It seems that the next smartphone trend after notches are button-less, swipe-based, pill-using navigation gestures. And, like the notch, we have Apple and its iPhone X to thank, or curse, for that. Android P will unabashedly have its own gestured-based navigation UI. If you're a fan of that feature, however, you need not wait that long or forever to get it. The folks over at XDA have released their own Navigation Gestures app that offers exactly that and a lot more. But while the app doesn't require root access, you'll need to aware of two important things before you go any further.