A free program for Android, by Xpert Keyboards Team.

This application is developed for people who want to type in the Serbian language. It has a nice, easy-to-use interface and supports many input methods. The user interface is easy to use and has many functions to help the user in typing, such as auto-correction, auto-suggestions, etc. You can type quickly and easily in the Serbian language with this application. 

There are also many beautiful themes to choose from in this application, such as: keyboard background, font, etc. You can also choose from a set of keypress sounds to use your favorite sound during typing, such as water sound, wood sound, and vibration. You can set the preferred language and use it as your default keyboard. This application is free to use.