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需引入JAR包 ksoap2-android-assembly-2.5.2-jar-with-dependencies.jar

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import org.ksoap2.SoapEnvelope;
import org.ksoap2.SoapFault;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;


public void getQQOline(String qq) {
	String nameSpace = "http://WebXml.com.cn/";
	String methodName = "qqCheckOnline";
	String endPoint = "http://webservice.webxml.com.cn/webservices/qqOnlineWebService.asmx";
	String soapAction = "http://WebXml.com.cn/qqCheckOnline";

	// 指定WebService的命名空间和调用的方法名
	SoapObject soapObject = new SoapObject(nameSpace, methodName);
	soapObject.addProperty("qqCode", qq);

	SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER10);

	envelope.bodyOut = soapObject;
	envelope.dotNet = true;
	envelope.setOutputSoapObject(soapObject);

	// 调用WebService
	try {
		HttpTransportSE transport = new HttpTransportSE(endPoint);
		transport.call(soapAction, envelope);
	} catch (Exception e) {
		e.printStackTrace();
	}

	// 获取返回的数据
	SoapObject object = (SoapObject) envelope.bodyIn;
	
	// 获取返回的结果(方法1)
	try {
		Object o = envelope.getResponse();
		System.out.println(o.getClass());
	} catch (SoapFault e) {
		e.printStackTrace();
	}
	// 获取返回的结果(方法2)
	String result = object.getProperty(0).toString();
	System.out.println(result);
}