Question

I have a problem in showing value in spinner after XML parsing. I had done XML parsing and now I want to display the parsed result in spinner, but my application forces close when run. Code snippet is given below.

public class parsedspinner extends Activity {
    String name = null;
    private String array_spinner[];

    /** Create Object For SiteList Class */
    SitesList sitesList = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    try {


            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();
            XMLReader xr = sp.getXMLReader();

            /** Send URL to parse XML Tags */
            URL sourceUrl = new URL(
                    "http://www.arteonline.mobi/iphone/output.php?estado=1");

            /** Create handler to handle XML Tags ( extends DefaultHandler ) */
            MyXMLHandler myXMLHandler = new MyXMLHandler();
            xr.setContentHandler(myXMLHandler);
            xr.parse(new InputSource(sourceUrl.openStream()));

        } catch (Exception e) {
            System.out.println("XML Pasing Excpetion = " + e);
        }
        /** Get result from MyXMLHandler SitlesList Object */
         sitesList = MyXMLHandler.sitesList;
        /** Assign textview array lenght by arraylist size */


        /** Set the result text in textview and add it to layout */
        for (int i = 0; i < sitesList.getName().size(); i++) {

            name=sitesList.getName().get(i);
            array_spinner=new String[sitesList.getName().size()];
            array_spinner[i]=name;
            Spinner s = (Spinner) findViewById(R.id.Spinner01);
**//till here no problem** when using array adapter then forse close..

            **ArrayAdapter adapter = new ArrayAdapter(this,
            android.R.layout.simple_spinner_item, array_spinner);
            s.setAdapter(adapter)**;
**when i comented array adapterand set adapter above then values also show in log cat then defnetly problem in above 2 lines what is not gettig????pls help me...**

            Log.i("array_spinner"+i,array_spinner[i]);
        }
}

error

05-16 15:51:33.506: ERROR/AndroidRuntime(1229): FATAL EXCEPTION: main
05-16 15:51:33.506: ERROR/AndroidRuntime(1229): java.lang.NullPointerException
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:355)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.ArrayAdapter.getView(ArrayAdapter.java:323)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.AbsSpinner.onMeasure(AbsSpinner.java:192)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.View.measure(View.java:8313)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1017)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:386)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.View.measure(View.java:8313)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.View.measure(View.java:8313)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:531)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.LinearLayout.onMeasure(LinearLayout.java:309)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.View.measure(View.java:8313)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3138)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:250)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.View.measure(View.java:8313)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.ViewRoot.performTraversals(ViewRoot.java:839)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1859)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.os.Looper.loop(Looper.java:123)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at android.app.ActivityThread.main(ActivityThread.java:3683)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at java.lang.reflect.Method.invokeNative(Native Method)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at java.lang.reflect.Method.invoke(Method.java:507)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-16 15:51:33.506: ERROR/AndroidRuntime(1229):     at dalvik.system.NativeStart.main(Native Method)
05-16 15:51:33.525: WARN/ActivityManager(60):   Force finishing 

Answer 1

You should remove the

• array_spinner initialization, and
  the
• ArrayAdapter declaration and
  attaching code from your for cycle,

so it won’t apply for every item in
your list:

array_spinner = new String[sitesList.getName().size()];
for (int i = 0; i < sitesList.getName().size(); i++)
{
    name = sitesList.getName().get(i);
    array_spinner[i] = name;
    Log.i("array_spinner" + i, array_spinner[i]);
}
Spinner s = (Spinner) findViewById(R.id.Spinner01);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
    android.R.layout.simple_spinner_item, array_spinner);
s.setAdapter(adapter);

The NullPointerException was thrown because of the array_spinner got initialized as many times as much items you’ve got, and so it only contained one data, on the other positions it had null.

Update

If you don’t really need that array_spinner String array, you could avoid it, initializing your ArrayAdapter as:

sitesList = MyXMLHandler.sitesList;
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
    R.layout.simple_spinner_item, sitesList.getName());
s.setAdapter(adapter);

This way you won’t need that whole for cylcle at all!