title: Android Studio design view not displaying correctly
body: <p>I have looked at numerous sites and the suggestions provided here at Stack Overflow. Everything works fine with my Android Studio, except the design view does not display anything. I can drag and drop widgets or modify the XML code by hand and the text gets updated fine, but the changes just don't register on the design or blueprint. I have tried deleting and reinstalling the IDE, changing the SDK version, doing build--> clean, resetting the cache, and adding dependencies. Below is my build.gradle Anyone with a critical eye have suggestions? I don't know what I'm doing. </p>
  
  <pre><code>apply plugin: 'com.android.application'
  
  apply plugin: 'kotlin-android'
  
  apply plugin: 'kotlin-android-extensions'
  
  android {
      compileSdkVersion 28
      defaultConfig {
      applicationId "com.mydrinkmixer.somerestaurant.mydrinkmixer"
      minSdkVersion 15
      targetSdkVersion 28
      versionCode 1
      versionName "1.0"
              testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
      }
      buildTypes {
          release {
              minifyEnabled false
             proguardFiles getDefaultProguardFile('proguard-  android.txt'), 'proguard-rules.pro'
          }
      }
   }
  
     dependencies {
       implementation fileTree(dir: 'libs', include: ['*.jar'])
       implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
       implementation 'com.android.support:appcompat-v7:28.0.0-rc02'
       implementation 'com.android.support.constraint:constraint-layout:1.1.2'
       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'
  }
  </code></pre>