if(!TextUtils.isEmpty(pNumber) && pNumber.length() > 6 ){            StringBuilder sb  =new StringBuilder();            for (int i = 0; i < pNumber.length(); i++) {                char c = pNumber.charAt(i);                if (i >= 3 && i <= 6) {                    sb.append('*');                } else {                    sb.append(c);                }            }            mPhoneNumber.setText(sb.toString());        }