Most videos showing these apps "working" are edited in post-production to make it look like the phone is projecting an image. Real Alternatives That Actually Work
Hardware is the limiting factor here. A real projector requires a high-intensity light source, a dedicated lens system, and a cooling fan—components that simply do not exist inside a standard Android smartphone. Your phone’s flashlight is a single LED designed to flood a small area with light; it doesn’t have the optical capability to focus an image or data into a projected beam. What are "Holo Flash" and "Projector Simulator" Apps? holo flash projector app fixed download for android
Because this app is often removed from the Google Play Store (due to “misleading visual effects” policies), you’ll need to sideload it. Most videos showing these apps "working" are edited