This thesis presents the design and development of a mobile application suited for the Android operation system, which offers its users a simple way of finding locations inside a building with the use an indoor map. The application does not require internet connectivity and has been developed by means of free and open source tools. The advantage of this particular system is better control of map representation and a quicker update cycle, since there is no need to share information with external service providers. Although the application is modelled according to the plans of the new building of the Faculty of Computer and Information Science in Ljubljana, the solutions described in the thesis may be used as an example for other indoor mapping applications. The application allows the user to choose between floors of the building and find specific rooms by use of a search field. In order to simplify navigation, a location identifying system has been included by equipping several locations in the building with QR codes. In addition, the application enables the user to find the shortest path between two different locations. Finally, a possibility to upgrade the application has been offered, which would allow the location of the device to be detected more precisely within the building without having to scan the QR codes.