listview - Android how to append new data to a Custom base adapter -

i have custom base adapter extracts new data database on button click, works old data discarded , keep , append new data it. looking on example how append latest data custom base adapter list view in android? , seems incomplete, instance how can append new data old 1 without creating new object.

this area of code struggling with

  @override     protected void onpostexecute(string s) {         super.onpostexecute(s);         customview cv;         try {             listview lv = (listview) m.findviewbyid(r.id.mylistview);             jsonobject jsonn = new jsonobject(result);             jsonarray jarray = jsonn.getjsonarray("myarray");             jsonobject jobject = null;             jsonarray sss = new jsonarray();             (int = 0; < jarray.length(); i++) {                 jobject = jarray.getjsonobject(i);                 jobject.getstring("message");                 sss.put(jobject);             }              jsonn.put("myarray", sss);             if(data==1)             {             cv = new customview(jsonn, m);             dmf.notifydatasetchanged();             lv.setadapter(cv);         }             else             {     // new data should appended here              cv = new customview(jsonn, m);             dmf.notifydatasetchanged();             lv.setadapter(cv);             }          } catch (exception e) {             log.e("jsonexception", "error: " + e.tostring());             system.err.println();         }      } 

i can not figure out how append new data , not create new object. data integer equal 1 on first pass , 2 on other pass. stated before can not seem figure how append on post stating how append latest data custom base adapter list view in android?