How to use CameraX with PreviewView?

Question

I can't find out how to use camerax with previewview.

Answer 1

Here is an example of how to use Camerax with PreviewView, the code uses the latest versions of CameraX, meaning camera-camera2 version 1.1.0-beta01, and camera-view version 1.1.0-beta01.

@Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        previewView = view.findViewById(R.id.preview_view);
  

        setCameraProviderListener();

    }

private void setCameraProviderListener() {
        ListenableFuture<ProcessCameraProvider> cameraProviderFuture =
                ProcessCameraProvider.getInstance(requireContext());
        cameraProviderFuture.addListener(() -> {

            try {
                ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
                bindPreview(cameraProvider);
            } catch (ExecutionException | InterruptedException e) {
                // No errors need to be handled for this Future
                // This should never be reached
                e.printStackTrace();
            }
        }, ContextCompat.getMainExecutor(requireContext()));
    }

 private void bindPreview(ProcessCameraProvider cameraProvider) {
        
        imageAnalyser();
        imageCapture();

        CameraSelector cameraSelector =
                new CameraSelector.Builder().requireLensFacing(CameraSelector.LENS_FACING_BACK).build();


        Preview preview = new Preview.Builder().build();

        preview.setSurfaceProvider(previewView.getSurfaceProvider());

        ViewPort viewPort = previewView.getViewPort();

        if (viewPort != null) {
            UseCaseGroup useCaseGroup = new UseCaseGroup.Builder()
                    .addUseCase(preview)
                    .addUseCase(imageAnalyzer)
                    .addUseCase(imageCapture)
                    .setViewPort(viewPort)
                    .build();

            cameraProvider.unbindAll();
            Camera camera = cameraProvider.bindToLifecycle(this, cameraSelector, useCaseGroup);
            CameraControl cameraControl = camera.getCameraControl();
            cameraControl.setLinearZoom((float)0.3);
        }


    }

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.camera.view.PreviewView
        android:id="@+id/preview_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/Yellow"
        android:layout_gravity="center" />

</LinearLayout>

Answer 2

Here is an article that explains PreviewView and how to use it. It's valid up to version 1.0.0-alpha10 of camera-view, I'll try to keep it up to date.