HarmonyOS 鸿蒙Next 相册/拍照 压缩 上传 能提供一下官方demo吗

拍照上传头像demo：

import { camera, cameraPicker } from '@kit.CameraKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
import { BusinessError } from '@kit.BasicServicesKit';
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%')
  }
}

关于图片压缩可以使用ImagePacker

参考官方文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-references/js-apis-image-V5#imagepacker

选择相册图片将文件保存到应用沙箱目录。

参考以下demo:

import picker from '@ohos.multimedia.cameraPicker'
import camera from '@ohos.multimedia.camera';
import common from '@ohos.app.ability.common';
import { BusinessError } from '@ohos.base';
import fileuri from '@ohos.file.fileuri';
import fs from '@ohos.file.fs';
import photoAccessHelper from '@ohos.file.photoAccessHelper';

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

class CameraPosition {
  cameraPosition: camera.CameraPosition
  saveUri: string

  constructor(cameraPosition: camera.CameraPosition, saveUri: string) {
    this.cameraPosition = cameraPosition
    this.saveUri = saveUri
  }
}

let pathDir = getContext().filesDir;
console.log('保存路径为' + pathDir)
let filePath = pathDir + '/picture.jpg'
fs.createRandomAccessFileSync(filePath, fs.OpenMode.CREATE);
let uri = fileuri.getUriFromPath(filePath);

async function photo() {
  try {
    let pickerProfile = new CameraPosition(camera.CameraPosition.CAMERA_POSITION_BACK, uri)
    let pickerResult: picker.PickerResult = await picker.pick(context,
      [picker.PickerMediaType.PHOTO, picker.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}`);
  }
}

async function picture() {
  let PhotoSelectOptions = new photoAccessHelper.PhotoSelectOptions();
  PhotoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE;
  PhotoSelectOptions.maxSelectNumber = 1;
  let photoPicker = new photoAccessHelper.PhotoViewPicker();
  photoPicker.select(PhotoSelectOptions).then((PhotoSelectResult: photoAccessHelper.PhotoSelectResult) => {
    let photouri: Array<string> = PhotoSelectResult.photoUris
    let file = fs.openSync(photouri[0], fs.OpenMode.READ_ONLY)
    let file2 = fs.openSync(pathDir + '/picture2.jpg', fs.OpenMode.READ_WRITE | fs.OpenMode.CREATE)
    fs.copyFileSync(file.fd, file2.fd)
    fs.closeSync(file);
    fs.closeSync(file2);
  })
}

@Entry
@Component
export struct Index {
  build() {
    Column() {
      Button('选择并保存').onClick(() => {
        picture()
      })
      Button('拍照并保存').onClick(() => {
        photo()
      })
    }
  }
}

Image组件不能直接传入应用沙箱路径，需要传入应用沙箱uri。

https://developer.huawei.com/consumer/cn/doc/harmonyos-faqs-V5/faqs-arkui-154-V5

将PixelMap压缩到指定大小以下

https://developer.huawei.com/consumer/cn/doc/harmonyos-faqs-V5/faqs-image-16-V5