title: Android Studio unresolved reference. Project compiles
body: <p>After upgrading Android Studio, a project with no issues started showing issues in the editor. I have lots of <code>Unresolved Reference</code> errors. Anything under the support libraries (support-v4, support-v7). </p>
  
  <p><a href="https://i.stack.imgur.com/WQna0.png" rel="noreferrer"><img src="https://i.stack.imgur.com/WQna0.png" alt="enter image description here"></a></p>
  
  <p>In the screen capture above, anything showing in red isn't resolving and showing as an error.
  I am also using Lifecycle components and Room database. They seem to have issues as well. Looks like interfaces can be found but classes can't. </p>
  
  <p>For example, in one of my classes using <code>Room</code>, </p>
  
  <p><code>android.arch.persistence.room.Database</code> and <code>android.arch.persistence.room.TypeConverters</code> resolve correctly, but </p>
  
  <p><code>android.arch.persistence.room.Room</code> and <code>android.arch.persistence.room.RoomDatabase</code> do not.</p>
  
  <p><a href="https://i.stack.imgur.com/pbebh.png" rel="noreferrer"><img src="https://i.stack.imgur.com/pbebh.png" alt="enter image description here"></a></p>
  
  <p>Note: The project builds and runs fine on Android emulators and devices without any issues. It builds and runs using the build button on Android Studio without any errors. I'm not getting any Class not found errors. This is just an issue inside the Android Studio editor. I have already restarted Android Studio, cleaned and rebuilt the project.</p>
  
  <p>Here's my project build file:</p>
  
  <pre><code>buildscript {
    ext.kotlin_version = '1.2.70'
    ext.serialization_version = '0.6.2'
    ext.gradle_plugin_version = '3.2.0'
  
    repositories {
      google()
      jcenter()
      maven { url "https://jitpack.io" }
      maven { url "https://kotlin.bintray.com/kotlinx" }
    }
    dependencies {
      classpath "com.android.tools.build:gradle:3.2.1"
      classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
      classpath "org.jetbrains.kotlinx:kotlinx-gradle-serialization-plugin:$serialization_version"
    }
  }
  
  allprojects {
    repositories {
      google()
      jcenter()
      maven { url 'https://jitpack.io' }
      maven { url "https://kotlin.bintray.com/kotlinx" }
    }
  }
  
  task clean(type: Delete) {
    delete rootProject.buildDir
  }
  
  ext {
    roomVersion = '1.1.1'
    archLifecycleVersion = '1.1.1'
    buildToolsVersion = '28.0.3'
    supportLibVersion = '28.0.0'
  }
  </code></pre>
  
  <p>And module build file:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  apply plugin: 'kotlin-android'
  apply plugin: 'kotlin-android-extensions'
  apply plugin: 'kotlin-kapt'
  apply plugin: 'kotlinx-serialization'
  
  android {
    compileSdkVersion 28
  
    defaultConfig {
      applicationId "com.example.project"
      minSdkVersion 19
      targetSdkVersion 28
      versionCode 1
      versionName "1.0"
      testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      vectorDrawables.useSupportLibrary = true
      multiDexEnabled true
      kapt {
          arguments {
              arg("room.schemaLocation", "$projectDir/schemas".toString())
          }
      }
  }
  buildTypes {
      release {
          minifyEnabled false
          proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
      }
  }
  flavorDimensions 'version'
  productFlavors {
      live {
          dimension 'version'
      }
      dev {
          dimension 'version'
          versionNameSuffix '-dev'
      }
  }
  buildToolsVersion "$rootProject.buildToolsVersion"
  compileOptions {
      sourceCompatibility JavaVersion.VERSION_1_8
      targetCompatibility JavaVersion.VERSION_1_8
  }
  dataBinding {
      enabled = true
    }
  }
  
  kotlin {
    experimental {
      coroutines 'enable'
    }
  }
  
  
  
  dependencies {
  implementation "com.android.support:multidex:1.0.3"
  implementation fileTree(include: ['*.jar'], dir: 'libs')
  implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:$kotlin_version"
  implementation "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
  implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime:$serialization_version"
  
  // Support and google services
  implementation "com.android.support:support-compat:$rootProject.supportLibVersion"
  implementation "com.android.support:support-core-utils:$rootProject.supportLibVersion"
  implementation "com.android.support:support-core-ui:$rootProject.supportLibVersion"
  implementation "com.android.support:support-media-compat:$rootProject.supportLibVersion"
  implementation "com.android.support:support-fragment:$rootProject.supportLibVersion"
  implementation "com.android.support:design:$rootProject.supportLibVersion"
  implementation "com.android.support:appcompat-v7:$rootProject.supportLibVersion"
  implementation "com.android.support:gridlayout-v7:$rootProject.supportLibVersion"
  implementation "com.android.support:preference-v7:$rootProject.supportLibVersion"
  implementation "com.android.support.constraint:constraint-layout:1.1.3"
  implementation "com.android.support:support-annotations:$rootProject.supportLibVersion"
  implementation "com.android.support:support-vector-drawable:$rootProject.supportLibVersion"
  implementation "com.android.support:recyclerview-v7:$rootProject.supportLibVersion"
  implementation "com.google.android.gms:play-services-plus:15.0.1"
  
  // Rx
  implementation "io.reactivex.rxjava2:rxandroid:2.1.0"
  implementation "io.reactivex.rxjava2:rxjava:2.2.2"
  
  // Retrofit
  implementation "com.google.code.gson:gson:2.8.5"
  implementation "com.squareup.retrofit2:retrofit:2.4.0"
  implementation "com.squareup.retrofit2:converter-gson:2.4.0"
  implementation "com.squareup.retrofit2:adapter-rxjava2:2.4.0"
  implementation "com.squareup.okhttp3:logging-interceptor:3.11.0"
  
  // Testing
  testImplementation "junit:junit:4.12"
  androidTestImplementation "com.android.support.test:runner:1.0.2"
  androidTestImplementation "com.android.support.test.espresso:espresso-core:3.0.2"
  
  ///---
  // java 8
  implementation "android.arch.lifecycle:common-java8:$archLifecycleVersion"
  
  // Room components
  implementation "android.arch.persistence.room:runtime:$rootProject.roomVersion"
  annotationProcessor "android.arch.persistence.room:compiler:$rootProject.roomVersion"
  androidTestImplementation "android.arch.persistence.room:testing:$rootProject.roomVersion"
  kapt "android.arch.persistence.room:compiler:$rootProject.roomVersion"
  
  // Lifecycle components
  implementation "android.arch.lifecycle:extensions:$rootProject.archLifecycleVersion"
  kapt "android.arch.lifecycle:compiler:$rootProject.archLifecycleVersion"
  annotationProcessor "android.arch.lifecycle:compiler:$rootProject.archLifecycleVersion"
  
  }
  </code></pre>