LG recently has launched a new feature called Knock Code in the recent phones, now if you are missing this security feature in your non LG device and want to be in your phone then you can do it via Xposed.
You will just need to set the stock Android 3*3 grid pattern in settings, after that, set a knock code pattern in the app and
You will just need to set the stock Android 3*3 grid pattern in settings, after that, set a knock code pattern in the app and