├── .gitignore ├── .idea ├── .name ├── codeStyles │ ├── Project.xml │ └── codeStyleConfig.xml ├── dictionaries ├── gradle.xml ├── jarRepositories.xml ├── misc.xml └── runConfigurations.xml ├── README.md ├── app ├── .gitignore ├── build.gradle ├── proguard-rules.pro └── src │ ├── androidTest │ └── java │ │ └── com │ │ └── example │ │ └── room │ │ └── mvvm │ │ └── ExampleInstrumentedTest.kt │ ├── main │ ├── AndroidManifest.xml │ ├── java │ │ └── com │ │ │ └── example │ │ │ └── room │ │ │ └── mvvm │ │ │ ├── model │ │ │ └── LoginTableModel.kt │ │ │ ├── repository │ │ │ └── LoginRepository.kt │ │ │ ├── room │ │ │ ├── DAOAccess.kt │ │ │ └── LoginDatabase.kt │ │ │ ├── view │ │ │ └── MainActivity.kt │ │ │ └── viewmodel │ │ │ └── LoginViewModel.kt │ └── res │ │ ├── drawable-v24 │ │ └── ic_launcher_foreground.xml │ │ ├── drawable │ │ └── ic_launcher_background.xml │ │ ├── layout │ │ └── activity_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 │ └── example │ └── room │ └── mvvm │ └── ExampleUnitTest.kt ├── build.gradle ├── gradle.properties ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat └── settings.gradle /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/caches 5 | /.idea/libraries 6 | /.idea/modules.xml 7 | /.idea/workspace.xml 8 | /.idea/navEditor.xml 9 | /.idea/assetWizardSettings.xml 10 | .DS_Store 11 | /build 12 | /captures 13 | .externalNativeBuild 14 | .cxx 15 | -------------------------------------------------------------------------------- /.idea/.name: -------------------------------------------------------------------------------- 1 | MVVM Room Kotlin Example -------------------------------------------------------------------------------- /.idea/codeStyles/Project.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 6 | 7 | 8 | 10 | 11 | 12 |
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115 | 116 | 117 | 118 | 119 | 121 | 122 | -------------------------------------------------------------------------------- /.idea/codeStyles/codeStyleConfig.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 5 | -------------------------------------------------------------------------------- /.idea/dictionaries: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 20 | 21 | -------------------------------------------------------------------------------- /.idea/jarRepositories.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 9 | 10 | 14 | 15 | 19 | 20 | 24 | 25 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 14 | -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Android’s Room in Kotlin ft. MVVM Architecture and Coroutines 2 | 3 | If you’re looking for an explanation on **Room** implementation on Android using Kotlin and one of it’s Coroutine feature with MVVM architecture, then this one is for you. 4 | 5 | Let’s see what I have in store for you. 6 | 7 | 1. What is Room, Kotlin, MVVM, Coroutines? 8 | 2. Advantages of Room over SQLite? 9 | 3. Important Annotation in Room. 10 | 4. Step-by-Step Simple Insert and Read Example 11 | 5. Conclusion 12 | 13 | So let’s get started. 14 | 15 | ## 1. What is Room, Kotlin, MVVM, Coroutines? 16 | 17 | **Answer:** Let's see what are the important concepts in ROOM and MVVM. 18 | 19 | **Room** 20 | **Room Database:** Database layer on top of SQLite database that takes care of mundane tasks that you used to handle with an SQLiteOpenHelper. Database holder that serves as an access point to the underlying SQLite database. The Room database uses the DAO to issue queries to the SQLite database. 21 | 22 | **Entity:** When working with Architecture Components, this is an annotated class that describes a database table. 