Take a look at the sample source code

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Android comes with a number of sample source code projects, built into your SDK download.

Take a look at some of the sample projects to see what is similar or has components that you want your app to have.

• Bluetooth Chat (connect to sensors or other devices)
• Voice recognition service (make your app more intelligent and hands free)
• TTS Engine (Text To Speech, make your app talk)
• Gesture Builder (drawing on the screen, getting touch points, building a gesture UI)
• Api Demos (shows examples of all UI elements and basic stuff like how to play and record video/audio etc, this is the place to start when you are building a new app)
• TicTacToeLib & TicTacToeMaine (shows how to break your app into reusable libraries, its very easy and lets you reuse your code)
• Searchable Dictionary (shows how to use databases)
• ... and more ...