private static SharedPreferences mSharedPref;
     private static  final String KEYNAME = "nombre";

     private  private static SharedPreferences mSharedPref;
     private static  final String KEYNAME = "nombre";

     private MySharedPreferences(){

     }

     public static  void init(Context context){
         if(mSharedPref == null)
             mSharedPref = context.getSharedPreferences("MYPREFS", Activity.MODE_PRIVATE);
     }

     public static void saveName(String name){
         SharedPreferences.Editor prefsEditor = mSharedPref.edit();
         prefsEditor.putString(KEYNAME, name);
         prefsEditor.apply();
     }
     public static String loadName(){
         return mSharedPref.getString(KEYNAME, "");
     }
     MySharedPreferences(){

     }

     public static  void init(Context context){
         if(mSharedPref == null)
             mSharedPref = context.getSharedPreferences("MYPREFS", Activity.MODE_PRIVATE);
     }

     public static void saveName(String name){
         SharedPreferences.Editor prefsEditor = mSharedPref.edit();
         prefsEditor.putString(KEYNAME, name);
         prefsEditor.apply();
     }
     public static String loadName(){
         return mSharedPref.getString(KEYNAME, "");
     }