android - Update listview - single row - chat from sqlite -

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how can update row in listview (a chat) ?

is easy make customadapter = new (..), if have 50000 message? slow make = new "always"

how update "x" row?

i try adaptermessages.notifydatasetchanged(); , not update, normal, don't know row listview

example : 

user1 : hi                  user2 : hi? (update here) row "x" user1: hello                  user2: aa ok (update here) row "x"

i use adapter update listview, (message receiv or not receiv) http://fielinks.com/sites/default/files/styles/large/public/images/double-check-whatsapp.jpg?itok=qbi0lgql

listview = (listview)rootview.findviewbyid(r.id.listview1);           listdata= getcalldetails();            listview.setadapter(new customadapter(getactivity().getbasecontext(),listdata));   listview.setonitemclicklistener(new  onitemclicklistener() {     @override     public void onitemclick(adapterview<?> arg0, view arg1, int positiontoremove,                         long arg3) {     updatefromdb(id);     listdata.remove(positiontoremove);     adapter.notifydatasetchanged();     }

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