework/ApplicationComponent.kt
+++ b/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 {
-}
\ No newline at end of file
+
+    @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
diff --git a/app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt b/app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt
index a9e25a27..c0d6c919 100644
--- a/app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt
+++ b/app/src/main/java/ru/otus/daggerhomework/ColorGenerator.kt
@@ -4,6 +4,7 @@ import android.graphics.Color
 import androidx.annotation.ColorInt
 import androidx.annotation.ColorRes
 import java.util.*
+import javax.inject.Inject
 
 interface ColorGenerator {
 
@@ -11,7 +12,7 @@ interface ColorGenerator {
     fun generateColor(): Int
 }
 
-class ColorGeneratorImpl : ColorGenerator {
+class ColorGeneratorImpl @Inject constructor(): ColorGenerator {
 
     override fun generateColor(): Int {
         val rnd = Random()
diff --git a/app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt b/app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt
index 00dd10dc..48f8554a 100644
--- a/app/src/main/java/ru/otus/daggerhomework/FragmentProducer.kt
+++ b/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()
         }
     }
-}
\ No newline at end of file
+}
+
+@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
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt b/app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt
index e6a3d9af..2ed958e0 100644
--- a/app/src/main/java/ru/otus/daggerhomework/FragmentReceiver.kt
+++ b/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)
 }
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/MainActivity.kt b/app/src/main/java/ru/otus/daggerhomework/MainActivity.kt
index 1e7e2403..360d8aa4 100644
--- a/app/src/main/java/ru/otus/daggerhomework/MainActivity.kt
+++ b/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)
     }
-}
\ No newline at end of file
+}
+
+@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
+
diff --git a/app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt b/app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt
index cb805a7a..7b1da8b7 100644
--- a/app/src/main/java/ru/otus/daggerhomework/ViewModelProducer.kt
+++ b/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
     }
 }
\ No newline at end of file
diff --git a/app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt b/app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt
index 53ee6ff3..64e6b748 100644
--- a/app/src/main/java/ru/otus/daggerhomework/ViewModelReceiver.kt
+++ b/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
     }
 }
\ No newline at end of file
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
index 79ae6993..5dd3c036 100644
--- a/app/src/main/res/layout/activity_main.xml
+++ b/app/src/main/res/layout/activity_main.xml
@@ -7,13 +7,22 @@
     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"
+    <fragment
+        android:id="@+id/fragment_receiver"
+        android:name="ru.otus.daggerhomework.FragmentReceiver"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toTopOf="@+id/fragment_producer"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <androidx.fragment.app.FragmentContainerView
+        android:id="@+id/fragment_producer"
+        android:name="ru.otus.daggerhomework.FragmentProducer"
+        android:layout_width="match_parent"
+        android:layout_height="300dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent" />
 </androidx.constraintlayout.widget.ConstraintLayout>
\ No newline at end of file
diff --git a/app/src/main/res/layout/fragment_a.xml b/app/src/main/res/layout/fragment_a.xml
index 3ca899bb..ac5f6842 100644
--- a/app/src/main/res/layout/fragment_a.xml
+++ b/app/src/main/res/layout/fragment_a.xml
@@ -3,7 +3,7 @@
     xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="300dp">
 
     <Button
         android:id="@+id/button"
diff --git a/app/src/main/res/layout/fragment_b.xml b/app/src/main/res/layout/fragment_b.xml
index 4edb4339..381ffb1a 100644
--- a/app/src/main/res/layout/fragment_b.xml
+++ b/app/src/main/res/layout/fragment_b.xml
@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/frame"
+    android:background="@color/black"
     android:layout_width="match_parent"
     android:layout_height="match_parent" />
\ No newline at end of file
diff --git a/build.gradle b/build.gradle
index e47bb55b..4fb1f3d6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,6 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = "1.4.32"
+    ext.kotlin_version = "1.6.0"
     repositories {
         google()
         jcenter()