Hello , please help me, I don’t know to solve my code problem about fragments , it is said that the fragments must be static

[Rmintender]

public OnClickListener guessButtonListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        Button guessButton = ((Button) v);
        String guess = guessButton.getText().toString();
        String answer = getCountryName(correctAnswer);
        ++totalGuesses; // increment number of guesses the user has made

        if (guess.equals(answer)) { // if the guess is correct
            ++correctAnswers; // increment the number of correct answers

            // display correct answer in green text
            answerTextView.setText(answer);


            disableButtons(); // disable all guess Buttons

            // if the user has correctly identified FLAGS_IN_QUIZ flags
            if (correctAnswers == FLAGS_IN_QUIZ) {
                // DialogFragment to display quiz stats and start new quiz
                DialogFragment quizResults =
                        new DialogFragment() {
                            // create an AlertDialog and return it
                            @Override
                            public Dialog onCreateDialog(Bundle bundle) {
                                AlertDialog.Builder builder =
                                        new AlertDialog.Builder(getActivity());
                                builder.setMessage(
                                        getString(R.string.results,
                                                totalGuesses,
                                                (1000 / (double) totalGuesses)));

                                // "Reset Quiz" Button
                                builder.setPositiveButton(R.string.reset_quiz,
                                        new DialogInterface.OnClickListener() {
                                            public void onClick(DialogInterface dialog,
                                                                int id) {
                                                resetQuiz();
                                            }
                                        }
                                );

                                return builder.create(); // return the AlertDialog
                            }
                        };

[Rmintender]

[paulsoja]

public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("Важное сообщение!")
.setMessage("Покормите кота!")
.setIcon(R.drawable.ic_launcher_cat)
.setPositiveButton("ОК", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
return builder.create();
}