HarmonyOS 如何打开系统相册页面

Button("拉起图库").onClick(()=>{ 
  try { 
    let PhotoSelectOptions = new picker.PhotoSelectOptions(); 
    PhotoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE; 
    PhotoSelectOptions.maxSelectNumber = 5; 
    let photoPicker = new picker.PhotoViewPicker(); 
    photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult) => { 
      console.info('PhotoViewPicker.select successfully, PhotoSelectResult uri: ' + JSON.stringify(PhotoSelectResult)); 
    }).catch((err:Error) => { 
      console.error('PhotoViewPicker.select failed with err: ' + err); 
    }); 
  } catch (err) { 
    console.error('PhotoViewPicker failed with err: ' + err); 
  } 
}).margin(10) 
 
Button("唤起相机").onClick(async ()=>{ 
  let context = getContext(this) as common.UIAbilityContext; 
  try { 
    let pickerProfile: cameraPicker.PickerProfile = { 
      cameraPosition: camera.CameraPosition.CAMERA_POSITION_FRONT, 
      videoDuration: 3 
    }; 
    let pickerResult: cameraPicker.PickerResult = await cameraPicker.pick(context, 
      [cameraPicker.PickerMediaType.PHOTO], pickerProfile); 
    console.log("the pick pickerResult is:" + JSON.stringify(pickerResult)); 
  } catch (err) { 
    console.error(`the pick call failed. error code: ${err.code}`); 
  } 
}).margin(10)