Dagger2 - дз Лисица

app/build.gradle

@@ -5,13 +5,13 @@ plugins {
 }
 
 android {
-    compileSdkVersion 30
+    compileSdkVersion 31
     buildToolsVersion "30.0.3"
 
     defaultConfig {
         applicationId "ru.otus.daggerhomework"
         minSdkVersion 23
-        targetSdkVersion 30
+        targetSdkVersion 31
         versionCode 1
         versionName "1.0"
 
@@ -41,4 +41,10 @@ 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 'org.jetbrains.kotlinx:kotlinx-coroutines-core:1.4.2'
+    implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.4.2'
+
+    implementation 'androidx.fragment:fragment-ktx:1.4.1'
+    //    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.5.0-rc01")
 }

app/src/main/AndroidManifest.xml

@@ -1,16 +1,18 @@
 <?xml version="1.0" encoding="utf-8"?>
-<manifest
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
     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

@@ -1,6 +1,17 @@
 package ru.otus.daggerhomework
 
 import android.app.Application
+import ru.otus.daggerhomework.di.app.ApplicationComponent
+import ru.otus.daggerhomework.di.app.DaggerApplicationComponent
+
+class App : Application() {
+
+    val componentInstance: ApplicationComponent by lazy {
+        createApplicationComponent()
+    }
+
+    private fun createApplicationComponent(): ApplicationComponent = DaggerApplicationComponent
+        .factory()
+        .create(context = this)
 
-class App :Application() {
 }

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

@@ -2,19 +2,24 @@ 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()
-        return Color.argb(255, rnd.nextInt(256), rnd.nextInt(256), rnd.nextInt(256))
+        return Color.argb(
+            255,
+            rnd.nextInt(256),
+            rnd.nextInt(256),
+            rnd.nextInt(256)
+        )
     }
 }

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

@@ -6,9 +6,19 @@ 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 onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        injectDependencies()
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
@@ -20,7 +30,16 @@ class FragmentProducer : Fragment() {
     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()
         }
     }
+
+    private fun injectDependencies() {
+        val component = (activity as MainActivity)
+            .activityComponent
+            .provideFragmentProducerComponentFactory()
+            .create()
+
+        component.inject(this)
+    }
 }

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

@@ -4,14 +4,26 @@ 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.lifecycleScope
+import kotlinx.coroutines.flow.collect
+import kotlinx.coroutines.launch
+import javax.inject.Inject
 
 class FragmentReceiver : Fragment() {
 
+    @Inject
+    lateinit var viewModelReceiver: ViewModelReceiver
+
     private lateinit var frame: View
 
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        injectDependencies()
+    }
+
     override fun onCreateView(
         inflater: LayoutInflater,
         container: ViewGroup?,
@@ -23,9 +35,24 @@ class FragmentReceiver : Fragment() {
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
         frame = view.findViewById(R.id.frame)
+
+        viewLifecycleOwner.lifecycleScope.launch {
+            viewModelReceiver
+                .colorsFlow
+                .collect(this@FragmentReceiver::populateColor)
+        }
     }
 
-    fun populateColor(@ColorInt color: Int) {
+    private fun populateColor(@ColorInt color: Int) {
         frame.setBackgroundColor(color)
     }
+
+    private fun injectDependencies() {
+        val component = (activity as MainActivity)
+            .activityComponent
+            .provideFragmentReceiverComponentFactory()
+            .create()
+
+        component.inject(this)
+    }
 }

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

@@ -1,11 +1,34 @@
 package ru.otus.daggerhomework
 
-import androidx.appcompat.app.AppCompatActivity
+import android.content.Context
 import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import ru.otus.daggerhomework.di.activity.ActivityComponent
+import ru.otus.daggerhomework.di.qualifiers.AppContext
+import javax.inject.Inject
 
 class MainActivity : AppCompatActivity() {
+
+    @AppContext
+    @Inject
+    lateinit var appContext: Context
+
+    val activityComponent: ActivityComponent by lazy {
+        createActivityComponent()
+    }
+
     override fun onCreate(savedInstanceState: Bundle?) {
+        injectDependencies()
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
     }
+
+    private fun injectDependencies() {
+        activityComponent.inject(this)
+    }
+
+    private fun createActivityComponent(): ActivityComponent = (application as App)
+        .componentInstance
+        .provideActivityComponentFactory()
+        .create(context = this)
 }

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

@@ -1,19 +1,21 @@
 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 java.lang.RuntimeException
+import kotlinx.coroutines.flow.MutableStateFlow
+import ru.otus.daggerhomework.di.qualifiers.ActivityContext
+import javax.inject.Inject
 
