"Quick Tap" (double-tap the back of the phone). This can be set up in Settings > System > Gestures .
To use a flashlight (fonarik) on an Android device, you generally have three main ways to access it without needing to download extra apps. 1. The Quick Settings Menu (Fastest) fonariki android
You can often set the Side Key (power button) to open the flashlight by double-pressing it. This is found in Settings > Advanced Features > Side key . "Quick Tap" (double-tap the back of the phone)
This is the standard way to toggle your light on most modern Android phones. fonariki android