Android template video app

I need a shell or template for an Android app creating. It is a single screen app. Across the bottom will be three buttons related to three categories. When a category is selected, the main background changes to a preset still image (first category selected by default when the app loads). Up the side of each category will be 4 buttons. When a button is pressed, a full screen video will launch and play to the end and then close. In total, the app will launch 12 videos, 4 per category. These videos are not yet available, and the template app can launch any video for demo purposes. This video is a local resource. The app will not require any connectivity to work once downloaded - all resources will be included locally.