HarmonyOS 头像修改功能

头像修改可以选择拍照和相册选择照片，可以参考如下demo，权限申请需要在module.json5文件里配置：

import { BusinessError } from '@kit.BasicServicesKit';
import { abilityAccessCtrl, common, PermissionRequestResult, Permissions, Want } from '@kit.AbilityKit';
import { promptAction } from '@kit.ArkUI';
import { fileUri, picker } from '@kit.CoreFileKit';
import fs from '@ohos.file.fs';

const TAG = '[Index]';

@Entry
@Component
struct Index {
  @State path: string = '';
  @State isVideo: boolean = false;

  private context = getContext(this) as common.UIAbilityContext;
  dialogController: CustomDialogController = new CustomDialogController({
    builder: CustomDialogExample({
      cancel: () => {
        this.onCancel()
      },
      takephoto: () => {
        this.onTakePhoto()
      },
      photoalbums: () => {
        this.onPhotoAlbums()
      },
    }),
  })

  build() {
    Row() {
      Column() {
        if (!this.isVideo && this.path) {
          Image(this.path)
            .width(50)
            .height(50)
            .borderRadius(35)
            .objectFit(ImageFit.Auto)
            .onClick(async () => {
              //权限申请+头像编辑实现
              this.ApplyForPermissions();
            })
        } else {
          Image($r('app.media.startIcon'))
            .width(50)
            .height(50)
            .borderRadius(35)
            .objectFit(ImageFit.Auto)
            .onClick(async () => {
              //权限申请+头像编辑实现
              this.ApplyForPermissions();
            })
        }
      }
      .width('100%')
    }
    .height('100%')
  }

  onCancel() {
    console.info('Callback when the onCancel button is clicked')
  }

  onTakePhoto() {
    console.info('Callback when the onTakePhoto button is clicked')
    //拉起系统相机拍照
    this.startAbility('ohos.want.action.imageCapture', 'com.huawei.flexlaout.myapplication');
  }

  async onPhotoAlbums() {
    console.info('Callback when the onPhotoAlbums button is clicked')
    //从相册选择照片
    await this.photoPickerGetUri().then(value => {
      this.isVideo = false;
      this.path = value;
    });
  }

  async photoPickerGetUri(): Promise<string> {
    let uris: Array<string> = [];
    try {
      let PhotoSelectOptions = new picker.PhotoSelectOptions();
      PhotoSelectOptions.MIMEType = picker.PhotoViewMIMETypes.IMAGE_TYPE;
      PhotoSelectOptions.maxSelectNumber = 1;
      let photoPicker = new picker.PhotoViewPicker();
      await photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: picker.PhotoSelectResult) => {
        console.info('PhotoViewPicker.select successfully, PhotoSelectResult uri: ' +
        JSON.stringify(PhotoSelectResult));
        uris = PhotoSelectResult.photoUris;
      }).catch((err: BusinessError) => {
        console.error('PhotoViewPicker.select failed with err: ' + JSON.stringify(err));
      });
    } catch (error) {
      let err = error as BusinessError;
      console.error('PhotoViewPicker failed with err: ' + err.message);
    }
    return uris[0].toString();
  }

  ApplyForPermissions() {
    let permissions: Array<Permissions> = [
      'ohos.permission.WRITE_IMAGEVIDEO',
      'ohos.permission.READ_IMAGEVIDEO',
    ];
    let atManager: abilityAccessCtrl.AtManager = abilityAccessCtrl.createAtManager();
    // requestPermissionsFromUser会判断权限的授权状态来决定是否唤起弹窗
    atManager.requestPermissionsFromUser(this.context, permissions).then((data: PermissionRequestResult) => {
      let grantStatus: Array<number> = data.authResults;
      let length: number = grantStatus.length;
      for (let i = 0; i < length; i++) {
        if (grantStatus[i] != 0) {
          // 用户拒绝授权，提示用户必须授权才能访问当前页面的功能，并引导用户到系统设置中打开相应的权限
          return;
        }
      }
      console.info(`${TAG} Success to request permissions from user. authResults is ${grantStatus}.`);
      //弹框让客户选择头像是通过拍照获取还是从相册选择，同时还有取消按钮
      this.dialogController.open()
    }).catch((err: BusinessError) => {
      console.error(`${TAG} Failed to request permissions from user. Code is ${err.code}, message is ${err.message}`);
    })
  }

  //拉起系统相机
  startAbility(action: string, bundleName: string) {
    let want: Want = {
      action: action,
      parameters: {
        // 拍照完成后返回的应用BundleName
        callBundleName: bundleName,
        supportMultiMode: false
      }
    };
    try {
      this.context.startAbilityForResult(want, (err: BusinessError, result: common.AbilityResult) => {
        if (err.code) {
          // 处理业务逻辑错误
          console.error(TAG, `startAbilityForResult failed, code is ${err.code}, message is ${err.message}`);
          return;
        }
        let uri: string = result?.want?.parameters?.resourceUri as string;
        // 执行正常业务
        console.info(TAG, `Succeeded in starting ability for result. Data is ${JSON.stringify(result)}, uri is ${uri}`);
        if (uri) {
          // 保存到本地
          this.save2Local(uri);
        } else {
          promptAction.showToast({ message: '拍摄失败' })
        }
      });
    } catch (err) {
      let error = err as BusinessError;
      console.error(TAG, `startAbilityForResult failed, err is ${JSON.stringify(error)}`);
      promptAction.showToast({ message: '拍摄失败' })
    }
  }

  save2Local(uri: string) {
    try {
      let file = fs.openSync(uri, fs.OpenMode.READ_ONLY);
      let prefix = uri.substring(uri.lastIndexOf('.') + 1);
      let tempFileName = getContext(this).filesDir + '/' + new Date().getTime() + '.' + prefix;
      let tempFile = fs.openSync(tempFileName, fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE);
      fs.copyFileSync(file.fd, tempFile.fd);
      this.path = fileUri.getUriFromPath(tempFileName);
      this.isVideo = (prefix == 'mp4' || prefix == 'MP4');
      console.info(TAG, `resolve2Sandbox successful.`);
      promptAction.showToast({ message: '拍摄成功' })
    } catch (err) {
      let error = err as BusinessError;
      console.error(TAG, `resolve2Sandbox failed, err is ${JSON.stringify(error)}`);
    }
  }
}

@CustomDialog
struct CustomDialogExample {
  cancel?: () => void
  takephoto?: () => void
  photoalbums?: () => void
  controller: CustomDialogController
  build() {
    Column() {
      Button('拍照')
        .onClick(() => {
          this.controller.close()
          if (this.takephoto) {
            this.takephoto()
          }
        }).backgroundColor(0xffffff).fontColor(Color.Black)
      Button('从相册选择')
        .onClick(() => {
          this.controller.close()
          if (this.photoalbums) {
            this.photoalbums()
          }
        }).backgroundColor(0xffffff).fontColor(Color.Black)
      Button('取消')
        .onClick(() => {
          this.controller.close()
          if (this.cancel) {
            this.cancel()
          }
        }).backgroundColor(0xffffff).fontColor(Color.Black)
    }
  }
}