Android studio html view in ArrayList

Question

I am making a math quiz where a mathematical question will be asked in the form of a formula. I put my questions in an ArrayList:

public class DEasy extends AppCompatActivity {

private TextView countLabel;
private TextView questionLabel;
private Button answerBtn1;
private Button answerBtn2;
private Button answerBtn3;
private Button answerBtn4;

private String rightAnswer;
private int rightAnswerCount = 0;
private int quizCount = 1;
static final private int QUIZ_COUNT = 10;

ArrayList<ArrayList<String>> quizArray = new ArrayList<>();
String quizData[][] = {
        {"x", "1", "0", "x", "-1"},
        {"x²", "2x", "x", "2/x²", "2x²"},
        {"64", "0", "1", "64", "8"},
        {"x² + 5x", "2x + 5", "7x", "2x", "½x + 5"},
        {"19x", "19", "x", "0", "x + 19"},
        {"642", "34", "97", "5x-2", "1"}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_deasy);

    countLabel = (TextView) findViewById(R.id.countLabel);
    questionLabel = (TextView) findViewById(R.id.questionLabel);
    answerBtn1 = (Button) findViewById(R.id.answerBtn1);
    answerBtn2 = (Button) findViewById(R.id.answerBtn2);
    answerBtn3 = (Button) findViewById(R.id.answerBtn3);
    answerBtn4 = (Button) findViewById(R.id.answerBtn4);

    for (int i = 0; i < quizData.length; i++) {

        ArrayList<String> tmpArray = new ArrayList<>();
        tmpArray.add(quizData[i][0]);
        tmpArray.add(quizData[i][1]);
        tmpArray.add(quizData[i][2]);
        tmpArray.add(quizData[i][3]);
        tmpArray.add(quizData[i][4]);

        quizArray.add(tmpArray);
    }
    showNextQuiz();
}
public void showNextQuiz() {
    countLabel.setText( getString(R.string.question) + " " + quizCount + ".");

    Random random = new Random();
    int randomNum = random.nextInt(quizArray.size());

    ArrayList<String> quiz = quizArray.get(randomNum);

    questionLabel.setText(quiz.get(0));
    rightAnswer = quiz.get(1);

    quiz.remove(0);
    Collections.shuffle(quiz);

    answerBtn1.setText(quiz.get(0));
    answerBtn2.setText(quiz.get(1));
    answerBtn3.setText(quiz.get(2));
    answerBtn4.setText(quiz.get(3));

    quizArray.remove(randomNum);
}
public void checkAnswer(View view){
    Button answerBtn = (Button) findViewById(view.getId());
    String btnText = answerBtn.getText().toString();

    String alertTitle;

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

    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) {
            if (quizCount == QUIZ_COUNT){
                Intent intent = new Intent(getApplicationContext(), DResult.class);
                intent.putExtra("RIGHT_ANSWER_COUNT", rightAnswerCount);
                startActivity(intent);

            }
            else{
                quizCount++;
                showNextQuiz();
            }
        }
    });
    builder.setCancelable(false);
    builder.show();
}

} As you can see I tried to make the formula x^2, this wil not be shown as x with a small exponent 2 but as x^2. This x^2 is not what I want. How can I used for example html in this arraylist to achieve this goal. Or is there another way?

Thanks aton!

Ankit Patidar · Accepted Answer · 2017-11-30 22:59:08Z

1

Here in replacement of "^" we can use this: "∧".

So now replace code at where you accessing this string array in Adapter as:

  Html.fromHtml(quizArray[][])

Thanks and happy coding

EDITED:

Here change it as:

   questionLabel.setText(Htm.fromHtml(quiz.get(0)));

Just it will work

edited Nov 30, 2017 at 22:59

answered Nov 30, 2017 at 22:10

Ankit Patidar

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3 Comments

100Awesome Over a year ago

Thanks alot for helping me out. However, I am new to coding (started this week) and this piece is copied from a video. I myself am not able to fully create something this complex on my own yet. I do not know where I have to put the code you sugested me, Here is my entire java file

Ankit Patidar Over a year ago

Where is java file

100Awesome Over a year ago

Thanks alot, I managed to implement this in my code succesfully and accepted the answer. I also asked another question on the forum. I would be so grateful if you could help me out once again stackoverflow.com/questions/47618227/…

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