如何正确地从android请求web服务？

我正在尝试使用web服务：

@WebService(serviceName = "SayHelloService")
public class SayHelloService {
    @WebMethod(operationName = "hello")
    public String hello(@WebParam(name = "name") String txt) {
        //return "Hello " + txt + " !";
        return "Application submitted successfully!";
    }
}

从android应用程序：

public class MainActivity extends Activity {
    Button b;
    TextView tv;
    String editText = "me";
    String displayText; 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b = (Button) findViewById(R.id.submit_button);
        tv = (TextView) findViewById(R.id.ws_response_string);
        b.setOnClickListener(new OnClickListener() 
        {
               public void onClick(View v) 
               {               
                   AsyncCallWS task = new AsyncCallWS();
                   task.execute();
               }
           });
    private class AsyncCallWS extends AsyncTask<String, Void, Void> 
    {
        @Override
        protected Void doInBackground(String... params) 
        {                
            //Invoke webservice                
            displayText = WebService.invokeHelloWorldWS(editText,"hello");
            return null;
        }
        @Override
        protected void onPostExecute(Void result) 
        {
            tv.setText(displayText);
        }
        @Override
        protected void onPreExecute() {}
        @Override
        protected void onProgressUpdate(Void... values) {}
    }
}

我的wsdl看起来像：

<types>
<xsd:schema>
<xsd:import namespace="http://example.vnsgbt.org/" schemaLocation="http://localhost:8080/HelloWorldWebService/SayHelloService?xsd=1"/>
</xsd:schema>
</types>
<message name="hello">
<part name="parameters" element="tns:hello"/>
</message>
<message name="helloResponse">
<part name="parameters" element="tns:helloResponse"/>
</message>
<portType name="SayHelloService">
<operation name="hello">
<input wsam:Action="http://example.vnsgbt.org/SayHelloService/helloRequest" message="tns:hello"/>
<output wsam:Action="http://example.vnsgbt.org/SayHelloService/helloResponse" message="tns:helloResponse"/>
</operation>
</portType>
<binding name="SayHelloServicePortBinding" type="tns:SayHelloService">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"/>
<operation name="hello">
<soap:operation soapAction=""/>
<input>
<soap:body use="literal"/>
</input>
<output>
<soap:body use="literal"/>
</output>
</operation>
</binding>
<service name="SayHelloService">
<port name="SayHelloServicePort" binding="tns:SayHelloServicePortBinding">
<soap:address location="http://localhost:8080/HelloWorldWebService/SayHelloService"/>
</port>
</service>

我一直从异常中获取错误消息，而不是从web服务中获取成功消息。 我猜我设置SOAP属性的方式有问题。 你能告诉我是什么问题吗？

---

更新：我收到的错误消息是：EconRefused（连接被拒绝）

我发现问题是因为我在android emulator上使用了localhost

这在这里解释

---

谢谢大家的努力

如果您正在编写服务器和客户端，我强烈建议使用rest和json，因为soap和xml对于移动设备来说体积庞大，处理速度慢，在移动网络上传输速度慢。您能发布您收到的错误消息吗？它们可能是问题的一个指标，我知道休息的简单性。我当然更喜欢休息。然而，我也在尝试学习SOAP，这导致了这个练习。我从异常中得到的错误消息是：econnreference（连接被拒绝）。

<types>
<xsd:schema>
<xsd:import namespace="http://example.vnsgbt.org/" schemaLocation="http://localhost:8080/HelloWorldWebService/SayHelloService?xsd=1"/>
</xsd:schema>
</types>
<message name="hello">
<part name="parameters" element="tns:hello"/>
</message>
<message name="helloResponse">
<part name="parameters" element="tns:helloResponse"/>
</message>
<portType name="SayHelloService">
<operation name="hello">
<input wsam:Action="http://example.vnsgbt.org/SayHelloService/helloRequest" message="tns:hello"/>
<output wsam:Action="http://example.vnsgbt.org/SayHelloService/helloResponse" message="tns:helloResponse"/>
</operation>
</portType>
<binding name="SayHelloServicePortBinding" type="tns:SayHelloService">
<soap:binding transport="http://schemas.xmlsoap.org/soap/http" style="document"/>
<operation name="hello">
<soap:operation soapAction=""/>
<input>
<soap:body use="literal"/>
</input>
<output>
<soap:body use="literal"/>
</output>
</operation>
</binding>
<service name="SayHelloService">
<port name="SayHelloServicePort" binding="tns:SayHelloServicePortBinding">
<soap:address location="http://localhost:8080/HelloWorldWebService/SayHelloService"/>
</port>
</service>