The Application contains 6500+ (300+ packages) android class information up to API Level 27 (Android 8.1).

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 ~45MB).

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

All the content up to API level 23 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 23
* 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 27 Content
* Search by class name
* Bookmarks
* History
* API Filtering
* Future updates

// Option A //

To download Offline Android API Reference mod from HappyMod.com.
You need enable the option "Unknown Sources".
1. Click on the above link to download Offline Android API Reference mod APK.
2. Save the file in your device Downloads folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B //

To download Offline Android API Reference from HappyMod APP, you can follow this:
1. Open your browser and download the HappyMod APK file from HappyMod.com - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android downloads and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search Offline Android API Reference in HappyMod App.