├── .gitignore ├── Kotlin_for_Android.pdf ├── LICENSE ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── oreilly │ │ └── hellokotlin │ │ ├── EspressoTest.kt │ │ ├── ExampleInstrumentedTest.kt │ │ └── db │ │ └── UserRepositoryTest.kt │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── oreilly │ │ │ └── hellokotlin │ │ │ ├── MainActivity.kt │ │ │ ├── WelcomeActivity.kt │ │ │ ├── astro │ │ │ ├── AstroRequest.kt │ │ │ ├── AstroResponseClasses.kt │ │ │ └── AstroService.kt │ │ │ ├── db │ │ │ ├── User.kt │ │ │ ├── UserDAO.kt │ │ │ ├── UserDatabase.kt │ │ │ └── UserRepository.kt │ │ │ └── ui │ │ │ └── WelcomeViewModel.kt │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ └── ic_launcher_background.xml │ │ ├── layout │ │ ├── activity_main.xml │ │ └── activity_welcome.xml │ │ ├── menu │ │ └── main.xml │ │ ├── mipmap-anydpi-v26 │ │ ├── ic_launcher.xml │ │ └── ic_launcher_round.xml │ │ ├── mipmap-hdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-mdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ ├── mipmap-xxxhdpi │ │ ├── ic_launcher.png │ │ └── ic_launcher_round.png │ │ └── values │ │ ├── colors.xml │ │ ├── strings.xml │ │ └── styles.xml │ └── test │ └── java │ └── com │ └── oreilly │ └── hellokotlin │ ├── ExampleUnitTest.kt │ └── astro │ └── AstroRequestTest.kt ├── build.gradle ├── gradle.properties ├── gradle ├── libs.versions.toml └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | .DS_Store 9 | /build 10 | /captures 11 | .externalNativeBuild 12 | -------------------------------------------------------------------------------- /Kotlin_for_Android.pdf: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/kousen/HelloKotlinAndroid/bfdba2dfb2cd94bbdcb96d81fa79a242eaf7e829/Kotlin_for_Android.pdf -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # HelloKotlinAndroid 2 | Basic "Hello, World!" Android app written in Kotlin 3 | 4 | Used for seminars on writing Android apps in Kotlin. 5 | 6 | Includes: 7 | 8 | * Uses view binding for layouts 9 | * Room library and coroutines for async access to db and JSON service 10 | * Gson for converting JSON data to Kotlin data classes 11 | 12 | Ken Kousen, ken.kousen@kousenit.com 13 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | plugins { 2 | alias libs.plugins.android.application 3 | alias libs.plugins.kotlin.android 4 | alias libs.plugins.kotlin.kapt 5 | alias libs.plugins.kotlin.serialization 6 | } 7 | 8 | android { 9 | compileSdkVersion 33 10 | defaultConfig { 11 | applicationId "com.oreilly.hellokotlin" 12 | minSdkVersion 23 13 | targetSdkVersion 33 14 | versionCode 1 15 | versionName "1.0" 16 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 17 | } 18 | buildTypes { 19 | release { 20 | minifyEnabled false 21 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 22 | } 23 | } 24 | compileOptions { 25 | sourceCompatibility = '1.8' 26 | targetCompatibility = '1.8' 27 | } 28 | kotlinOptions { 29 | jvmTarget = '1.8' 30 | } 31 | 32 | buildFeatures { 33 | viewBinding true 34 | } 35 | namespace 'com.oreilly.hellokotlin' 36 | } 37 | 38 | dependencies { 39 | implementation libs.android.appcompat 40 | 41 | implementation libs.coroutines.core 42 | implementation libs.coroutines.android 43 | implementation libs.fragment.ktx 44 | implementation libs.constraintLayout 45 | 46 | implementation libs.lifecycle.common.java8 47 | implementation libs.lifecycle.livedata.ktx 48 | implementation libs.lifecycle.viewmodel.ktx 49 | 50 | implementation libs.core.ktx 51 | implementation libs.lifecycle.runtime.ktx 52 | implementation libs.lifecycle.viewmodel.ktx 53 | 54 | kapt libs.room.compiler 55 | implementation libs.bundles.room 56 | androidTestImplementation libs.room.testing 57 | 58 | testImplementation libs.junit 59 | 60 | androidTestImplementation libs.test.runner 61 | androidTestImplementation libs.espresso 62 | androidTestImplementation libs.junit.ktx 63 | 64 | implementation libs.gson 65 | 66 | implementation libs.bundles.retrofit 67 | } 68 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/oreilly/hellokotlin/EspressoTest.