title: Android Studio Palette/Component Tree
body: <p><strong>Palette items have question mark on them .</strong></p>
  
  <p><a href="https://i.stack.imgur.com/TfB3W.png" rel="nofollow noreferrer">SCREENSHOT</a></p>
  
  <p><strong>this is mine build.gradle script</strong></p>
  
  <pre><code>    compileSdkVersion 27
          minSdkVersion 19
          targetSdkVersion 27
  
  dependencies {
      implementation fileTree(include: ['*.jar'], dir: 'libs')
      implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
      implementation 'com.android.support.constraint:constraint-layout:1.1.3'
      implementation 'junit:junit:4.12'
      implementation 'junit:junit:4.12'
      implementation 'com.android.support.test.espresso:espresso-core:3.0.2'
      implementation 'com.android.support.test:runner:1.0.2'
      implementation 'com.android.support:recyclerview-v7:27.1.1'
      implementation 'com.android.support:appcompat-v7:27.1.1'
      implementation 'com.android.support:design:27.1.1'
      implementation 'com.android.support:cardview-v7:27.1.1'
      implementation 'com.android.support:support-v4:27.1.1'
  }
  </code></pre>