android - How to refresh SMS Listview automatically ? -

i creating sms app. sending , receiving sms application , can show them in listview. listview doesn't updated send or receive sms. have press button , after if again go listview activity new sms shown.

how can make listview refresh automatically sms arrives or send ?

code :

public class chatactivity extends listactivity {  private mylistadapter adapter; arraylist<string> item_id = new arraylist<string>(); arraylist<string> item_phone_num = new arraylist<string>(); arraylist<string> item_msg_body = new arraylist<string>(); arraylist<string> item_time = new arraylist<string>(); arraylist<string> item_flag = new arraylist<string>(); arraylist<string> items = new arraylist<string>(); private button btn_send; dbmanager manager; cursor cursor; viewholder holder12; string contact_for_chat; string contact_no; string message_body = ""; calendar c; simpledateformat sdf; string time; edittext et_chat; string flag; string msg = "";  @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     bundle bundle = getintent().getextras();     contact_for_chat = bundle.getstring("contact_name");     contact_for_chat = contact_for_chat.replace(" ", "");     contact_no = util.getcontactnumber(contact_for_chat, chatactivity.this);     toast.maketext(getapplicationcontext(), contact_no, toast.length_long).show();     final viewholder holder = new viewholder();     manager = new dbmanager(this);     cursor = manager.return_all(contact_no);     showevents(cursor);      c = calendar.getinstance();     sdf = new simpledateformat("dd:mmmm:yyyy hh:mm:ss a");     time = sdf.format(c.gettime());     setactionbar();     findviewsbyid();     adapter = new mylistadapter(this);     adapter.notifydatasetchanged();     setlistadapter(adapter);      btn_send = (button) findviewbyid(r.id.button1);     btn_send.setonclicklistener(new onclicklistener() {         public void onclick(view v) {              sendsms();         }     }); }  protected void sendsms() {     smsmanager sms_manager = smsmanager.getdefault();     message_body = et_chat.gettext().tostring();     arraylist<string> parts = sms_manager.dividemessage(message_body);     sms_manager.sendmultiparttextmessage(contact_no, null, parts, null, null);     flag = "1";     manager.insert_sms_data(time, contact_no, message_body,flag);     msg+= "sms :" + contact_for_chat + " \n";     msg += "having number:" + contact_no + " \n";     msg += "as" +message_body + " \n";     msg += "at"+ time + " \n";     toast.maketext(getapplicationcontext(), ""+msg , toast.length_long).show();  }  private void setactionbar() {     actionbar mactionbar = getactionbar();     mactionbar.setdisplayhomeasupenabled(false);     mactionbar.setdisplayshowtitleenabled(false);     layoutinflater minflater = layoutinflater.from(this);     view mcustomview = minflater.inflate(r.layout.actionbar_chat, null);     textview tv_chat = (textview)mcustomview.findviewbyid(r.id.title_text);     tv_chat.settext(contact_for_chat);     colordrawable colordaawable = new colordrawable(color.parsecolor("#cfcfc4"));     mactionbar.setbackgrounddrawable(colordaawable);     mactionbar.setlogo(r.drawable.ic_launcher);     mactionbar.setdisplayhomeasupenabled(true);     mactionbar.setcustomview(mcustomview);     mactionbar.setdisplayshowcustomenabled(true); }  private void findviewsbyid() {     et_chat = (edittext)findviewbyid(r.id.et_chat);     btn_send = (button)findviewbyid(r.id.btn_send); }  private void showevents(cursor cursor) {      item_id = new arraylist<string>(cursor.getcount());     item_phone_num = new arraylist<string>(cursor.getcount());     item_msg_body = new arraylist<string>(cursor.getcount());     item_time = new arraylist<string>(cursor.getcount());     item_flag = new arraylist<string>(cursor.getcount());     int i=0;     while (cursor.movetonext()) {         item_id.add(i+"");         item_time.add(cursor.getstring(1));         item_msg_body.add(cursor.getstring(3));         item_phone_num.add(cursor.getstring(2));         item_flag.add(cursor.getstring(4));         i++;     }    } public class mylistadapter extends baseadapter {     context con;     private layoutinflater layoutinf;     arraylist<boolean> itemchecked = new arraylist<boolean>();     arraylist<string> items_ = new arraylist<string>();      public mylistadapter(chatactivity context) {         con = context;     }      public int getcount() {         return item_id.size();     }      public object getitem(int position) {         return item_id.size();     }      public long getitemid(int position) {         return item_id.get(position).hashcode();     }      public view getview(final int position, view arg1, viewgroup arg2) {          view v = arg1;         viewholder holder = null;         if (v == null) {             layoutinf = (layoutinflater) getsystemservice(context.layout_inflater_service);             v = layoutinf.inflate(r.layout.row_chat, null);             holder = new viewholder();              holder.tv_contact = (textview) v.findviewbyid(r.id.phone_num);             holder.tv_sms_body = (textview) v.findviewbyid(r.id.msg_body);             holder.tv_time = (textview) v.findviewbyid(r.id.time);              v.settag(holder);         } else {             holder = (viewholder) v.gettag();         }          if(item_flag.get(position).equals("1"))         {             holder.tv_sms_body.setbackgroundresource(r.drawable.bubble_green);          }                     else                      {                         holder.tv_sms_body.setbackgroundresource(r.drawable.bubble_yellow);                      }           holder.tv_contact.settext("" + item_phone_num.get(position));           holder.tv_sms_body.settext(item_msg_body.get(position));          holder.tv_time.settext(item_time.get(position));          return v;     } }  public class viewholder {      private textview tv_contact;     private textview tv_sms_body;     private textview tv_time;  } } 

you have use notifydatasetchanged. check out following link. https://stackoverflow.com/a/12229903/2930834