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin 2 | 3 | import androidx.test.espresso.Espresso.onView 4 | import androidx.test.espresso.action.ViewActions.click 5 | import androidx.test.espresso.action.ViewActions.typeText 6 | import androidx.test.espresso.assertion.ViewAssertions.matches 7 | import androidx.test.espresso.matcher.ViewMatchers.withId 8 | import androidx.test.espresso.matcher.ViewMatchers.withText 9 | import androidx.test.ext.junit.rules.activityScenarioRule 10 | import androidx.test.ext.junit.runners.AndroidJUnit4 11 | import org.junit.Rule 12 | import org.junit.Test 13 | import org.junit.runner.RunWith 14 | 15 | @RunWith(AndroidJUnit4::class) 16 | class EspressoTest { 17 | 18 | // Alternative is @JvmField and @Rule instead of annotating getter 19 | @get:Rule 20 | val activityRule = activityScenarioRule() 21 | 22 | @Test 23 | fun nameUpdatesTextView() { 24 | onView(withId(R.id.edit_text)) 25 | .perform(typeText("Dolly")) 26 | 27 | onView(withId(R.id.hello_button)) 28 | .perform(click()) 29 | 30 | onView(withId(R.id.welcome_text)) 31 | .check(matches(withText("Hello, Dolly!"))) 32 | } 33 | } -------------------------------------------------------------------------------- /app/src/androidTest/java/com/oreilly/hellokotlin/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin 2 | 3 | import android.content.Context 4 | import androidx.test.core.app.ApplicationProvider 5 | import androidx.test.ext.junit.runners.AndroidJUnit4 6 | import org.junit.Test 7 | import org.junit.runner.RunWith 8 | 9 | import org.junit.Assert.* 10 | 11 | /** 12 | * Instrumented test, which will execute on an Android device. 13 | * 14 | * See [testing documentation](http://d.android.com/tools/testing). 15 | */ 16 | @RunWith(AndroidJUnit4::class) 17 | class ExampleInstrumentedTest { 18 | @Test 19 | fun useAppContext() { 20 | // Context of the app under test. 21 | val appContext = ApplicationProvider.getApplicationContext() 22 | assertEquals("com.oreilly.hellokotlin", appContext.packageName) 23 | } 24 | } 25 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/oreilly/hellokotlin/db/UserRepositoryTest.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.db 2 | 3 | import android.content.Context 4 | import androidx.room.Room 5 | import androidx.test.core.app.ApplicationProvider 6 | import androidx.test.ext.junit.runners.AndroidJUnit4 7 | import kotlinx.coroutines.flow.first 8 | import kotlinx.coroutines.runBlocking 9 | import org.junit.After 10 | import org.junit.Assert.assertEquals 11 | import org.junit.Before 12 | import org.junit.Test 13 | import org.junit.runner.RunWith 14 | import java.io.IOException 15 | 16 | @RunWith(AndroidJUnit4::class) 17 | class UserRepositoryTest { 18 | 19 | private lateinit var userDao: UserDAO 20 | private lateinit var db: UserDatabase 21 | private lateinit var repository: UserRepository 22 | 23 | @Before 24 | fun createDb() { 25 | val context = ApplicationProvider.getApplicationContext() 26 | db = Room.inMemoryDatabaseBuilder(context, UserDatabase::class.java) 27 | .allowMainThreadQueries() 28 | .build() 29 | userDao = db.userDao 30 | repository = UserRepository(userDao) 31 | // userDao.deleteAll() 32 | } 33 | 34 | @After 35 | @Throws(IOException::class) 36 | fun closeDb() { 37 | db.close() 38 | } 39 | 40 | @Test 41 | fun