没有收到带有 smack 的离线消息

Question

我正在尝试使用 openfire、smack 和 android 的聊天应用程序，其中离线消息不起作用。如果两个用户都在线，则能够正确发送和接收消息。但是，如果用户 A 离线并且用户 B 发送消息，则用户 A 一旦在线就不会收到 B 发送的消息。尝试了来自 stackoverflow 的可能解决方案，但都没有工作。使用以下代码检索离线消息。

新线程（）{ 公共无效运行（）{

            XMPPTCPConnectionConfiguration config = XMPPTCPConnectionConfiguration.builder()

                    .setSocketFactory(SocketFactory.getDefault())

                    .setSecurityMode(ConnectionConfiguration.SecurityMode.disabled)

                    .setServiceName("123.456.0.854")//service name

                    .setHost("123.456.0.854") // host name 

                    .setPort(5222) //port

                    .setUsernameAndPassword("phone", "admin")
                    .setConnectTimeout(40000)

                    .setCompressionEnabled(false).build();

            connection = new XMPPTCPConnection(config);

            try {
                connection.connect();
                connection.login("phone", "admin");
                Presence presence = new Presence(Presence.Type.available);
                presence.setStatus("Available");
                try {
                    connection.sendStanza(presence);
                } catch (SmackException.NotConnectedException e) {
                    e.printStackTrace();
                }
            } catch (SmackException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } catch (XMPPException e) {
                e.printStackTrace();
            }



            OfflineMessageManager offlineMessageManager = new OfflineMessageManager(connection);

            try {
                System.out.println("Count is " +offlineMessageManager.getMessageCount());
            } catch (SmackException.NoResponseException e) {
                e.printStackTrace();
            } catch (XMPPException.XMPPErrorException e) {
                e.printStackTrace();
            } catch (SmackException.NotConnectedException e) {
                e.printStackTrace();
            }

        }
    }.start(); 

Answer 1

经过一番挣扎，我已经解决了这个问题。在您的 openfire 管理页面中，转到“客户端设置”并将空闲时间从 360 秒（默认）减少到 1 秒（可能）。只有当您断开与 Internet 的连接时，它才能检测到您处于离线状态，并将其余消息保存为离线。

@Override public void onNetworkConnectionChanged(boolean isConnected) {

if(isConnected){
    new Thread() {

        public void run() {
            try {
                XMPPTCPConnectionConfiguration.Builder builder = XMPPTCPConnectionConfiguration.builder();
                builder.setSecurityMode(ConnectionConfiguration.SecurityMode.disabled);
                builder.setUsernameAndPassword("phone", "admin");
                builder.setSendPresence(true);
                builder.setServiceName(<Service name>);
                builder.setHost(<Host name>);
                builder.setResource("Test");
                builder.setDebuggerEnabled(true);
                Presence presence = new Presence(Presence.Type.available);
                presence.setStatus("Available");
                connection = new XMPPTCPConnection(builder.build());
                connection.connect();
                connection.login();
                Presence presence123 = new Presence(Presence.Type.available);
                presence123.setStatus("Available");
                try {
                    connection.sendStanza(presence123);
                } catch (SmackException.NotConnectedException e) {
                    e.printStackTrace();
                }
                StanzaFilter filter = new AndFilter(new StanzaTypeFilter(Message.class));
                PacketListener myListener = new PacketListener()
                {
                    public void processPacket(Stanza stanza)
                    {
                        retrieveMessage(stanza,userType);
                    }
                };
                connection.addPacketListener(myListener, filter);
                try {
                    connection.sendStanza(presence);
                } catch (SmackException.NotConnectedException e) {
                    e.printStackTrace();
                }

            } catch (SmackException | XMPPException | IOException e) {
                e.printStackTrace();
            }


            //return connection.isConnected();
        }

    }.start(); 

以上工作正常并且能够检索离线消息。方法“retrieveMessage(stanza,userType);”用于处理传入的消息并更新Adapter。确保在重新连接时将 Presence 发送为“可用”。如果还有问题，请告诉我。