我无法解决以下问题:
我正在制作一个小测验Android应用程序。我有一个QuizActivity和一个QuizFragment,我在活动中构建了一个QuizFragments列表:
questionFragments = new ArrayList<>();
questionFragments.add(QuestionFragment.newInstance(new Question("Amai menne ...",
new ArrayList<Answer>() {{
add(new Answer("Frak", false));
add(new Answer("Jas", true));
add(new Answer("Bernadette", false));
}})));
questionFragments.add(QuestionFragment.newInstance(new Question("Question 2",
new ArrayList<Answer>() {{
add(new Answer("Answer 1", false));
add(new Answer("Answer 2", true));
}})));
我在活动中有一个替换当前QuestionFragment的方法:
private void showQuestion(int question) {
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.content_quiz_fl_question, questionFragments.get(question));
transaction.commit();
}
QuestionActivity中的回调:
@Override
public void onCorrectAnswerSelected() {
showQuestion(currentQuestion + 1);
}
在我的QuestionFragment中,我以编程方式构建RadioGroup(OnCreateView):
radioGroup = new RadioGroup(getContext());
radioGroup.setOrientation(RadioGroup.VERTICAL);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.BELOW, R.id.fragment_question_tv_title);
radioGroup.setLayoutParams(lp);
for (Answer answer : question.getAnswers()) {
RadioButton radioButton = new RadioButton(getContext());
radioButton.setText(answer.getAnswer());
radioButton.setPadding(0, 30, 0, 30);
radioGroup.addView(radioButton);
}
我在片段的按钮上有一个监听器:
verifyAnswer.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
int checkedRadioButtonId = radioGroup.getCheckedRadioButtonId();
if (question.getAnswers().get(checkedRadioButtonId - 1).isCorrect()) {
//Correct
handleSuccess();
} else {
//Incorrect
handleFailure();
}
}
});
现在这是我遇到问题的地方,当我回答第一个问题时,一切都按计划进行,但当我回答第二个问题时,应用程序崩溃了。我能够在调试的帮助下查明问题。 我好像是RadioGroup&#34;记得&#34;以前问题的可能答案(在这种情况下,我从第二个问题中选择了第二个选项)。您可以在下面看到所选的radioButtonId为5,但我只有2个单选按钮:
我将不胜感激任何帮助!源代码:https://github.com/Jdruwe/ElineBirthday
答案 0 :(得分:1)
显然,您需要执行以下操作才能获取所选RadioButton(How to get the selected index of a RadioGroup in Android)的索引:
int radioButtonID = radioGroup.getCheckedRadioButtonId();
View radioButton = radioGroup.findViewById(radioButtonID);
int idx = radioGroup.indexOfChild(radioButton);