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Room Example added
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‎RoomAndroidExample/.gitignore‎

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*.iml
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.gradle
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/local.properties
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/.idea/caches
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/.idea/libraries
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/.idea/modules.xml
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/.idea/workspace.xml
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/.idea/navEditor.xml
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/.idea/assetWizardSettings.xml
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.DS_Store
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/build
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/captures
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.externalNativeBuild

‎RoomAndroidExample/app/.gitignore‎

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/build

‎RoomAndroidExample/app/build.gradle‎

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apply plugin: 'com.android.application'
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apply plugin: 'kotlin-android'
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apply plugin: 'kotlin-android-extensions'
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apply plugin: 'kotlin-kapt'
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android {
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compileSdkVersion 28
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defaultConfig {
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applicationId "com.example.roomandroidexample"
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minSdkVersion 21
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targetSdkVersion 28
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versionCode 1
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versionName "1.0"
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
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}
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buildTypes {
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release {
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minifyEnabled false
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proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
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}
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}
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}
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dependencies {
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implementation fileTree(dir: 'libs', include: ['*.jar'])
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implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
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implementation 'androidx.appcompat:appcompat:1.0.2'
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implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
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testImplementation 'junit:junit:4.12'
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androidTestImplementation 'androidx.test:runner:1.1.1'
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androidTestImplementation 'androidx.test.espresso:espresso-core:3.1.1'
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kapt 'androidx.room:room-compiler:2.0.0'
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implementation "android.arch.persistence.room:runtime:1.0.0"
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implementation 'androidx.recyclerview:recyclerview:1.0.0'
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implementation 'androidx.cardview:cardview:1.0.0'
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implementation 'com.google.code.gson:gson:2.8.5'
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implementation 'com.google.android.material:material:1.0.0'
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}

‎RoomAndroidExample/app/proguard-rules.pro‎

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# Add project specific ProGuard rules here.
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# You can control the set of applied configuration files using the
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# proguardFiles setting in build.gradle.
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#
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# For more details, see
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# http://developer.android.com/guide/developing/tools/proguard.html
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# If your project uses WebView with JS, uncomment the following
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# and specify the fully qualified class name to the JavaScript interface
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# class:
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#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
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# public *;
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#}
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# Uncomment this to preserve the line number information for
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# debugging stack traces.
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#-keepattributes SourceFile,LineNumberTable
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# If you keep the line number information, uncomment this to
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# hide the original source file name.
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#-renamesourcefileattribute SourceFile

‎RoomAndroidExample/app/src/androidTest/java/com/example/roomandroidexample/ExampleInstrumentedTest.kt‎

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package com.example.roomandroidexample
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import androidx.test.InstrumentationRegistry
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import androidx.test.runner.AndroidJUnit4
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import org.junit.Test
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import org.junit.runner.RunWith
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import org.junit.Assert.*
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/**
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* Instrumented test, which will execute on an Android device.
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*
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* See [testing documentation](http://d.android.com/tools/testing).
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*/
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@RunWith(AndroidJUnit4::class)
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class ExampleInstrumentedTest {
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@Test
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fun useAppContext() {
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// Context of the app under test.
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val appContext = InstrumentationRegistry.getTargetContext()
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assertEquals("com.example.roomandroidexample", appContext.packageName)
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}
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}

‎RoomAndroidExample/app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:tools="http://schemas.android.com/tools"
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package="com.example.roomandroidexample">
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<application
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android:allowBackup="true"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:roundIcon="@mipmap/ic_launcher_round"
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android:supportsRtl="true"
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android:theme="@style/AppTheme">
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<activity android:name=".MainActivity">
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<intent-filter>
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<action android:name="android.intent.action.MAIN"/>
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<category android:name="android.intent.category.LAUNCHER"/>
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</intent-filter>
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</activity>
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<activity android:name=".AddUserActivity"/>
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</application>
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</manifest>

