recallMessage static method

Future<RecallNotificationMessage?> recallMessage(Message? message, String? pushContent)

撤回消息

当接收方离线并允许远程推送时，会收到远程推送。 远程推送中包含两部分内容，一是pushContent，用于显示；二是pushData，用于携带不显示的数据。

SDK内置的消息类型，如果您将pushContent和pushData置为空或者为null，会使用默认的推送格式进行远程推送。 自定义类型的消息，需要您自己设置pushContent和pushData来定义推送内容，否则将不会进行远程推送。

Implementation

static Future<RecallNotificationMessage?> recallMessage(Message? message, String? pushContent) async {
  if (message == null) {
    developer.log("send message fail: conversationType or targetId or content is null", name: "RongIMClient");
    return null;
  }
  if (pushContent == null) {
    pushContent = "";
  }
  Map msgMap = MessageFactory.instance!.message2Map(message);
  Map map = {"message": msgMap, "pushContent": pushContent};
  Map? resultMap = await _channel.invokeMethod(RCMethodKey.RecallMessage, map);
  if (resultMap == null) {
    return null;
  }
  String? messageString = resultMap["recallNotificationMessage"];
  if (messageString == null || messageString.isEmpty) {
    developer.log("send message fail: conversationType or targetId or content is null", name: "RongIMClient");
    return null;
  }
  RecallNotificationMessage? msg = MessageFactory.instance!.string2MessageContent(messageString, RecallNotificationMessage.objectName) as RecallNotificationMessage?;
  return msg;
}