HarmonyOS 鸿蒙Next图片上传竖图变横图

图片自身EXIF中保留图片旋转角度orientation,所以image组件旋转展示

1. 通过getImageProperty获取当前图片旋转角度
2. 将piexMap旋转后展示

import { photoAccessHelper } from '@kit.MediaLibraryKit';
import { BusinessError } from '@kit.BasicServicesKit';
import fs from '@ohos.file.fs';
import { common } from '@kit.AbilityKit';
import picker from '@ohos.file.picker';
import { fileIo } from '@kit.CoreFileKit';
import { promptAction } from '@kit.ArkUI';
import image from '@ohos.multimedia.image';

// 获取应用文件路径
let context = this as common.UIAbilityContext;

async function savePhotoToGallery(context: common.UIAbilityContext) {
  let helper = photoAccessHelper.getPhotoAccessHelper(context);
  try {
    // onClick触发后5秒内通过createAsset接口创建图片文件，5秒后createAsset权限收回。
    let uri = await helper.createAsset(photoAccessHelper.PhotoType.IMAGE, 'jpg');
    // 使用uri打开文件，可以持续写入内容，写入过程不受时间限制
    let file = await fileIo.open(uri, fileIo.OpenMode.READ_WRITE | fileIo.OpenMode.CREATE);
    context.resourceManager.getMediaContent($r('app.media.123_2').id, 0)
      .then(async value => {
        let media = value.buffer;
        // 写到媒体库文件中
        await fileIo.write(file.fd, media);
        await fileIo.close(file.fd);
        promptAction.showToast({ message: '已保存至相册！' });
      });
  } catch (error) {
    const err: BusinessError = error as BusinessError;
    console.error(`Failed to save photo. Code is ${err.code}, message is ${err.message}`);
  }
}

@Entry
@Component
struct xxxxx{
  @State url: string = ''
  @State pixelMap: image.PixelMap|undefined =undefined

  build() {
    Column() {
      SaveButton({
        text: SaveDescription.SAVE_TO_GALLERY,
        buttonType: ButtonType.Capsule,
        icon: SaveIconStyle.FULL_FILLED
      })
        .onClick(async (event: ClickEvent, result: SaveButtonOnClickResult) => {
          if (result === SaveButtonOnClickResult.SUCCESS) {
            const context: common.UIAbilityContext = this as common.UIAbilityContext;
            // 免去权限申请和权限请求等环节，获得临时授权，保存对应图片
            savePhotoToGallery(context);
          } else {
            promptAction.showToast({ message: '设置权限失败！' })
          }
        })
      Button('上传')
        .onClick(() => {
          try {
            const photoSelectOptions = new photoAccessHelper.PhotoSelectOptions();

            photoSelectOptions.MIMEType = photoAccessHelper.PhotoViewMIMETypes.IMAGE_TYPE; // 过滤选择媒体文件类型为IMAGE
            photoSelectOptions.maxSelectNumber = 5; // 选择媒体文件的最大数目

            let uris: Array<string> = [];
            const photoViewPicker = new photoAccessHelper.PhotoViewPicker();
            photoViewPicker.select(photoSelectOptions).then(async (photoSelectResult: photoAccessHelper.PhotoSelectResult) => {
              uris = photoSelectResult.photoUris;
              let file = fs.openSync(uris[0], fs.OpenMode.READ_ONLY);
              console.info('file fd: ' + file.fd);
              let imageSource: image.ImageSource = image.createImageSource(file.fd)

              let options: image.ImagePropertyOptions = { index: 0, defaultValue: '9999' }
              //查看当前图片旋转角度
              let Orientation = await imageSource.getImageProperty(image.PropertyKey.ORIENTATION, options) //图片方向 Right-top
              console.error('Orientation:'+Orientation)

              if (Orientation==='Right-top') {
                let decodingOptions: image.DecodingOptions = {
                  editable: true,
                  desiredPixelFormat: 3,
                }
                let pixelMap = imageSource.createPixelMapSync(decodingOptions)
                //旋转九十度
                await pixelMap.rotate(90)
                this.pixelMap = pixelMap
              } else {
                console.error('其他旋转方向xxxxxxxxxxx')
              }
              console.info('photoViewPicker.select to file succeed and uris are:' + uris);
            }).catch((err: BusinessError) => {
              console.error(`Invoke photoViewPicker.select failed, code is ${err.code}, message is ${err.message}`);
            })
          } catch (e) {
            console.error(JSON.stringify(e))
          }
        })

      Image(this.pixelMap)
        .onError((msg)=>{
          console.error('onError:'+JSON.stringify(msg))
        })
        .onComplete((msg)=>{
          console.log('onComplete:'+JSON.stringify(msg))
        })
    }
  }
}