Final Results

Your overall top-level build.gradle file should now resemble:

buildscript {
  ext.nav_version = '2.3.5'

  repositories {
    google()
    mavenCentral()
  }

  dependencies {
    classpath 'com.android.tools.build:gradle:7.0.2'
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.21"
    classpath "androidx.navigation:navigation-safe-args-gradle-plugin:$nav_version"
  }
}

task clean(type: Delete) {
  delete rootProject.buildDir
}

ext {
  koin_version = "3.1.2"
}

(from T13-DI/ToDo/build.gradle)

Your app/build.gradle file should look like:

plugins {
  id 'com.android.application'
  id 'kotlin-android'
  id 'androidx.navigation.safeargs.kotlin'
}

android {
  compileSdk 31

  defaultConfig {
    applicationId "com.commonsware.todo"
    minSdk 21
    targetSdk 31
    versionCode 1
    versionName "1.0"

    testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
  }

  buildTypes {
    release {
      minifyEnabled false
      proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
    }
  }

  buildFeatures {
    viewBinding true
  }

  compileOptions {
    coreLibraryDesugaringEnabled true
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }

  kotlinOptions {
    jvmTarget = '1.8'
  }
}

dependencies {
  implementation 'androidx.core:core-ktx:1.6.0'
  implementation 'androidx.appcompat:appcompat:1.3.1'
  implementation 'androidx.constraintlayout:constraintlayout:2.1.0'
  implementation "androidx.recyclerview:recyclerview:1.2.1"
  implementation "androidx.navigation:navigation-fragment-ktx:$nav_version"
  implementation "androidx.navigation:navigation-ui-ktx:$nav_version"
  implementation 'com.google.android.material:material:1.4.0'
  implementation "io.insert-koin:koin-android:$koin_version"
  coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
  testImplementation 'junit:junit:4.13.2'
  androidTestImplementation 'androidx.test.ext:junit:1.1.3'
  androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}

(from T13-DI/ToDo/app/build.gradle)

The manifest should look something like:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.commonsware.todo">

  <supports-screens
    android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:xlargeScreens="true" />

  <application
    android:name=".ToDoApp"
    android:allowBackup="false"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.ToDo">
    <activity
      android:name=".AboutActivity"
      android:exported="true" />
    <activity
      android:name=".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>

(from T13-DI/ToDo/app/src/main/AndroidManifest.xml)

And, our new ToDoApp should look like:

package com.commonsware.todo

import android.app.Application
import org.koin.android.ext.koin.androidLogger
import org.koin.core.context.startKoin
import org.koin.dsl.module

class ToDoApp : Application() {
  private val koinModule = module {
    single { ToDoRepository() }
  }

  override fun onCreate() {
    super.onCreate()

    startKoin {
      androidLogger()
      modules(koinModule)
    }
  }
}

(from T13-DI/ToDo/app/src/main/java/com/commonsware/todo/ToDoApp.kt)

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