- Adding Koin DI to KMM Sample Project

androidApp/build.gradle.kts

@@ -32,4 +32,8 @@ dependencies {
     implementation("com.google.android.material:material:1.9.0")
     implementation("androidx.appcompat:appcompat:1.6.1")
     implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+
+    //Koin
+    implementation("io.insert-koin:koin-android:3.4.2")
+    implementation("io.insert-koin:koin-core:3.4.2")
 }

androidApp/src/main/AndroidManifest.xml

@@ -2,18 +2,18 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
 
     <application
+        android:name="com.jetbrains.kmm.androidApp.KmmApplication"
         android:allowBackup="false"
+        android:label="@string/app_name"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
         <activity
-            android:name="com.jetbrains.kmm.androidApp.MainActivity"
+            android:name="com.jetbrains.kmm.androidApp.ui.MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
-
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
     </application>
-
-</manifest>
+</manifest> 

androidApp/src/main/java/com/jetbrains/kmm/androidApp/KmmApplication.kt

@@ -0,0 +1,23 @@
+package com.jetbrains.kmm.androidApp
+
+import android.app.Application
+import com.jetbrains.kmm.androidApp.di.androidAppModule
+import com.jetbrains.kmm.shared.di.appModule
+import org.koin.android.ext.koin.androidContext
+import org.koin.android.ext.koin.androidLogger
+//import org.koin.core.context.GlobalContext.startKoin
+import org.koin.core.context.startKoin
+import org.koin.core.logger.Level
+
+class KmmApplication : Application() {
+
+    override fun onCreate() {
+        super.onCreate()
+
+        startKoin {
+            androidContext(this@KmmApplication)
+            androidLogger(Level.DEBUG)
+            modules(appModule() + androidAppModule)
+        }
+    }
+}

androidApp/src/main/java/com/jetbrains/kmm/androidApp/di/androidAppModule.kt

@@ -0,0 +1,9 @@
+package com.jetbrains.kmm.androidApp.di
+
+import org.koin.core.module.dsl.singleOf
+import org.koin.dsl.module
+import com.jetbrains.kmm.androidApp.presenter.GreetingPresenter
+
+val androidAppModule = module {
+    singleOf(::GreetingPresenter)
+}

androidApp/src/main/java/com/jetbrains/kmm/androidApp/presenter/GreetingPresenter.kt

@@ -0,0 +1,7 @@
+package com.jetbrains.kmm.androidApp.presenter
+
+import com.jetbrains.kmm.shared.Greeting
+
+class GreetingPresenter(private val greeting: Greeting) {
+    fun sayHello() = greeting.sayHello()
+}

androidApp/src/main/java/com/jetbrains/kmm/androidApp/MainActivity.kt → androidApp/src/main/java/com/jetbrains/kmm/androidApp/ui/MainActivity.kt

@@ -1,4 +1,4 @@
-package com.jetbrains.kmm.androidApp
+package com.jetbrains.kmm.androidApp.ui
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
@@ -9,31 +9,40 @@ import com.jetbrains.kmm.shared.Greeting
 import com.jetbrains.kmm.shared.Calculator
 import android.widget.TextView
 import com.jetbrains.androidApp.R
+import com.jetbrains.kmm.androidApp.presenter.GreetingPresenter
+import org.koin.android.ext.android.inject
 
+//create instance of greeting() Without DI
 fun greet(): String {
     return Greeting().greeting()
 }
 
 class MainActivity : AppCompatActivity() {
+
+    //create instance of GreetingPresenter using DI
+    private val presenter: GreetingPresenter by inject()
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
-        val tv: TextView = findViewById(R.id.textView)
-        tv.text = greet()
+        val tv1: TextView = findViewById(R.id.textView1)
+        val tv2: TextView = findViewById(R.id.textView2)
+
+        tv1.text = greet()
+        tv2.text = presenter.sayHello()
 
         val numATV: EditText = findViewById(R.id.editTextNumberDecimalA)
         val numBTV: EditText = findViewById(R.id.editTextNumberDecimalB)
 
         val sumTV: TextView = findViewById(R.id.textViewSum)
 
-        val textWatcher = object: TextWatcher {
+        val textWatcher = object : TextWatcher {
             override fun afterTextChanged(s: Editable?) {
                 try {
                     val numA = Integer.parseInt(numATV.text.toString())
                     val numB = Integer.parseInt(numBTV.text.toString())
-                    sumTV.text =  "= " + Calculator.sum(numA, numB).toString()
-                } catch(e: NumberFormatException) {
+                    sumTV.text = "= " + Calculator.sum(numA, numB).toString()
+                } catch (e: NumberFormatException) {
                     sumTV.text = "= 🤔"
                 }
             }

