
Introduced in October 2012, the Pure Android Collection on Google Play is an exclusive group of apps deemed worthy by Google's Android Development & Design Teams. This group of apps is so exclusive only two have been accepted since the program's inception last year. (Watch this
episode of The App Clinic, where the collection is introduced to learn more about the criteria for selection.) "These apps represent examples that follow the Android design guidelines and coding best practices to create a great user experience that's uniquely Android," says Reto Meier, Tech Lead Android Developer Relations Team and fake doctor co-host of The App Clinic. Inclusion on this featured list requires apps to follow some specific criteria, and also some non-specific characteristics described as "magical" and "delightful." Before submitting your app to be reviewed, make sure you've followed the Android app quality guidelines for tablets and phones. Since design is included in the feature selection process, you should also follow the official Android Design Guidelines. Each episode of The App Clinic offers a wealth of constructive advice for developers, straight from guys who know Android best. After all, it's their job. Here are some of the key messages from the video:

Basic Pure Android Guidelines
At time marker 23:06:- Google Play Assets: Does the app display icons and feature graphics that make it easy for shoppers to understand the app and it's intended uses? Being pretty helps, too.
- App Quality Guidelines: Test time. Did you follow the guidelines outlined at Developer.Android.com?
- Tablet Quality Guidelines: Does the app perform well on tablet devices as well as phones? Does the app follow the tablet quality guidelines?
- Android Design Guidelines: Does the app follow the Android Design Guidelines and provide a pleasing user interface?
Additional Suggestions
Some concrete, others not so much:- Code Efficiency
- Buttery: Buttery smooth is a term (of endearment?) introduced with Android 4.1 that includes good use of battery life and interface reaction time.
- Magical: The app just works, like magic!
- Delightful: The app just works, and it's wonderful!