title: LibGDX - Android Studio cannot resolve symbol
body: <p>we have to create an android application and we want to animate a 3d model.
  Therefore, we wanted to use libgdx. So we added these lines to our build.gradle file in android studio:</p>
  
  <pre><code>ext {
      appName = 'bream'
      gdxVersion = '1.3.1'
  }
  
  repositories {
      mavenCentral()
      mavenLocal()
      maven { url "https://jitpack.io" }
      maven { url 'https://github.com/steffenschaefer/gwt-gradle-plugin/raw/maven-repo/' }
      maven { url "https://oss.sonatype.org/content/repositories/snapshots/" }
      maven { url "https://oss.sonatype.org/content/repositories/releases/" }
  }
  
  dependencies {
      compile 'com.facebook.android:facebook-android-sdk:3.23.0'
      compile 'com.android.support:support-v4:23.0.0'
      compile 'com.google.android.gms:play-services:+'
      compile 'com.android.support:appcompat-v7:23.0.0'
      compile 'com.github.PhilJay:MPAndroidChart:v2.1.6'
      compile "com.badlogicgames.gdx:gdx:$gdxVersion"
  }
  </code></pre>
  
  <p>However, it does not find "com.badlogic.gdx.backends.android" and the AndroidApplication class coming with this import. Does anyone know how to fix this?</p>
  
  <p>Thanks in advance!</p>