Android custom layout attribute "reference attribute" format?

Question

I have a custom view (that extends viewgroup) and I have specified some custom attributes defined in attrs.xml....

<declare-styleable name="datascope">
    <attr name="colcount" format="integer" />
    <attr name="titleheaderrows" format="integer" />
    <attr name="colheaderrows" format="integer" />
    <attr name="rowlayout" format="reference" />
</declare-styleable>

The integers I can pickup fine, but the last one - rowlayout - I want to use to refer to a further layout file that I will inflate on demand. But I cannot find the right way to express rowlayout attribute in the main layout file. I have tried:

lui:rowlayout="@layout/sensorvaluesdata">

but this fails at runtime:

E/AndroidRuntime(22092): Caused by: java.lang.NumberFormatException: unable to parse 'res/layout/sensorvaluesdata.xml' as integer

and

lui:rowlayout="?layout/sensorvaluesdata"

which fails

E/AndroidRuntime(22341): Caused by: java.lang.NumberFormatException: unable to parse '?2130903043' as integer

Which is interesting 'cos it seems to have stuck the resource ID in there, but stuck a ? on the front as well.

My R.java files does have a sensible looking line for sensorvaluesdata.

public static final class layout {

    public static final int sensorvaluesdata=0x7f030003;

}

what is the right way to do this?

(I can hard code the info into the java source and it works fine....

View vx = li.inflate(R.layout.sensorvaluesdata, this, false);

Answer 1

Just to add a little more background for someone else. In code use something like this

LinearLayout ViewContainer=(LinearLayout) (LayoutInflater.from(context)).inflate(
    attributes.getResourceId(
        R.styleable.[styleableName]_[attributeName], 
        R.layout.[defaultValue]), 
    null);

In xml attributes under you styleable name...

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