如何实时更新值从API获取的值

Question

i制作一个测验应用程序，其中我要显示问题，并且是无线电按钮中的四个选项，我想通过单击时将其更新为下一个ID问题，将其一个一个更新到下一个ID问题。按钮.....我应该怎么做？而且，我应该如何检查得分的分数，该分数要在下一个我将要进行的活动中显示？该应用在按钮

的列表上崩溃

预先感谢！

quizactivity：

public class Quiz extends AppCompatActivity {
    RadioGroup radioGroup;
    RadioButton optionOne,optionTwo,optionThree,optionFour;
    private TextView questionName;
    String question_name;
    String option1,option2,option3,option4;
    Button next_question;
    int first_question_index=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_quiz);
        questionName=(TextView)findViewById(R.id.question_name);
        radioGroup =(RadioGroup)findViewById(R.id.radioGroup);
        optionOne=(RadioButton)findViewById(R.id.answerOne);
        optionTwo=(RadioButton)findViewById(R.id.answerOne);
        optionThree=(RadioButton)findViewById(R.id.answerOne);
        optionFour=(RadioButton)findViewById(R.id.answerOne);
        next_question=(Button)findViewById(R.id.button_next_question);
        FetchLists fetchLists =new FetchLists();
        fetchLists.execute(10,0);
        next_question.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                first_question_index++;
            }
        }); }
    public class FetchLists extends AsyncTask<Integer, Void, String> {
        @Override
        protected String doInBackground(Integer... params) {

            String urlString = "http://aptronnoida.com/Aditya_July4/Demo/JAVA_FETCH.php";

            try {
                URL url = new URL(urlString);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                InputStream stream = connection.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
                String line = reader.readLine();
                String response = "";
                while (line != null) {
                    response += line;
                    line = reader.readLine();
                }
                JSONObject object = new JSONObject(response);
                JSONArray jsonArray = object.getJSONArray("data");
                    JSONObject list = (JSONObject) jsonArray.get(first_question_index);
                    question_name= list.getString("Question");
                    option1=list.getString("A1");
                    option2=list.getString("A2");
                    option3=list.getString("A3");
                    option4=list.getString("A4");
            } catch (Exception e) {
                e.printStackTrace();
            }
            return "quiz";
        }
        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);
            questionName.setText(question_name);
            ((RadioButton) radioGroup.getChildAt(0)).setText(option1);
            ((RadioButton) radioGroup.getChildAt(1)).setText(option2);
            ((RadioButton) radioGroup.getChildAt(2)).setText(option3);
            ((RadioButton) radioGroup.getChildAt(3)).setText(option4);


        }
    }
}

Answer 1

public class Quiz extends AppCompatActivity {
    RadioGroup radioGroup;
    RadioButton optionOne,optionTwo,optionThree,optionFour;
    private TextView questionName;
    String question_name;
    String option1,option2,option3,option4;
    Button next_question;
    int first_question_index=0;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_quiz);
        questionName=(TextView)findViewById(R.id.question_name);
        radioGroup =(RadioGroup)findViewById(R.id.radioGroup);
        optionOne=(RadioButton)findViewById(R.id.answerOne);
        optionTwo=(RadioButton)findViewById(R.id.answerOne);
        optionThree=(RadioButton)findViewById(R.id.answerOne);
        optionFour=(RadioButton)findViewById(R.id.answerOne);
        next_question=(Button)findViewById(R.id.button_next_question);

        next_question.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                first_question_index++;
                FetchLists fetchLists = new FetchLists();
                fetchLists.execute(10, 0);
            }
        });

        FetchLists fetchLists = new FetchLists();
        fetchLists.execute(10, 0);
    }
    public class FetchLists extends AsyncTask<Integer, Void, String> {
        @Override
        protected String doInBackground(Integer... params) {

            String urlString = "http://aptronnoida.com/Aditya_July4/Demo/JAVA_FETCH.php";

            try {
                URL url = new URL(urlString);
                HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                connection.setRequestMethod("GET");
                InputStream stream = connection.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
                String line = reader.readLine();
                String response = "";
                while (line != null) {
                    response += line;
                    line = reader.readLine();
                }
                JSONObject object = new JSONObject(response);
                JSONArray jsonArray = object.getJSONArray("data");
                    JSONObject list = (JSONObject) jsonArray.get(first_question_index);
                    Log.d("ashu","JsonObject   "+list);

                    question_name= list.getString("Question");
                    option1=list.getString("A1");
                    option2=list.getString("A2");
                    option3=list.getString("A3");
                    option4=list.getString("A4");
            } catch (Exception e) {
                e.printStackTrace();
            }
            return "quiz";
        }
        @Override
        protected void onPostExecute(String result) {
            super.onPostExecute(result);

            questionName.setText(question_name);
            ((RadioButton) radioGroup.getChildAt(0)).setText(option1);
            ((RadioButton) radioGroup.getChildAt(1)).setText(option2);
            ((RadioButton) radioGroup.getChildAt(2)).setText(option3);
            ((RadioButton) radioGroup.getChildAt(3)).setText(option4);


        }
    }
}