Get angle of view of android camera device

Question

I want to know the angle of view from the camera, just like in this question but using android.hardware.camera2. How can I reproduce the next code using the new camera2 library.

Answer 1

I search the google a person show possibility which he calculate FOV by Camera2 api

https://photo.stackexchange.com/questions/54054/calculating-the-field-of-view-for-a-nexus-5

and found the equation

http://www.bobatkins.com/photography/technical/field_of_view.html

FOV (rectilinear) = 2 * arctan (frame size/(focal length * 2))

thus, we need to know frame size and focal length

the frame size is size of camera you can find the code on below link

https://stackoverflow.com/a/30403558

also, focal length you can find below link

Manual focus in camera2, android

and i combine the code like this

A function calculateFOV() calculate FOV angle

https://github.com/pchan1401-ICIL/Camera2FOV