More recently Google revealed a simple Flickr viewer/reader that will be part of the apps-for-android project.
Photostream aims to highlight several of Android’s features and API’s, these include:
- Activity aliases
- Adding custom shortcuts to Home
- Adding a new wallpaper chooser to the system
- Custom layouts
- Custom XML attributes
- Use of themes
- Use of styles
- Use of text colors
- Use of <include>
- Use of bitmap and layer drawables from XML
- Use of HttpClient
- Proper interaction between background threads and the UI thread
- Efficient display rotation (using the new onRetainNonConfigurationInstance() API)
- Animations and layout animations
- Cropping an image
- Image manipulation
http://android-developers.blogspot.com/2008/09/android-photostream.html