[英]Android Development. RadioButton keeps unselecting
我正在構建一個小測驗應用,假設在問題1上,我選擇選項B,然后提交,測驗給了我下一個問題。 但是對於問題2,如果我嘗試選擇B,則RadioButton會自動取消選中它,並且它是完全不可選中的,直到我選擇另一個單選按鈕,然后再次嘗試B。 該模式是,無論我在上一個問題中選擇的選項如何,在下一個問題中都無法選中該模式,除非我單擊其他單選按鈕然后重試。 我正在附上我的代碼。 有什么幫助嗎?
公共類MainActivity擴展了AppCompatActivity {
QuestionBank allQuestions = new QuestionBank();
String pickedAnswer = "", correctAnswer = "";
final int numberOfQuestions = allQuestions.list.size();
int questionNumber = 0;
boolean noSelection = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
nextQuestion();
}
private void nextQuestion() {
if (questionNumber <= numberOfQuestions - 1) {
TextView questionLabel = (TextView) findViewById(R.id.question_text_view);
String fullQuestion = allQuestions.list.get(questionNumber).questionSet.get("question").toString();
fullQuestion += "\n\na) " + allQuestions.list.get(questionNumber).questionSet.get("a");
fullQuestion += "\nb) " + allQuestions.list.get(questionNumber).questionSet.get("b");
fullQuestion += "\nc) " + allQuestions.list.get(questionNumber).questionSet.get("c");
fullQuestion += "\nd) " + allQuestions.list.get(questionNumber).questionSet.get("d");
correctAnswer = allQuestions.list.get(questionNumber).questionSet.get("answer").toString();
questionLabel.setText(fullQuestion);
questionNumber++;
} else {
restart();
}
}
public void getSelectedAnswer() {
RadioButton radio_1 = (RadioButton) findViewById(R.id.option1_button);
RadioButton radio_2 = (RadioButton) findViewById(R.id.option2_button);
RadioButton radio_3 = (RadioButton) findViewById(R.id.option3_button);
RadioButton radio_4 = (RadioButton) findViewById(R.id.option4_button);
if (radio_1.isChecked()) {
pickedAnswer = "a";
radio_1.setChecked(false);
} else if (radio_2.isChecked()) {
pickedAnswer = "b";
radio_2.setChecked(false);
} else if (radio_3.isChecked()) {
pickedAnswer = "c";
radio_3.setChecked(false);
} else if (radio_4.isChecked()) {
pickedAnswer = "d";
radio_4.setChecked(false);
} else {
noSelection = true;
}
}
public void submitAnswer(View view) {
getSelectedAnswer();
if (noSelection) {
AlertDialog.Builder a_builder = new AlertDialog.Builder(this);
a_builder.setMessage("Please select an answer!");
a_builder.show();
noSelection = false;
} else {
checkAnswer();
nextQuestion();
}
}
public void checkAnswer() {
if (correctAnswer == pickedAnswer) {
AlertDialog.Builder a_builder = new AlertDialog.Builder(this);
a_builder.setMessage("Right Answer!");
a_builder.show();
} else {
AlertDialog.Builder a_builder = new AlertDialog.Builder(this);
a_builder.setMessage("Wrong Answer!");
a_builder.show();
}
pickedAnswer = "";
correctAnswer = "";
}
public void restart() {
questionNumber = 0;
//Collections.shuffle(allQuestions.list);
nextQuestion();
}
}
在提交之后或顯示下一個問題之前,在所有按鈕上調用setChecked(false)
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.