app.gradle

dependencies {
    --- 
    // Room components
    implementation 'android.arch.persistence.room:runtime:1.1.1'
    annotationProcessor 'android.arch.persistence.room:compiler:1.1.1'
    
    // Lifecycle components
    implementation 'android.arch.lifecycle:extensions:1.1.1'
    annotationProcessor 'android.arch.lifecycle:compiler:1.1.1'
}