I'm thinking on integrating an Android (3.x?) tablet PC in my car. I want to integrate the tablet in the car panel, so I will not have access to power button. It will be permanently plugged to cigarrete adapter, so, when I start the car, the tablet will have external energy supply, and when I stop the car, the tablet will work with the battery. So, is it possible to turn automatically on/off the Android tablet depending on the external supply if exists or not? I mean, is it possible -using a plugin, app, tweek or energy config- to do this? I would appreciate very much your answer. I'm waiting for a 7" Android 3.x. Any suggestion?