android - How does community libraries by-pass framework limitations? -


i have come across non-framework library com.nineoldandroids.animation framework library android.view.animation

android.view.animation framework library introduced in honeycomb.
people created com.nineoldandroids.animation releases prior honeycomb (all way api 1.0)

my question how non-framework library able pull off framework stunts?
aren't limited framework able , api's exposes?
isn't framework acting wall between our app (and community libraries) , hardware?
isn't app can use framework api ?
how com.nineoldandroids.animation library doing stuff the old framework \ os can't?

thanks

the nineoldandroids library isn't doing that's limited system framework. entire android code base open source , nineoldandroids library mirrors newly introduced animation classes.


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