HarmonyOS 拍照和从相册选图片设置头像功能

demo如下：

import { camera, cameraPicker } from '@kit.CameraKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { BusinessError } from '@kit.BasicServicesKit';
import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { picker } from '@kit.CoreFileKit';

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';
  @State uri: string = '';
  private cameraPosition: Array<camera.CameraPosition> = [
    camera.CameraPosition.CAMERA_POSITION_UNSPECIFIED, camera.CameraPosition.CAMERA_POSITION_BACK,
    camera.CameraPosition.CAMERA_POSITION_FRONT, camera.CameraPosition.CAMERA_POSITION_FOLD_INNER
  ];
  private mediaType: Array<cameraPicker.PickerMediaType> = [
    cameraPicker.PickerMediaType.PHOTO, cameraPicker.PickerMediaType.VIDEO
  ];
  async open(){
    try {
      // Configure to launch the rear camera
      let pickerProfile: cameraPicker.PickerProfile = { cameraPosition: this.cameraPosition[1] };
      // Configure to photo mode
      let pickerResult: cameraPicker.PickerResult = await cameraPicker.pick(getContext(this),
        [this.mediaType[0]], pickerProfile);
      // Get video URI
      this.uri = pickerResult.resultUri;
      hilog.info(0x0000, ' ', "the pick pickerResult is:" + JSON.stringify(pickerResult));
    } catch (error) {
      let err = error as BusinessError;
      hilog.error(0x0000, '', `the pick call failed. error code: ${err.code}`);
    }
  }
  async choose(){
    try {
      // 设置图片选择器选项
      const photoSelectOptions = new picker.PhotoSelectOptions();
      // 限制只能选择一张图片
      photoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
      photoSelectOptions.maxSelectNumber = 10;
      // 创建并实例化图片选择器
      const photoViewPicker = new picker.PhotoViewPicker();
      // 选择图片并获取图片URI
      let uris: picker.PhotoSelectResult = await photoViewPicker.select(photoSelectOptions);
      if (!uris || uris.photoUris.length === 0) return;
      console.info('123123uris', JSON.stringify(uris))
      // 获取选中图片的第一张URI
      this.uri = uris.photoUris[0];
    } catch (error) {
      let err: BusinessError = error as BusinessError;
      console.error('PhotoViewPicker failed with err: ' + JSON.stringify(err));
    }
  }
  build() {
    Column() {
      Image(this.uri)
        .width(200)
        .height(200)
        .borderRadius(100)
        .backgroundColor(Color.Gray)
      Button('打开相机').onClick(()=>{
        this.open()
      })
      Button('选择图片').onClick(()=>{
        this.choose()
      })
    }
    .justifyContent(FlexAlign.Start)
    .alignItems(HorizontalAlign.Center)
    .height('100%')
    .width('100%')
  }
}