java - How do I solve NullPointerException in CustomList -


this customlist class

customlist:

public class customlist extends arrayadapter<string> {  private final activity context; private final string[] web; private final integer[] imageid; public customlist(activity context,string[] web, integer[] imageid) {     super(context, r.layout.single_row, web);     this.context = context;     this.web = web;     this.imageid = imageid;  } @override public view getview(int position, view view, viewgroup parent) {     layoutinflater inflater = context.getlayoutinflater();     view rowview= inflater.inflate(r.layout.single_row, null, true);     textview txttitle = (textview) rowview.findviewbyid(r.id.txt);      imageview imageview = (imageview) rowview.findviewbyid(r.id.img);     txttitle.settext(web[position]);      imageview.setimageresource(imageid[position]);     return rowview;   } }

and imageid array fill while loop below

while(crs.movetonext()){           string img = crs.getstring(crs.getcolumnindex("icon")); try  {     imageid[i] = integer.parseint(img); }  catch(numberformatexception nfe) {}  i++; }

but when run see error in customlist error on line after end of class

imageview.setimageresource(imageid[position]);

logcat :

        2021-2021/com.exercise.androidhtml e/androidruntime﹕ fatal exception: main java.lang.nullpointerexception         @ com.exercise.androidhtml.customlist.getview(customlist.java:35)         @ android.widget.abslistview.obtainview(abslistview.java:2177)         @ android.widget.listview.measureheightofchildren(listview.java:1247)         @ android.widget.listview.onmeasure(listview.java:1159)         @ android.view.view.measure(view.java:15848)         @ android.widget.relativelayout.measurechildhorizontal(relativelayout.java:728)         @ android.widget.relativelayout.onmeasure(relativelayout.java:477)         @ android.view.view.measure(view.java:15848)         @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5012)         @ android.widget.framelayout.onmeasure(framelayout.java:310)         @ android.view.view.measure(view.java:15848)         @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5012)         @ com.android.internal.widget.actionbaroverlaylayout.onmeasure(actionbaroverlaylayout.java:302)         @ android.view.view.measure(view.java:15848)         @ android.view.viewgroup.measurechildwithmargins(viewgroup.java:5012)         @ android.widget.framelayout.onmeasure(framelayout.java:310)         @ com.android.internal.policy.impl.phonewindow$decorview.onmeasure(phonewindow.java:2189)         @ android.view.view.measure(view.java:15848)         @ android.view.viewrootimpl.performmeasure(viewrootimpl.java:1905)         @ android.view.viewrootimpl.measurehierarchy(viewrootimpl.java:1104)         @ android.view.viewrootimpl.performtraversals(viewrootimpl.java:1284)         @ android.view.viewrootimpl.dotraversal(viewrootimpl.java:1004)         @ android.view.viewrootimpl$traversalrunnable.run(viewrootimpl.java:5481)         @ android.view.choreographer$callbackrecord.run(choreographer.java:749)         @ android.view.choreographer.docallbacks(choreographer.java:562)         @ android.view.choreographer.doframe(choreographer.java:532)         @ android.view.choreographer$framedisplayeventreceiver.run(choreographer.java:735)         @ android.os.handler.handlecallback(handler.java:730)         @ android.os.handler.dispatchmessage(handler.java:92)         @ android.os.looper.loop(looper.java:137)         @ android.app.activitythread.main(activitythread.java:5103)         @ java.lang.reflect.method.invokenative(native method)         @ java.lang.reflect.method.invoke(method.java:525)         @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:737)         @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553)         @ dalvik.system.nativestart.main(native method)

it seems imageview or imageid null. please, double check you're setting imageid value, , single_row layout has imageview img id.


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