PocLoc

Locks your phone automatically when kept in pocket. Works based on the proximity sensor.
You need to grant the app a one time permission to lock the screen. The app then locks the screen when it detects objects close to the phone.
The app automatically stops detecting proximity when phone is not in use, to conserve battery.
You can toggle the ON and OFF states of the app from your notification bar or by just launching it. If it is already running, the app will stop else it will start (in both cases, you will be notified).
Note that the app starts automatically the next time you unlock your phone only if you have enabled it.

Important: To uninstall the app, first remove its admin rights in device administrators (Settings->Location and security->Select device administrators) and then uninstall the app.

Recent changes:
Different icons to show the current state of PocLoc.
Vibration on screen lock.