Creating integer array of resource IDs

Question

I have some images in my res/drawable folder. Let's say img1.png, img2.png and img3.png. I am currently creating an integer array of these image IDs in Java like this

int[] imgIds = {R.drawable.img1, R.drawable.img2, R.drawable.img3};

Instead, is it possible to create an integer array in one of res/values files (say strings.xml) like this

<integer-array name="img_id_arr">
    <item>@drawable/img1</item>
    <item>@drawable/img2</item>
    <item>@drawable/img3</item>
</integer-array>

and then access it in Java via getResources().getIntArray(R.array.img_id_arr)?

resnbl · Accepted Answer · 2011-03-18 06:45:32Z

70

Use just "array" instead of "integer-array". See Typed Array in the developer guide.

answered Mar 18, 2011 at 6:45

resnbl

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2 Comments

Etienne Lawlor Over a year ago

This seems to work for drawables but not for styles for example: <array name="themes"> <item>@android:style/Theme</item> <item>@android:style/Theme.Light</item> <item>@android:style/Theme.Holo</item> <item>@android:style/Theme.Holo.Light</item> </array> How can this work for other resource ids aside from drawables?

AXSM Over a year ago

I think, as far as i know, is create an int array representing the pre-compiled value itself and not the value what it represents. if someone has any idea it's welcome.

Joe Bowbeer · Accepted Answer · 2012-09-18 03:48:47Z

53

See XML integer array, resource references, getIntArray

TypedArray ar = context.getResources().obtainTypedArray(R.array.my_array);
int len = ar.length();
int[] resIds = new int[len];
for (int i = 0; i < len; i++)
    resIds[i] = ar.getResourceId(i, 0);
ar.recycle();
// Do stuff with resolved reference array, resIds[]...
for (int i = 0; i < len; i++)
    Log.v (TAG, "Res Id " + i + " is " + Integer.toHexString(resIds[i]));

answered Sep 18, 2012 at 3:48

Joe Bowbeer

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2 Comments

android developer Over a year ago

is it possible to obtain a single reference to a resource instead of an array? i need it in case i want to check if 2 resource ids are equal.

Denny Over a year ago

I guess we'll never know

xandy · Accepted Answer · 2011-03-18 01:43:34Z

2

Make a LevelListDrawable. Although it is not exactly what you want, but pretty much achievable.

answered Mar 18, 2011 at 1:43

xandy

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1 Comment

Tobias Over a year ago

Very elegant and very underrated solution.

android developer · Accepted Answer · 2020-11-29 14:22:00Z

0

I think it's best to keep them in code.

private static final int[] AVATARS = new int[]{
            R.drawable.ava_1, R.drawable.ava_2, R.drawable.ava_3...};

edited Nov 29, 2020 at 14:22

answered Nov 23, 2020 at 13:58

android developer

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