Setting Spannable.Factory for all TextViews within a Theme

I was wondering if it is possible to somehow set TextViews with a given Theme to have a Spannable.Factory-instance without having to manually declare:

• a new type of TextView (one which extends TextView and in the constructor somewhere overriding the factory)
• or set it on every instance of TextView after inflating it.

Ideally it would be nice to have something like

<TextView
 android:spannableFactory="com.mypackage.Class"
/>

Worst case is that it makes a new开发者_如何学JAVA instance of the class each time, but even that is more desirable than having to explicitly deal with setting the factory every time.