Android随机数

Question

我从数组生成一张随机卡。并分配它。' 下面是代码..但它显示错误。 有什么问题？

public void rand() {
    String rank[]=  {"tclub1.png", "tclub2.png", "tclub3.png", "tclub4.png", "tclub5.png", "tclub6.png", "tclub7.png", "tclub8.png", "tclub9.png", "tclub10.png","tclub11.png", "tclub12.png", "tclub13.png"};

    Random randInt = new Random();

    int b = randInt.nextInt((rank.length));
    showcard1.setBackgroundResource(b); 
}

Answer 1

b是一个int

因此您需要在代码中的某个位置对[b]数组进行排名

根据你的代码，也许应该阅读 showcard1.setBackgroundResource（秩并[b]）;

Answer 2

尝试更改为int b = randInt.nextInt((rank.length)) - 1;（因为rank.length = 13且您的数组的编号从0到12）