textwatcher to format russian phone numbers like +7 800 555 4444

AwesomeUniversalUltimatePhoneTextWatcher.java

package ru.firsto.testtesttest.ui.activity.auth;

import android.text.Editable;
import android.text.TextWatcher;

/**
 * @author razor
 * @created 23.03.17
 **/

public class AwesomeUniversalUltimatePhoneTextWatcher implements TextWatcher {
    public static final char SPACE_CHAR = ' ';
    public static final String SPACE = " ";


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

    }

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

    }

    @Override
    public synchronized void afterTextChanged(Editable s) {
        if (s.length() > 0 && !s.toString().startsWith("+")) s.insert(0, "+");
        if (s.length() > 1 && !s.toString().startsWith("+7")) s.insert(1, "7");

        if (s.length() > 2 && (s.charAt(2) != SPACE_CHAR)) s.insert(2, SPACE);
        if (s.length() > 6 && (s.charAt(6) != SPACE_CHAR)) s.insert(6, SPACE);
        if (s.length() > 10 && (s.charAt(10) != SPACE_CHAR)) s.insert(10, SPACE);

        if (s.length() > 15) s.replace(0, s.length(), s.toString().substring(0, 15));
    }
}