Is there any Leanback library support for Android level 19 API? In this link https://developer.android.com/reference/android/support/v17/leanback/package-summary.html Google claims to support API level 21+. So I'm not sure if there is support for API level 19.
LeanBack was introduced in the support library v21, so no in v19
v21
http://developer.android.com/tools/support-library/features.html#v17-leanback
, Android 19 aka 4.4, v21