The aim of my bachelor thesis is to describe the development of the user interface of the application on the Android platform. The introduction briefly introduces the Android operating system and describes the architecture of applications. Description of the user interface components, including practical examples of their use in the application, follows in next chapters. Emphasis is focused on the development in accordance with the graphics specification Material Design and the principles of correct design and development of Android applications. The practical part describes the procedure of the user interface development on the sample application. The thesis is focused on beginning developers of mobile applications for learning of user int...