2015-06-27 123 views
-1

我有一个方法,启动一个if语句onClick以显示列表数组中的问题,删除该项目,然后增加一个int以便再次显示另一个问题onClick。该变量在onCreate之前定义。当我第一次点击按钮时,一个随机项从数组中拉出并显示出来。如果我再次点击它,它什么也不做。什么?将变量传递到其他方法

爪哇

public class Careunderfirequiz extends AppCompatActivity{ 

int questionsAnswered = 0; 

List<String> questions = new ArrayList<>(); 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    getSupportActionBar().hide(); 
    setContentView(R.layout.myLayout); 
    questions.add("1"); 
    questions.add("2"); 
    questions.add("3"); 
    questions.add("4"); 
    questions.add("5"); 
    questions.add("6"); 
    questions.add("7"); 
    questions.add("8"); 
    questions.add("9"); 
    questions.add("10"); 
} 

public void nextQuestion(View view){ 
    TextView questionsTextView = (TextView)findViewById(R.id.questions); 
    Button next = (Button)findViewById(R.id.next); 
    if(questionsAnswered == 0){ 
     Random randomGenerator = new Random(); 
     String randQuestion = questions.get(randomGenerator.nextInt(questions.size())); 
     questionsTextView.setText(randQuestion); 
     questions.remove(randQuestion); 
     questionsAnswered++; 
    } 
    if(questionsAnswered == 1){ 
     Random randomGenerator = new Random(); 
     String randQuestion = questions.get(randomGenerator.nextInt(questions.size())); 
     questionsTextView.setText(randQuestion); 
     questions.remove(randQuestion); 
     questionsAnswered++; 
    } 

} 

}

+0

的'如果(questionAnwerered == 0)'和'如果(questionAnswered == 1)'似乎没有必要,因为你的代码始终是相同的反正。只要注意questionAnswered == 10,因为只有10个问题。另外'next'变量没有被使用,因此无论如何都不需要找到它,因为按钮被传递给方法,因为'view'变量总是(假设你设置了android:onclick =“nextQuestion”布局中的按钮。 – Ridcully

回答

0

您使用remove方法与String输入,这将使用值不索引中删除该项目,如果选择Random类例如值= 2两次,在第一时间remove方法将删除项目与value =2,但第二次remove方法什么都不做,因为具有value=2的项目已被删除。

请修复nextQuestion方法

public void nextQuestion(View view){ 
     TextView questionsTextView = (TextView)findViewById(R.id.questions); 
     Button next = (Button)findViewById(R.id.next); 
     if(questionsAnswered == 0 || questionsAnswered ==1){ 
      int index=randomGenerator.nextInt(questions.size()) 
      Random randomGenerator = new Random(); 
      String randQuestion = questions.get(index); 
      questionsTextView.setText(randQuestion); 
      questions.remove(index); 
      questionsAnswered++; 
     } 


    }