EditText auto add space when input phone number (phone number in Vietnam). Example: 01234567890 -> 0123 456 7890

PhoneNumberEditText.java

import android.content.Context;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.text.method.DigitsKeyListener;
import android.util.AttributeSet;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;


/**
 * Created by AnhNV@mwork.vn on 22/03/2016.
 */
public class PhoneNumberEditText extends EditText {

    TextWatcher textWatcher = new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
            String phoneNumber = getText().toString();
            phoneNumber = phoneNumber.replaceAll(" ", "");
            if (!validatePhoneNumber(phoneNumber)) {
                setTextColor(getResources().getColor(R.color.red));
            } else {
                setTextColor(getResources().getColor(R.color.green_darker));
            }

            if (isFormattedPhone(s.toString())) {
                return;
            }

            String formatted = formatPhoneNumber(s.toString());
            setText(formatted);
            setSelection(formatted.length());
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    };

    public PhoneNumberEditText(Context context) {
        super(context);
        init();
    }

    public PhoneNumberEditText(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public PhoneNumberEditText(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init(){
        addTextChangedListener(textWatcher);
        setInputType(EditorInfo.TYPE_CLASS_PHONE);
        setKeyListener(DigitsKeyListener.getInstance("0123456789"));
        setSingleLine();
    }

    /**
     * @return
     */
    private boolean validatePhoneNumber(String phoneNumber) {
        boolean result = true;
        // Phone
        String regexPhone = "(\\+\\d{2,4})?\\s?(\\d{6,15})";
        if (TextUtils.isEmpty(phoneNumber) || !phoneNumber.matches(regexPhone)) {
            result = false;
        }

        return result;
    }

    private boolean isFormattedPhone(String rawPhone) {
        String[] separate = rawPhone.split(" ");
        if (separate == null || separate.length == 0) {
            return true;
        }

        if (separate.length == 1) {
            if (separate[0].length() <= 4) {
                return true;
            } else {
                return false;
            }
        }

        if (separate.length == 2) {
            if (separate[0].length() == 4 && separate[1].length() <= 3) {
                return true;
            } else {
                return false;
            }
        }

        if (separate.length >= 3) {
            if (separate[0].length() == 4 && separate[1].length() == 3) {
                return true;
            } else {
                return false;
            }
        }

        return true;
    }

    /**
     * 0123456789xxx -> 0123 456 789xxx
     *
     * @param rawPhone
     * @return
     */
    private String formatPhoneNumber(String rawPhone) {
        rawPhone = rawPhone.replaceAll(" ", "");
        String phoneFormat = "";
        if (rawPhone.length() > 4) {
            phoneFormat += rawPhone.substring(0, 4);
            rawPhone = rawPhone.substring(4);
        } else {
            return rawPhone;
        }
        phoneFormat += " ";
        if (rawPhone.length() > 3) {
            phoneFormat += rawPhone.substring(0, 3);
            rawPhone = rawPhone.substring(3);
        } else {
            phoneFormat += rawPhone;
            return phoneFormat;
        }

        phoneFormat += " " + rawPhone;

        return phoneFormat;
    }

    public String getPhoneNumber() {
        return getText().toString().trim().replaceAll(" ", "");
    }
}

1234567890