SharedPreferences preferences = getSharedPreferences("IpAndPort", Activity.MODE_PRIVATE);
SharedPreferences.Editor editor = preferences.edit();
editor.putString("IP", "11111");
editor.apply();//写入
String GetIp = preferences.getString("IP", "192.168.0.118");原文：https://www.cnblogs.com/sunjian43792901/p/12980637.html