Perform an Up gesture and react to it in Tasker. To do this you need to first enable Gestures mode with the "AutoInput Modes" Tasker action. Press the (i) icon on that screen for more info on how this mode works. Then setup a new Tasker profile with the "AutoInput Gesture" event condition and select the "Up" gesture. In the task do anything you want. This can be handy for when you're in your car for example, and you want to not have to press buttons on screen and control everything with gestures