Full Screen Video Recording in Front Camera using

I have been stuck in this issue for days.

I followed this Android's official camera-sample in Kotlin: android's camera-sample

I raised an issue on github issue on 11 Feb 2020 but haven't received any feedback.

My problem is:

I used the sample as it is and only changed val cameraId = manager.cameraIdList[0] to val cameraId = manager.cameraIdList[1] for front camera. NOTE: It does not happen in rear camera.

The front camera does not work and shows black bar on devices tested:

Emulator: Pixel C API 29
Device: Galaxy Tab S2
Mode: Portrait

I wanted a full screen view, so when I don't set the aspect ratio of AutoTextureView in the commented line below, the video takes full screen but is now stretched.

if (resources.configuration.orientation == Configuration.ORIENTATION_LANDSCAPE) {
  //I only have portrait mode
} else {
  //textureView.setAspectRatio(previewSize.height, previewSize.width)
}

Is there a way to set full screen mode without any stretching or in a correct aspect ratio?

I have been through following solutions in slack and none worked for me:

Camera 2 : Unable to record video in full screen?

Camera2 API Make Preview Fill Entire View

Android Camera2 API stretching the preview

After working for days. Camera2 full screen preview and image capture helped me solve the problem.

Setting onMeasure in AutoFitTextureView as:

override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec)
    val width = View.MeasureSpec.getSize(widthMeasureSpec)
    val height = View.MeasureSpec.getSize(heightMeasureSpec)
    if (ratioWidth == 0 || ratioHeight == 0) {
        setMeasuredDimension(width, height)
    } else {
        if (width > ((height * ratioWidth) / ratioHeight)) {
            setMeasuredDimension(width, (width * ratioHeight) / ratioWidth)
        } else {
            setMeasuredDimension((height * ratioWidth) / ratioHeight, height)
        }
    }
}

Above code makes the screen full size but had problem of preview not being at the centre

So I translated as follows in configureTransform(viewWidth: Int, viewHeight: Int)

   // adjust the x and y to centre the preview
   val screenWidth = resources.displayMetrics.widthPixels
   val xShift = (viewWidth - screenWidth)/2

   val screenHeight = resources.displayMetrics.heightPixels
   val yShift = (viewHeight - screenHeight)/2
   matrix.setTranslate(-xShift.toFloat(), -yShift.toFloat())

   textureView.setTransform(matrix)