if (authScheme != null) {
final AlertDialog alert = new AlertDialog.Builder(this).create();
alert.setMessage("To get started, you will need to login to " + providerName);
alert.setButton("Login", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
alert.dismiss();
String url = null;
try {
url = authScheme.getAuthorizationUrl(scheme + "://");
persistRequestToken(authScheme.getRequestToken(), providerName);