For actual projection onto a wall, you must use hardware such as a portable mini projector that connects to your phone via USB-C or HDMI. Google Play Are you interested in building a DIY hologram pyramid for your phone, or are you looking for a portable mini projector recommendation for your Android device? Vyomy 3D Hologram Projector - Apps on Google Play
For users interested in actual projection mapping (using a real projector controlled by a phone), experts recommend these tools: holo flash projector app download for android extra quality