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我正在尝试为 android 创建一个随机多项选择测验。我想显示一个字符串数组中的随机问题,另一个字符串数组中的相应答案显示在四个选项之一中。其他三个选项将来自另一个字符串数组,该数组将用于随机提供所有问题的“错误”答案。

两个问题:有没有更好的方法来进行这样的多项选择测验?-and- 当玩家选择答案时,我如何识别答案来自哪个数组?

这是我用来随机化的代码:

String[] question = { //questions here// };  
ArrayList<String> questionList = new ArrayList(Arrays.asList(question));  

String[] answer = { //answers here// };  
ArrayList<String> answerList = new ArrayList(Arrays.asList(answer));

String[] distractor = { //distractors here// };  
ArrayList<String> distractorList = new ArrayList(Arrays.asList(distractor));  

int i = 0;  
Random r = new Random();  
public void randomize() {

        TextView word = (TextView) findViewById(R.id.textView1);
        TextView choice1 = (TextView) findViewById(R.id.textView2);
        TextView choice2 = (TextView) findViewById(R.id.textView3);
        TextView choice3 = (TextView) findViewById(R.id.textView4);
        TextView choice4 = (TextView) findViewById(R.id.textView5);
        if (i < question.length) {
            int remaining = r.nextInt(questionList.size());
            String q = questionList.get(remaining);
            word.setText(q);
            questionList.remove(remaining);
            String a = answerList.get(remaining);
            int slot = r.nextInt(4);
            TextView[] tvArray = { choice1, choice2, choice3, choice4 };
            tvArray[slot].setText(a);
            answerList.remove(remaining);
          //an if/else statement here to fill the remaining slots with distractors
4

2 回答 2

4

我建议创建一个名为 QuestionAndAnswer 的新类。该类应该保存问题和正确答案,它还可以保存任何自定义的错误答案和用户的选择。确切的实施完全取决于您。

在您的 Activity 中有一个此 QuestionAndAnswer 类的数组,以循环浏览列表,询问问题并在完成后计算分数。

(如果您包含您尝试过的相关代码,我可能会更具体。)


添加

这就是我要开始的内容:(
从您的代码中,我猜测其中distractorList包含您要显示的错误答案。)

public class QuestionAndAnswer {
    public List<String> allAnswers; // distractors plus real answer
    public String answer;
    public String question;
    public String selectedAnswer;
    public int selectedId = -1;

    public QuestionAndAnswer(String question, String answer, List<String> distractors) {
        this.question = question;
        this.answer = answer;
        allAnswers = new ArrayList<String> (distractors);

        // Add real answer to false answers and shuffle them around 
        allAnswers.add(answer);
        Collections.shuffle(allAnswers);
    }

    public boolean isCorrect() {
        return answer.equals(selectedAnswer);
    }
}

对于 Activity,我将您的四个答案 TextViews 更改为 RadioGroup,这样用户可以直观地选择答案。我还假设会有prevnext按钮,它们会调整int currentQuestion和调用fillInQuestion()

public class Example extends Activity {
    RadioGroup answerRadioGroup;
    int currentQuestion = 0;
    TextView questionTextView;
    List<QuestionAndAnswer> quiz = new ArrayList<QuestionAndAnswer>();

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        questionTextView = (TextView) findViewById(R.id.question);
        answerRadioGroup = (RadioGroup) findViewById(R.id.answers);

        // Setup a listener to save chosen answer
        answerRadioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                if(checkedId > -1) {
                    QuestionAndAnswer qna = quiz.get(currentQuestion);
                    qna.selectedAnswer = ((RadioButton) group.findViewById(checkedId)).getText().toString();
                    qna.selectedId = checkedId;
                }
            }
        });

        String[] question = { //questions here// };  
        String[] answer = { //answers here// };  
        String[] distractor = { //distractors here// };  
        ArrayList<String> distractorList = Arrays.asList(distractor);  

        /* I assumed that there are 3 distractors per question and that they are organized in distractorList like so:
         *   "q1 distractor 1", "q1 distractor 2", "q1 distractor 3", 
         *   "q2 distractor 1", "q2 distractor 2", "q2 distractor 3",
         *   etc
         *   
         * If the question is: "The color of the sky", you'd see distractors:
         *   "red", "green", "violet"
         */   
        int length = question.length;
        for(int i = 0; i < length; i++)
            quiz.add(new QuestionAndAnswer(question[i], answer[i], distractorList.subList(i * 3, (i + 1) * 3)));
        Collections.shuffle(quiz);

        fillInQuestion();
    }

    public void fillInQuestion() {
        QuestionAndAnswer qna = quiz.get(currentQuestion);
        questionTextView.setText(qna.question);

        // Set all of the answers in the RadioButtons 
        int count = answerRadioGroup.getChildCount();
        for(int i = 0; i < count; i++)
            ((RadioButton) answerRadioGroup.getChildAt(i)).setText(qna.allAnswers.get(i));

        // Restore selected answer if exists otherwise clear previous question's choice
        if(qna.selectedId > -1)
            answerRadioGroup.check(qna.selectedId);
        else 
            answerRadioGroup.clearCheck();
    }
}

您可能已经注意到 QuestionAndAnswer 有一个 isCorrect() 方法,当需要给测验评分时,您可以像这样计算正确答案:

int correct = 0;
for(QuestionAndAnswer question : quiz)
    if(question.isCorrect())
        correct++;

这是我的一般想法。代码是一个完整的想法,所以它会编译。当然,您需要添加一个“下一步”按钮来查看不同的问题。但这足以让您看到一种在保持问题和答案井井有条的同时随机化问题和答案的方法。

于 2012-08-15T16:11:56.280 回答
1

这里有一个样本,你可以试试。这是一个数据模型,喜欢为问答事物保存东西。

<data-map>
    <question id="1">
        <ask>How many questions are asked on Android category daily? </ask>
        <answer-map>
            <option id="1">100 </option>
            <option id="2">111 </option>
            <option id="3">148 </option>
            <option id="4">217 </option>
        </answer-map>
        <correct id="3" />
    </question>


    <question id="2">
        <ask>Which band does John Lenon belong to? </ask>
        <answer-map>
            <option id="1">The Carpenters </option>
            <option id="2">The Beatles </option>
            <option id="3">Take That </option>
            <option id="4">Queen </option>
        </answer-map>
        <correct id="2" />
    </question>

</data-map>

好的,所以你每次显示一个问题时,你都有所有要回答的选项,以及每个问题的正确答案。只需创建一个适当的数据结构来保存它们。无论如何,只是一个样本,不是一个完美的,但如果你对这些东西不熟悉,请尝试一下^^!

于 2012-08-15T16:16:32.540 回答