There is a App named Thrive.

The app is still in development phase and available to some selected user via play store  only.

I m using this app for about a month now.

The app has many unique features :

1. The app block your phone for the hours, user selected.
So it actually blocks all calls, texts, notification and even excess to the mobile for a while.
The app send the user customized text message to the person calling or texting.

2. This is actually useful for concentrating in work or study.

3. The app also contain app controller which does not allow you to use app for more than time you have specified in a day.

Some of the screen shots of app :