如何拉起相机界面，有人知道吗？

import { common } from '@kit.AbilityKit'; 
import { camera, cameraPicker } from '@kit.CameraKit'; 
import { BusinessError } from '@kit.BasicServicesKit'; 
 
let mContext = getContext(this) as common.Context; 
 
@Entry 
@Component 
struct Index { 
  build() { 
    Column() { 
      Button("点击拉起相机") 
        .onClick(async () => { 
          try { 
            let pickerProfile: cameraPicker.PickerProfile = { 
              cameraPosition: camera.CameraPosition.CAMERA_POSITION_BACK 
            }; 
            let pickerResult: cameraPicker.PickerResult = await cameraPicker.pick(mContext, 
              [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}`); 
          } 
        }) 
    } 
    .width("100%") 
    .height("100%") 
    .justifyContent(FlexAlign.Center) 
    .alignItems(HorizontalAlign.Center) 
  } 
}