如何将CameraX与PreviewView一起使用? [英] How to use CameraX with PreviewView?

问题描述

我不知道如何将camerax与Previewview一起使用.

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

推荐答案

下面是一个如何将camerax与previewview一起使用的示例，该代码使用了CameraX的最新版本，即camera-camera2版本1.0.0-beta07，以及相机视图版本1.0.0-alpha14.

Here is an example of how to use camerax with previewview, the code uses the latest versions of CameraX, meaning camera-camera2 version 1.0.0-beta07, and camera-view version 1.0.0-alpha14.

@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) {
        
 previewView.setPreferredImplementationMode(PreviewView.ImplementationMode.SURFACE_VIEW);

        Preview preview = new Preview.Builder().setTargetAspectRatio(AspectRatio.RATIO_4_3).
                setTargetRotation(previewView.getDisplay().getRotation())
                .build();


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

        preview.setSurfaceProvider(previewView.createSurfaceProvider());

        cameraProvider.bindToLifecycle(this, cameraSelector,preview);

    }

<?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>

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