790 Texting While Walking

I wonder if this idea is possible, but I assume it may be, that the way to avoid bumping into other people in crowded street when texting while walking. If your smartphone or tablet recognize by some sort of sensing technology that you are going to face with people or any other thing coming in front of you, the machine will soon shut down the ongoing application and activate an alert on screen, or simply black out. I think the function, if possible, will meet mixed reputation and might be criticized that it's not user-friendly. Then it's a good thing, because the function will be reviewed, improved, updated and sophisticated.