Usar la aplicación APKPure
Obtener Android Library versión histórica en Android
Aplicación para ayudar a los desarrolladores a encontrar bibliotecas útiles.
Android Library is the platform to help developers to explore more & more libraries to help to make their development process easier.
Library is the terms where you will find everything related to Android.
So you will find libraries, will learn android, will know many other things about the android.