insertAndDeleteUser() = runBlocking { 42 | repository.deleteAllUsers() 43 | assertEquals(0, repository.allUsers.first().size) 44 | 45 | repository.insertUser("Picard") 46 | assertEquals(1, repository.allUsers.first().size) 47 | 48 | repository.insertUser("Picard") 49 | assertEquals(1, repository.allUsers.first().size) 50 | 51 | repository.deleteUsersByName("Picard") 52 | assertEquals(0, repository.allUsers.first().size) 53 | } 54 | } -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 6 | 7 | 13 | 15 | 16 | 17 | 18 | 19 | 20 | 23 | 24 | 25 | -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin 2 | 3 | import android.content.Intent 4 | import android.os.Bundle 5 | import android.view.View 6 | import androidx.appcompat.app.AppCompatActivity 7 | import com.oreilly.hellokotlin.databinding.ActivityMainBinding 8 | 9 | class MainActivity : AppCompatActivity() { 10 | 11 | private lateinit var binding: ActivityMainBinding 12 | 13 | override fun onCreate(savedInstanceState: Bundle?) { 14 | super.onCreate(savedInstanceState) 15 | 16 | binding = ActivityMainBinding.inflate(layoutInflater) 17 | setContentView(binding.root) 18 | 19 | binding.helloButton.setOnClickListener(this::sayHello) 20 | } 21 | 22 | @Suppress("UNUSED_PARAMETER") 23 | fun sayHello(v: View?) { 24 | Intent(this, WelcomeActivity::class.java).apply { 25 | putExtra(Intent.EXTRA_TEXT, binding.editText.text.toString()) 26 | startActivity(this) 27 | } 28 | } 29 | } 30 | -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/WelcomeActivity.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin 2 | 3 | import android.content.Intent 4 | import android.os.Bundle 5 | import android.view.Menu 6 | import android.view.MenuItem 7 | import android.widget.ArrayAdapter 8 | import android.widget.Toast 9 | import androidx.activity.viewModels 10 | import androidx.appcompat.app.AppCompatActivity 11 | import androidx.core.net.toUri 12 | import com.oreilly.hellokotlin.databinding.ActivityWelcomeBinding 13 | import com.oreilly.hellokotlin.db.User 14 | import com.oreilly.hellokotlin.db.UserDatabase 15 | import com.oreilly.hellokotlin.db.UserRepository 16 | import com.oreilly.hellokotlin.ui.WelcomeViewModel 17 | import com.oreilly.hellokotlin.ui.WelcomeViewModelFactory 18 | 19 | class WelcomeActivity : AppCompatActivity() { 20 | 21 | private val viewModel: WelcomeViewModel by viewModels { 22 | WelcomeViewModelFactory( 23 | UserRepository(UserDatabase.getInstance(applicationContext).userDao) 24 | ) 25 | } 26 | 27 | private lateinit var binding: ActivityWelcomeBinding 28 | 29 | override fun onCreate(savedInstanceState: Bundle?) { 30 | super.onCreate(savedInstanceState) 31 | binding = ActivityWelcomeBinding.inflate(layoutInflater) 32 | setContentView(binding.root) 33 | 34 | supportActionBar?.setDisplayHomeAsUpEnabled(true) 35 | 36 | viewModel.allUsers.observe(this) { users -> 37 | users.let { 38 | binding.namesList.adapter = ArrayAdapter( 39 | this, 40 | android.R.layout.simple_list_item_1, 41 | users.map(User::name) 42 | ) 43 | } 44 | } 45 | 46 | // ?. == Safe call --> only do the RHS if the reference is not null 47 | // let is a scope function that executes a block of code on the current object 48 | intent.getStringExtra(Intent.EXTRA_TEXT)?.let { name -> 49 | binding.welcomeText.text = String.format(getString(R.string.greeting), name) 50 | viewModel.insert(name) 51 | } 52 | } 53 | 54 | private fun deleteAllUsers() { 55 | viewModel.deleteAll() 56 | binding.welcomeText.text = getString(R.string.hello_world) 57 | } 58 | 59 | override fun onCreateOptionsMenu(menu: Menu?): Boolean { 60 | menuInflater.inflate(R.menu.main, menu) 61 | return true 62 | } 63 | 64 | override fun