Mask an EditText with Phone Number Format NaN like in PhoneNumberUtils

Question

I want to make user inputted phone number in an editText to dynamically change format every time the user inputs a number. That is, when user inputs up to 4 digits, like 714

Answer 1

Just add the following to EditText for Phone Number to get a formatted phone number(###-###-####)

Phone.addTextChangedListener(new TextWatcher() {

        int length_before = 0;

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

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

        }

        @Override
        public void afterTextChanged(Editable s) {
            if (length_before < s.length()) {
                if (s.length() == 3 || s.length() == 7)
                    s.append("-");
                if (s.length() > 3) {
                    if (Character.isDigit(s.charAt(3)))
                        s.insert(3, "-");
                }
                if (s.length() > 7) {
                    if (Character.isDigit(s.charAt(7)))
                        s.insert(7, "-");
                }
            }
        }
    });