PreviewView Not Updated After Calling SetLinearZoom

Question

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?

Answer 1

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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