Question

我有3张图片，我想在其中生成随机数。有一个数字数组，最小值为0，最大值为9.随机数生成一次但不再生成。

...代码

int r;
int min_ran=0;
int max_ran=9;

random.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            r = ran.nextInt(max_ran - min_ran + 1) + min_ran;
            img1.setImageResource(images[image1+1]);
            img2.setImageResource(images[image1-1]);
            img3.setImageResource(images[(image1+1)*1]);
        }
    });

请帮忙

Answer 1

使用此选项随机选择3张图像（范围从0到9）

random.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
       img1.setImageResource(images[ran.nextInt(10)]);
       img2.setImageResource(images[ran.nextInt(10)]);
       img3.setImageResource(images[ran.nextInt(10)]);
    }
}

Answer 2

我想您想为3幅图像设置3种不同的图像资源，并从名为images[]的图像资源数组中选择它们。要随机选择3个彼此不同的图像，您可以执行以下操作：

private Random randomGenerator = new Random();

random.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {
        int firstIndex = randomGenerator.nextInt(10);
        int secondIndex = newDifferentRandomNumber(firstIndex);
        int thirdIndex = newDifferentRandomNumber(firstIndex, secondIndex);
        img1.setImageResource(images[firstIndex]);
        img2.setImageResource(images[secondIndex]);
        img3.setImageResource(images[thirdIndex]);
    }
});

/**
 * Generates a new random number that is different from the given one.
 */
private int newDifferentRandomNumber(int number) {
    // generate a random int between 0 and 9
    int newDifferentRandomNumber = randomGenerator.nextInt(10);
    // check if it is equal to the given number, if yes repeat recursively
    if (newDifferentRandomNumber == number) {
        newDifferentRandomNumber = newDifferentRandomNumber(number);
    }
    return newDifferentRandomNumber;
}

/**
 * Generates a new random number that is different from the 2 given ones.
 */
private int newDifferentRandomNumber(int oneNumber, int anotherNumber) {
    // generate a random int between 0 and 9
    int newDifferentRandomNumber = randomGenerator.nextInt(10);
    // check if it is equal to one of the given numbers, 
    // if yes repeat recursively
    if (newDifferentRandomNumber == number 
            || newDifferentRandomNumber == anotherNumber) {
        newDifferentRandomNumber = newDifferentRandomNumber(number);
    }
    return newDifferentRandomNumber;
}

在3个不同的图像上生成随机数

2 个答案: