SharedPreferences in android

SharedPreferences prefs;

public static Context context;

context =getApplicationContext();

prefs = PreferenceManager.getDefaultSharedPreferences(context);

//put data in sharedpreference

Editor editor = prefs.edit();

editor.putString(USERNAME_MEM", username11 );

editor.commit();

//get data from sharedpreference

String username= prefs.getString("username", null);

{

// do ur work

}