-class ViewModelProducer(
+class ViewModelProducer @Inject constructor(
     private val colorGenerator: ColorGenerator,
-    private val context: Context
-) : ViewModel() {
+    @ActivityContext private val context: Context,
+    private val stateFlow: MutableStateFlow<Int>
+) {
 
     fun generateColor() {
         if (context !is FragmentActivity) throw RuntimeException("Здесь нужен контекст активити")
         Toast.makeText(context, "Color sent", Toast.LENGTH_LONG).show()
+        stateFlow.value = colorGenerator.generateColor()
     }
 }

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

@@ -2,16 +2,24 @@ package ru.otus.daggerhomework
 
 import android.app.Application
 import android.content.Context
+import android.util.Log
 import android.widget.Toast
-import androidx.fragment.app.FragmentActivity
-import androidx.lifecycle.ViewModel
-import java.lang.RuntimeException
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.filter
+import kotlinx.coroutines.flow.onEach
+import ru.otus.daggerhomework.di.qualifiers.AppContext
+import javax.inject.Inject
 
-class ViewModelReceiver(
-    private val context: Context
-) : ViewModel() {
+class ViewModelReceiver @Inject constructor(
+    @AppContext private val context: Context,
+    flow: StateFlow<Int>
+) {
 
-    fun observeColors() {
+    val colorsFlow = flow
+        .filter { it != 0 }
+        .onEach { observeColors() }
+
+    private fun observeColors() {
         if (context !is Application) throw RuntimeException("Здесь нужен контекст апликейшена")
         Toast.makeText(context, "Color received", Toast.LENGTH_LONG).show()
     }

app/src/main/java/ru/otus/daggerhomework/di/activity/ActivityComponent.kt

@@ -0,0 +1,46 @@
+package ru.otus.daggerhomework.di.activity
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Module
+import dagger.Provides
+import dagger.Subcomponent
+import kotlinx.coroutines.flow.MutableStateFlow
+import ru.otus.daggerhomework.MainActivity
+import ru.otus.daggerhomework.di.customscopes.ActivityScope
+import ru.otus.daggerhomework.di.fragment.FragmentProducerComponent
+import ru.otus.daggerhomework.di.fragment.FragmentReceiverComponent
+import ru.otus.daggerhomework.di.qualifiers.ActivityContext
+
+@ActivityScope
+@Subcomponent(modules = [ActivityComponentModule::class])
+interface ActivityComponent {
+
+    fun provideFragmentProducerComponentFactory(): FragmentProducerComponent.Factory
+
+    fun provideFragmentReceiverComponentFactory(): FragmentReceiverComponent.Factory
+
+    fun inject(activity: MainActivity)
+
+    @Subcomponent.Factory
+    interface Factory {
+        fun create(
+            @ActivityContext
+            @BindsInstance
+            context: Context
+        ): ActivityComponent
+    }
+}
+
+@Module(
+    subcomponents = [
+        FragmentProducerComponent::class,
+        FragmentProducerComponent::class
+    ]
+)
+class ActivityComponentModule {
+
+    @ActivityScope
+    @Provides
+    fun provideObserver(): MutableStateFlow<Int> = MutableStateFlow(0)
+}

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

@@ -0,0 +1,29 @@
+package ru.otus.daggerhomework.di.app
+
+import android.content.Context
+import dagger.BindsInstance
+import dagger.Component
+import dagger.Module
+import ru.otus.daggerhomework.di.activity.ActivityComponent
+import ru.otus.daggerhomework.di.qualifiers.AppContext
+import javax.inject.Singleton
+
+@Singleton
+@Component(modules = [ApplicationComponentModule::class])
+interface ApplicationComponent {
+
+    fun provideActivityComponentFactory(): ActivityComponent.Factory
+
+    @Component.Factory
+    interface Factory {
+
+        fun create(
+            @AppContext
+            @BindsInstance
+            context: Context
+        ): ApplicationComponent
+    }
+}
+
+@Module(subcomponents = [ActivityComponent::class])
+class ApplicationComponentModule

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

@@ -0,0 +1,6 @@
+package ru.otus.daggerhomework.di.customscopes
+
+import javax.inject.Scope
+
+@Scope
+annotation class ActivityScope

app/src/main/java/ru/otus/daggerhomework/di/customscopes/AppScope.kt

@@ -0,0 +1,6 @@
+package ru.otus.daggerhomework.di.customscopes
+
+import javax.inject.Scope
+
+@Scope
+annotation class AppScope