23 | 24 | **SQLite database:** On the device, data is stored in an SQLite database. For simplicity, additional storage options, such as a web server, are omitted. The Room persistence library creates and maintains this database for you. 25 | 26 | **DAO:** Data access object. A mapping of SQL queries to functions. You used to have to define these painstakingly in your SQLiteOpenHelper class. When you use a DAO, you call the methods, and Room takes care of the rest. 27 | 28 | **Kotlin:** Kotlin is an open-source, statically-typed programming language that supports both object-oriented and functional programming. Kotlin provides similar syntax and concepts from other languages, including C#, Java, and Scala, among many others. Kotlin does not aim to be unique — instead, it draws inspiration from decades of language development. It exists in variants that target the JVM (Kotlin/JVM), JavaScript (Kotlin/JS), and native code (Kotlin/Native). 29 | 30 | **MVVM** 31 | **ViewModel:** Provides data to the UI. Acts as a communication center between the Repository and the UI. Hides where the data originates from the UI. ViewModel instances survive configuration changes. 32 | 33 | **LiveData:** A data holder class that can be observed. Always holds/caches latest version of data. Notifies its observers when the data has changed. LiveData is lifecycle aware. UI components just observe relevant data and don’t stop or resume observation. LiveData automatically manages all of this since it’s aware of the relevant lifecycle status changes while observing. 34 | 35 | **Repository:** A class that you create, for example using the WordRepository class. You use the Repository for managing multiple data sources. 36 | 37 | 38 | 39 | 40 | 41 | **Coroutines**: Coroutines are a great new feature of Kotlin which allow you to write asynchronous code in a sequential fashion. … However, like RxJava, coroutines have a number of little subtleties that you end up learning for yourself during development time, or tricks that you pick up from others. 42 | 43 | 44 | ## 2. Advantages of Room over SQLite? 45 | 46 | - In case of SQLite, There is no compile time verification of raw SQLite queries. But in Room there is SQL validation at compile time. 47 | 48 | - As your schema changes, you need to update the affected SQL queries manually. Room solves this problem. 49 | 50 | - You need to use lots of boilerplate code to convert between SQL queries and Java data objects. But, Room maps our database objects to Java Object without boilerplate code. 51 | 52 | - Room is built to work with LiveData and RxJava for data observation, while SQLite does not. 53 | 54 | 55 | ## 3. Important Annotations in Room. 56 | 57 | 58 | 59 | 60 | 61 | ## 4. Implementation Step-by-Step? 62 | As said before, this example uses MVVM with Room using Kotlin and Coroutines. Let's dive into the steps of doing it. 63 | 64 | ### **Step1:** Add dependencies to your project: 65 | 66 | ```xml 67 | dependencies { 68 | ... 69 | ... 70 | // - - Room Persistence Library 71 | def room_version = "2.2.5" 72 | implementation "androidx.room:room-runtime:$room_version" 73 | kapt "androidx.room:room-compiler:$room_version" 74 | 75 | // optional - Kotlin Extensions and Coroutines support for Room 76 | implementation "androidx.room:room-ktx:$room_version" 77 | 78 | // - - ViewModel and LiveData 79 | def lifecycle_version = "2.2.0" 80 | implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version" 81 | implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version" 82 | 83 | // - - Kotlin Coroutines 84 | def coroutines_version = "1.3.7" 85 | implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version" 86 | implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version" 87 | ... 88 | ... 89 | } 90 | ``` 91 | 92 | 93 | ### **Step2:** Create different folders that relate to MVVM: 94 | 95 | 96 | 97 | 98 | 99 | ### **Step3:** Design your MainActivity which should look like this: 100 | 101 | ```xml 102 | 103 | 110 | 111 | 117 | 118 | 125 | 126 | 134 | 135 | 147 | 148 | 161 | 162 | 175 | 176 | 187 | 188 | 203 | 204 | 205 | 206 | 213 | 214 | 226 | 227 | 242 | 243 | 258 | 259 | 271 | 272 | 287 | 288 | 289 | 290 | 291 | ``` 292 | 293 | ### **Step4:** Now let's create the Room Database INSTANCE: 294 | 295 | **LoginDatabase.kt** 296 | 297 | ```kotlin 298 | package com.example.room.mvvm.room 299 | 300 | import android.content.Context 301 | import androidx.room.