鸿蒙开发融云demo发送图片消息

融云鸿蒙版是不带UI的，得自己一步步搭建。
这次讲如何发送图片消息，选择图片，显示图片消息。
还是有点难度的，好好看，好好学。

一、思路：

选择图片用：photoViewPicker.select

二、效果图：

在这里插入图片描述

三、关键代码：

/**
   * 选择图片
   * 注：官方说不用申请权限
   */
  public static  openGallery(maxSelectNumber:number,callBack:(result:string[])=>void) {
    if(maxSelectNumber){
      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 = maxSelectNumber; // 选择媒体文件的最大数目

      const photoViewPicker = new photoAccessHelper.PhotoViewPicker();
      photoViewPicker.select(photoSelectOptions).then((photoSelectResult: photoAccessHelper.PhotoSelectResult) => {
        if (photoSelectResult.photoUris.length > 0) {
          callBack(photoSelectResult.photoUris)
        }
      }).catch((err: BusinessError) => {
        console.error(`Invoke photoViewPicker.select failed, code is ${err.code}, message is ${err.message}`);
      })
    }else {
      showToast('已选素材数量达到上限')
    }
  }

public static sendImageMessage(targetId: string, localPath: string,successCallBack?:()=>void) {
    let conId = new ConversationIdentifier();
    conId.conversationType = ConversationType.Private;
    conId.targetId = targetId;

    let imageMsg = new ImageMessage();
    imageMsg.localPath = localPath;

    let msgSrc = new Message(conId, imageMsg);
    let option: ISendMsgOption = {};
    let msgAfter: Message = msgSrc
    IMEngine.getInstance().sendMediaMessage(msgSrc, option, (msg: Message) => {
      // 消息保存到数据库
      msgAfter = msg
      msgAfter.sentStatus = SentStatus.Sending
      // 这边会填消息
      EventKeys.postEvent(EventKeys.ReceivedImMessageEvents,ReceivedImMessageEvent(msgAfter))
    }, (msg: Message, progress: number) => {
      // 媒体上传进度 [1 ~ 100]
    }).then(result => {
      if (EngineError.Success !== result.code) {
        //发送消息失败
        msgAfter.sentStatus = SentStatus.Failed
        EventKeys.postEvent(EventKeys.ReceivedImMessageEvents,ReceivedImMessageEvent(msgAfter))
        return;
      }
      if (!result.data) {
        // 消息为空
        // 成功的状态，但是理论上不会出现发送消息成功，但是消息体为空的情况,暂时不处理，避免发送多次通知
        // msgAfter.sentStatus = SentStatus.Sent
        // emitter.emit(EventKeys.RECEIVED_IM_MESSAGE_EVENT, ReceivedImMessageEvent(msgAfter))
        return;
      }
      let msg = result.data as Message;
      EventKeys.postEvent(EventKeys.ReceivedImMessageEvents,ReceivedImMessageEvent(msg))
      // 刷新会话列表，不打算自己插入会话
      EventKeys.postEvent(EventKeys.RefreshMsgListEvents)
      successCallBack?.()
    })

  }