錯誤的答案是正確的Android測驗應用程序

Question

我想開發一個測驗應用程序，我手動編寫問題和答案的數組，然後使用它們來設置單選按鈕和文本視圖的文本值。但是，當我嘗試運行並使用它時，在第一組問題中，沒有問題，接下來正確答案變得不正確，反之亦然。下面的屏幕截圖。

正確的一個，當我按下正確的一個。

​​

不正確的一個，但我已經按下了正確的（你知道答案）。

在我看來，第一組問題的價值觀並沒有移動。我嘗試了所有我能想到但沒有運氣的東西。當我試圖打印出當前文本時，我看到了logcat中會發生什麼。這是我的logcat的一個片段。

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 

下面是該部分的代碼。

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; 
} 

這就是我現在所擁有的。讓我知道如果你需要澄清因爲我的英語不是那麼好。提前致謝。

Answer 1

在顯示第一個問題之後，您將保存Button s的初始文本作爲答案，但當您轉到下一個問題時它們不會更新。

您需要點擊時獲取Button的當前文字。在onClick()方法checkAnswers()的調用更改爲checkAnswers(choiceBtnA.getText().toString());，checkAnswers(choiceBtnB.getText().toString());等

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

此外，你可以修剪下來的代碼一點通過傳遞代表Button的指數的int爲checkAnswers()代替，只是搶選擇的答案出現。

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; 
    ... 
}