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POPopulating Spinner using string values returned by SOAP web service
 

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    <p>I am working on a Android code that returns me String values that I store in a String array.I want to use this String array to populate one of my Spinners.</p> <p>My main intention is that depending on what the user selects in 1st spinner , I want to populate my 2nd spinner using my String array.</p> <blockquote> <p>However, when I try I am getting a NullPointerException even when I am populating the adapter</p> </blockquote> <p>My Android code: </p> <pre><code>public class Mark2 extends Activity { private static final String SOAP_ACTION = "http://tempuri.org/getData"; private static final String METHOD_NAME = "getData"; private static final String NAMESPACE = "http://tempuri.org/"; private static final String URL = "http://10.0.2.2/getsubject/Service1.asmx"; private Spinner s; private Spinner s2; private Spinner s3; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.mainspinner); s = (Spinner) findViewById(R.id.spinner1); s2 = (Spinner) findViewById(R.id.spinner2); String[] myList4=call(); for(int i=0;i&lt;myList4.length;i++) System.out.println(myList4[i]); String[] myList = new String[] {"First half","Second Half"}; String[] myList2=new String[] { "abc", "ghf", "ijk", }; String[] myList3=new String[] { "john", "ann", "joe", }; s.setAdapter(new ArrayAdapter&lt;String&gt; (this,android.R.layout.simple_spinner_item, myList)); s2.setAdapter(new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_item, myList2)); final ArrayAdapter&lt;String&gt; adapter3 = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_item, myList4); final ArrayAdapter&lt;String&gt; adapter2 = new ArrayAdapter&lt;String&gt;(this,android.R.layout.simple_spinner_item, myList3); s.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView&lt;?&gt; parent, View v,int pos, long id) { if(parent.getItemAtPosition(pos).toString().equalsIgnoreCase("First half")) { s2.setSelection(pos); s3.setAdapter(adapter3); } else { s2.setAdapter(adapter2); s2.setSelection(pos); } } @Override public void onNothingSelected(AdapterView&lt;?&gt; arg0) { }}); } public String[] call() { SoapPrimitive responsesData = null; SoapObject request = new SoapObject(NAMESPACE, METHOD_NAME); SoapSerializationEnvelope envelope = new SoapSerializationEnvelope( SoapEnvelope.VER11); envelope.dotNet = true; envelope.setOutputSoapObject(request); HttpTransportSE androidHttpTransport = new HttpTransportSE(URL); androidHttpTransport.debug = true; try { androidHttpTransport.call(SOAP_ACTION, envelope); responsesData = (SoapPrimitive) envelope.getResponse(); System.out.println(" --- response ---- " + responsesData); } catch (SocketException ex) { ex.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } System.out.println( " ----" + responsesData ); String serviceResponse= responsesData .toString(); String[] temp; String delimiter = "#"; temp= serviceResponse.split(delimiter); System.out.println( " ---- length ---- " + temp.length); return temp; } } </code></pre> <p>My logcat:</p> <pre><code> 11-17 15:51:09.668: DEBUG/dalvikvm(125): GC_EXPLICIT freed 1220 objects / 68272 bytes in 164ms 11-17 16:20:29.649: ERROR/AndroidRuntime(620): java.lang.NullPointerException 11-17 16:20:29.649: ERROR/AndroidRuntime(620): at com.example.Mark2$1.onItemSelected(Mark2.java:88) 11-17 16:20:29.649: ERROR/AndroidRuntime(620): at android.widget.AdapterView.fireOnSelected(AdapterView.java:864) 11-17 16:20:29.649: ERROR/AndroidRuntime(620): at android.widget.AdapterView.access$200(AdapterView.java:42) 11-17 16:20:29.649: ERROR/AndroidRuntime(620): at android.widget.AdapterView$SelectionNotifier.run(AdapterView.java:830) 11-17 16:20:29.649: ERROR/AndroidRuntime(620): at android.os.Handler.handleCallback(Handler.java:587) 11-17 16:20:29.649: ERROR/AndroidRuntime(620): at android.os.Handler.dispatchMessage(Handler.java:92) </code></pre> <blockquote> <p>Edit: Line no: 88 is s3.setAdapter(adapter3);</p> </blockquote>
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