Android ArrayList Shuffle

Question

我有一個ArrayList>我從PHP 這裏存儲我的提問者它看起來像{{question，optA，optB，optC，optD，answer}，{question，optA，optB，optC，optD，answer} ，.....}}

我該如何洗牌只有我的A，B，C，D像D，B，A，C？ {問題，optD，optB，OPTA，OPTC，回答}使用

林這段代碼

//myArray 
     ArrayList<ArrayList<String>> getQuestion = new ArrayList<ArrayList<String>>(); 
     ArrayList<String> choices; 


     //first retrive elements from getQuestionArray 
     questIndex = getQuestion.get(arrayRow).get(0); 
     aIndex = getQuestion.get(arrayRow).get(1); 
     bIndex = getQuestion.get(arrayRow).get(2); 
     cIndex = getQuestion.get(arrayRow).get(3); 
     dIndex = getQuestion.get(arrayRow).get(4); 
     answerIndex = getQuestion.get(arrayRow).get(5); 


     //get the correct answer (This is Word of senteces) 
     String correctAnswer = ""; 
     if(answerIndex.equals("a")){ 
      correctAnswer = aIndex; 
     }else if(answerIndex.equals("b")){ 
      correctAnswer = bIndex; 
     }else if(answerIndex.equals("c")){ 
      correctAnswer = cIndex; 
     }else if(answerIndex.equals("d")){ 
      correctAnswer = dIndex; 
     } 

     //Im using this to shuffle my abcd Im creating new ArrayList for that 
     choices.add(aIndex); 
     choices.add(bIndex); 
     choices.add(cIndex); 
     choices.add(dIndex); 

     Collections.shuffle(choices); 

     int correctIndex; 
     //Find now where is our correct answer 
     correctIndex = choices.indexOf(correctAnswer); 


     //our correct letter now 
     switch(correctIndex){ 
     case 0: 
      answerIndex = "a"; 
      break; 
     case 1: 
      answerIndex = "b"; 
      break; 
     case 2: 
      answerIndex = "c"; 
      break; 
     case 3: 
      answerIndex = "d"; 
      break; 
     } 

     aIndex = choices.get(0); 
     bIndex = choices.get(1); 
     cIndex = choices.get(2); 
     dIndex = choices.get(3); 

     question.setText(questIndex); 
     cA.setText(aIndex); 
     cB.setText(bIndex); 
     cC.setText(cIndex); 
     cD.setText(dIndex); 

有沒有辦法做到這一點？

Answer 1

我將創建一個類MyQuestion這個字段：

public class MyQuestion{ 
    String question; 
    String answer; 
    List<String> options; 
} 

，然後調用Collections.shuffle（選件）;

或者你創建這樣的方法：

public static void shuffle(List list, int a, int b){ 
     List shuffleList = new ArrayList(); 
     for (int i = a; i <= b; i++) 
      shuffleList.add(list.get(i)); 
     Collections.shuffle(shuffleList); 
     for (int i = a; i i<= b; i++) 
      list.set(i, shuffleList.get(i-a)); 
    } 

我沒有使用泛型只是要快，但它很容易將它們添加