JellyBean 4.2 added a lovely little callback to the ViewPager class called the PageTransformer. (Also available in the Compatibility Lib 11)
Big deal you may ask? Look at this:
So the page from the right fades in and the page going left fades out! Really simple, but nice effect. Works nicely with picture pagers. Code? Sure!
mViewPager.setPageTransformer(false, new PageTransformer()
{
@SuppressLint("NewApi")
@Override
public void transformPage(View v, float pos)
{
final float invt = Math.abs(Math.abs(pos) - 1);
v.setAlpha(invt);
}
});
Lovely bit of code, we normalise the float coming in (so its always 0 to 1) then we apply that to the View.setAlpha(float) method. This works with any of the View transformation methods! (Alpha,setX/Y, rotateX/Y).
You can of course get a bit silly with this! So please be sensible, I don’t want to be seeing 360 spins on page transitions… (yeah I’ve tried!)
Update: Damian Flannery made this neat little transition https://gist.github.com/4197613