title: AppCompatActivity cannot be resolved to a type
body: <p>I am trying to add Theme to my project. It requires appcompat v7.   </p>
  
  <p>I added the support library according to the steps mentioned in the Android developer website. After searching a lot I came to know that support library v4 will conflict with support library v7.</p>
  
  <p>So I removed the android library v4 from my project. Because of that now I got the <code>NotificationCompa</code>t error(<code>import android.support.v4.app.NotificationCompat; import android.support.v4.app.NotificationCompat.Builder;</code>).</p>
  
  <p>What I have to do? Please someone help me in resolving the issue. Thanks in advance</p>