Drawable resource from custom attribute

Question

Is there any possibility to get resource from drawable folder right in some custom attribute, so i can write:

<com.my.custom.View
    android:layout_height="50dp"
    android:layout_width="50dp"
    ...
    my_custom:drawableSomewhere="@drawable/some_image" />

and then simple perform action with drawable inside my custom view class?

Answer 1

There is actually an attribute format called "reference". So you will get something like this in your custom views class:

case R.styleable.PMRadiogroup_images:
                    icons = a.getDrawable (attr);
                    break;

While having sometning like this in your attrs.xml:

<attr name="images" format="reference"/>

Where "a" is a TypedArray that you get from attributes taken from the views constructor.

There is a good similar answer here: Defining custom attrs

Answer 2

See EdgarK's answer; it's better. (I can't delete this since it's the accepted answer)

Does this answer your question?

"You can use format="integer", the resource id of the drawable, and AttributeSet.getDrawable(...)."

(From https://stackoverflow.com/a/6108156/413254)