I am trying to stop/pause the camera PreviewView during image processing/detection using Firebase MLKit. To pause the preview I call
cameraProvider.unbind(previewUseCase)
That stops the preview on the last frame but now I dont know how to restart it. I tried just binding the preview again like this
cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, preview)
But that causes the PreviewView to just show white like its gone and cant get it back ntil restart the app.
The same thing happens when I call unbindAll()
So my question is how do I pause the preview view and then restart it again at a later point?
this is my code
fun setupCamera(windowManager: WindowManager, previewView: PreviewView){
_cameraProvider = _cameraProviderFuture.get()
_preview = Preview.Builder()
.setTargetRotation(windowManager.defaultDisplay.rotation)
.build()
_preview.setSurfaceProvider(previewView.previewSurfaceProvider)
_cameraSelector = CameraSelector.Builder()
.requireLensFacing(_requiredCameraLens)
.build()
_imageAnalyzer = ImageAnalysis.Builder()
.setTargetResolution(Size(_imageWidth, _imageHeight))
.setBackpressureStrategy(_imageBackpressureStrategy)
.build()
_imageAnalyzer.setAnalyzer(_imageExecutor,_analyzer)
startPreview()
_cameraProvider.bindToLifecycle(_lifecycleOwner, _cameraSelector, _imageAnalyzer)
}
// Called after image processing has finished
fun startPreview(){
_cameraProvider.bindToLifecycle(_lifecycleOwner, _cameraSelector, _preview)
}
// Called when object is detected in an image
fun stopPreview(){
_cameraProvider.unbind(_preview)
}