Phone number formatting an EditText in Android

Question

I am making a simple Address Book app (targeting 4.2) that takes name, address, city, state, zip and phone.

I want to format the phone number input as a phone number

Answer 1

You need to create a class:

public class PhoneTextFormatter implements TextWatcher {

    private final String TAG = this.getClass().getSimpleName();

    private EditText mEditText;

    private String mPattern;

    public PhoneTextFormatter(EditText editText, String pattern) {
        mEditText = editText;
        mPattern = pattern;
        //set max length of string
        int maxLength = pattern.length();
        mEditText.setFilters(new InputFilter[]{new InputFilter.LengthFilter(maxLength)});
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {

    }

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

        Log.d(TAG, "join");

        if (count > 0 && !isValid(phone.toString())) {
            for (int i = 0; i < phone.length(); i++) {
                Log.d(TAG, String.format("%s", phone));
                char c = mPattern.charAt(i);

                if ((c != '#') && (c != phone.charAt(i))) {
                    phone.insert(i, c);
                }
            }

            mEditText.setText(phone);
            mEditText.setSelection(mEditText.getText().length());
        }
    }

    @Override
    public void afterTextChanged(Editable s) {

    }

    private boolean isValid(String phone)
    {
        for (int i = 0; i < phone.length(); i++) {
            char c = mPattern.charAt(i);

            if (c == '#') continue;

            if (c != phone.charAt(i)) {
                return false;
            }
        }

        return true;
    }
}

Use this as follows:

phone = view.findViewById(R.id.phone);
phone.addTextChangedListener(new PhoneTextFormatter(phone, "+7 (###) ###-####"));