Creating image capturing feature similar to cam scanner app [closed]

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Closed 4 days ago.

I am trying to make a feature in my app like cam scanner which will click the images of documents, I have tried various ways like with SurfaceView's(here's the issue thread Cropping a full screen camera image bitmap into a Surface view height and width) and,

using this library https://github.com/edmodo/cropper/wiki but the problem with this library is it works after clicking the image while i need a library which works during capturing the image so user can select specific rectangular part to be clicked.

So please suggest me something which can work while clicking the image.

来源：https://stackoverflow.com/questions/61743702/creating-image-capturing-feature-similar-to-cam-scanner-app