I haven't received any responses on stackoverflow about this, so am
giving it a shot here.
My app, which is fairly large and complex (hard to post meaningful code)
uses as its main view a ViewPager with a FragmentPagerAdapter. Since the
minSDK is 14, I originally wrote it to use the native Fragment and
related classes (ViewPager from support.v4 and FragmentPagerAdapter from
support.v13). This has all been working perfectly for a long time.
Recently I decided to build in more compatibility, mainly for themes, by
using the appcompat.v7 library. However, using this library required
that I use the Fragment and FragmentPagerAdapter, etc. classes from the
support.v4 library (meaning that I also had to change my Activity to a
FragmentActivity, call getSupportFragmentManager, etc.).
Making no more than these changes, my ViewPager comes up as a blank
screen; all I see is the ViewPager's background color; my fragments'
views are not displayed! What's really strange is that by putting in
various breakpoints, I can see that almost everything is working
underneath as far as my fragments' life-cycle methods being called, etc.
I can swipe back and forth across the screen and the fragments appear to
be swapped in and out as expected. It is particularly telling, however,
that in various custom views that I have, the onMeasure and onDraw
methods are never called!
Does anyone have any idea of what would be preventing the ViewPager from
actually drawing its views? If I revert the code to use the native
fragment support and associated supporting classes, everything shows up,
which means that if there is something wrong on my end it must be
extremely subtle.
(Just to throw in some confusion, there is another activity in the app
that also uses a ViewPager with fragments, and it continues to work with
either the native or support library classes. (I'm about to throw in the
towel and just forget this whole update.))
Doug Gordon
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