apps-for-android, open source & official
From Google & open source
Android becomes popular and will become more popular due to its openness. If you go to China or India and ask the Mobile phone companies, what’s the platform will you choose for your smart phones. The answer is very likely: Android.
So, how to quickly step into the the promising Android apps development world? apps-for-android is one your option. It was initiated by Google with over 10 sample applications available. Many these sample applications are also downloadable in Android App Market.
One of advantages of starting your Android apps from apps-for-android is that you can dynamically interact with the people who also actively work within Android development team (e.g. Jason Chen) in Google, whereby you are able to know the latest information or the possible future road map of Android dev. It is just an extra bonus!