Android - Pass value through SharedPreferences

//set
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0);
SharedPreferences.Editor editor = pref.edit();
editor.putString("user_name",NAME);
editor.commit();

//get
SharedPreferences pref = getApplicationContext().getSharedPreferences("MyPref", 0);
String username = pref.getString("user_name", null);