PreviewView Not Updated After Calling SetLinearZoom

Nathan Sokalski 4,116 Reputation points
2023-02-27T20:47:36.7866667+00:00

I am trying to zoom in/out on PreviewView using SetLinearZoom. I do this using the following line of code:

this.pvPreview.Controller.SetLinearZoom(value);

pvPreview is my PreviewView, this.pvPreview.Controller has been set to a LifecycleCameraController, and value is a float from 0.0 to 1.0, but my PreviewView is not updated. Is there something else I need to do?

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  1. Leon Lu (Shanghai Wicresoft Co,.Ltd.) 68,261 Reputation points Microsoft Vendor
    2023-02-28T02:53:18.94+00:00

    Hello,

    You need to get CameraControl, then you can set the SetLinearZoom.

    Firstly, you need to find the cameraProvider.BindToLifecycle, then get the CameraControl like following code.

    // Bind use cases to camera
    CameraControl = cameraProvider.BindToLifecycle(this, cameraSelector, preview, imageCapture, imageAnalyzer).CameraControl;
    

    In the end, you can setLinearZoom, for testing, I change the linearzoom in the button click event like following code.

    AndroidX.Camera.Core.ICameraControl  CameraControl;
            float zoomrate = 0.1f;
            private void Camera_Move_button_Click(object sender, System.EventArgs e)
            {
                zoomrate += 0.1f;
                CameraControl.SetLinearZoom(zoomrate);
            }
    

    Best Regards,

    Leon Lu


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