Smooth Zoom

[Raz]

I have watched this video from Android Developers on youtube, and Smooth Zoom was mentioned.

It said that CameraX automatically uses all the cameras for more zoom range - like the default device camera, but for some reason it does not seem to work with my
implementation - min zoom level is 1x unlike the default device camera and in video example which both have zoom level under 1x.

My implementation:

override fun onScale(detector: ScaleGestureDetector?): Boolean {
    val zoomRatio = camera.cameraInfo.zoomState.value?.zoomRatio?.times(detector!!.scaleFactor)
    zoomRatio?.let {
        // Setting new zoom ratio for CameraX
        camera.cameraControl.setZoomRatio(it)
    }
    return true
}

Thanks,

Raz

[Scott Nien]

Hi Raz, 

Good question.  The smooth zoom mentioned in the video is enabled on devices that implement the smooth zoom functionality via CONTROL_ZOOM_RATIO.  Pixel 5 / 6 supports this feature so you can try it if you have one. For other devices, you may check the CONTROL_ZOOM_RATIO_RANGE. If the range has min value smaller than 1.0f,  then the device supports the smooth zoom via CONTROL_ZOOM_RATIO.

 

Scott

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