相机拍照界面应该怎样拉起？

import { common } from '@kit.AbilityKit';
import { camera, cameraPicker } from '@kit.CameraKit';
import { BusinessError } from '@kit.BasicServicesKit';

let context = getContext(this) as common.Context;

async function startCameraPicker() {
  try {
    let pickerProfile: cameraPicker.PickerProfile = {
      cameraPosition: camera.CameraPosition.CAMERA_POSITION_BACK
    };
    let pickerResult: cameraPicker.PickerResult = await cameraPicker.pick(context,
      [cameraPicker.PickerMediaType.PHOTO, cameraPicker.PickerMediaType.VIDEO], pickerProfile);
    console.log("the pick pickerResult is:" + JSON.stringify(pickerResult));
  } catch (error) {
    let err = error as BusinessError;
    console.error(`the pick call failed. error code: ${err.code}`);
  }
}

@Entry
@Component
struct StartCameraPickerView {
  build() {
    Column() {
      Button("点击拉起相机")
        .onClick(() => startCameraPicker())
    }
    .width("100%")
    .height("100%")
    .justifyContent(FlexAlign.Center)
    .alignItems(HorizontalAlign.Center)
  }
}
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