系统消息对象返回js为[null]

[dogbutcat]

Environment

package: jmessage-react-plugin@2.3.9
platform: android

Description

在控制台新建群组并添加成员后，调用拉取历史消息APIJMessage.getHistoryMessages时，返回数据体Message为[null]，实际上应是eventType为group_member_added的object，查看源码发现在如下case中

jmessage-react-plugin/android/src/io/jchat/android/utils/ResultUtils.java

Lines 201 to 224 in c7e9843

	case eventNotification:
	result.putString(Constant.TYPE, "event");
	List usernameList = ((EventNotificationContent) content).getUserNames();
	result.putArray(Constant.USERNAMES, toJSArray(usernameList));
	switch (((EventNotificationContent) content).getEventNotificationType()) {
	case group_member_added:
	//群成员加群事件
	result.putString(Constant.EVENT_TYPE, "group_member_added");
	break;
	case group_member_removed:
	//群成员被踢事件
	result.putString(Constant.EVENT_TYPE, "group_member_removed");
	break;
	case group_member_exit:
	//群成员退群事件
	result.putString(Constant.EVENT_TYPE, "group_member_exit");
	break;
	case group_info_updated:
	result.putString(Constant.EVENT_TYPE, "group_info_updated");
	break;
	}
	default:
	return null;
	}

执行之后并没有break，结果直接跳转default并且返回了null而非result，导致js获取数据为[null]出错。不知是否为bug

Expectation

系统消息正常返回

[dogbutcat]

FIX with PR #72

[JoshLipan]

Thank you for your PR and help us a lot.