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

@@ -1,59 +1,67 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.constraintlayout.widget.ConstraintLayout
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:tools="http://schemas.android.com/tools"
+<androidx.constraintlayout.widget.ConstraintLayout 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:id="@+id/main_view"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:id="@+id/main_view"
-    tools:context="com.jetbrains.kmm.androidApp.MainActivity">
-
-  <LinearLayout
-      android:layout_width="wrap_content"
-      android:layout_height="wrap_content"
-      android:orientation="vertical"
-      app:layout_constraintBottom_toBottomOf="parent"
-      app:layout_constraintLeft_toLeftOf="parent"
-      app:layout_constraintRight_toRightOf="parent"
-      app:layout_constraintTop_toTopOf="parent">
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        android:id="@+id/textView"
-        />
+    tools:context="com.jetbrains.kmm.androidApp.ui.MainActivity">
+
     <LinearLayout
         android:layout_width="wrap_content"
-        android:layout_height="match_parent"
-        android:orientation="horizontal">
-
-      <EditText
-          android:id="@+id/editTextNumberDecimalA"
-          android:layout_width="30dp"
-          android:layout_height="wrap_content"
-          android:ems="10"
-          android:inputType="number"
-          android:autofillHints="" />
-      <TextView
-          android:layout_width="wrap_content"
-          android:layout_height="wrap_content"
-          android:text="+"
-          />
-      <EditText
-          android:id="@+id/editTextNumberDecimalB"
-          android:layout_width="30dp"
-          android:layout_height="wrap_content"
-          android:ems="10"
-          android:inputType="number"
-          android:autofillHints="" />
-      <TextView
-          android:layout_width="wrap_content"
-          android:layout_height="wrap_content"
-          android:id="@+id/textViewSum"
-          android:text="= 🤔"
-          />
+        android:layout_height="wrap_content"
+        android:orientation="vertical"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent">
+
+        <TextView
+            android:id="@+id/textView1"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Hello World!" />
+
+
+        <TextView
+            android:id="@+id/textView2"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Hello World!" />
+
+        <LinearLayout
+            android:layout_width="wrap_content"
+            android:layout_height="match_parent"
+            android:orientation="horizontal">
+
+            <EditText
+                android:id="@+id/editTextNumberDecimalA"
+                android:layout_width="30dp"
+                android:layout_height="wrap_content"
+                android:autofillHints=""
+                android:ems="10"
+                android:inputType="number" />
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="+" />
+
+            <EditText
+                android:id="@+id/editTextNumberDecimalB"
+                android:layout_width="30dp"
+                android:layout_height="wrap_content"
+                android:autofillHints=""
+                android:ems="10"
+                android:inputType="number" />
+
+            <TextView
+                android:id="@+id/textViewSum"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="@string/thinking_smiley" />
+        </LinearLayout>
     </LinearLayout>
-  </LinearLayout>
 
 
 </androidx.constraintlayout.widget.ConstraintLayout>

androidApp/src/main/res/values/strings.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <string name="thinking_smiley">= 🤔</string>
+    <string name="app_name">KMM Sample</string>
+</resources>

iosApp/iosApp/iOSApp.swift

@@ -2,6 +2,11 @@ import SwiftUI
 
 @main
 struct SampleApp: App {
+
+  init() {
+        HelperKt.doInitKoin()
+    }
+
     var body: some Scene {
         WindowGroup {
             ContentView()

shared/build.gradle.kts

@@ -25,6 +25,11 @@ kotlin {
     }
 
     sourceSets {
+        val commonMain by getting {
+            dependencies {
+                implementation("io.insert-koin:koin-android:3.4.2")
+            }
+        }
         val commonTest by getting {
             dependencies {
                 implementation(kotlin("test-common"))

shared/src/androidMain/kotlin/com/jetbrains/kmm/shared/Platform.kt

@@ -1,5 +1,9 @@
 package com.jetbrains.kmm.shared
 
 actual class Platform actual constructor() {
-    actual val platform: String = "Android ${android.os.Build.VERSION.SDK_INT}"
+    //without DI
+    actual val platform: String = "Android ${android.os.Build.VERSION.SDK_INT} without DI"
+
+    // With DI
+    actual val newVal = "from Android using DI!"
 }

shared/src/commonMain/kotlin/com/jetbrains/kmm/shared/Greeting.kt

@@ -4,4 +4,8 @@ class Greeting {
     fun greeting(): String {
         return "Hello, ${Platform().platform}!"
     }
+
+    fun sayHello():String{
+        return "Hello ${Platform().newVal}"
+    }
 }

shared/src/commonMain/kotlin/com/jetbrains/kmm/shared/Platform.kt

@@ -2,4 +2,5 @@ package com.jetbrains.kmm.shared
 
 expect class Platform() {
     val platform: String
+    val newVal:String
 }

shared/src/commonMain/kotlin/com/jetbrains/kmm/shared/di/AppModule.kt

@@ -0,0 +1,3 @@
+package com.jetbrains.kmm.shared.di
+
+fun appModule() = listOf(platformModule, commonModule)

shared/src/commonMain/kotlin/com/jetbrains/kmm/shared/di/CommonModule.kt

@@ -0,0 +1,9 @@
+package com.jetbrains.kmm.shared.di
+
+import org.koin.core.module.dsl.singleOf
+import org.koin.dsl.module
+import com.jetbrains.kmm.shared.Greeting
+
+val commonModule = module {
+    singleOf(::Greeting)
+}

shared/src/commonMain/kotlin/com/jetbrains/kmm/shared/di/PlatformModule.kt

@@ -0,0 +1,10 @@
+package com.jetbrains.kmm.shared.di
+
+import org.koin.dsl.module
+import com.jetbrains.kmm.shared.Platform
+import org.koin.core.module.dsl.singleOf
+
+
+val platformModule = module {
+    singleOf(::Platform)
+}

shared/src/iosMain/kotlin/com/jetbrains/kmm/shared/Helper.kt

@@ -0,0 +1,17 @@
+package com.jetbrains.kmm.shared
+
+import com.jetbrains.kmm.shared.di.appModule
+import org.koin.core.component.KoinComponent
+import org.koin.core.component.inject
+import org.koin.core.context.startKoin
+
+class GreetingHelper : KoinComponent {
+    private val greeting: Greeting by inject()
+    fun greet(): String = greeting.greeting()
+}
+
+fun initKoin() {
+    startKoin {
+        modules(appModule())
+    }
+}

shared/src/iosMain/kotlin/com/jetbrains/kmm/shared/Platform.kt

@@ -4,4 +4,5 @@ import platform.UIKit.UIDevice
 
 actual class Platform actual constructor() {
     actual val platform: String = UIDevice.currentDevice.systemName() + " " + UIDevice.currentDevice.systemVersion
+    actual val newVal = "from iOS!"
 }