android - ListView with custom arrayadapter won't update properly after call to onDestroy() then onCreate() -

i have listview custom array adapter:

public class smsmessageadapter extends arrayadapter<contactmessage> {  private arraylist<contactmessage> items;  public smsmessageadapter(context context, int textviewresourceid, arraylist<contactmessage> items) {     super(context, textviewresourceid, items);     this.items = items; }  @override public view getview(int position, view convertview, viewgroup parent) {     view v = convertview;     if(v == null) {         layoutinflater vi = (layoutinflater)getcontext().getsystemservice(context.layout_inflater_service);         v = vi.inflate(r.layout.message, null);     }     contactmessage c = items.get(position);     if(c != null) {         string name = c.getcontact();         if(name.equals("me")) v.setbackgroundresource(r.drawable.sms_history_outgoing_background_gradient);         else v.setbackgroundresource(r.drawable.sms_history_incoming_background_gradient);         textview contactname = (textview) v.findviewbyid(r.id.message_contact_name);         textview body = (textview) v.findviewbyid(r.id.message_body);         textview date = (textview) v.findviewbyid(r.id.message_date_time);         if(contactname != null) {              contactname.settext(name);         }         if(body != null) {             body.settext(c.getbody());         }         if(date != null) {             date.settext(c.getformattedtimestring());         }     }     return v; } } 

i have method in main activity updates listview adding items onto array list associated custom array adapter:

private void displaycontactsmshistory(string phonenumber) {     contact c = new contact();      for(contact contact : mcontactsarraylist) {         if(getonlynumerics(phonenumber).equals(getonlynumerics(contact.getphonenumber()))) {             c = contact;         }     }      hashmap<string, boolean> unreadpositions = mcontactsadapter.getunreadmap();     unreadpositions.put(getonlynumerics(phonenumber), false);     mcontactsadapter.setunreadmap(unreadpositions);      hashmap<string, boolean> selectedposition = mcontactsadapter.getselectedmap();     for(string key : selectedposition.keyset()) {         selectedposition.put(key, false);     }     selectedposition.put(getonlynumerics(phonenumber), true);     mcontactsadapter.setselectedmap(selectedposition);      string contactname;      if(c.hasname()) contactname = c.getname();     else contactname = phonenumber;      mconversationarrayadapter.clear();      if(!db.isopen()) db = db.open();     cursor smshistory = db.getsmsforcontact(phonenumber);     startmanagingcursor(smshistory);     int bodyindex = smshistory.getcolumnindex(dbadapter.key_body);     int dateindex = smshistory.getcolumnindex(dbadapter.key_date);     int typeindex = smshistory.getcolumnindex(dbadapter.key_type);     if(smshistory.movetofirst()) {         while(!smshistory.isafterlast()) {             string body = smshistory.getstring(bodyindex);             string datestring = smshistory.getstring(dateindex);             dateformat df = dateformat.getdatetimeinstance(dateformat.long, dateformat.long);             date date;             try {                 date = df.parse(datestring);             } catch (parseexception e) {                 log.e(tag, "error parsing date string while displaying contact info:", e);                 date = new date(0);             }              if(smshistory.getint(typeindex) == dbadapter.received) {                 smshistoryarraylist.add(new contactmessage(date, contactname, body));             } else {                 smshistoryarraylist.add(new contactmessage(date, null, body));             }              smshistory.movetonext();         }     }     stopmanagingcursor(smshistory);     if(db.isopen()) db.close();  } 

the update method can called 2 different places in code; 1) if user selects item listview, , 2) if call method directly in situations. works find , dandy, except in situation user presses button (which initiates call ondestroy()), returns app (causing new call oncreate()). if happens, listview update 1 place in code (if user selects item in other listview). other situations update method called, code executed listview not update. i've run through debug tool, watching variables inside update method , can't see reason why listview not updating.

also note, if user presses home button, instead of button, , returns app, works fine. in situation ondestroy() , oncreate() never called, onstop() , onstart().

if necessary can post oncreate() , ondestroy(), can there nothing in 2 methods believe causing error (oncreate() loads preferences , sets layout, , ondestroy() closes database).

there several way achieve this.

1. make arraylist variable local (declare in side function).
2. clear arraylist variable

i hope helpful you