WebService example for Android weather forecast call

The android SDK does not provide a library to call WebService. Therefore, you must use a third-party SDK to call WebService. Ksoap2-android-assembly-2.5.2-jar-with-dependencies.jar I use

When importing an incorrect package, refer to my previous blog

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Code details:

Package CN. BZU. weatherforecast. soap; 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; public class soaputil {public static object dotransport (final string wsdlurl, final string webmethod, string cityname) {String namespace = "http://WebXml.com.cn/"; // WebService namespace soapobject = new soapobject (namespace, webmethod); soapobject. addproperty ("thecityname", cityname); // you can specify the value of the parameter system. out. println (cityname); // generate the SOAP request information soapserializationenvelope = new soapserializationenvelope (soapenvelope. ver11); soapserializationenvelope. bodyout = soapobject; soapserial Izationenvelope. DOTNET = true; soapserializationenvelope. setoutputsoapobject (soapobject); // create an httptransportsse object. Httptransportse = new httptransportse (wsdlurl); httptransportse. DEBUG = true; string soap_action = "http://WebXml.com.cn/" + webmethod; system. out. println (soap_action); try {// call the WebService method httptransportse using the call method. call (soap_action, soapserializationenvelope); // obtain the returned result of the WebService method if (soapserializationenvelope. getresponse ()! = NULL) {soapobject result = (soapobject) soapserializationenvelope. getresponse (); system. out. println ("Result:" + result); return result ;}} catch (ioexception e) {// todo auto-generated catch blocke. printstacktrace ();} catch (xmlpullparserexception e) {// todo auto-generated catch blocke. printstacktrace ();} return NULL ;}}

Package CN. BZU. weatherforecast; import Org. ksoap2.serialization. soapobject; import CN. BZU. weatherforecast. soap. soaputil; import android. OS. bundle; import android. app. activity; import android. view. menu; import android. view. view; import android. widget. button; import android. widget. edittext; import android. widget. textview; public class mainactivity extends activity {private edittext citytext; private button serach; private textview resultview; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (savedinstancestate); setcontentview (R. layout. activity_main); citytext = (edittext) findviewbyid (R. id. city); serach = (button) findviewbyid (R. id. search); resultview = (textview) findviewbyid (R. id. result); serach. setonclicklistener (new view. onclicklistener () {@ overridepublic void onclick (view v) {string cityname = citytext. gettext (). tostring (); string wsdlurl = "http://www.webxml.com.cn/WebServices/WeatherWebService.asmx"; string method = "getweatherbycityname"; // call method of WebService soapobject result = (soapobject) soaputil. dotransport (wsdlurl, method, cityname); system. out. println ("Result:" + result); resultview. settext (result. getproperty (10 ). tostring () ;}}) ;}@ override public Boolean oncreateoptionsmenu (menu) {getmenuinflater (). inflate (R. menu. activity_main, menu); Return true ;}}

Layout file:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><TextView android:layout_width="fill_parent"android:layout_height="wrap_content" android:text="@string/city" /><EditText android:id="@+id/city" android:layout_width="fill_parent"android:layout_height="wrap_content" /><Button android:id="@+id/search" android:layout_width="wrap_content"android:layout_height="wrap_content" android:text="@string/search" /><TextView android:id="@+id/result" android:layout_width="fill_parent"android:layout_height="wrap_content" /></LinearLayout>

Error: Java. Lang. nullpointerexception

Double-click error. The error code is resultview. settext (result. getproperty (10). tostring ());

Analysis: The resultview or result is a null pointer, And the resultview is a lookup component with a low possibility of error, so it is likely that the result is a null pointer. If the result is null, check the code: soapobject result = (soapobject) soaputil. dotransport (wsdlurl, method, cityname); check whether wsdlurl can be opened, whether method is called correctly, and finally consider soaputil. dotransport method is correct
Finally, do not forget to set the permission <uses-Permission Android: Name = "android. Permission. Internet"> </uses-Permission> In androidmanifest. xml. Otherwise, a null pointer may be reported.