title: Cannot resolve symbol 'AppCompatActivity'
body: <p>I've just tried to use Android Studio. I've created blank project and tried to create <code>Activity</code> which extends <code>AppCompatActivity</code>. Unfortunalty Android Studio "says" that it</p>
  
  <blockquote>
    <p>Cannot resolve symbol 'AppCompatActivity'</p>
  </blockquote>
  
  <p>I have  <code>compile "com.android.support:appcompat-v7:22.0.+"</code> in dependency list of my "app" module and rebuilt project several times. However I can only use <code>ActionBarActivity</code>. What am I doing wrong?</p>