What's happening: The first two ViewPager pages loaded nicely (ViewPager automatically loads +-1 from current page). When you scroll past these the next pages aren't showing up. GIF demo of the problem below.
Debug info: The pages are being instantiated (see code below) and are successfully added to the ViewPager ArrayList<ItemInfo>mItems (confirmed via Log messages). I recompiled the android.support.v4 library with debug=true set (mmm frameworks/support/v4/ in aosp) and it shows everything working perfectly EXCEPT:
The onLayout and onMeasure methods in ViewPager stop being called after the first two views are loaded. This means the other pages are black because they were never measured&arranged as they should have been. I tried adding different requestLayout() calls at different points to force a layout tree refresh to no avail.
Background: I have a ViewPager instantiated via inflater.inflate and found via view.findViewById(R.layouy.myid). It's directly replacing an old Gallery view, and for testing purposes the PagerAdapter instantiateItem(collection, position) simply does this:
@Override
public Object instantiateItem(View collection, final int position) {
final TextView tv = new TextView(collection.getContext());
tv.setText("Looking at page " + position);
tv.setTextColor(Color.WHITE);
tv.setBackgroundColor(Color.rgb( (int)(Math.random()*100), (int)(Math.random()*100), (int)(Math.random()*100)));
tv.setTextSize(22);
((ViewPager) collection).addView(tv);
return tv;
}
Any ideas? It looks to me like some mystery setting in PageView's parents are somehow disabling onLayout PageView