Is it possible to use AndroidX CameraX API on minimum SDK version less than 21?
There is not. As noted in the official CameraX overview , it only has backward compatibility to Android 5.0 (API level 21).
This page also hints at the reason for this: It makes use of the camera2
API, which was added in API level 21 . Previously, there was a different (and less powerful) camera API, so adding full backward compatibility would probably be impossible, and even partial backward compatibility would be non-trivial.
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