//1.
public static SharedPreferences PreferenceManager.getDefaultSharedPreferences(Context context) {
    return context.getSharedPreferences(getDefaultSharedPreferencesName(context), getDefaultSharedPreferencesMode());
}

//2.
public SharedPreferences Activity.getPreferences(int mode) {
    return getSharedPreferences(getLocalClassName(), mode);
}

//3.
public SharedPreferences ContextWrapper.getSharedPreferences(String name, int mode) {
    return mBase.getSharedPreferences(name, mode);
}