问Android对话框关闭而不是取消

EN

public AuthDialog(final Context context, OnDismissListener dismissListener, OnCancelListener cancelListener) {
    super(context);
    setOnDismissListener(dismissListener);
    setOnCancelListener(cancelListener);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.userpassdialog);
    setTitle("Enter email and password");
    setCancelable(true);
    setCanceledOnTouchOutside(true);
    authEmail = (EditText) findViewById(R.id.authEmail);
    authPass = (EditText) findViewById(R.id.authPass);
    alertMessage = (TextView) findViewById(R.id.auth_alert);
    Button authButton = (Button) findViewById(R.id.authButton);
    View.OnClickListener onClickListener = new View.OnClickListener() {
        public void onClick(View v) {
            if (checkCredentials())
                dismiss();
            else
                showAlert();
        }
    };
    authButton.setOnClickListener(onClickListener);
}

private void showAlert() {
    alertMessage.setText("Wrong user/pass");
    authEmail.setText(null);
    authPass.setText(null);
}

private boolean checkCredentials() {
    // Empty user/pass for now
    boolean checkEmail = authEmail.getText().toString().equals("");
    boolean checkPassword = authPass.getText().toString().equals("");
    return checkEmail && checkPassword;
}

@Override
public void onBackPressed() {
    cancel();
}

private void authenticateThenAccept() {
    OnDismissListener dismissListener = new OnDismissListener() {
        @Override
        public void onDismiss(DialogInterface dialog) {
            accept();
        }
    };
    OnCancelListener cancelListener = new OnCancelListener() {
        @Override
        public void onCancel(DialogInterface dialog) {
            cancel();
        }
    };
    AuthDialog dialog = new AuthDialog(context, dismissListener, cancelListener);
    dialog.show();
}