For 	
Kotlin Android API Reference - Offline, Please check: 
https://play.google.com/store/apps/details?id=com.makam.reference.androidkotlin

The Application contains 11000+ (300+ packages) android class information up to API Level 34 (Android 14.0). 

The whole information was taken from http://developer.android.com/reference/packages.html and the information made available in offline with in the application (~55gb of data compressed into size ~85MB).

Application provides an option to view the class information by Alphabetical order or by package.

All the content up to API level 25 can be accessed freely without any adds from Free version. 

But if you want premium features and want to encourage further development, please, upgrade to premium version using In-App purchase.

**********Free App Features**********
* Content Up to API 25
* View by package
* View by Class Name
* Deep link to http://developer.android.com/reference
 
**********Premium App Features**********
* All the Free App Features (Obviously :-))
* All API Versions
* Search by class name
* Bookmarks
* History
* API Filtering
* Future Features

Offline Android API reference For Android Developers.