My android app is not in the app store yet. Is it possible to send my app to someone, and they install it on their device. Something like iphone AdHoc?
Starting in May 2013, Google added Beta and Alpha programs to the Developer Console. You can now upload an APK to either channel and interested users (or users belonging to the specified Google+ Communities or Groups) can now get the application from the Market just like a regular app.
Users cannot provide public feedback so you have to provide them an alternative way to contact you.
At any given time, you can promote (or demote) an app to/from beta/alpha or even Production.
Here's how mine looks: