Two months ago, we took a look at an innovative alternative use for NFC tags. Rather than activating when touching a device to a tag, XDA Forum Member madfish73 came up with a method to perform actions when removing a device from an NFC tag. To accomplish this, madfish73 showed us how to modify a device’s NFC.apk to add in the android.nfc.action.TAG_LOST intent and then use that to activate tasks with a modified AnyTag application.
Naturally, this was a bit of a cumbersome process, and many users who would otherwise benefit ended up passing on the idea because of the inherent hassle. Luckily, Recognized Developer rovo89 created the powerful and versatile Xposed framework, which made the installation of various types of modifications as simple as installing a module APK and activating it. Madfish73 has since turned his modification into an Xposed module, allowing you to install with minimal strife.
Just as before, you are able to create tags that perform certain actions when placing and removing a tag. Madfish73 gives a couple of examples of useful tag profiles such for use on a bedside night table and in your car dock, but the possibilities are (almost) endless.
If you held off before due to the complexity of the modifications required, now’s your chance. Head over to the original thread to get started.