title: Android Studio -- Designer screen blank
body: <p>I created a new Android Project in Android Studio 3.1.3 on Windows 7:</p>
  
  <ul>
  <li>included Kotlin support</li>
  <li>API 15: Android 4.0.3</li>
  <li>Basic Activity</li>
  </ul>
  
  <p>I opened content_main.xml in Design View.  Even though it will have a <code>TextView</code> saying "Hello World" by default, this was not shown on the Design screen.  Instead, what I am shown is a blank screen with "android...CoordinatorLayout" text in the center:</p>
  
  <p><a href="https://i.stack.imgur.com/b3GM8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/b3GM8.png" alt="Designer View"></a></p>
  
  <p>My <code>build.gradle</code> (Module: app) file is:</p>
  
  <pre><code>apply plugin: 'com.android.application'
  apply plugin: 'kotlin-android'
  apply plugin: 'kotlin-android-extensions'
  
  android {
      compileSdkVersion 28
      defaultConfig {
          applicationId "com.test.myapplication"
          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-jre7:$kotlin_version"
      implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
      implementation 'com.android.support.constraint:constraint-layout:1.1.2'
      implementation 'com.android.support:design:28.0.0-alpha3'
      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>