OK, I figured it out.

There are three possible constructors on a Preference:

MyPreference(Context ctxt)
MyPreference(Context ctxt, AttributeSet attrs)
MyPreference(Context ctxt, AttributeSet attrs, int defStyle)

Somewhere along the line, I picked up the pattern of having the
one-parameter constructor chain to the two-parameter constructor
(passing null for the 2nd parameter), and having the two-parameter
constructor chain to the three-parameter constructor (passing 0 for
the 3rd parameter).

And that's not the right answer.

I am hoping that the right answer is to only implement the second
constructor, because the correct default style is internal to Android
(com.android.internal.R.attr.dialogPreferenceStyle). The second
constructor is the one used with inflating preference XML.

Thanks to all for the help!

-- 
Mark Murphy (a Commons Guy)
http://commonsware.com | http://github.com/commonsguy
http://commonsware.com/blog | http://twitter.com/commonsguy

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