错误的答案是正确的Android测验应用程序

Question

我想开发一个测验应用程序，我手动编写问题和答案的数组，然后使用它们来设置单选按钮和文本视图的文本值。但是，当我尝试运行并使用它时，在第一组问题中，没有问题，接下来正确答案变得不正确，反之亦然。下面的屏幕截图。

正确的一个，当我按下正确的一个。

​​

不正确的一个，但我已经按下了正确的（你知道答案）。

在我看来，第一组问题的价值观并没有移动。我尝试了所有我能想到但没有运气的东西。当我试图打印出当前文本时，我看到了logcat中会发生什么。这是我的logcat的一个片段。

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 

下面是该部分的代码。

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; 
} 

这就是我现在所拥有的。让我知道如果你需要澄清因为我的英语不是那么好。提前致谢。

Answer 1

在显示第一个问题之后，您将保存Button s的初始文本作为答案，但当您转到下一个问题时它们不会更新。

您需要点击时获取Button的当前文字。在onClick()方法checkAnswers()的调用更改为checkAnswers(choiceBtnA.getText().toString());，checkAnswers(choiceBtnB.getText().toString());等

或者，你可以从questionArray得到答案，而不是String。例如，checkAnswers(questionArray[randomIndex].choices[0]);，checkAnswers(questionArray[randomIndex].choices[1]);等

此外，你可以修剪下来的代码一点通过传递代表Button的指数的int为checkAnswers()代替，只是抢选择的答案出现。

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; 
    ... 
}