* 302 | import com.example.room.mvvm.model.LoginTableModel 303 | 304 | @Database(entities = arrayOf(LoginTableModel::class), version = 1, exportSchema = false) 305 | abstract class LoginDatabase : RoomDatabase() { 306 | 307 | abstract fun loginDao() : DAOAccess 308 | 309 | companion object { 310 | 311 | @Volatile 312 | private var INSTANCE: LoginDatabase? = null 313 | 314 | fun getDataseClient(context: Context) : LoginDatabase { 315 | 316 | if (INSTANCE != null) return INSTANCE!! 317 | 318 | synchronized(this) { 319 | 320 | INSTANCE = Room 321 | .databaseBuilder(context, LoginDatabase::class.java, "LOGIN_DATABASE") 322 | .fallbackToDestructiveMigration() 323 | .build() 324 | 325 | return INSTANCE!! 326 | 327 | } 328 | } 329 | 330 | } 331 | 332 | } 333 | ``` 334 | 335 | ### **Step5:** Next, let's create a class for creating a Table for Room DB: 336 | 337 | ```kotlin 338 | package com.example.room.mvvm.model 339 | 340 | import androidx.room.ColumnInfo 341 | import androidx.room.Entity 342 | import androidx.room.PrimaryKey 343 | 344 | @Entity(tableName = "Login") 345 | data class LoginTableModel ( 346 | 347 | @ColumnInfo(name = "username") 348 | var Username: String, 349 | 350 | @ColumnInfo(name = "password") 351 | var Password: String 352 | 353 | ) { 354 | 355 | @PrimaryKey(autoGenerate = true) 356 | @ColumnInfo(name = "id") 357 | var Id: Int? = null 358 | 359 | } 360 | ``` 361 | 362 | ### **Step6:** Next is to create the queries using DAO Interface: 363 | 364 | ```kotlin 365 | package com.example.room.mvvm.room 366 | 367 | import androidx.lifecycle.LiveData 368 | import androidx.lifecycle.MutableLiveData 369 | import androidx.room.Dao 370 | import androidx.room.Insert 371 | import androidx.room.OnConflictStrategy 372 | import androidx.room.Query 373 | import com.example.room.mvvm.model.LoginTableModel 374 | 375 | @Dao 376 | interface DAOAccess { 377 | 378 | @Insert(onConflict = OnConflictStrategy.REPLACE) 379 | suspend fun InsertData(loginTableModel: LoginTableModel) 380 | 381 | @Query("SELECT * FROM Login WHERE Username =:username") 382 | fun getLoginDetails(username: String?) : LiveData 383 | 384 | } 385 | ``` 386 | 387 | ### **Step7:** Next we create the Repository Class: 388 | 389 | ```kotlin 390 | package com.example.room.mvvm.repository 391 | 392 | import android.content.Context 393 | import androidx.lifecycle.LiveData 394 | import com.example.room.mvvm.model.LoginTableModel 395 | import com.example.room.mvvm.room.LoginDatabase 396 | import kotlinx.coroutines.CoroutineScope 397 | import kotlinx.coroutines.Dispatchers.IO 398 | import kotlinx.coroutines.launch 399 | 400 | class LoginRepository { 401 | 402 | companion object { 403 | 404 | var loginDatabase: LoginDatabase? = null 405 | 406 | var loginTableModel: LiveData? = null 407 | 408 | fun initializeDB(context: Context) : LoginDatabase { 409 | return LoginDatabase.getDataseClient(context) 410 | } 411 | 412 | fun insertData(context: Context, username: String, password: String) { 413 | 414 | loginDatabase = initializeDB(context) 415 | 416 | CoroutineScope(IO).launch { 417 | val loginDetails = LoginTableModel(username, password) 418 | loginDatabase!!.loginDao().InsertData(loginDetails) 419 | } 420 | 421 | } 422 | 423 | fun getLoginDetails(context: Context, username: String) : LiveData? { 424 | 425 | loginDatabase = initializeDB(context) 426 | 427 | loginTableModel = loginDatabase!!.loginDao().getLoginDetails(username) 428 | 429 | return loginTableModel 430 | } 431 | 432 | } 433 | } 434 | ``` 435 | 436 | ### **Step8:** Next and very important step is to have a ViewModel in the project: 437 | 438 | ```kotlin 439 | package com.example.room.mvvm.viewmodel 440 | 441 | import android.content.Context 442 | import androidx.lifecycle.LiveData 443 | import androidx.lifecycle.ViewModel 444 | import com.example.room.mvvm.model.LoginTableModel 445 | import com.example.room.mvvm.repository.LoginRepository 446 | 447 | class