Get logged in Android user

gistfile1.java

// To Get
SharedPreferences account = getSharedPreferences("account", 0);
String username = account.getString("username", null);

//To Set
SharedPreferences account = getSharedPreferences("account", 0);
SharedPreferences.Editor edit = account.edit();
edit.putString("username", InsertUsernameHere);
edit.commit();