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

The Application contains 7000+ (300+ packages) android class information up to API Level 30 (Android 11.0).

The whole information was taken from http://developer.android.com/reference/packages.html and the information made available in offline with in the application (file size ~50MB).

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 with out 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 :-))
* Up to API 30 Content
* Search by class name
* Bookmarks
* History
* API Filtering
* Future updates