Some of the best samples are from Google - https://developer.android.com/samples https://developer.android.com/samples . They are some of the best examples of

Some of the best samples are from Google - https://developer.android.com/samples https://developer.android.com/samples . They are some of the best examples of how to program Android, especially in terms of keeping to best practices and avoiding now-deprecated techniques. The quality of Fossdroid/Fdroid apps are hit and miss - some are good, some not. I should know, some of my ports to Android are on it ( http://fossdroid.com/a/truly-creative-live-wallpaper.html http://fossdroid.com/a/truly-creative-live-wallpaper.html ) where I'm still very nervous that critical sections survived my port safely.