/**
 * Verifies the user's credentials and performs U2F authentication.
 */
public class SignInActivity
        extends Activity
        implements SurePassIdU2fSign.Listener {
    public static final String U2F_SERVER_URL = "https://fidocert.surepassid.com/server.aspx";

    ///////////////////////
 // working variables //
 ///////////////////////
  private SurePassIdU2fSign mU2fSign;

    private VerifyUsernamePasswordTask mVerifyUsernamePasswordTask = null;

    ///////////////////
 // UI references //
 ///////////////////
  private EditText mUsernameView;
    private EditText mPasswordView;
    private TextView mStatusMessageView;
    private Button mSignInButton;

    /**
 * Initiate U2F Sign.
 */
  private void doU2f() {
        displayMessage("Sign In canceled."mU2fSign.u2fSign(U2F_SERVER_URL, mUsernameView.getText().toString());
    }

    /**
 * AnThe errorU2F occurredSign duringwas processingsuccessful.
 *Now 
go * @param errorMessage The error that occurredto the desired activity.
 */
  @Override
   public void u2fSignErrorgotoTargetActivity(CharSequence errorMessage) {
        displayMessage(errorMessageIntent intent = new Intent(this, DemoAppActivity.class);
        enableFormstartActivity(intent);
    }

    @Override/**
 *  protectedThe voiduser onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initUi();
        // Create the U2F Sign object to be used.
  mU2fSignis requesting to use an alternate method for second factor authentication.
 * This alternate method is up to the relying party app.
 */
  @Override
  public void gotoAlternateVerificationActivity() {
        Intent intent = new SurePassIdU2fSignIntent(this, thisDemoCodeActivity.class);
    }
    /**startActivity(intent);
 * Call the U2F}

 Sign's onActivityResult method.
 /** @param requestCode
  * The @paramuser resultCode
aborted  *the @paramsign intentin.
  */
  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent intentu2fSignCanceled() {
        mU2fSign.onActivityResult(requestCode, resultCode, intentdisplayMessage("Sign In canceled.");
    }

    /**
 * Initialize the user interfaceAn error occurred during processing.
 * 
 * @param errorMessage The error that occurred.
 */
  private@Override
  public void initUiu2fSignError(CharSequence errorMessage) {
        mStatusMessageView = (TextView) findViewById(R.id.status_messagedisplayMessage(errorMessage);
    }

    @Override
 mUsernameView protected =void onCreate(EditTextBundle savedInstanceState) findViewById(R.id.username{
        super.onCreate(savedInstanceState);
   
     mPasswordView = (EditText) findViewByIdinitUi(R.id.password);

        mSignInButton// =Create (Button) findViewById(R.id.button_sign_in);
        mSignInButton.setOnClickListener(new View.OnClickListener() {the U2F Sign object to be used.
  mU2fSign = new SurePassIdU2fSign(this, this);
            @Override
  public void onClick(View view) {
                doSignIn();
            }
}

    /**
 * Call the U2F Sign's onActivityResult method.
 * @param requestCode
  * @param resultCode
  * @param intent
  */
  @Override
  public void onActivityResult(int requestCode, int resultCode, Intent intent) {
        mU2fSign.onActivityResult(requestCode, resultCode, }intent);
    }

    /**
 * CalledInitialize when the Sign In button is presseduser interface.
 */
  private void doSignIninitUi() {
         disableForm(mStatusMessageView = (TextView) findViewById(R.id.status_message);
        String usernamemUsernameView = mUsernameView.getText(EditText).toString( findViewById(R.id.username);
        StringmPasswordView password = mPasswordView.getText(EditText).toString( findViewById(R.id.password);

        // Verify username an passwordmSignInButton on server.
  displayMessage= (Button) findViewById(R.stringid.signinbutton_statussign_signing_in);
        mVerifyUsernamePasswordTask = new VerifyUsernamePasswordTaskmSignInButton.setOnClickListener(new AsyncTaskListenerView.OnClickListener() {
            @Override
  public void onAsyncTaskFailonClick(StringView errorMessageview) {
                mPasswordView.requestFocusdoSignIn();
                mPasswordView.selectAll();}
        });
    }

    enableForm();
                displayMessage(errorMessage);/**
 * Called when the Sign In button is pressed.
 */
  private void doSignIn() {
        disableForm();

    }
    String username = mUsernameView.getText().toString();
     /**
 * Called when the username and String password have successfully validated.
 * It then calls U2F Sign.
 */
  @Override
  public void onAsyncTaskSuccess() {= mPasswordView.getText().toString();

        // Verify username an password on server.
        mVerifyUsernamePasswordTask =       Log.v(TAG, "onAsyncTaskSuccess([]): START");new VerifyUsernamePasswordTask(new AsyncTaskListener() {
            @Override
  public void onAsyncTaskFail(String doU2f(errorMessage);
 {
                }mPasswordView.requestFocus();
        });
        mVerifyUsernamePasswordTaskmPasswordView.executeselectAll(username, password);
    }
    protected void displayMessage(int messageId) {
        mStatusMessageView.setTextdisplayMessage(messageIderrorMessage);
    }
    protected void displayMessage(CharSequence message) {}

        mStatusMessageView.setText(message);
    }
    protected void resetFormValues() {
        mUsernameView.requestFocus();
        mUsernameView.setText("");
        mPasswordView.setText("");/**
 * Called when the username and password have successfully validated.
 * It then calls U2F Sign.
 */
  @Override
  public void onAsyncTaskSuccess() {
        mStatusMessageView.setText("");
    }
    private void disableForm() { Log.v(TAG, "onAsyncTaskSuccess([]): START");
        mUsernameView.setEnabled(false);
        mPasswordView.setEnableddoU2f(false);
        mSignInButton.setVisibility(GONE);
    }
    protected   void enableForm(}) {;
        mUsernameViewmVerifyUsernamePasswordTask.setEnabled(trueexecute(username, password);
    }

     mPasswordView.setEnabled(true);protected void displayMessage(CharSequence message) {
        mSignInButtonmStatusMessageView.setVisibilitysetText(VISIBLEmessage);
    }
}