Question

您好我正在尝试创建一个简单的旗帜测验应用程序，其中出现一个标志图像，用户从3个选项中选择正确的答案，但是在显示两个标志后应用程序会继续崩溃。我认为这可能与图像阵列中的内存泄漏有关，但我无法弄清楚如何阻止它。我试图将图像设置为null，但是当我尝试mapPics [i] = null时它会显示错误;如下所示。该错误表示图像不能设置为null，因为它是一个整数。任何帮助将不胜感激！

public class game1 extends Activity implements View.OnClickListener
{
   static Button next;
   static ImageView mainpic;
   static RadioGroup radioGroup;
   static RadioButton option1;
   static RadioButton option2;
   static RadioButton option3;
   static int[] mapPics = new int[]{R.drawable.america, R.drawable.england,     R.drawable.australia, R.drawable.poland, R.drawable.sweden, R.drawable.spain};
   static String [] answers= new String[]{"Spain", "Poland", "Sweden",  "America", "England", "Australia"};
   static int [] correctAnswer= new int[]{2, 1};
   static int score=0;
   static int i=0;
   static int a=0;
   static int b=1;
   static int c=2;

   @Override
   public void onCreate(Bundle savedInstanceState)
   {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.game1);

      next= (Button)findViewById(R.id.nextButton);
      mainpic= (ImageView)findViewById(R.id.imageView);
      mainpic.setImageResource(mapPics[i]);
      next.setOnClickListener(this);


      addListenerRadioGroup();
      option1.setText(String.valueOf(answers[a]));
      option2.setText(String.valueOf(answers[b]));
      option3.setText(String.valueOf(answers[c]));


   }//On Create

   public void addListenerRadioGroup(){
      option1= (RadioButton)findViewById(R.id.radioButton);
      option2= (RadioButton)findViewById(R.id.radioButton2);
      option3= (RadioButton)findViewById(R.id.radioButton3);
      radioGroup = (RadioGroup)findViewById(R.id.radioGroupAnswers);
      radioGroup.setOnClickListener(new View.OnClickListener()
   {
     @Override
     public void onClick(View v)
     {
        radioGroup.getCheckedRadioButtonId();
     }
  });

  }


   @Override
   public void onClick(View v)
   {
      getSelectedAnswer();
      i++;
      a=a+3;
      b=b+3;
      c=c+3;
      if(i >=1) {

     Intent myIntent = new Intent(this, scores.class);
     myIntent.putExtra("scores", score);
     startActivity(myIntent);

  }//if
  mainpic.setImageResource(mapPics[i]);
  option1.setText(String.valueOf(answers[a]));
  option2.setText(String.valueOf(answers[b]));
  option3.setText(String.valueOf(answers[c]));
  mapPics[i]=null;
  }//onClick

  public void getSelectedAnswer() {
  int index = radioGroup.indexOfChild(findViewById(radioGroup.getCheckedRadioButtonId()));
  if (index==correctAnswer[i])
     score++;



   }//get selected answer

  }//class

Answer 1

您收到的错误消息确切地告诉您问题所在您已将mapPics声明为int：

的数组

static int[] mapPics = new int[]{R.drawable.america, R.drawable.england,     R.drawable.australia, R.drawable.poland, R.drawable.sweden, R.drawable.spain};

int是基本类型，因此您无法将其设置为null。如果您想要可以为空的类型，请改用Integer[]。

将数组中使用的值设置为null

1 个答案: