title: How to import javax.annotation.Nullable?
body: <p>I use Android Studio 3.x and Gradle build script.</p>
  
  <p>How can I import javax.annotation.* packages?</p>
  
  <p>Here is my Gradle depedencies example.</p>
  
  <pre><code>dependencies {
      implementation fileTree(dir: 'libs', include: ['*.jar'])
      implementation 'com.android.support.constraint:constraint-layout:1.1.0'
      implementation 'com.android.support:support-v4:27.0.0'
      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>