Preview View stretched on SM-G570M

[Jonathan Beutke]

Hello!.

The previewView on this device (SM-G570M) is stretched.

I've tried a lot of things, but I can't fix it.

Library Version: (same issue in all versions)

androidx.camera:camera-camera2:1.0.0-beta11

androidx.camera:camera-view:1.0.0-alpha18

Source code

Aspect ratio:

        private fun aspectRatio(width: Int, height: Int): Int {
            val previewRatio = max(width, height).toDouble() / min(width, height)
            if (abs(previewRatio - RATIO_4_3_VALUE) <= abs(previewRatio - RATIO_16_9_VALUE)) {
                return AspectRatio.RATIO_4_3
            }
            return AspectRatio.RATIO_16_9
        }

Preview Builder:

        val screenAspectRatio = aspectRatio(Utils.getDisplayWidth(applicationContext), Utils.getDisplayHeight(applicationContext))
        
        imagePreview = Preview.Builder().apply {
            setTargetAspectRatio(screenAspectRatio)
            setTargetRotation(preview_view.display.rotation)
        }.build()
        
        
        preview_view.scaleType = PreviewView.ScaleType.FILL_CENTER
        
        imagePreview.setSurfaceProvider(preview_view.surfaceProvider)

Thanks in advance!

[Xi Zhang (张熹)]

Could you try setting the target aspect ratio to RATIO_16_9? e.g. for you aspectRatio() function to always return AspectRatio.RATIO_16_9.

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[Jonathan Beutke]

Hi! Thanks for your reply.

With RATIO_16_9 I still have the same problem

[Jonathan Beutke]

Hi,

I still can't solve this issue, even with the latest version of camera-view. 

It only occurs on the SM-G570M device.

I need to know if this bug is tracked or will I have to code everything again with camera2.  :(

Thanks!

[Xi Zhang (张熹)]

Sorry for the late reply. Probably a similar issue to https://issuetracker.google.com/issues/180121821 If that's the case, camera2 should be the same. Please let me know if somehow camera2 works for you.

As for fix, we can apply a similar device specific workaround for the issue. If it's urgent, you can try to workaround it yourself. Basically you need to manually apply an additional transform to PreviewView for that specific device. e.g. setScaleY(1.33f).

[Xi Zhang]

I am not able to repro the issue with SM-G570M. Could you try if the CameraXBasic app works? https://github.com/android/camera-samples/tree/master/CameraXBasic

And could you try removing the `setTargetAspectRatio(screenAspectRatio)` line from your code?

[Jonathan Beutke]

Hi!

I have tried cameraXBasic and other apps on the Play Store that use cameraX and I see the same problem.

Removing setTargetAspectRatio(screenAspectRatio), i get the same issue.

Adding setScaleY(1.33f) in the preview solves the problem, but drawing over preview view results in wrong coordinates :(

[Xi Zhang (张熹)]

What is your Android version? Mine is 6.0.1, later upgraded to 7.0 but still couldn't reproduce it. Also, could you try setting the PreviewView to COMPATIBLE mode?

[Jonathan Beutke]

With Compatible Mode is the same.

Android 8.0.0

--

Enviado desde mi iPhone

[Xi Zhang (张熹)]

I can reproduce the issue after upgrading to 8.0.0.  I will look for a solution.

[Jonathan Beutke]

Ok, Thank you!

[Xi Zhang (张熹)]

The issue is fixed and it will go out with the next release. See: https://android-review.googlesource.com/c/platform/frameworks/support/+/1647928

As for the coordinates transform are off, we are currently working on an API that will take care of the transformation. Please stay tuned.