The Android 1.5 update will bring widget support to the Android platform’s home screen. The recently announced Android 1.5 SDK includes the AppWidget framework that enables Android developers to write widgets that can be dropped onto the home screen.
One exciting new feature in the Android 1.5 SDK is the AppWidget framework which allows developers to write “widgets” that people can drop onto their home screen and interact with. Widgets can provide a quick glimpse into full-featured apps, such as showing upcoming calendar events, or viewing details about a song playing in the background.
When widgets are dropped onto the home screen, they are given a reserved space to display custom content provided by your app. Users can also interact with your app through the widget, for example pausing or switching music tracks. If you have a background service, you can push widget updates on your own schedule, or the AppWidget framework provides an automatic update mechanism.
The Android Developer blog also has a great introduction to developing Android widgets, along with code examples to get started with.