Perfect recipe of Library Module For Android Applications

What are Libraries for Android applications?

The Android Support Library is a set of code libraries — resources that can be used to build features and/or functions into an app — that provide things like features or widgets that would normally require an actual Android framework API to include in an app. Android framework APIs are the core features available to developers provided by a specific version of Android. For example, Android 7.0 APIs enabled multi-window support for every app on every device. Support Libraries can provide similar features independently of the operating system version. In this tutorial we would learn to create library module for Android.

There are generally two types of support library packages. One set enables features of new versions of Android on devices running an older version and the other provides standalone features for all versions of Android. Because these aren’t part of Android proper, they can be improved and updated without waiting for a major Android platform release.

In addition to JAR files, the Android uses a binary distribution format called Android ARchive(AAR). The .aar bundle is the binary distribution of an Android Library Project.