onOptionsItemSelected(item: MenuItem): Boolean { 65 | when (item.itemId) { 66 | R.id.update_astronauts -> getAstronauts() 67 | R.id.clear_database -> deleteAllUsers() 68 | R.id.stackoverflow -> goToPage() 69 | R.id.about -> Toast.makeText( 70 | this, 71 | "Hello Kotlin v2.0", 72 | Toast.LENGTH_SHORT 73 | ).show() 74 | else -> super.onOptionsItemSelected(item) 75 | } 76 | return true 77 | } 78 | 79 | private fun goToPage(site: String = "http://stackoverflow.com") = 80 | startActivity(Intent(Intent.ACTION_VIEW, site.toUri())) 81 | 82 | private fun getAstronauts() { 83 | viewModel.astroResult.observe(this) { result -> 84 | val astronauts = result.people.map { "${it.name} on the ${it.craft}" } 85 | binding.numPeopleText.text = String.format( 86 | getString(R.string.num_in_space), 87 | result.number 88 | ) 89 | binding.astronautNamesList.adapter = ArrayAdapter( 90 | this@WelcomeActivity, 91 | android.R.layout.simple_list_item_1, 92 | astronauts 93 | ) 94 | } 95 | } 96 | } 97 | -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/astro/AstroRequest.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.astro 2 | 3 | import com.google.gson.Gson 4 | import java.net.URL 5 | 6 | class AstroRequest { 7 | fun execute(): AstroResult = 8 | Gson().fromJson( 9 | URL("http://api.open-notify.org/astros.json").readText(), 10 | AstroResult::class.java 11 | ) 12 | } -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/astro/AstroResponseClasses.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.astro 2 | 3 | import kotlinx.serialization.Serializable 4 | 5 | @Serializable 6 | data class AstroResult( 7 | val message: String, 8 | val number: Int, 9 | val people: List 10 | ) 11 | 12 | @Serializable 13 | data class Assignment( 14 | val name: String, 15 | val craft: String, 16 | ) -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/astro/AstroService.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.astro 2 | 3 | import com.jakewharton.retrofit2.converter.kotlinx.serialization.asConverterFactory 4 | import kotlinx.serialization.ExperimentalSerializationApi 5 | import kotlinx.serialization.json.Json 6 | import okhttp3.MediaType.Companion.toMediaType 7 | import retrofit2.Retrofit 8 | import retrofit2.http.GET 9 | 10 | private const val BASE_URL = "http://api.open-notify.org/" 11 | 12 | @OptIn(ExperimentalSerializationApi::class) 13 | private val retrofit = Retrofit.Builder() 14 | //.addConverterFactory(GsonConverterFactory.create()) 15 | .addConverterFactory(Json.asConverterFactory("application/json".toMediaType())) 16 | .baseUrl(BASE_URL) 17 | .build() 18 | 19 | interface AstroService { 20 | @GET("astros.json") 21 | suspend fun getAstroResult(): AstroResult 22 | } 23 | 24 | object AstroApi { 25 | // property delegate called "lazy" 26 | val retrofitService: AstroService by lazy { 27 | retrofit.create(AstroService::class.java) 28 | } 29 | } -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/db/User.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.db 2 | 3 | import androidx.room.* 4 | 5 | @Entity(tableName = "users") 6 | data class User( 7 | @ColumnInfo(name = "name") 8 | val name: String, 9 | 10 | @PrimaryKey(autoGenerate = true) // last, so can omit it when instantiating 11 | var _id: Long = 0L 12 | ) -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/db/UserDAO.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.db 2 | 3 | import androidx.room.