https://wccftech.com/xiaomi-mi-mix-will-be-the-first-smartphone-to-have-a-liquid-lens/

Smartphone cameras have come a long, long way from when you would get really mediocre pictures from smartphone cameras. However, things are different now, and most people don't even want a dedicated camera when they have access to a good smartphone camera. While the cameras will not be replacing full-sized cameras any time soon, they have still come a long way. With that said, the upcoming Xiaomi Mi Mix that will be releasing later this month will be the first smartphone that will bring a liquid lens.

The liquid lens in question will be comprised of optical-grade liquid and controlled either mechanically or electronically. Unlike the traditional lenses that are rigid, liquid lenses are tensile and will change focal length on the fly. They are also smaller as compared to the traditional lens.