How to define an array of integers in a declare-styleable?

Question

I'm implementing my own <declare-styleable> for a custom View (following the instructions here). I'd like to be able to specify an array of integers as one of the possible XML attributes. How do I:

Specify the integer array as an XML attribute in attrs.xml?
Get it from the TypedArray after calling obtainStyledAttributes() in my custom View?

score 33 · Accepted Answer · edited Jul 19 '17 at 08:37

33

You can declare it as a reference.

<declare-styleable name="MyView">
    <attr name="array" format="reference"/>
</declare-styleable>

It looks like TypeArray hasn't getIntArray method so you have to get it directly from the resources.

final TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.MyView);
final int id = array.getResourceId(R.styleable.MyView_array, 0);

if (id != 0) {
    final int[] values = getResources().getIntArray(id);
}

array.recycle()

edited Jul 19 '17 at 08:37

Luke

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answered Jan 08 '13 at 17:20

Vladimir Mironov

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10

Don't forget to call array.recycle() after using a TypedArray. That would be after line 2. – jpmcosta Jun 05 '13 at 11:06
I get always 0. Anything I can do? – moonlady16 Feb 13 '20 at 06:37

score 1 · Answer 2 · answered Jun 03 '22 at 13:09

Don't have enough reputation to add comments, just want to share the kotlin way, where the extension function handles recycle() call itself.

context.withStyledAttributes(attrs, R.styleable.MyView, defStyleAttr) { 
    val resourceId = getResourceId(R.styleable.MyView_array, 0) 
}

How to define an array of integers in a declare-styleable?

2 Answers2