Android Room Persistence library and Kotlin

Question

I am trying to write a simple app using Kotlin and Room Persistence Library. I followed the tutorial in the Android Persistence codelab.

Here is my AppDatabase<

Answer 1

Try out these steps

Step 1. Set the room_version in the project.gradle file

buildscript {
    ext.kotlin_version = '1.1.51'
    ext.room_version = '1.0.0-alpha9-1'
...

Step 2. Apply the kotlin-kapt plugin in the app.gradle file, and this solved my issue.

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
apply plugin: 'kotlin-kapt'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
...

Step 3. Add the kapt dependency in the app.gradle file

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation "android.arch.persistence.room:runtime:$room_version"
    annotationProcessor "android.arch.persistence.room:compiler:$room_version"
    kapt "android.arch.persistence.room:compiler:$room_version"
...
}