LoginViewModel : ViewModel() { 448 | 449 | var liveDataLogin: LiveData? = null 450 | 451 | fun insertData(context: Context, username: String, password: String) { 452 | LoginRepository.insertData(context, username, password) 453 | } 454 | 455 | fun getLoginDetails(context: Context, username: String) : LiveData? { 456 | liveDataLogin = LoginRepository.getLoginDetails(context, username) 457 | return liveDataLogin 458 | } 459 | 460 | } 461 | ``` 462 | 463 | ### **Step9:** Finally, we code the MainActivity kotlin file: 464 | 465 | ```kotlin 466 | package com.example.room.mvvm.view 467 | 468 | import android.content.Context 469 | import androidx.appcompat.app.AppCompatActivity 470 | import android.os.Bundle 471 | import android.widget.Toast 472 | import androidx.lifecycle.Observer 473 | import androidx.lifecycle.ViewModelProvider 474 | import com.example.room.mvvm.R 475 | import com.example.room.mvvm.viewmodel.LoginViewModel 476 | import kotlinx.android.synthetic.main.activity_main.* 477 | 478 | class MainActivity : AppCompatActivity() { 479 | 480 | lateinit var loginViewModel: LoginViewModel 481 | 482 | lateinit var context: Context 483 | 484 | lateinit var strUsername: String 485 | lateinit var strPassword: String 486 | 487 | override fun onCreate(savedInstanceState: Bundle?) { 488 | super.onCreate(savedInstanceState) 489 | setContentView(R.layout.activity_main) 490 | 491 | context = this@MainActivity 492 | 493 | loginViewModel = ViewModelProvider(this).get(LoginViewModel::class.java) 494 | 495 | btnAddLogin.setOnClickListener { 496 | 497 | strUsername = txtUsername.text.toString().trim() 498 | strPassword = txtPassword.text.toString().trim() 499 | 500 | if (strPassword.isEmpty()) { 501 | txtUsername.error = "Please enter the username" 502 | } 503 | else if (strPassword.isEmpty()) { 504 | txtPassword.error = "Please enter the username" 505 | } 506 | else { 507 | loginViewModel.insertData(context, strUsername, strPassword) 508 | lblInsertResponse.text = "Inserted Successfully" 509 | } 510 | } 511 | 512 | btnReadLogin.setOnClickListener { 513 | 514 | strUsername = txtUsername.text.toString().trim() 515 | 516 | loginViewModel.getLoginDetails(context, strUsername)!!.observe(this, Observer { 517 | 518 | if (it == null) { 519 | lblReadResponse.text = "Data Not Found" 520 | lblUseraname.text = "- - -" 521 | lblPassword.text = "- - -" 522 | } 523 | else { 524 | lblUseraname.text = it.Username 525 | lblPassword.text = it.Password 526 | 527 | lblReadResponse.text = "Data Found Successfully" 528 | } 529 | }) 530 | } 531 | } 532 | } 533 | ``` 534 | 535 | For any clarifications please refer to the repository. 536 | 537 | ## **Conclusion** 538 | 539 | Hopefully this guide introduced you to a lesser known yet useful form of Android application data storage called ROOM with Kotlin and MVVM. 540 | 541 | I hope it will help you too. 542 | -------------------------------------------------------------------------------- /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | apply plugin: 'kotlin-android' 3 | apply plugin: 'kotlin-android-extensions' 4 | apply plugin: 'kotlin-kapt' 5 | 6 | android { 7 | compileSdkVersion 29 8 | 9 | defaultConfig { 10 | applicationId "com.example.room.mvvm" 11 | minSdkVersion 21 12 | targetSdkVersion 29 13 | versionCode 1 14 | versionName "1.0" 15 | 16 | testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" 17 | } 18 | 19 | buildTypes { 20 | release { 21 | minifyEnabled false 22 | proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' 23 | } 24 | } 25 | 26 | compileOptions { 27 | sourceCompatibility JavaVersion.VERSION_1_8 28 | targetCompatibility JavaVersion.VERSION_1_8 29 | } 30 | 31 | kotlinOptions { 32 | jvmTarget = JavaVersion.VERSION_1_8.toString() 33 | } 34 | } 35 | 36 | dependencies { 37 | 38 | implementation fileTree(dir: "libs", include: ["*.jar"]) 39 | implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" 40 | implementation 'androidx.core:core-ktx:1.3.0' 41 | implementation 'androidx.appcompat:appcompat:1.1.0' 