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Asked: 2026-06-12T15:02:03+00:00

I am facing difficulties in implementing a custom camera view. The task I want

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I am facing difficulties in implementing a custom camera view.

The task I want to achieve is –
in camera preview I got a preview picture (in previewcallback function).
I zoom it and then I want to draw the zoomed version of the image in the camera view.

In previewcallback function I got image pixel values as byte array. But in canvas.drawImage it accepts int array. Can anyone suggest me how does the pixel data is organized in the byte array within the previewcallback function?

I tried to lock the surfaceview but it didn’t help. It returns null so I cannot draw anything on that surface.

Any suggestions?
thanks.

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1 Answer

  1. Editorial Team

    As said previously, NV21 is default and has to be provided always – this means you can rely on it and you shal rely on it if you like to be compatible with other devices. As for locking surface view – surface view you are using for preview is off limits for you since it is already locked by camera applciation ( which is nativeand runs in own process ) – if you like to use it, you will have to stop preview on it so camera app releases this surface ( hopefully )

    Bad news is that you can not place another surface view on top of the first with frame layout
    ( this is limitation of surface views, they can not overlap ), but good news is that you can place image view oevr it and draw your bitmap there ( via runOnuiThread() )

    You can find example how to do this in our javaOCR project

    ( see android demos, please use git repo as it is current )

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