Filter listview with checkbox, privious checked not retrive after filter listview

after filter list-view previous checked item result not get,just get filter result while when search-view set empty all checked item get.

    public void showResult() {
for (Contactmodel p : contactadapter.getBox()) {
            if (p.box) {
                name +=   p.getName()+" ";
                number +=  p.getContact()+",";
            }}
            if (number != "") {
                Intent intent = new Intent(getApplicationContext(), Setalert.class);
                intent.putExtra(key_phoneno, number);
                intent.putExtra(key_recipname, name);
                startActivity(intent);
                overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
        Toast.makeText(getApplication(),number,Toast.LENGTH_SHORT).show();

            } else {
                alerts(Viewcontacts.this, R.string.nocontactselected);
            }
    }