我正在尝试开发一个测验应用程序，我在其中手动编写一系列问题和答案，然后使用它们来设置单选按钮和 TextView 的文本值。但是，当我尝试运行它并使用它时，在第一组问题中，它很好，然后正确答案变得不正确，反之亦然。截图如下。
当我按正确的那个时是正确的。
不正确的，但我按了正确的(你知道答案)。
在我看来，第一组问题的值没有被移动。我尝试了我能想到的一切，但没有运气。当我试图打印出当前文本时，我看到我的 logcat 中发生了什么。这是我的 logcat 中的一个 fragment 。
04-24 01:56:10.880 4093-4093/com.example.muhammad.exquizme D/answer: Google
04-24 01:56:10.880 4093-4093/com.example.muhammad.exquizme D/correctAnswer: Google
04-24 01:56:10.885 4093-4093/com.example.muhammad.exquizme D/Is it correct?: Correct
04-24 01:56:10.894 4093-4147/com.example.muhammad.exquizme W/OpenGLRenderer: Fail to change FontRenderer cache size, it already initialized
04-24 01:56:32.322 4093-4093/com.example.muhammad.exquizme D/answer: Google
04-24 01:56:32.322 4093-4093/com.example.muhammad.exquizme D/correctAnswer: An algorithm
04-24 01:56:32.326 4093-4093/com.example.muhammad.exquizme D/Is it correct?: Incorrect
这是该部分的代码。
QuizQuestion[] questionArray; //global variable
int randomIndex;//global variable
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_play_quiz);
qIndexView = (TextView) findViewById(R.id.currentNumber);
questionTextView = (TextView) findViewById(R.id.questionTextView);
choiceBtnA = (RadioButton) findViewById(R.id.choiceA);
choiceBtnB = (RadioButton) findViewById(R.id.choiceB);
choiceBtnC = (RadioButton) findViewById(R.id.choiceC);
choiceBtnD = (RadioButton) findViewById(R.id.choiceD);
questionArray = new QuizQuestion[5];
displayQuestion();
final String a = choiceBtnA.getText().toString();
final String b = choiceBtnB.getText().toString();
final String c = choiceBtnC.getText().toString();
final String d = choiceBtnD.getText().toString();
choiceBtnA.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkAnswers(a);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
displayQuestion();
}
}, 2000);
//displayQuestion();
}
});
choiceBtnB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkAnswers(b);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
displayQuestion();
}
}, 2000);
}
});
choiceBtnC.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkAnswers(c);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
displayQuestion();
}
}, 2000);
}
});
choiceBtnD.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkAnswers(d);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
displayQuestion();
}
}, 2000);
}
});
}
//This is called every pressed
public void displayQuestion() {
//Create Question list
String theQuestion = "Android mobile operating system was released on 23rd September 2008 developed by who?";
String[] choices = new String[]{"Google", "IBM", "Intel", "Oracle"};
questionArray[0] = new QuizQuestion(theQuestion, choices, choices[0], "Computing History");
theQuestion = "Who invented the programming language called 'Java'?";
choices = new String[]{"James Gosling", "Steve Jobs", "Bill Gates", "Elon Musk"};
questionArray[1] = new QuizQuestion(theQuestion, choices, choices[0], "Computing History");
theQuestion = "Which of the following languages is more suited to a structured program?";
choices = new String[]{"FORTRAN", "BASIC", "PASCAL", "None of the above"};
questionArray[2] = new QuizQuestion(theQuestion, choices, choices[3], "Computer Fundamentals");
theQuestion = "The brain of any computer system is";
choices = new String[]{"Memory", "ALU", "CPU", "Control unit"};
questionArray[3] = new QuizQuestion(theQuestion, choices, choices[2], "Computer Fundamentals");
theQuestion = "The step-by-step instructions that solve a problem are called _____.";
choices = new String[]{"An algorithm", "A list", "A plan", "A sequential structure"};
questionArray[4] = new QuizQuestion(theQuestion, choices, choices[0], "System Analysis and Design");
randomIndex = new Random().nextInt(questionArray.length);
questionTextView.setText(questionArray[randomIndex].question);
choiceBtnA.setText(questionArray[randomIndex].choices[0]);
choiceBtnB.setText(questionArray[randomIndex].choices[1]);
choiceBtnC.setText(questionArray[randomIndex].choices[2]);
choiceBtnD.setText(questionArray[randomIndex].choices[3]);
}
//checks answer when clicked
public boolean checkAnswers(String answer) {
Log.d("answer", answer);
String correctAnswer = questionArray[randomIndex].answer;
Log.d("correctAnswer", correctAnswer);
if (answer.equals(correctAnswer)) {
Toast.makeText(PlayQuizActivity.this, "Correct", Toast.LENGTH_SHORT).show();
Log.d("Is it correct?", "Correct");
return true;
} else {
Toast.makeText(PlayQuizActivity.this, "Incorrect", Toast.LENGTH_SHORT).show();
Log.d("Is it correct?", "Incorrect");
}
return false;
}
这就是我目前的全部。如果您需要澄清，请告诉我，因为我的英语不是很好。提前致谢。
最佳答案
显示第一个问题后，您将 Button 的初始文本保存为答案，但当您转到下一个问题时它们不会更新。
您需要在单击时获取 Button 的当前文本。将 onClick() 方法中对 checkAnswers() 的调用更改为 checkAnswers(choiceBtnA.getText().toString());, checkAnswers(choiceBtnB.getText().toString());等
或者，您可以从 questionArray 中获取答案 String。例如，checkAnswers(questionArray[randomIndex].choices[0]);、checkAnswers(questionArray[randomIndex].choices[1]);等
此外，您可以通过将表示 Button 索引的 int 传递给 checkAnswers() 来稍微精简代码，并在那里获取选定的答案。
choiceBtnA.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
checkAnswers(0);
...
}
});
...
public boolean checkAnswers(int index) {
String answer = questionArray[randomIndex].choices[index];
String correctAnswer = questionArray[randomIndex].answer;
...
}
关于java - 答案正确时不正确 Android 测验应用程序，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36818202/