Android WebService connection fails, to help me find the reason

Just started learning Android, many do not know the place. This issue has been found reasons:
information found on the Internet to connect remote database to use Android WebService, with koap2 access WebService data.
I'm here to do a simple test landing:
I use Eclipse built a Dynamic Web Project Project: webTest, write the relevant code, database connectivity test was successful. Class after IPersonImp Right-click on the file name, select "Web Services" -> "Create Web Service" automatically create webservice:

The project deployed to Tomcat, start Tomcat, enter the URL in the browser, it is possible to find wsdl:

Browser Test landing effect (password is wrong, the result is fail):

problem :
create an Android project, MyWebServiceHelper class code:

 import java.io.IOException;
 
 import org.ksoap2.SoapEnvelope;
 import org.ksoap2.serialization.SoapObject;
 import org.ksoap2.serialization.SoapSerializationEnvelope;
 import org.ksoap2.transport.HttpTransportSE;
 import org.xmlpull.v1.XmlPullParserException;
 
 import android.util.Log;
 
 
 public class MyWebServiceHelper {
 
     // WSDL文档中的命名空间   
     private static final String targetNameSpace = "http://service.main";
       
     // WSDL文档中的URL   
     private static final String WSDL = "http://localhost:8181/webTest/services/IPersonImp"; 
       
     //需要调用的方法名(获得Myervices中的login方法)   
     private static final String login="login";  
       
     public String login(String uname, String pwd){
     	String reutrnResult = null;
         SoapObject request =new SoapObject(targetNameSpace,login);
         
         request.addProperty("uname", uname);
         request.addProperty("pwd", pwd);
         
         Log.i("mylog", "request---" + request);
         
         SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(  
                 SoapEnvelope.VER11); 
         
         envelope.dotNet = false; 
         envelope.setOutputSoapObject(request); 
         HttpTransportSE httpTranstation = new HttpTransportSE(WSDL);
         try {  
             Log.i("mylog", "info---" + httpTranstation);//日志打印到这里，就转入下面catch (IOException e)部分
             httpTranstation.call(targetNameSpace+login, envelope);  
             Log.i("mylog", "info");
             if(envelope.getResponse() != null){
             	SoapObject soapObject = (SoapObject) envelope.getResponse(); 
             	Log.i("mylog", "用户名--------"+soapObject.getProperty("name"));
             	Log.i("mylog", "密码--------"+soapObject.getProperty("pwd"));
             	reutrnResult = "ok";
             }
         
         } catch (IOException e) {  
             Log.e("mylog", "error------1111");
             e.printStackTrace();  
             reutrnResult = "连接WSDL失败--1";//运行时android界面返回这个结果
         } catch (XmlPullParserException e) {  
             Log.e("mylog", "error------2222");
             reutrnResult = "连接WSDL失败--2";
             e.printStackTrace();  
         } 
     	return reutrnResult;
     }
     
 }  
 

Logcat error message:

first a system error message Connection failed: java.net.ConnectException: failed to connect to localhost/127.0.0.1 (port 8181): connect failed: ECONNREFUSED ; (Connection refused)
android interface:

This time Tomcat is the start state, I can access the page to refresh http://localhost:8181/webTest/services/IPersonImp?wsdl wsdl, but why Android will fail to connect it?


Another problem ( second question, the first question has nothing to do with the )
webTest works inside IPersonImp class, when it inside getCompanyList method (returning a collection), click the right button and select "Web Services" -> "Create Web Service" warning will appear automatically create a webservice, What is the reason ah? If only the login method (return String) on ​​the matter, anyway, you can not return the collection
IPersonImp code:

 public class IPersonImp implements IPerson {
 	PersonDAO comdao=new PersonDAO();
 	//得到所有用户列表
 	public List<Person> getCompanyList() {
 		List<Person> list=new ArrayList<Person>();
 		try {
 			list=comdao.getCompanyList();
 		} catch (SQLException e) {
 			e.printStackTrace();
 			list=null;
 		}
 		return list;
 	}
 	
 	public String login(String uname, String pwd) {
 		// TODO Auto-generated method stub
 		
 		Person com = new Person();
 		com = comdao.login(uname, pwd);
 		String result = "fail";
 		if(com != null){
 			result = "success";
 		}
 		
 		return result;
 	}
 }
 

warning shots:

------ Solution ------- -------------------------------------
virtual machine to access the machine, without being able to localhost or 127.0.0.1, starting 10.0.0.2.
------ For reference only -------------------------------------- -

Thank you, I changed to 10.0.2.2 localhost can login. Phone emulator but if not, then I can use this method to test the local localhost services?
------ For reference only -------------------------------------- -

Also, could you help me look at the second question is how is it?
Why return to the List collection, select "Web Services" -> "Create Web Service" will appear automatically created webservice screenshot above warning?
------ For reference only - --------------------------------------
landlord made at the source look white? recent But this one is looking webservice read ah, or do not know how to access webservice