The first game we build will allow us to introduce some key Java beginner's topics. Code comments, variables, operators, methods, loops, generating random numbers, if, else, switch and a brief introduction to object-oriented programming. We will also see how to communicate with the Android OS, detect screen touches, draw simple graphics, detect the screen resolution and handle different screen sizes. All this will be used to build a simpler variation of the classic Minesweeper type game. Here is one of the screens from that game.

This will be a tap-to-shoot game where the player has to guess the position of the sub', then refine their next shot based on the "sonar" report of the previous shot.