appcompat-v7 current version: Support Library Features Guide | Android Developers,Maven Repository: com.android.support » appcompat-v7 » 28.0.0,Android studio com.android.support:appcompat-v7:+ problem,com.android.support:appcompat-v7 28.0.0 on Maven - Libraries.io,
com.android.support:appcompat-v7. The Support Library is a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs.
Caution: Starting with Support Library release 26.0.0 (July 2017), the minimum supported API level across most support libraries has increased to Android 4.0 (API level 14) for most library packages. For more information, see Version Support and Package Names on this page.
Android AppCompat Library V7. ». 28.0.0. The Support Library is a static library that you can add to your Android application in order to use APIs that are either not available for older platform versions or utility APIs that aren't a part of the framework APIs. Compatible on devices running API 14 or later.
Some deprecated classes removed as we move away from old pre-V14 APIs, such as android.support.v7.NotificationCompat (use v4 NotificationCompat instead), KeyEventCompat, ParallelExecutorCompat, and SearchViewCompat.