‎RoomAndroidExample/app/src/main/java/com/example/roomandroidexample/AddUserActivity.kt‎

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package com.example.roomandroidexample
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import android.os.Bundle
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import androidx.appcompat.app.AppCompatActivity
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import android.widget.Toast
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import kotlinx.android.synthetic.main.activity_add_user.*
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class AddUserActivity : AppCompatActivity() {
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_add_user)
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val repo = UserRepository(this)
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button_save_user.setOnClickListener {
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if (ed_username.text.isNotEmpty() && ed_email.text.isNotEmpty() && ed_location.text.isNotEmpty()) {
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val user = Users(
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userName = ed_username.text.toString(),
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location = ed_location.text.toString(),
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email = ed_email.text.toString()
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)
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repo.insertUser(user)
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} else {
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Toast.makeText(this, "Invalid Input", Toast.LENGTH_SHORT).show()
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}
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finish()
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}
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}
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}

‎RoomAndroidExample/app/src/main/java/com/example/roomandroidexample/AppDatabase.kt‎

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package com.example.roomandroidexample
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import androidx.room.Database
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import androidx.room.Room
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import androidx.room.RoomDatabase
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import androidx.room.TypeConverters
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import android.content.Context
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@Database(entities = [Users::class], version = 1, exportSchema = false)
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@TypeConverters(Converters::class)
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abstract class AppDatabase : RoomDatabase() {
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abstract fun userDao() : UserDao
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companion object {
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private var INSTANCE: AppDatabase? = null
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fun getInstance(context: Context): AppDatabase? {
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if (INSTANCE == null) {
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synchronized(AppDatabase::class) {
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INSTANCE = Room.databaseBuilder(context.applicationContext,
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AppDatabase::class.java, "user.db").allowMainThreadQueries()
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.build()
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}
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}
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return INSTANCE
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}
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fun destroyInstance() {
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INSTANCE = null
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}
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}
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}

‎RoomAndroidExample/app/src/main/java/com/example/roomandroidexample/AppExecutors.kt‎

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package com.example.roomandroidexample
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import android.os.Handler
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import android.os.Looper
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import java.util.concurrent.Executor
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import java.util.concurrent.Executors
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/**
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* Global executor pools for the whole application.
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*
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*
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* Grouping tasks like this avoids the effects of task starvation (e.g. disk reads don't wait behind
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* webservice requests).
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*/
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class AppExecutors private constructor(
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private val diskIO: Executor,
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private val networkIO: Executor,
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private val mainThread: Executor
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) {
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fun diskIO(): Executor {
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return diskIO
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}
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fun mainThread(): Executor {
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return mainThread
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}
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fun networkIO(): Executor {
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return networkIO
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}
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private class MainThreadExecutor : Executor {
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private val mainThreadHandler = Handler(Looper.getMainLooper())
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override fun execute(command: Runnable) {
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mainThreadHandler.post(command)
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}
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}
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companion object {
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// For Singleton instantiation
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private val LOCK = Any()
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private var sInstance: AppExecutors? = null
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val instance: AppExecutors
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get() {
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if (sInstance == null) {
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synchronized(LOCK) {
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sInstance = AppExecutors(
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Executors.newSingleThreadExecutor(),
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Executors.newFixedThreadPool(3),
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MainThreadExecutor()
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)
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}
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}
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return sInstance!!
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}
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}
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}

‎RoomAndroidExample/app/src/main/java/com/example/roomandroidexample/Converters.kt‎

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package com.example.roomandroidexample
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import androidx.room.TypeConverter
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import com.google.gson.Gson
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import com.google.gson.reflect.TypeToken
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class Converters {
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@TypeConverter
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fun fromString(value: String): List<String> {
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val listType = object : TypeToken<List<String>>() {
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}.type
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return Gson().fromJson(value, listType)
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}
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@TypeConverter
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fun fromArrayList(list: List<String>): String {
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val gson = Gson()
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return gson.toJson(list)
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}
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}

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