42 | implementation 'androidx.constraintlayout:constraintlayout:1.1.3' 43 | testImplementation 'junit:junit:4.12' 44 | androidTestImplementation 'androidx.test.ext:junit:1.1.1' 45 | androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0' 46 | 47 | 48 | // - - Room Persistence Library 49 | def room_version = "2.2.5" 50 | 51 | implementation "androidx.room:room-runtime:$room_version" 52 | kapt "androidx.room:room-compiler:$room_version" 53 | // optional - Kotlin Extensions and Coroutines support for Room 54 | implementation "androidx.room:room-ktx:$room_version" 55 | 56 | // - - ViewModel and LiveData 57 | def lifecycle_version = "2.2.0" 58 | 59 | implementation "androidx.lifecycle:lifecycle-viewmodel-ktx:$lifecycle_version" 60 | implementation "androidx.lifecycle:lifecycle-livedata-ktx:$lifecycle_version" 61 | 62 | // - - Kotlin Coroutines 63 | def coroutines_version = "1.3.7" 64 | 65 | implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version" 66 | implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version" 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 -------------------------------------------------------------------------------- /app/src/androidTest/java/com/example/room/mvvm/ExampleInstrumentedTest.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm 2 | 3 | import androidx.test.platform.app.InstrumentationRegistry 4 | import androidx.test.ext.junit.runners.AndroidJUnit4 5 | 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 = InstrumentationRegistry.getInstrumentation().targetContext 22 | assertEquals("com.example.room.mvvm", appContext.packageName) 23 | } 24 | } -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /app/src/main/java/com/example/room/mvvm/model/LoginTableModel.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm.model 2 | 3 | import androidx.room.ColumnInfo 4 | import androidx.room.Entity 5 | import androidx.room.PrimaryKey 6 | 7 | @Entity(tableName = "Login") 8 | data class LoginTableModel ( 9 | 10 | @ColumnInfo(name = "username") 11 | var Username: String, 12 | 13 | @ColumnInfo(name = "password") 14 | var Password: String 15 | 16 | ) { 17 | 18 | @PrimaryKey(autoGenerate = true) 19 | @ColumnInfo(name = "id") 20 | var Id: Int? = null 21 | 22 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/room/mvvm/repository/LoginRepository.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm.repository 2 | 3 | import android.content.Context 4 | import androidx.lifecycle.LiveData 5 | import androidx.lifecycle.MutableLiveData 6 | import com.example.room.mvvm.model.LoginTableModel 7 | import com.example.room.mvvm.room.LoginDatabase 8 | import kotlinx.coroutines.CoroutineScope 9 | import kotlinx.coroutines.Dispatchers.IO 10 | import kotlinx.coroutines.Dispatchers.Main 11 | import kotlinx.coroutines.launch 12 | import kotlinx.coroutines.withContext 13 | 14 | class LoginRepository { 15 | 16 | companion object { 17 | 18 | var loginDatabase: LoginDatabase? = null 19 | 20 | var loginTableModel: LiveData? = null 21 | 22 | fun initializeDB(context: Context) : LoginDatabase { 23 | return LoginDatabase.getDataseClient(context) 24 | } 25 | 26 | fun insertData(context: Context, username: String, password: String) { 27 | 28 | loginDatabase = initializeDB(context) 29 | 30 | CoroutineScope(IO).launch { 31 | val loginDetails = LoginTableModel(username, password) 32 | loginDatabase!!.loginDao().InsertData(loginDetails) 33 | } 34 | 35 | } 36 | 37 | fun getLoginDetails(context: Context, username: String) : LiveData? { 38 | 39 | loginDatabase = initializeDB(context) 40 | 41 | loginTableModel = loginDatabase!!.loginDao().getLoginDetails(username) 42 | 43 | return loginTableModel 44 | } 45 | 46 | } 47 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/room/mvvm/room/DAOAccess.