如何在Java中选中不同的单选按钮时显示不同的消息？

Question

我想在选中第一个单选按钮时显示 "You clicked the wrong answer"，在选中第二个单选按钮时显示 "You clicked the correct answer"。使用此代码，我得到一个错误：Cannot resolve symbol 'CorrectAnswer'。 bariable CorrectAnswer 是数据库查询的结果。这是我的代码：

    radioGroup = new RadioGroup[2];
    answer = new RadioButton[2];
    int i = 0;
    for (Question qn : questions) {
        radioGroup[i] = new RadioGroup(this);
        int j = 0;
        for (Answer an : answers) {
            if (qn.getID() == an.getQuestion_id_answer()) {
                String answers_log = " " + an.getAnswer();
                Integer CorrectAnswer = an.getCorrect_answer();
                answer[j] = new RadioButton(this);
                answer[j].setText(answers_log);
                radioGroup[i].addView(answer[j]);
                j++;
            }
        }
        linearLayout.addView(radioGroup[i]);

        radioGroup[i].setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch (checkedId) {
                    case 0:
                        if (CorrectAnswer == 1) {
                            Toast.makeText(getApplicationContext(), "You clicked the correct answer ", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(getApplicationContext(), "You clicked the incorrect answer ", Toast.LENGTH_SHORT).show();
                        }
                        break;
                    case 1:
                        if (CorrectAnswer == 1) {
                            Toast.makeText(getApplicationContext(), "You clicked the correct answer ", Toast.LENGTH_SHORT).show();
                        } else {
                            Toast.makeText(getApplicationContext(), "You clicked the incorrect answer ", Toast.LENGTH_SHORT).show();
                        }
                        break;
                }
            }
        });
        i++;
    }

数据库结构是这样的：

         db.addAnswer(new Answer("NY", 3, 0));
         db.addAnswer(new Answer("WA", 3, 1));

如您所见，在第三列中我有 1，这意味着第二个答案是正确的。
谢谢！

Answer 1

i get an error: Cannot resolve symbol 'CorrectAnswer'

因为 CorrectAnswer 变量不在尝试访问它的方法范围内。

要么将其声明为全局变量，要么使用 RadioButton 的 setTag/getTag 来获取 onCheckedChanged

中的 CorrectAnswer 值

我认为使用 setTag/getTag 方法将 CorrectAnswer 设置为：

1. 首先用 RadioButton 保存值使用 setTag:

answer[j] = new RadioButton(this);
  answer[j].setTag(String.valueOf(an.getCorrect_answer()));
  answer[j].setText(answers_log);

2. 在onCheckedChanged get selected RadioButton value as:

 @Override
  public void onCheckedChanged(RadioGroup group, int checkedId) {
    RadioButton checkedRadioButton = (RadioButton)group.findViewById(checkedId);
    int  CorrectAnswer=Integer.parseInt(checkedRadioButton.getTag().toString());
    ....your code here...
  }

如何在Java中选中不同的单选按钮时显示不同的消息？

How to display different messages when different radio buttons are checked in Java?

java

android

if-statement

for-loop

changelistener