How to format a String number into a US phone number format

Question

I have an EditText and I want to format the whatever numbers are entered in the EditText into the US phone number format such as 1(123)123-123 so if the user enters the digit 1 automatically ( will be added this should work for deleting as well. I was able to add a text watcher and set up the logic but I am getting messed up during handling the deletion case.

Here is my code logic to format the first bracket but if we delete the bracket then it wont work

editText.addTextChangedListener(new TextWatcher() {
        public int after;
        public int before;

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            before = count;
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            after = count;

        }

        @Override
        public void afterTextChanged(Editable s) {
            editText.removeTextChangedListener(this);
            if (before < after) {
                if (s.length() == 4 && s.charAt(0) == '1') {
                    String formated = "1 (" + s.toString().substring(1, 4) + ")";
                    editText.setText(formated);
                    editText.setSelection(editText.getText().toString().length());
                }
            }

            editText.addTextChangedListener(this);
        }
    });

One option here would just be to use three different boxes for the area code, exchange, and phone number. — Tim Biegeleisen, Oct 17 '17 at 08:01
You seem to be pretty new here, so here, please provide some of the code you are using already. — Qohelet, Oct 17 '17 at 08:04
https://stackoverflow.com/questions/5114762/how-do-format-a-phone-number-as-a-string-in-java — John Joe, Oct 17 '17 at 08:17
@Qohelet I have added the code , please check it out and let me know if you can help me out — Akash Bangad, Oct 17 '17 at 08:17

score 0 · Answer 1 · answered Oct 17 '17 at 08:33

I wouldn't use this functionality to check if the text was changed:

if (before < after)

Just given the case someone uses copy-paste to replace the phone number or marks one digit before replacing it. Better save your text somewhere and if !oldtext.equals(s.toString()) continue.

Assuming editText is your Textbox. Code is also untested, use at your own risk.

    public void afterTextChanged(Editable s) {
                editText.removeTextChangedListener(this);
                if (before < after) {
                    if (s.length() == 4 && s.charAt(0) == '1') {
                        long phoneFmt = Long.parseLong(s.toString().replaceAll("[^\\d]", ""),10);

DecimalFormat phoneDecimalFmt = new DecimalFormat("0000000000");
String phoneRawString= phoneDecimalFmt.format(phoneFmt);

java.text.MessageFormat phoneMsgFmt=new java.text.MessageFormat("({0})-{1}-{2}");
    //suposing a grouping of 3-3-4
String[] phoneNumArr={phoneRawString.substring(0, 3),
          phoneRawString.substring(3,6),
          phoneRawString.substring(6)};


                        editText.setText(phoneMsgFmt.format(phoneNumArr));
                        editText.setSelection(editText.getText().toString().length());
                    }
                }

                editText.addTextChangedListener(this);
            }

How to format a String number into a US phone number format

1 Answers1