Android: define which attributes a custom view uses for content assist

Question

I've got some custom views and custom defined attributes. I'd like to define which attributes my views use so that eclipse can use that for content-assist.

For example, I've got a custom xml attribute declared like so in my res/values folder:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="TagAttrs">
        <attr name="spColor" format="color" />
    </declare-styleable>
</resources> 

And my layout file uses a custom view with the custom attribute:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res/com.twp"
    ...
    >

    <com.twp.TestView
        android:id="@+id/testView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:spColor="#FF00FF" >
       ...
   </com.twp.TestView>
</LinearLayout>

If I use the android: prefix, eclipse presents all the options it would for a LinearLayout (from which TestView derives), but if I use the app: prefix, it shows in red at the bottom that "Element com.twp.TestView not available". Also, if I try content-assist inside of spColor, it says "Content Assist not available at the current location." I would think since I defined the "app" namespace, it would be able to find my stylable declaration and at least know that spColor is a color.

So it this just a limitation of eclipse, or can I explicitly define a view's custom attributes?

Answer 1

I believe the value for the name attribute in declare-styleable needs to match the unqualified name of the associated class or the unqualified name of a superclass of the associated class. So if the direct superclass of TestView is LinearLayout, then the value of the name attribute in the associated declare-styleable should be TestView, not TagAttrs.