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm.room 2 | 3 | import androidx.lifecycle.LiveData 4 | import androidx.lifecycle.MutableLiveData 5 | import androidx.room.Dao 6 | import androidx.room.Insert 7 | import androidx.room.OnConflictStrategy 8 | import androidx.room.Query 9 | import com.example.room.mvvm.model.LoginTableModel 10 | 11 | @Dao 12 | interface DAOAccess { 13 | 14 | @Insert(onConflict = OnConflictStrategy.REPLACE) 15 | suspend fun InsertData(loginTableModel: LoginTableModel) 16 | 17 | @Query("SELECT * FROM Login WHERE Username =:username") 18 | fun getLoginDetails(username: String?) : LiveData 19 | 20 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/room/mvvm/room/LoginDatabase.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm.room 2 | 3 | import android.content.Context 4 | import androidx.room.* 5 | import com.example.room.mvvm.model.LoginTableModel 6 | 7 | @Database(entities = arrayOf(LoginTableModel::class), version = 1, exportSchema = false) 8 | abstract class LoginDatabase : RoomDatabase() { 9 | 10 | abstract fun loginDao() : DAOAccess 11 | 12 | companion object { 13 | 14 | @Volatile 15 | private var INSTANCE: LoginDatabase? = null 16 | 17 | fun getDataseClient(context: Context) : LoginDatabase { 18 | 19 | if (INSTANCE != null) return INSTANCE!! 20 | 21 | synchronized(this) { 22 | 23 | INSTANCE = Room 24 | .databaseBuilder(context, LoginDatabase::class.java, "LOGIN_DATABASE") 25 | .fallbackToDestructiveMigration() 26 | .build() 27 | 28 | return INSTANCE!! 29 | 30 | } 31 | } 32 | 33 | } 34 | 35 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/room/mvvm/view/MainActivity.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm.view 2 | 3 | import android.content.Context 4 | import androidx.appcompat.app.AppCompatActivity 5 | import android.os.Bundle 6 | import android.widget.Toast 7 | import androidx.lifecycle.Observer 8 | import androidx.lifecycle.ViewModelProvider 9 | import com.example.room.mvvm.R 10 | import com.example.room.mvvm.viewmodel.LoginViewModel 11 | import kotlinx.android.synthetic.main.activity_main.* 12 | 13 | class MainActivity : AppCompatActivity() { 14 | 15 | lateinit var loginViewModel: LoginViewModel 16 | 17 | lateinit var context: Context 18 | 19 | lateinit var strUsername: String 20 | lateinit var strPassword: String 21 | 22 | override fun onCreate(savedInstanceState: Bundle?) { 23 | super.onCreate(savedInstanceState) 24 | setContentView(R.layout.activity_main) 25 | 26 | context = this@MainActivity 27 | 28 | loginViewModel = ViewModelProvider(this).get(LoginViewModel::class.java) 29 | 30 | btnAddLogin.setOnClickListener { 31 | 32 | strUsername = txtUsername.text.toString().trim() 33 | strPassword = txtPassword.text.toString().trim() 34 | 35 | if (strPassword.isEmpty()) { 36 | txtUsername.error = "Please enter the username" 37 | } 38 | else if (strPassword.isEmpty()) { 39 | txtPassword.error = "Please enter the username" 40 | } 41 | else { 42 | loginViewModel.insertData(context, strUsername, strPassword) 43 | lblInsertResponse.text = "Inserted Successfully" 44 | } 45 | } 46 | 47 | btnReadLogin.setOnClickListener { 48 | 49 | strUsername = txtUsername.text.toString().trim() 50 | 51 | loginViewModel.getLoginDetails(context, strUsername)!!.observe(this, Observer { 52 | 53 | if (it == null) { 54 | lblReadResponse.text = "Data Not Found" 55 | lblUseraname.text = "- - -" 56 | lblPassword.text = "- - -" 57 | } 58 | else { 59 | lblUseraname.text = it.Username 60 | lblPassword.text = it.Password 61 | 62 | lblReadResponse.text = "Data Found Successfully" 63 | } 64 | }) 65 | } 66 | } 67 | } -------------------------------------------------------------------------------- /app/src/main/java/com/example/room/mvvm/viewmodel/LoginViewModel.