Android中如何調(diào)用Web Services

??Android中調(diào)用Web Services有很多方法，我們現(xiàn)在使用的是ksoap，它是SOAP web services的客戶端包，ksoap現(xiàn)在版本為2.0.它的一個(gè)主要優(yōu)點(diǎn)就是對(duì)dotNET兼容性比較不錯(cuò)。

首先下載ksoap的包文件，在Eclispe的Package Explorer中右鍵項(xiàng)目，Build Path>Add Libraries，找到ksoap2-android-assembly-2.4-jar-with-dependencies.jar添加該引用。代碼如下：

? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33public class WSHelper {????finalstatic String WSUrl="http://xxx/WSUrl.asmx";??????privatestatic String namespace ="http://tempuri.org/";????/*************************************?????* 獲取web services內(nèi)容?????* @param url?????* @param params?????* @return?????*************************************/????publicstatic String GetResponse(String method,List??????????????????try{????????????String url = WSUrl;????????????SoapObject request =new SoapObject(namespace, method);????????????for(inti=0,len=params.size();i<len;i++){????????????????request.addProperty(params.get(i).getName(), params.get(i).getValue());????????????}????????????SoapSerializationEnvelope envelope =????????????????newSoapSerializationEnvelope(SoapEnvelope.VER11); ????????????envelope.dotNet =true; ????????????envelope.setOutputSoapObject(request);??????????????????????????AndroidHttpTransport androidHttpTransport =new AndroidHttpTransport(url);????????????androidHttpTransport.call(namespace + method, envelope);??????????????????????????SoapPrimitive result = (SoapPrimitive)envelope.getResponse();????????????returnresult.toString();????????}catch (Exception e) {????????????return"Error:calling the web services error";????????}????}}

調(diào)用時(shí)代碼如下：

? 1 2 3 4String method = "MethodName";//方法名稱Listnew ArrayListparams.add(newBasicNameValuePair("userId", String.valueOf(1995)));return WSHelper.GetResponse(method,params);

這里參數(shù)可以定義多個(gè)，返回時(shí)是以String類似來返回。

注意由于我們調(diào)用Web sevices，就需要程序有訪問網(wǎng)絡(luò)的權(quán)限，因此需要在AndroidManifest.xml中manifest節(jié)中增加訪問網(wǎng)絡(luò)權(quán)限的定義。