I hope I'm not missing somewhere in the documents something important...
It would be very nice and helpful to have access to the "layout managers" (i. e. "ViewGroup" e. g. LinearLayout, RelativeLayout, TableLayout) from the Android UI toolkit, especially for generating liquid designs by code.
I was looking at the layout tricks also and have been able to modify the code to do the same thing, except for 'android:layout_alignWithParentIfMissing'. I don't need it in my app (so far), although i don't think it would be too hard to code the different sizes.
If you want a relative layout, all you would need to do is check to see if all labels have data in them and if not them resize the height of the other labels to fill the whole panel.
Edit:
I have attached a sample of a RelativeLayout.