Storing R.drawable IDs in XML array

Question

I would like to store drawable resources' ID in the form of R.drawable.* inside an array using an XML values file, and then retrieve the array in my activity.

Any ideas of how to achieve this?

Answer 1

You use a typed array in arrays.xml file within your /res/values folder that looks like this:

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <integer-array name="random_imgs">
        <item>@drawable/car_01</item>
        <item>@drawable/balloon_random_02</item>
        <item>@drawable/dog_03</item>
    </integer-array>

</resources>

Then in your activity, access them like so:

TypedArray imgs = getResources().obtainTypedArray(R.array.random_imgs);

// get resource ID by index, use 0 as default to set null resource
imgs.getResourceId(i, 0)

// or set you ImageView's resource to the id
mImgView1.setImageResource(imgs.getResourceId(i, 0));

// recycle the array
imgs.recycle();

Answer 2

In the value folder create xml file name it arrays.xml add the data to it in this way

<integer-array name="your_array_name">
    <item>@drawable/1</item>
    <item>@drawable/2</item>
    <item>@drawable/3</item>
    <item>@drawable/4</item>
</integer-array>

Then obtain it to your code this way

private TypedArray img;
img = getResources().obtainTypedArray(R.array.your_array_name);

Then to use a Drawable of these in the img TypedArray for example as an ImageView background use the following code

ImageView.setBackgroundResource(img.getResourceId(index, defaultValue));

where index is the Drawable index. defaultValue is a value you give if there is no item at this index

For more information about TypedArray visit this link http://developer.android.com/reference/android/content/res/TypedArray.html

Answer 3

You can use this to create an array of other resources, such as drawables. Note that the array is not required to be homogeneous, so you can create an array of mixed resource types, but you must be aware of what and where the data types are in the array.

 <?xml version="1.0" encoding="utf-8"?>
<resources>
    <array name="icons">
        <item>@drawable/home</item>
        <item>@drawable/settings</item>
        <item>@drawable/logout</item>
    </array>
    <array name="colors">
        <item>#FFFF0000</item>
        <item>#FF00FF00</item>
        <item>#FF0000FF</item>
    </array>
</resources>

And obtain the resources in your activity like this

Resources res = getResources();
TypedArray icons = res.obtainTypedArray(R.array.icons);
Drawable drawable = icons.getDrawable(0);

TypedArray colors = res.obtainTypedArray(R.array.colors);
int color = colors.getColor(0,0);

Enjoy!!!!!

Answer 4

In Kotlin, you can do as:-

 <integer-array name="drawer_icons">
    <item>@drawable/drawer_home</item>
</integer-array>

You will get array of Image from the resource as TypedArray

 val imageArray = resources.obtainTypedArray(R.array.drawer_icons)

get resource ID by the index

imageArray.getResourceId(imageArray.getIndex(0),-1)

OR you can set imageView's resource to the id

imageView.setImageResource(imageArray.getResourceId(imageArray.getIndex(0),-1))

and in last recycle the array

imageArray.recycle()

Answer 5

kotlin way could be this:

fun Int.resDrawableArray(context: Context, index: Int, block: (drawableResId: Int) -> Unit) {
  val array = context.resources.obtainTypedArray(this)
  block(array.getResourceId(index, -1))
  array.recycle()
}

R.array.random_imgs.resDrawableArray(context, 0) {
  mImgView1.setImageResource(it)
}