LogoutDialogFragment.java

private static final String USERNAME = "Username"; 
...
public static LogoutDialogFragment newInstance(String username) { 
    LogoutDialogFragment fragment = new LogoutDialogFragment();

    // Add the username to the bundle of arguments for the fragment
    Bundle args = new Bundle();
    args.putString(USERNAME, username);
    fragment.setArguments(args);

    return fragment;
}