title: The import android.os.ServiceManager cannot be resolved
body: <p>I'm using aidl to answer call automagically, code as following:</p>
  
  <pre><code>ITelephony.Stub.asInterface(ServiceManager.getService("phone"))
      .answerRingingCall();
  </code></pre>
  
  <p>I import ServiceManager.class</p>
  
  <pre><code>import android.os.ServiceManager;
  </code></pre>
  
  <p>but there's a problem:The import android.os.ServiceManager cannot be resolved</p>
  
  <p>How can I make it work? Thanks</p>