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since the RecyclerView src is in android.support.v7.widget.RecyclerView can i use the recyclerView in kit kat and jelly bean as long as i reference this package from the support library (or google play services)?
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Android 4.4 KitKat is a version of Google's operating system (OS) for smartphones and tablets. The Android 4.4 KitKat operating system uses advanced memory optimization technologies. As a result, it is available on Android devices with as little as 512 MB of RAM.
Android 4.4 "KitKat" was officially announced on September 3, 2013. The release was internally codenamed "Key lime pie"; but John Lagerling, director of Android global partnerships, and his team, decided to drop the name, arguing that "very few people actually know the taste of a key lime pie".
Android 4.4 KitKat Final version: 4.4. 4; released on June 19, 2014.
If something is in the support library that means it can be used in any API down to what version of the support library it is.
for example v7 support library means you can use that library on any app that supports API 7 and up.
it is not API exclusive, all the 21 means is what revision it is
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