Random number guessing game: The computer thinks of a number from 1 to 1000. The user makes guesses, and after each incorrect guess, the app hints to the user whether the right answer is higher or lower than their guess. The game ends when the player guesses the right number.
Memory Game: Several buttons are shown on screen, "face down", and the user needs to try to find pairs that match up when flipped over.
Mr. Potato Head (thanks to Victoria Kirst for original assignment idea and images!) Write an app that displays a "Mr. Potato Head" toy on the screen as an ImageView. The toy has several accessories and body parts that can be placed on it, such as eyes, nose, mouth, ears, hat, shoes, and so on. We will provide you with image files for each body part and accessory, such as body.png, ears.png, hat.png, and so on. Initially your image view should display only the toy's body, but if the user checks/unchecks any of the check boxes below the toy, the corresponding body part or accessory should appear/disappear. The way to display the various body parts is to create a separate ImageView for each part, and lay them out in the XML so that they are superimposed on top of each other. You can achieve this with a RelativeLayout in which you give every image the same position, though you should probably nest it in some other overall layout for the screen. The check boxes should align themselves into a grid of rows and columns. You can set whether or not an image (or any other widget) is visible on the screen by setting its android:visibility property in the XML, and/or by calling its setVisibility method in your Java code. The setVisibility method accepts a parameter such as View.VISIBLE or View.INVISIBLE. There is also a getVisibility method if you need to check whether a widget is currently visible.