Saving ArrayList Data on Android

How can I return to the last question asked in the following code when the application is closed and opened.
I tried to save the arraylist with gson but it does not happen, adding a button also gives an error.
Thanks to you all for your help now.
arraylist got to save with sharedpreferences
because i think sharedpreferences easy than sqlite or another ways

private TextView countLabel;
private ImageView questionImage;
private EditText editText;

private String rightAnswer;
private int rightAnswerCount = 0;
private int quizCount = 1;

ArrayList<ArrayList<String>> quizArray = new ArrayList<>();

String quizData[][] = {
        // {"Image Name", "Right Answer"}
        {"image_circle", "circle"},
        {"image_triangle", "triangle"},
        {"image_square", "square"},
        {"image_pentagon", "pentagon"},
        {"image_hexagon", "hexagon"},
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    countLabel = findViewById(R.id.countLabel);
    questionImage = findViewById(R.id.questionImage);
    editText = findViewById(R.id.editText);

    editText.setOnKeyListener(new View.OnKeyListener() {
        @Override
        public boolean onKey(View view, int keyCode, KeyEvent keyEvent) {

            if (keyEvent.getAction() == KeyEvent.ACTION_DOWN) {

                if (keyCode == KeyEvent.KEYCODE_ENTER) {
                    checkAnswer();
                }

            }

            return false;
        }
    });

    // Create quizArray from quizData.
    for (int i = 0; i < quizData.length; i++) {

        // Prepare array.
        ArrayList<String> tmpArray = new ArrayList<>();
        tmpArray.add(quizData[i][0]); // Image Name
        tmpArray.add(quizData[i][1]); // Right Answer

        // Add tmpArray to quizArray.
        quizArray.add(tmpArray);

    }

    showNextQuiz();
}

public void showNextQuiz() {

    // Update quizCountLabel.
    countLabel.setText("Q" + quizCount);

    // Generate random number between 0 and 4 (quizArray's size -1)
    Random random = new Random();
    int randomNum = random.nextInt(quizArray.size());

    // Pick one quiz set.
    ArrayList<String> quiz = quizArray.get(randomNum);

    // Set image and right answer.
    // Array format: {"Image Name", "Right Answer"}
    questionImage.setImageResource(
            getResources().getIdentifier(quiz.get(0), "drawable", getPackageName()));
    rightAnswer = quiz.get(1);

    // Remove this quiz from quizArray.
    quizArray.remove(randomNum);
}


public void checkAnswer() {

    // Get editText.
    String answer = editText.getText().toString().toLowerCase();

    String alertTitle;

    if (answer.equals(rightAnswer)) {
        // Correct!
        alertTitle = "Correct!";
        rightAnswerCount++;
    } else {
        // Wrong...
        alertTitle = "Wrong...";
    }

    // Create Dialog.
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(alertTitle);
    builder.setMessage("Answer : " + rightAnswer);
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {

            editText.setText("");

            if (quizArray.size() < 1) {
                // quizArray is empty.
                showResult();

            } else {
                quizCount++;
                showNextQuiz();
            }

        }
    });
    builder.setCancelable(false);
    builder.show();
}

public void showResult() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Result");
    builder.setMessage(rightAnswerCount + " / 5");
    builder.setPositiveButton("Try Again", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            recreate();
        }
    });
    builder.setNegativeButton("Quit", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialogInterface, int i) {
            finish();
        }
    });
    builder.show();
}

}

Thanks to you all for your help now.