title: Can not get Registration ID in Emulator
body: <p>Hi I am running ADMMessenger sample application provided with SDK.</p>
  
  <p>in which I am not able to get Registration ID in <code>register()</code> method of <code>MainActivity</code>.</p>
  
  <p>Method is like this.</p>
  
  <pre><code>private void register()
  {
      final ADM adm = new ADM(this);
      if (adm.isSupported())
      {
          if(adm.getRegistrationId() == null)
          {
              adm.startRegister();
          } else {
  
  //                final MyServerMsgHandler srv = new MyServerMsgHandler();  
  //                srv.registerAppInstance(getApplicationContext(), adm.getRegistrationId());
          }
  
          Log.v("log_tag","Reg_id:: "+adm.getRegistrationId());
      }
  }
  </code></pre>
  
  <p>in Log cat I am always getting Reg_id:: null</p>
  
  <p>and <code>onRegistrationError()</code> method of <code>SampleADMMessageHandler</code> is calling.</p>
  
  <p>and error at there is <code>ERROR_SERVICE_NOT_AVAILABLE</code></p>
  
  <p>I can not understand what is problem, please help me. </p>