Android的随机数 [英] Android Random Number

问题描述

我为产生从Array单随机卡。和分配它。
下面是code..but其是否显示错误。
有什么问题？

 公共无效兰特（）{
    串秩[] = {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};    随机randInt =新的随机（）;    INT B = randInt.nextInt（（rank.length））;
    showcard1.setBackgroundResource（二）;
}
 

解决方案

b为一个int

所以你需要等级[B]数组在你的code某一点

根据您的code也许它应该阅读
showcard1.setBackgroundResource（排名[B]）;

I m generating one random card from array. and assigning it.' Below is the code..but its is showing an error. What is the problem?

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); 
}

解决方案

b is an int

so you need rank[b] the array at some point in your code

According to your code maybe it should read showcard1.setBackgroundResource(rank[b]);

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