Dagger2 homework Белянин Роман

app/build.gradle

@@ -41,4 +41,6 @@ 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 "androidx.activity:activity-ktx:1.3.+"
+    implementation 'androidx.fragment:fragment-ktx:1.3.+'
 }

app/src/main/AndroidManifest.xml

@@ -8,6 +8,7 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
+        android:name=".App"
         android:supportsRtl="true"
         android:theme="@style/Theme.DaggerHomework">
         <activity android:name=".MainActivity">

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework
+
+import javax.inject.Qualifier
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class ActivityContext

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework
+
+import javax.inject.Scope
+
+@Scope
+@Retention
+annotation class ActivityScope

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

@@ -2,5 +2,11 @@ package ru.otus.daggerhomework
 
 import android.app.Application
 
-class App :Application() {
+class App : Application() {
+
+    val appComponent by lazy {
+        DaggerApplicationComponent
+            .factory()
+            .create(this)
+    }
 }

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

@@ -1,4 +1,41 @@
 package ru.otus.daggerhomework
 
+import android.app.Application
+import android.content.Context
+import androidx.lifecycle.ViewModelProvider
+import dagger.*
+import kotlinx.coroutines.flow.MutableStateFlow
+import javax.inject.Singleton
+
+@Singleton
+@Component(modules = [ApplicationModule::class])
 interface ApplicationComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun create(
+            @BindsInstance  @ApplicationContext context: Context
+        ): ApplicationComponent
+    }
+
+    @ApplicationContext
+    fun provideApplicationContext(): Context
+
+    fun provideColorGenerator(): ColorGenerator
+
+    fun provideState(): MutableStateFlow<Int>
+}
+
+@Module
+interface ApplicationModule {
+
+    companion object {
+        @Provides
+        @Singleton
+        fun provideState() = MutableStateFlow(0)
+    }
+
+    @Binds
+    @Singleton
+    fun bindColorGenerator(generator: ColorGeneratorImpl): ColorGenerator
 }

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework
+
+import javax.inject.Qualifier
+
+@Qualifier
+@Retention(AnnotationRetention.BINARY)
+annotation class ApplicationContext

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

@@ -1,26 +1,41 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
 import android.os.Bundle
 import android.view.LayoutInflater
 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: ProducerFactory
+    val viewModel: ViewModelProducer by viewModels {viewModelFactory}
+
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        FragmentProducerComponent.crete(
+                (requireActivity() as MainActivity).activityComponent
+        ).inject(this)
+    }
+
     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
+            viewModel.generateColor()
         }
     }
 }

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

@@ -0,0 +1,19 @@
+package ru.otus.daggerhomework
+
+import dagger.Component
+
+@FragmentScope
+@Component(dependencies = [MainActivityComponent::class])
+interface FragmentProducerComponent {
+
+    companion object {
+        fun crete(
+              activityComponent: MainActivityComponent
+        ) = DaggerFragmentProducerComponent.builder()
+                .mainActivityComponent(activityComponent)
+                .build()
+
+    }
+    fun inject(fragment: FragmentProducer)
+
+}

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

@@ -1,28 +1,51 @@
 package ru.otus.daggerhomework
 
+import android.content.Context
 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 kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
+import javax.inject.Inject
+import javax.inject.Named
 
 class FragmentReceiver : Fragment() {
 
+    @Inject
+    lateinit var viewModelFactory: ReceiverFactory
+    val viewModel: ViewModelReceiver by viewModels {viewModelFactory}
+
     private lateinit var frame: View
 
+    override fun onAttach(context: Context) {
+        super.onAttach(context)
+        FragmentReceiverComponent
+            .create((requireContext().applicationContext as App).appComponent)
+            .inject(this)
+    }
+
     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)
+        GlobalScope.launch {
+            viewModel.stateFlow.collect {
+                populateColor(it)
+            }
+        }
     }
 
     fun populateColor(@ColorInt color: Int) {

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

@@ -0,0 +1,17 @@
+package ru.otus.daggerhomework
+
+import dagger.Component
+
+@FragmentScope
+@Component(dependencies = [ApplicationComponent::class])
+interface FragmentReceiverComponent {
+    companion object {
+
+        fun create (component: ApplicationComponent) =
+            DaggerFragmentReceiverComponent
+                .builder()
+                .applicationComponent(component)
+                .build()
+    }
+    fun inject(fragment: FragmentReceiver)
+}

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

@@ -0,0 +1,7 @@
+package ru.otus.daggerhomework
+
+import javax.inject.Scope
+
+@Scope
+@Retention
+annotation class FragmentScope

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

@@ -1,11 +1,27 @@
 package ru.otus.daggerhomework
 
-import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.fragment.app.FragmentTransaction
+import kotlinx.coroutines.flow.MutableStateFlow
+
 
 class MainActivity : AppCompatActivity() {
+
+    lateinit var activityComponent: MainActivityComponent
+
+
     override fun onCreate(savedInstanceState: Bundle?) {
+        activityComponent = DaggerMainActivityComponent.factory()
+            .crete(this, (this.applicationContext as App).appComponent)
+        activityComponent.inject(this)
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
+
+        val manager = supportFragmentManager
+        val transaction: FragmentTransaction = manager.beginTransaction()
+        transaction.add(R.id.container_fragment, FragmentProducer()).commit()
+        val transaction2: FragmentTransaction = manager.beginTransaction()
+        transaction2.add(R.id.container_fragment2, FragmentReceiver()).commit()
     }
 }

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

@@ -0,0 +1,32 @@
+package ru.otus.daggerhomework
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import kotlinx.coroutines.flow.MutableStateFlow
+
+@ActivityScope
+@Component(dependencies = [ApplicationComponent::class])
+interface MainActivityComponent {
+
+    @Component.Factory
+    interface Factory {
+        fun crete(
+            @ActivityContext @BindsInstance context: Context,
+            applicationComponent: ApplicationComponent,
+        ): MainActivityComponent
+    }
+
+
+    fun inject(activity: MainActivity)
+
+    @ApplicationContext
+    fun provideApplicationContext(): Context
+
+    @ActivityContext
+    fun provideActivityContext(): Context
+
+    fun provideColorGenerator(): ColorGenerator
+
+    fun provideState(): MutableStateFlow<Int>
+}

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

@@ -5,15 +5,30 @@ import android.content.Context
 import android.widget.Toast
 import androidx.fragment.app.FragmentActivity
 import androidx.lifecycle.ViewModel
+import androidx.lifecycle.ViewModelProvider
+import kotlinx.coroutines.flow.MutableStateFlow
 import java.lang.RuntimeException
+import javax.inject.Inject
 
-class ViewModelProducer(
+class ViewModelProducer constructor (
     private val colorGenerator: ColorGenerator,
-    private val context: Context
+    private val context: Context,
+    private val state: MutableStateFlow<Int>
 ) : ViewModel() {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
-        Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        Toast.makeText(context, "Color sent ${colorGenerator.generateColor()}",
+            Toast.LENGTH_LONG).show()
+        state.value = colorGenerator.generateColor()
+    }
+}
+class ProducerFactory @Inject constructor(
+    private val colorGenerator: ColorGenerator,
+    @ActivityContext  private val context: Context,
+    val state: MutableStateFlow<Int>): ViewModelProvider.Factory {
+
+    override fun <T : ViewModel?> create(modelClass: Class<T>): T {
+        return ViewModelProducer(colorGenerator, context, state) as T
     }
 }