Refreshing the listview based on the DB

I am new to android, In my application i have a list view with image,textview's and button.when i click the button in the listview all the data's of the particular items are stored to the sqlite db and also to the webservice then i get a response string from the webservice, i updated this string in to my one of the field of sqlite DB.here i need to set this string into the button of listview by refreshing the listview..how can i do this below is my code

public class MainActivity extends ListActivity implements RegisterContactToServer.AsyncResponseListener {
    ListView lv;
    Cursor cursor,cursor1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list_contact);

        cursor=getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, null, null, null, null);
        startManagingCursor(cursor);
        String[] from={ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,ContactsContract.CommonDataKinds.Phone.NUMBER,ContactsContract.CommonDataKinds.Phone._ID};
        int[] to={R.id.name_entry,R.id.number_entry};



        ContactList listadapter=new ContactList(this,R.layout.single_row1,cursor,from,to);

        setListAdapter(listadapter);


        lv=getListView();
        lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

    }

    class ContactList extends SimpleCursorAdapter implements Filterable {

        private Context context;
        String strfromMobileno="";
        private int layout;
        public ContactList(Context context, int layout, Cursor c,
                String[] from, int[] to) {
            super(context, layout, c, from, to);
            this.context=context;
            this.layout=layout;

            // TODO Auto-generated constructor stub

        }


        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {



            final LayoutInflater inflater = LayoutInflater.from(context);
            View v = inflater.inflate(layout, parent, false);


            return v;
        }

       @Override
        public void bindView(View v, final Context context, Cursor c) {

            int nameCol = c.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME);
            String name = c.getString(nameCol);

            int noCol = c.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER);
            String no = c.getString(noCol);

         final CheckBox p1 = (CheckBox) v.findViewById(R.id.checkBox1);
            final CheckBox p2 = (CheckBox) v.findViewById(R.id.checkBox2);
            final CheckBox p3 = (CheckBox) v.findViewById(R.id.checkBox3);



            final TextView name_text = (TextView) v.findViewById(R.id.name_entry);
            if (name_text != null) {
                name_text.setText(name);
            }

            final TextView no_text = (TextView) v.findViewById(R.id.number_entry);
            if (no_text != null) {
                no_text.setText(no);
            }

            final Contact contact=new Contact();

            final Button btn=(Button)v.findViewById(R.id.button1);
            btn.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                    // TODO Auto-generated method stub




                    String contactName = name_text.getText().toString();
                    String contactNo  =no_text.getText().toString();
                    String statusR=btn.getText().toString();



                    contact.setFromMobileno(contactName);
                    contact.setToMobileno(contactNo);

                    if(p1.isChecked()){
                        int priority1=Integer.parseInt(p1.getText().toString());
                        contact.setPriority1(1);
                        }else{contact.setPriority1(0);}

                        if(p2.isChecked())
                        {
                        int priority2=Integer.parseInt(p2.getText().toString());
                        contact.setPriority2(1);
                        }else{contact.setPriority2(0);}

                        if(p3.isChecked()){
                        int priority3=Integer.parseInt(p3.getText().toString());
                        contact.setPriority3(1);
                        }else{contact.setPriority3(0);}
                        contact.setStatus(statusR);

                   if (!contactName.equals("") ){

                       RegisterConactDBAdapter cdbhelper=new RegisterConactDBAdapter(context);
                       cdbhelper.open();
                       cdbhelper.CreateUser(contact);

                     RegisterContactToServer reg=new RegisterContactToServer(context);
                        reg.execute(contact);


                        Intent intent = new Intent(context,ListRefresh.class);
                        startActivity(intent);



                      }

                }
            });



                }


        }


    @Override
    public void onresponse(String status, String jsonData) {
        // TODO Auto-generated method stub
        RegisterConactDBAdapter cdbheler=new RegisterConactDBAdapter(getBaseContext());
        cdbheler.open();
        cdbheler.UpdateStatus(jsonData);
    }
    }