IssueTracker

Great! Thanks a lot, I'll look for the live updates soon!

By adding some log info in the library side, the issue happens in the following steps when running the sample project provided in comment#1.

• Activity is launched and the 1st pair of CameraController and PreviewView is created. The CameraController is set to the PreviewView by PreviewView#setController.
• Press the thumbup button to create the 2nd pair of Camera CameraController and PreviewView.
• The 1st PreviewView will receive onDetachedFromWindow callback. It will call CameraController#clearPreviewSurface() and then ProcessCameraProvider#unbindAll() will be called.

All use cases are unbound so the camera is closed.

The following log is extracted from the attached log when the issue happens:

10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.camera.lifecycle.LifecycleCameraRepository.suspendUseCases(LifecycleCameraRepository.java:438)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.camera.lifecycle.LifecycleCameraRepository.setInactive(LifecycleCameraRepository.java:394)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.camera.lifecycle.LifecycleCameraRepository.unbindAll(LifecycleCameraRepository.java:334)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.camera.lifecycle.ProcessCameraProvider.unbindAll(ProcessCameraProvider.java:514)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.camera.view.CameraController.clearPreviewSurface(CameraController.java:514)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.camera.view.PreviewView.onDetachedFromWindow(PreviewView.java:277)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.View.dispatchDetachedFromWindow(View.java:21358)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:4649)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.ViewGroup.dispatchDetachedFromWindow(ViewGroup.java:4641)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.ViewGroup.removeViewInternal(ViewGroup.java:6287)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.ViewGroup.removeViewInternal(ViewGroup.java:6258)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.ViewGroup.removeView(ViewGroup.java:6189)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.platform.AndroidComposeView.removeAndroidView(AndroidComposeView.android.kt:466)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.viewinterop.AndroidViewHolder$layoutNode$1$4.invoke(AndroidViewHolder.android.kt:254)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.viewinterop.AndroidViewHolder$layoutNode$1$4.invoke(AndroidViewHolder.android.kt:253)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:370)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:381)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.node.LayoutNode.detach$ui_release(LayoutNode.kt:381)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.node.LayoutNode.removeAt$ui_release(LayoutNode.kt:257)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.node.UiApplier.remove(UiApplier.android.kt:36)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.runtime.ComposerImpl$realizeMovement$1.invoke(Composer.kt:2903)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.runtime.ComposerImpl$realizeMovement$1.invoke(Composer.kt:2903)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.runtime.CompositionImpl.applyChanges(Composition.kt:629)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$2.invoke(Recomposer.kt:479)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$2.invoke(Recomposer.kt:416)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.platform.AndroidUiFrameClock$withFrameNanos$2$callback$1.doFrame(AndroidUiFrameClock.android.kt:34)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.platform.AndroidUiDispatcher.performFrameDispatch(AndroidUiDispatcher.android.kt:109)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.platform.AndroidUiDispatcher.access$performFrameDispatch(AndroidUiDispatcher.android.kt:41)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.doFrame(AndroidUiDispatcher.android.kt:69)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:997)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.Choreographer.doCallbacks(Choreographer.java:797)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.Choreographer.doFrame(Choreographer.java:728)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:984)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.os.Handler.handleCallback(Handler.java:883)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.os.Handler.dispatchMessage(Handler.java:100)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.os.Looper.loop(Looper.java:237)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at android.app.ActivityThread.main(ActivityThread.java:8167)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at java.lang.reflect.Method.invoke(Native Method)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
10-31 00:49:59.042 10102  2039  2039 D XXXXX   : 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)

The issue disappears if resetting CameraController when new PreviewView is created.

var previewView : PreviewView? = null

@Composable
fun CameraPreview(flashEnabled: Boolean, modifier: Modifier = Modifier) {
    val lifecycleOwner = LocalLifecycleOwner.current
    val context = LocalContext.current

    // Resets CameraController from the previous PreviewView
    previewView?.controller = null

    val controller = remember {
        LifecycleCameraController(context).apply {
            cameraSelector = CameraSelector.Builder()
                .requireLensFacing(CameraSelector.LENS_FACING_BACK)
                .build()
        }
    }

    DisposableEffect(true) {
        Log.d("XXXXX","DisposableEffect++ lifecycleOwner: " + lifecycleOwner)
        controller.bindToLifecycle(lifecycleOwner)
        Log.d("XXXXX","DisposableEffect++")
        onDispose {
        }
    }

    controller.enableTorch(flashEnabled)

    previewView = PreviewView(context)
    previewView!!.controller = controller

    AndroidView(
        factory = { ctx -> previewView!!
        },
        modifier = modifier
    )
}

The solution in the camera-view side will be only unbinding the use cases created by the CameraController instead of directly calling ProcessorCameraProvider#unbindAll().

Attach the bugreport of the log mentioned in comment#4.

The issue is fixed by https://android-review.googlesource.com/1813958 and will be included in CameraX's next release. Update the status to be Fixed.