Question

Android怎样与WebService交互

Answer 1

webservice是一种基于SOAP协议的远程调用标准，通过webservice可以将不同操作系统平台、不同语言、不同技术整合到一起。在android sdk中并没有提供调用webservice的库。因此，需要使用第三方的sdk来调用webservice。PC版本的webservice库非常丰富，但这些对于android来说过于庞大，使用手机的android客户端的sdk有一些，比较常用的是ksoap2。
下面是使用ksoap2调用webservice的一个例子：
package com.test;
import java.io.UnsupportedEncodingException;
import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.AndroidHttpTransport;
import org.ksoap2.transport.HttpTransportSE;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class TestWebserviceActivity extends Activity {

private Button okButton;
//WebService 的命名空间
private static final String NAMESPACE = "http://WebXml.com.cn/";
// WebService地址 服务网址
private static String URL = "http://www.webxml.com.cn/webservices/weatherwebservice.asmx";
//要调用的方法
private static final String METHOD_NAME = "getWeatherbyCityName";
//rest资源，SOAPAction
private static String SOAP_ACTION = "http://WebXml.com.cn/getWeatherbyCityName";
private String weatherToday;
private SoapObject detail;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

okButton = (Button) this.findViewById(R.id.btn_Search);
okButton.setOnClickListener(new Button.OnClickListener() {
public void onClick(View v) {
String city = "北京";
getWeather(city);
}
});
}

public void getWeather(String cityName) {
try {

SoapObject rpc = new SoapObject(NAMESPACE, METHOD_NAME);

rpc.addProperty("theCityName", cityName);

SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);

envelope.bodyOut = rpc;

envelope.dotNet = false;

envelope.setOutputSoapObject(rpc);

HttpTransportSE ht = new HttpTransportSE(URL);

//AndroidHttpTransport ht = new AndroidHttpTransport(URL);

ht.debug = true;

ht.call(SOAP_ACTION, envelope);
//ht.call(null, envelope);

//SoapObject result = (SoapObject)envelope.bodyIn;
//detail = (SoapObject) result.getProperty("getWeatherbyCityNameResult");
detail =(SoapObject) envelope.getResponse();

parseWeather(detail);
return;
} catch (Exception e) {
e.printStackTrace();
}
}
private void parseWeather(SoapObject detail)
throws UnsupportedEncodingException {

String date = detail.getProperty(6).toString();
weatherToday = "今天：" + date.split(" ")[0];
weatherToday = weatherToday + "\n天气：" + date.split(" ")[1];
weatherToday = weatherToday + "\n气温："
+ detail.getProperty(5).toString();
weatherToday = weatherToday + "\n风力："
+ detail.getProperty(7).toString() + "\n";
System.out.println("weatherToday is " + weatherToday);
Toast.makeText(this, weatherToday, Toast.LENGTH_LONG).show();
}
}