I want to implement the magnifier modifer on my camera preview.
What Im trying right now:
@Composable
fun CameraScreen() {
val previewView = remember { SurfaceView(context) }
Box(Modifier.fillMaxSize()) {
AndroidView(
modifier = Modifier.fillMaxSize(),
factory = { previewView })
Box(
modifier = Modifier
.align(Alignment.Center)
.magnifier(
sourceCenter = { Offset.Zero },
zoom = 2f,
),
)
}
}
But it only draws a box where the magnifier should be, but the box is not magnifying the preview. Anyone have any ideas?
The magnifer modifier does not work directly with AndroidView as it is designed for composable content.To apply magnification over a camera preview, render the preview using a TextureView or SurfaceView and integrate it into Compose via AndroidView. For magnification, overlay a composable with the magnifier modifier on top of the preview. Alternatively, capture the preview into a composable layer using Modifier.graphicsLayer for seamless Compose integration.
@Composable
fun CameraScreen() {
val context = LocalContext.current
val lifecycleOwner = LocalLifecycleOwner.current
// PreviewView setup
val previewView = remember {
PreviewView(context).apply {
layoutParams = ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT
)
}
}
// Start camera with previewView
LaunchedEffect(Unit) {
val cameraProvider = ProcessCameraProvider.getInstance(context).get()
val preview = Preview.Builder().build().also {
it.setSurfaceProvider(previewView.surfaceProvider)
}
val cameraSelector = CameraSelector.DEFAULT_BACK_CAMERA
cameraProvider.bindToLifecycle(lifecycleOwner, cameraSelector, preview)
}
// Compose layout with magnifier
Box(Modifier.fillMaxSize()) {
AndroidView(
modifier = Modifier.fillMaxSize(),
factory = { previewView }
)
// Apply magnifier on top of the preview
Box(
modifier = Modifier
.align(Alignment.Center)
.magnifier(
sourceCenter = { Offset.Zero }, // Customize based on interaction
zoom = 2f
)
.size(100.dp), // Size of the magnification effect
)
}
}