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.
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Thank you, I changed the localhost 10.0.2.2 can login. Phone emulator but if not , then I can use this method to test the local localhost services?
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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 ?
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landlord made at the source look white ? recently was watching webservice not read this one , but , ah, still do not know how to access webservice
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landlord , the phone connection is not solved that problem yet