Android conversation.removeMessage(message.getMsgId()) 删除单聊有时候成功有时候不成功

EMConversation conversation= EMClient.getInstance().chatManager().getConversation(toChatUsername);
 conversation.removeMessage(message.getMsgId());
 conversation.getAllMessages();
 chatFragment.messageList.refresh();
 Log.e("onResult", "" + conversation.getAllMessages()); 
 Log.e("onResult", "" + conversation.getAllMsgCount()); 
 List emMessages = conversation.getAllMessages(); 
 for (int i = 0; i < emMessages.size(); i++) 
 { Log.e("onResult", "" + emMessages.get(i).toString()); }
删除单聊有时候有效有时候又没用 重新登入app就显示删除了，getAllMsgCount()的数量是对的