在图像视图中显示随机jpg

Question

我在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显示图像视图中的相应图像，例如随机数字5如此显示5.jpg。

我该怎么做？谢谢！ :-)

Answer 1

试试这个：

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); 

} 

希望这可以帮助你！

Answer 2

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 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; 
}