ArrayList的随机背景<Drawable>

Question

in my app i have this part of code for set a background image to a button!

private int [] [] double;
private List<Drawable> images;
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images = new ArrayList<Drawable>();

images.add(getResources().getDrawable(R.drawable.img1));
images.add(getResources().getDrawable(R.drawable.img2));
images.add(getResources().getDrawable(R.drawable.img3));
images.add(getResources().getDrawable(R.drawable.img4));
images.add(getResources().getDrawable(R.drawable.img5));
images.add(getResources().getDrawable(R.drawable.img6));
images.add(getResources().getDrawable(R.drawable.img7));
images.add(getResources().getDrawable(R.drawable.img8));
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button.setBackgroundDrawable(images.get(double[x][y]));

Now i' im trying to set random image to this button from this ArrayList<Drawable>. Is there someone who has some helpful tip for me?

Answer 1

Yeah you should make an arraylist of Integers and put the drawable id in there and access it with setBackgroundResource.

Example:

private List<Integer> images;

images = new ArrayList<Integer>();

images.add(Integer.valueOf(R.drawable.img1));
button.setBackgroundResource(images.get(double[x][y]).intValue());

This way it will consume less memory since now you are only storing Integers rather than Image Drawables, and it will be more efficient.