java - 安卓随机数

Question

我要从数组中生成一张随机卡片。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 是一个整数

因此您需要在代码中的某个位置对数组进行排名[b]

根据您的代码，也许应该阅读 showcard1.setBackgroundResource(rank[b]);