Flutter高仿微信系列共59篇，从Flutter客户端、Kotlin客户端、Web服务器、数据库表结构、Xmpp即时通讯服务器、视频通话服务器、腾讯云服务器全面讲解。

 详情请查看

效果图：

 详情请参考Flutter高仿微信-第44篇-群聊， 这里只是群聊的图片实现代码。

实现代码：

/**
 * 显示群图片
 * @serverImageUrl 服务器图片地址
 * @localImageUrl 本地图片地址
 */
static Widget showGroupChatImage(String serverImageUrl,String localImageUrl, {double width = 50, double height = 50, double angle = 4, final onPressed}){

  String defaultImageUrl = "assets/images/base/base_error.png";
  Widget childWidget;

  //本地图片为空
  if(localImageUrl.isEmpty){
    //服务器地址为空
    if(serverImageUrl.isEmpty){
      //显示默认图片
      childWidget = _getDefaultAssetWidget(defaultImageUrl, width, height);
    } else {
      //显示网络图片
      serverImageUrl = CommonUtils.BASE_URL_UPLOAD + serverImageUrl;
      childWidget = _getCachedNetworkImage(serverImageUrl, defaultImageUrl, width, height);
    }
  } else {
    //本地图片不为空，判断是否存在
    File file = File(localImageUrl);
    bool isExist = file.existsSync();
    if(isExist){
      //如果本地文件存在，在本地显示
      childWidget = _getFileImageWidget(localImageUrl, width, height);
    } else {
      //网络现实图片，要加载服务器地址
      serverImageUrl = CommonUtils.BASE_URL_UPLOAD + serverImageUrl;
      childWidget = _getCachedNetworkImage(serverImageUrl, defaultImageUrl, width, height);
    }
  }

  return ClipRRect(
      borderRadius: BorderRadius.circular(angle),
      child: childWidget
  );
}

//刷新多媒体(图片、语音、小视频) (先刷新本地，然后小视频压缩完成再慢慢发送)
void _refreshMedia(int type, String mediaURL, String thumbnailFileName, {int mediaSecond=0, String messageId = "" }) async {

  bool isNetwork = await CommonNetwork.isNetwork();
  if(!isNetwork) {
    CommonUtils.showNetworkError(context);
    return;
  }

  String addTime = WnDateUtils.getCurrentTime();

  //先刷新本地聊天
  //ChatBean chatBean = ChatBean(fromAccount: widget.account, toAccount: widget.toGroupId,addTime:addTime,messageId: messageId,isRead: 1);
  GroupChatBean groupChatBean = GroupChatBean(account: widget.account, groupId: widget.toGroupId, addTime: addTime, messageId: messageId);
  LogUtils.d("群聊刷新：${type}");
  groupChatBean.contentType = type;
  groupChatBean.localMediaUrl = mediaURL;
  groupChatBean.content = thumbnailFileName;
  groupChatBean.second = mediaSecond;
  if(type == CommonUtils.CHAT_CONTENT_TYPE_IMG){
    //状态变更，向聊天记录中插入新记录
    setState(() {
      items.add(groupChatBean);
    });
    await GroupChatRepository.getInstance().insertGroupChat(groupChatBean);
  } 

  jumpToBottom(100);
}

//发送多媒体(图片、语音、小视频)
void _sendMedia(int type, String mediaURL, {int mediaSecond = 0, String messageId = ""}) async {

  bool isNetwork = await CommonNetwork.isNetwork();
  if(!isNetwork) {
    return;
  }

  //上传文件
  GroupChatBean? serverChatBean;
  String message = "";
  String addTime = WnDateUtils.getCurrentTime();
  ChatSendBean chatSendBean = ChatSendBean();
  chatSendBean.fromAccount = SpUtils.getAccount();
  chatSendBean.contentType = type;
  chatSendBean.messageId = messageId;
  chatSendBean.addTime = addTime;
  if(type == CommonUtils.CHAT_CONTENT_TYPE_IMG){
    //图片
    serverChatBean = await UploadUtils.getInstance().uploadGroupChatImage(widget.account, widget.toGroupId, mediaURL, messageId, addTime);

  }
  chatSendBean.content = serverChatBean?.serverMediaUrl??"";
  GroupChatRepository.getInstance().updateGroupChatByMessageId(serverChatBean?.messageId??"", serverChatBean?.serverMediaUrl??"");
  message = jsonEncode(chatSendBean);
  _sendMessage(message);
}