android - 在 imageview 中显示随机 jpg

Question

我的原始文件夹中有一堆图像，名称范围从 1.jpg 到 100.jpg。我想生成一个介于 1 - 100 之间的随机数，然后根据生成的数字在图像视图中显示相应的图像，例如随机数 5，因此显示 5.jpg。

我怎样才能做到这一点？谢谢！:-)

Answer 1

  Random random = new Random();

  // The +1 because nextInt(100) delivers between 0-99
  int drawableNumber = random.nextInt(100) +1;

  String drawableName = recourceNum + ".jpg";

  yourImageView.setImageDrawable(getRecource().getDrawable(getRecources().getIdentifier(drawableName, "res/drawable", yourPackageName);

Answer 2

尝试这个：

oncreate(){

1- initialize your imageView say imgView.
2- generate a random number between 1 to 100, say random.
3- make sure you have all those 100 images in your res/drawable folder.

4- get the res ID related to the random by using following code:

    int id = context.getResources().getIdentifier(String.valueOf(random), "drawable", context.getPackageName());

5- imgView.setImageResource(id);

}

希望这对你有帮助！！

Answer 3

private static int getRandomInteger(int aStart, int aEnd) {
    long range = (long) aEnd - (long) aStart + 1;
    long fraction = (long) (range * new Random().nextDouble());
    int randomNumber = (int) (fraction + aStart);
    return randomNumber;
}