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm.viewmodel 2 | 3 | import android.content.Context 4 | import androidx.lifecycle.LiveData 5 | import androidx.lifecycle.MutableLiveData 6 | import androidx.lifecycle.ViewModel 7 | import com.example.room.mvvm.model.LoginTableModel 8 | import com.example.room.mvvm.repository.LoginRepository 9 | 10 | class LoginViewModel : ViewModel() { 11 | 12 | var liveDataLogin: LiveData? = null 13 | 14 | fun insertData(context: Context, username: String, password: String) { 15 | LoginRepository.insertData(context, username, password) 16 | } 17 | 18 | fun getLoginDetails(context: Context, username: String) : LiveData? { 19 | liveDataLogin = LoginRepository.getLoginDetails(context, username) 20 | return liveDataLogin 21 | } 22 | 23 | } -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 8 | 9 | 15 | 18 | 21 | 22 | 23 | 24 | 30 | -------------------------------------------------------------------------------- /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 | 16 | 17 | 24 | 25 | 33 | 34 | 46 | 47 | 60 | 61 | 74 | 75 | 86 | 87 | 102 | 103 | 104 | 105 | 112 | 113 | 125 | 126 | 141 | 142 | 157 | 158 | 170 | 171 | 186 | 187 | 188 | 189 | 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| 10 | -------------------------------------------------------------------------------- /app/src/test/java/com/example/room/mvvm/ExampleUnitTest.kt: -------------------------------------------------------------------------------- 1 | package com.example.room.mvvm 2 | 3 | import org.junit.Test 4 | 5 | import org.junit.Assert.* 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * See [testing documentation](http://d.android.com/tools/testing). 11 | */ 12 | class ExampleUnitTest { 13 | @Test 14 | fun addition_isCorrect() { 15 | assertEquals(4, 2 + 2) 16 | } 17 | } -------------------------------------------------------------------------------- /build.gradle: -------------------------------------------------------------------------------- 1 | // Top-level build file where you can add configuration options common to all sub-projects/modules. 2 | buildscript { 3 | ext.kotlin_version = "1.3.72" 4 | repositories { 5 | google() 6 | jcenter() 7 | } 8 | dependencies { 9 | classpath "com.android.tools.build:gradle:4.0.0" 10 | classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" 11 | 12 | // NOTE: Do not place your application dependencies here; they belong 13 | // in the individual module build.gradle files 14 | } 15 | } 16 | 17 | allprojects { 18 | repositories { 19 | google() 20 | jcenter() 21 | } 22 | } 23 | 24 | task clean(type: Delete) { 25 | delete rootProject.buildDir 26 | } -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | # IDE (e.g. Android Studio) users: 3 | # Gradle settings configured through the IDE *will override* 4 | # any settings specified in this file. 5 | # For more details on how to configure your build environment visit 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html 7 | # Specifies the JVM arguments used for the daemon process. 8 | # The setting is particularly useful for tweaking memory settings. 9 | org.gradle.jvmargs=-Xmx2048m 10 | # When configured, Gradle will run in incubating parallel mode. 11 | # This option should only be used with decoupled projects. More details, visit 12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 13 | # org.gradle.parallel=true 14 | # AndroidX package structure to make it clearer which packages are bundled with the 15 | # Android operating system, and which are packaged with your app"s APK 16 | # https://developer.android.com/topic/libraries/support-library/androidx-rn 17 | android.useAndroidX=true 18 | # Automatically convert third-party libraries to use AndroidX 19 | android.enableJetifier=true 20 | # Kotlin code style for this project: "official" or "obsolete": 21 | kotlin.code.style=official -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/umangburman/MVVM-Room-Kotlin-Example/e85d2df6b1b351085d5e312de37e7cbab8e3cf6b/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Sun Jun 07 18:34:33 IST 2020 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-6.1.1-all.zip 7 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn () { 37 | echo "$*" 38 | } 39 | 40 | die () { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save () { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | rootProject.name = "MVVM Room Kotlin Example" --------------------------------------------------------------------------------