PreferenceRoomActivity.java

Preference_UserProfile userProfile = Preference_UserProfile.getInstance(this);
userProfile.putNickname("my nickname"); // puts a SharedPreference in NickName key.
userProfile.getNickname(); // gets a SharedPreference value in NickName key.
userProfile.containsNickname(); // checks nickname key value is exist in SharedPreference.
userProfile.removeNickname(); // removes nickname key's value in SharedPreference.
userProfile.nicknameKeyName(); // returns nickname fields's key name.
userProfile.getEntityName(); // returns UserProfile entity's name;
userProfile.getkeyNameList(); // returns UserProfile entity's KeyName list of fields.