android - Update ListView everytime the Data changes -


i'm building chat using php , java, i'm getting data chat using json file, , inserting data calling php file inserts new message database.

i'm listing messages in listview, , trying update listview everytime new message sent, code working, automatically update listview when send new message.

i have click @ chat room again see listview updated. update listview both users, receiver , sender.

i tried update adapter using: notifydatasetchanged(); didn't work.

how can that?

code:

my adapter:

@override protected void onpostexecute(void result) {     super.onpostexecute(result);       // dismiss progress dialog     if (pdialog.isshowing())         pdialog.dismiss();     /**      * updating parsed json data listview      * */       adapter =  new costumeadapter(                     chatroomactivity.this,                     contactlist,                     r.layout.chat_row,                     new string[]{ tag_message, tag_conversation },                     new int[]{ r.id.name, r.id.conversationid });      setlistadapter(adapter);  }

class

public view getview(int position, view convertview, viewgroup parent){        view v = super.getview(position, convertview, parent);         textview text = (textview) v.gettag();        if(text == null){          text = (textview) v.findviewbyid(r.id.name);           v.settag(text);       }        string pos = (string) ((map)getitem(position)).get(tag_position);       text.setbackgroundresource(pos.equals("left") ? r.drawable.bubble_green : r.drawable.bubble_yellow);       conversationid = (textview)v.findviewbyid(r.id.conversationid);       send.setonclicklistener(new view.onclicklistener() {          @override          public void onclick(view v) {              string getmessage = txtmessage.gettext().tostring();             string getconversationid = conversationid.gettext().tostring();              sendmessage mtask = new sendmessage();             mtask.execute(sessionid,getmessage,getconversationid);              adapter.notifydatasetchanged();          }      });        return v;       }

thanks.

you have use adapter.notifydatasetchanged();. have create listener , make listview implements it. listener put adapter.notifydatasetchanged();. call method when each device receives information


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