在Android上，可以使用Camera2 API来实现HdrViewFinder的示例。以下是一个简单的示例代码，该代码在纵向模式下使用Google示例HdrViewFinder：

1. 首先，确保你的项目中已经导入了Camera2 API的相关依赖库。

2. 创建一个名为HdrViewFinderActivity的Activity，并在布局文件中添加一个TextureView，用于显示相机预览：

3. 在HdrViewFinderActivity类中，实现相机相关的逻辑。下面是一个简单的示例代码：

public class HdrViewFinderActivity extends AppCompatActivity {

    private TextureView textureView;

    private CameraDevice cameraDevice;
    private CaptureRequest.Builder previewRequestBuilder;
    private CameraCaptureSession cameraCaptureSession;
    private Size previewSize;

    private CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() {
        @Override
        public void onOpened(@NonNull CameraDevice camera) {
            cameraDevice = camera;
            createCameraPreviewSession();
        }

        @Override
        public void onDisconnected(@NonNull CameraDevice camera) {
            cameraDevice.close();
        }

        @Override
        public void onError(@NonNull CameraDevice camera, int error) {
            cameraDevice.close();
        }
    };

    private CameraCaptureSession.StateCallback sessionCallback = new CameraCaptureSession.StateCallback() {
        @Override
        public void onConfigured(@NonNull CameraCaptureSession session) {
            if (cameraDevice == null) {
                return;
            }
            cameraCaptureSession = session;
            updatePreview();
        }

        @Override
        public void onConfigureFailed(@NonNull CameraCaptureSession session) {
            Toast.makeText(getApplicationContext(), "Failed to configure camera", Toast.LENGTH_SHORT).show();
        }
    };

    private void openCamera() {
        CameraManager cameraManager = (CameraManager) getSystemService(Context.CAMERA_SERVICE);
        try {
            String cameraId = cameraManager.getCameraIdList()[0]; // Use the first camera
            CameraCharacteristics characteristics = cameraManager.getCameraCharacteristics(cameraId);
            StreamConfigurationMap map = characteristics.get(CameraCharacteristics.SCALER_STREAM_CONFIGURATION_MAP);
            previewSize = map.getOutputSizes(SurfaceTexture.class)[0]; // Use the first available preview size

            if (ActivityCompat.checkSelfPermission(this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                return;
            }
            cameraManager.openCamera(cameraId, stateCallback, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void createCameraPreviewSession() {
        try {
            SurfaceTexture texture = textureView.getSurfaceTexture();
            texture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight());
            Surface surface = new Surface(texture);

            previewRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            previewRequestBuilder.addTarget(surface);

            cameraDevice.createCaptureSession(Arrays.asList(surface), sessionCallback, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    private void updatePreview() {
        if (cameraDevice == null) {
            return;
        }
        try {
            previewRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
            cameraCaptureSession.setRepeatingRequest(previewRequestBuilder.build(), null, null);
        } catch (CameraAccessException e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hdr_view_finder);

        textureView = findViewById(R.id.textureView);
        textureView.setSurfaceTextureListener(surfaceTextureListener);
    }

    private TextureView.SurfaceTextureListener surfaceTextureListener = new TextureView.SurfaceTextureListener() {
        @Override
        public void onSurfaceTextureAvailable(SurfaceTexture surfaceTexture, int width, int height) {
            openCamera();
        }

        @Override
        public void onSurfaceTextureSizeChanged(SurfaceTexture surfaceTexture, int width, int height) {
            // Handle surface texture size change
        }

        @Override
        public boolean onSurfaceTextureDestroyed(SurfaceTexture surfaceTexture) {
            return false;
        }