java - ExpandableListView Change layout of first child -

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i'm trying load 2 different layouts expandable list child. keep getting null pointer, me sounds !=0 not working way intended. doing wrong?

   public view getchildview(final int groupposition, final int childposition,    boolean islastchild, view convertview, viewgroup parent) {     layoutinflater inflater = context.getlayoutinflater();     log.e("comments", "ok position: " + childposition);     if (convertview == null) {         if(childposition==0){             //first view             convertview = inflater.inflate(r.layout.comments_create_comment, null);         }else {             //second view             convertview = inflater.inflate(r.layout.comments_expandable_list_child, null);         }     }     if(childposition!=0){         textview item = (textview) convertview.findviewbyid(r.id.comments_expandable_list_child_text_view);         imageview delete = (imageview) convertview.findviewbyid(r.id.comments_expandable_list_child_delete);         //throwing null pointer exception @ delete.setonclick          //i'm guessing it's still using first view here somehow?         delete.setonclicklistener(new view.onclicklistener() {             public void onclick(view v) {                 list<string> child = comments_feed_collection.get(group_list.get(groupposition));                 child.remove(childposition);                 notifydatasetchanged();             }         });         item.settext(laptop);     }     return convertview; }

exact print out:

04-22 10:27:58.762  21013-21013/com.myapp e/comments﹕ ok position: 0 04-22 10:27:58.772  21013-21013/com.myapp i/editor﹕ setup window support handles 04-22 10:27:58.772  21013-21013/com.myapp e/comments﹕ ok position: 1 04-22 10:27:58.772  21013-21013/com.myapp w/dalvikvm﹕ threadid=1: thread exiting uncaught exception (group=0x4183fda0) 04-22 10:27:58.792  21013-21013/com.myapp e/oh nooo﹕ java.lang.nullpointerexception             @ comments.commentsexpandablelistadapter.getchildview(commentsexpandablelistadapter.java:58)

your problem lies here: 

 if (convertview == null) {         if(childposition==0){             //first view             convertview = inflater.inflate(r.layout.comments_create_comment, null);         }else {             //second view             convertview = inflater.inflate(r.layout.comments_expandable_list_child, null);         }  }

convertview null getchildtypecount times. if didn't override method, convertview inflated once. childposition==0 case. can find here documentation


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