Java tutorial
//package com.java2s; //License from project: Open Source License import android.util.Base64; public class Main { public static String base64Encode(String phone, String str) { int times = Integer.parseInt(phone.substring(0, 10)) % 4 + 2; for (int i = 0; i < times; i++) { str = Base64.encodeToString(str.getBytes(), Base64.DEFAULT); } return str; } }