android - Update Listview after deleting database item -

ive been trying listview update after removing item. here's have far:

mylist.setonitemclicklistener(new adapterview.onitemclicklistener() {         string str = null;          public void onitemclick(adapterview<?> arg0, final view view, int arg2, long arg3) {              //textview txtview = (textview)view.findviewbyid(r.id.txtview);             final string item = ((textview) view.findviewbyid(r.id.txtview)).gettext().tostring();             str = item;             final long arr = arg3;             final string arg22 = longtostring(arg3);              //creating alert dialog             alertdialog.builder builder = new alertdialog.builder(home.this);             builder.setmessage("are sure want delete hike " + str + " ?");             builder.setcancelable(false);             builder.setpositivebutton("yes", new dialoginterface.onclicklistener() {                  public void onclick(dialoginterface dialog, int which) {                     sqlitedatabase db1=openorcreatedatabase("hikemanager", mode_private, null);                     databasehandler db = new databasehandler(home.this);                     string table = "hikes";                      cursor c = db1.rawquery("select id "+ table + "  name='"+item+"'", null);                     int dhike = c.getcolumnindex("name") + 1;                      try {                         hike hike = db.gethike(arr + 1);                         db.deletehike(hike);                         log.d("dlt", "deleted hike @ index " + arr);                         //db.updatelist(adapter, mylist, listitems);                         adapter.remove(arg22);                         adapter.notifydatasetchanged();                         //updatedata();                         db.close();                     } catch (cursorindexoutofboundsexception e) {                         log.d("dlt", "failed delete: " + e.getmessage());                         db.close();                     }                     //db.updatelist(adapter, mylist, listitems);                    }             });             builder.setnegativebutton("no", new dialoginterface.onclicklistener() {                  public void onclick(dialoginterface dialog, int which) {                     // todo auto-generated method stub                     dialog.cancel();                 }             });             alertdialog alert = builder.create();             alert.show();         }     }); 

i have quite bit of unused code in there, have tried few different methods work, have failed far. here updatedata:

private void updatedata() {     // of notes database , create item list     databasehandler db = new databasehandler(this);     final arrayadapter<string> adapter = new arrayadapter<string>(this, r.layout.list_item, r.id.txtview, listitems);     final listview mylist = (listview) findviewbyid(r.id.cardlistview);      int num = db.gethikescount();     (int i=1; i<num+1; ++i){         hike name = db.gethike(i);         string nam = name.getname();         listitems.add(nam);     }     mylist.setadapter(adapter);     db.close(); } 

the updatedata have unintended consequences when use update view after adding item non-empty list, works now. item deleted, since can close app , reload , item gone. cant seem update me.

just use

adapter.notifydatasetchanged();