Find all needed information about Android Sdk Support Library. Below you can see links where you can find everything you want to know about Android Sdk Support Library.
https://developer.android.com/topic/libraries/support-library/setup
Note: With the release of Android 9.0 (API level 28) there is a new version of the support library called AndroidX which is part of Jetpack.The AndroidX library contains the existing support library and also includes the latest Jetpack components. You can continue to use the support library.
https://www.tutorialspoint.com/android/android_support_library.htm
The Android Support Library package is available through the Android SDK Manager. Follow the following steps to download the support library package through the SDK Manager. Start the android SDK Manager. In the SDK Manager window, scroll to the end of the Packages list, find the Extras folder. Select the Android Support Library item.
https://developer.android.com/topic/libraries/support-library/revisions
For earlier releases, see the Support Library Revisions Archive. Revision 28.0.0 Production (September 21, 2018) This is the stable release of Support Library 28.0.0 and is suitable for use in production. This will be the last feature release under the android.support packaging, and developers are encouraged to migrate to AndroidX. New features
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