* 4 | import kotlinx.coroutines.flow.Flow 5 | 6 | @Dao 7 | interface UserDAO { 8 | @Query("select * from users order by name asc") 9 | fun getAllUsers(): Flow> 10 | 11 | @Query("select * from users where _id = :key") 12 | fun get(key: Long): User? 13 | 14 | @Query("select count(*) from users where name = :name") 15 | suspend fun count(name: String): Int 16 | 17 | @Query("select * from users where name = :name") 18 | fun findByName(name: String): List 19 | 20 | @Insert(onConflict = OnConflictStrategy.IGNORE) 21 | suspend fun insertUsers(vararg users: User) 22 | 23 | @Update 24 | suspend fun update(user: User) 25 | 26 | @Delete 27 | suspend fun delete(user: User) 28 | 29 | @Delete 30 | suspend fun deleteAll(vararg users: User) 31 | } -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/db/UserDatabase.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.db 2 | 3 | import android.content.Context 4 | import androidx.room.Database 5 | import androidx.room.Room 6 | import androidx.room.RoomDatabase 7 | 8 | @Database(entities = [User::class], version = 1, exportSchema = false) 9 | abstract class UserDatabase : RoomDatabase() { 10 | abstract val userDao: UserDAO 11 | 12 | companion object { 13 | @Volatile 14 | private var instance: UserDatabase? = null 15 | 16 | fun getInstance(context: Context): UserDatabase { 17 | return instance ?: synchronized(this) { 18 | instance ?: buildDatabase(context) 19 | .also { instance = it } 20 | } 21 | } 22 | 23 | private fun buildDatabase(context: Context) = 24 | Room.databaseBuilder( 25 | context.applicationContext, 26 | UserDatabase::class.java, 27 | "user_database") 28 | .fallbackToDestructiveMigration() 29 | .build() 30 | } 31 | } -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/db/UserRepository.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.db 2 | 3 | import androidx.annotation.WorkerThread 4 | import kotlinx.coroutines.flow.Flow 5 | 6 | class UserRepository(private val userDao: UserDAO) { 7 | val allUsers: Flow> = userDao.getAllUsers() 8 | 9 | @WorkerThread 10 | suspend fun insertUser(name: String) { 11 | if (userDao.count(name) == 0) { 12 | userDao.insertUsers(User(name)) 13 | } 14 | } 15 | 16 | suspend fun deleteUsersByName(name: String) = 17 | userDao.findByName(name).forEach { userDao.delete(it) } 18 | 19 | suspend fun deleteAllUsers() = 20 | userDao.deleteAll() 21 | } -------------------------------------------------------------------------------- /app/src/main/java/com/oreilly/hellokotlin/ui/WelcomeViewModel.kt: -------------------------------------------------------------------------------- 1 | package com.oreilly.hellokotlin.ui 2 | 3 | import androidx.lifecycle.* 4 | import com.oreilly.hellokotlin.astro.AstroApi 5 | import com.oreilly.hellokotlin.astro.AstroResult 6 | import com.oreilly.hellokotlin.db.User 7 | import com.oreilly.hellokotlin.db.UserRepository 8 | import kotlinx.coroutines.launch 9 | 10 | class WelcomeViewModel(private val repository: UserRepository) : ViewModel() { 11 | val astroResult: LiveData = liveData { 12 | val result = AstroApi.retrofitService.getAstroResult() 13 | emit(result) 14 | } 15 | 16 | val allUsers: LiveData> = repository.allUsers.asLiveData() 17 | 18 | fun insert(name: String) = viewModelScope.launch { 19 | repository.insertUser(name) 20 | } 21 | 22 | fun delete(name: String) = viewModelScope.launch { 23 | repository.deleteUsersByName(name) 24 | } 25 | 26 | fun deleteAll() = viewModelScope.launch { 27 | repository.deleteAllUsers() 28 | } 29 | } 30 | 31 | @Suppress("UNCHECKED_CAST") 32 | class WelcomeViewModelFactory(private val repository: UserRepository): ViewModelProvider.Factory { 33 | override fun create(modelClass: Class): T { 34 | if (modelClass.isAssignableFrom(WelcomeViewModel::class.java)) { 35 | return WelcomeViewModel(repository) as T 36 | } 37 | throw IllegalArgumentException("Unknown ViewModel class") 38 | } 39 | } -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 9 | 10 | 17 | 24 | 25 |