Those envious of the Knock Code feature that is harbored on the latest LG devices, if you run Xposed framework on an HTC One M8 you can have the feature too now thanks to developer Mohammad AG. Mohammad is behind the work of various popular Xposed modules, and the latest is this Knock Code module allowing users to do as LG owners do, and tap on their device in a specific sequence to unlock the device. While this is a nice added security layer in addition to the other standard security measures one might set from this device, it unfortunately does not have to ability to wake the screen from sleep by tapping the knock sequence that you set. However Mohammad states that is something that is possible to do after some tweaks are made to the kernel, which we'll likely see from someone down the road.
If you use an HTC M8 and don't already have Xposed framework installed that will be an obvious first step to making this feature available on your device. Some other things to note are that Mohammad is demoing the module working on an HTC M8, but the module is not exclusive to that one device. As he states it is a module for Android devices running HTC Sense, and AOSP devices, so you don't have to own an M8 if have an AOSP device running Xposed. That's the good news. The bad news for those of you who don't like waiting is that this module isn't yet available. The module is in testing at the moment but should be made available to consumer soon enough.
You can check out the short video below to see the feature working on the M8, which as good as we'll be getting at the moment. At least we can see how it performs on a non LG device where the feature isn't native. Are you a fan of Xposed and the different modules that are available for it? What are some other features that you'd like to see be made into a module and brought to other devices?