Question

我正在制作这个应用程序，每次用户点击当前卡片的图像时，随机播放卡片并显示随机卡片。我制作了一个包含所有卡片图像的数组，并使用了“Fisher Yates Shuffle＆＃39;洗牌阵列。这是我写的代码：

public class MainActivity extends Activity {     

int[] cards={R.drawable.aceofspades,R.drawable.aceofhearts,R.drawable.aceofclubs};{
int i = cards.length, j, temp;

while(--i > 0){
    j = (int) Math.floor(Math.random() * (i+1));
    temp = cards[j];
    cards[i] = cards[j];
    cards[i] = temp;
}



@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

}

public void imageClick(View view) { 

    {
    ImageView image = (ImageView) findViewById(R.id.imageDice1);
    image.setImageResource(cards); // This gives an error: change type of 'cards' to 'int'.
    }


 } 

}

问题是，我不知道如何设置＆＃39; image.setImageResource＆＃39;。它应该是第一个混洗卡阵列，当用户点击它时，它应该成为数组中的下一个（类似于i ++）。我试过卡片＃39;但它给了我一个错误。＆＃39;卡[I]＆＃39;也不起作用。可能是什么问题？

Answer 1

条件循环从不存在于将while loop置于函数

中的程序中

类似这样的事情

 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    while(--i > 0){
        j = (int) Math.floor(Math.random() * (i+1));
        temp = cards[j];
        cards[i] = cards[j];
        cards[i] = temp;
    }

}

Answer 2

尝试这样的事情。

public class MainActivity extends Activity {

    int currentCardIndex = 0;
    int[] cards = { /* card drawables here */};


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        shuffle(cards);
    }

    public void imageClick(View view) {
        ImageView image = (ImageView) findViewById(R.id.imageDice1);
        image.setImageResource(cards[currentCardIndex++]);
    }

    private void shuffle(int[] array) {
        int idx, tmp;
        Random random = new Random();
        for (int i = array.length - 1; i > 0; i--) {
            idx = random.nextInt(i + 1);
            tmp = array[idx];
            array[idx] = array[i];
            array[i] = tmp;
        }
    }

}

setImageResource到shuffled Cards数组

2 个答案: