Android RealTimeMultiplayer.sendReliableMessage消息接收顺序错误

我正在使用Games.RealTimeMultiplayer.sendReliableMessage在Android上发送消息，但它们似乎出现了故障。各国：

可靠的消息传递。通过可靠的消息传递，可以保证数据传递、完整性和顺序

我将一个大数据包分解为多个1400字节的消息，并使用sendReliableMessage发送每个消息，这是在一个循环中完成的。在该循环之后，我使用sendReliableMessage发送另一条消息，但在接收设备上，最后一条消息在其他一些消息之前通过。发送数据包的代码为：

public void sendPacket(Packet packet)
{
    try {

        Log.d(getPackageName(), "Sending packet: " + packet.getClass().getSimpleName());

        ByteArrayOutputStream byteOutpuStream = new ByteArrayOutputStream();
        ObjectOutputStream outputStream = new ObjectOutputStream(byteOutpuStream);
        outputStream.writeObject(packet);
        byte[] bytes = byteOutpuStream.toByteArray();
        outputStream.close();

        if(m_Participants != null) {
            for (Participant participant : m_Participants) {
                if (participant.getParticipantId().equals(m_LocalParticipantID) == false) {

                    Log.d(getPackageName(), "Sending object size " + bytes.length + " to participant " + participant.getParticipantId());
                    byte[] objectSize = ByteBuffer.allocate(4).putInt(bytes.length).array();
                    int sendResult = Games.RealTimeMultiplayer.sendReliableMessage(m_GoogleClient, this, objectSize, m_RoomID, participant.getParticipantId());
                    Log.d(getPackageName(), "Send object size result: " + sendResult);

                    Log.d(getPackageName(), "Sending packet to " + participant.getParticipantId());
                    int bytesRemaining = bytes.length;
                    if(bytesRemaining <= Multiplayer.MAX_RELIABLE_MESSAGE_LEN)
                    {
                        Log.d(getPackageName(), "Sending full packet " + bytesRemaining + " bytes");
                        sendResult = Games.RealTimeMultiplayer.sendReliableMessage(m_GoogleClient, this, bytes, m_RoomID, participant.getParticipantId());
                        Log.d(getPackageName(), "Send packet result: " + sendResult);
                    }
                    else
                    {
                        int sentAmount = 0;
                        byte[] bufferToSend = new byte[Multiplayer.MAX_RELIABLE_MESSAGE_LEN];
                        while(bytesRemaining > 0) {
                            int byteCountSent = 0;
                            if(bytesRemaining >= Multiplayer.MAX_RELIABLE_MESSAGE_LEN)
                            {
                                byteCountSent = Multiplayer.MAX_RELIABLE_MESSAGE_LEN;
                                for(int byteIndex = 0; byteIndex < byteCountSent; ++byteIndex)
                                {
                                    bufferToSend[byteIndex] = bytes[sentAmount + byteIndex];
                                }
                            }
                            else
                            {
                                byteCountSent = bytesRemaining;
                                bufferToSend = Arrays.copyOfRange(bytes, sentAmount, sentAmount + bytesRemaining);
                            }
                            Log.d(getPackageName(), "Sending " + bufferToSend.length + " bytes");
                            sendResult = Games.RealTimeMultiplayer.sendReliableMessage(m_GoogleClient, this, bufferToSend, m_RoomID, participant.getParticipantId());
                            Log.d(getPackageName(), "Send packet result: " + sendResult);

                            bytesRemaining -= byteCountSent;
                            sentAmount += byteCountSent;
                        }
                    }
                }
            }
        }
    }
    catch(Exception e)
    {
        e.printStackTrace();
    }

接收函数是，它获取4字节的数据包大小，然后在消息传入时重新组装数据包，如下所示：

First call to sendPacket:

Sending object size 62234 to participant p_CImSt4aNy73IiQEQAQ
Send object size result: 1

Sending packet to p_CImSt4aNy73IiQEQAQ
Sending 1400 bytes
Send packet result: 2
Sending 1400 bytes
Send packet result: 3
Sending 1400 bytes
...
Send packet result: 44
Sending 1400 bytes
Send packet result: 45
Sending 634 bytes
Send packet result: 46

Next call to sendPacket:

Sending packet: StartGamePacket
Sending object size 267 to participant p_CImSt4aNy73IiQEQAQ
Send object size result: 47

Sending packet to p_CImSt4aNy73IiQEQAQ
Sending full packet 267 bytes
Send packet result: 48

@Override
public void onRealTimeMessageReceived(RealTimeMessage realTimeMessage)
{
    try {

        byte[] data = realTimeMessage.getMessageData();
        Log.d(getPackageName(), "onRealTimeMessageReceived: " + data.length + " bytes");

        // Are we expecting a packet?
        if(m_CurrentPacketData == null)
        {
            // Get the packet size
            if(data.length != 4)
            {
                Log.d(getPackageName(), "Error! 4 bytes expected for packet size, got " + data.length);
            }
            else
            {
                int packetSize = ByteBuffer.wrap(data).getInt();
                m_CurrentPacketData = new byte[packetSize];
                m_CurrentPacketReceiveCount = 0;
            }
        }
        else
        {
            // Append the data to the packet
            Log.d(getPackageName(), "Received data of " + data.length + " bytes");
            for(int byteIndex = 0; byteIndex < data.length; ++byteIndex)
            {
                m_CurrentPacketData[m_CurrentPacketReceiveCount + byteIndex] = data[byteIndex];
            }
            m_CurrentPacketReceiveCount += data.length;

            // Have we received it all?
            if(m_CurrentPacketReceiveCount == m_CurrentPacketData.length)
            {
                Log.d(getPackageName(), "Full packet received");

                ByteArrayInputStream byteInputStream = new ByteArrayInputStream(m_CurrentPacketData);
                ObjectInputStream inputStream = new ObjectInputStream(byteInputStream);
                Packet packet = (Packet) inputStream.readObject();
                inputStream.close();
                m_ReceivedPackets.add(packet);

                Log.d(getPackageName(), "Packet received: " + packet.getClass().getSimpleName());

                m_CurrentPacketData = null;
                m_CurrentPacketReceiveCount = 0;

                processReceivedPackets();
            }
            else
            {
                Log.d(getPackageName(), "Still " + (m_CurrentPacketData.length - m_CurrentPacketReceiveCount) + " bytes remaining");
            }
        }
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

---

正如您在接近尾声时所看到的，数据包的顺序出现了问题。安卓上的实时多人游戏还有其他人遇到过这样的问题吗？

你解决了这个问题吗？

---

看来实施并不能保证秩序。因此，您可能要做的是检查此消息id的重新回调结果（

onRealTimeMessageSent

）（称为令牌并由

sendReliableMessage

重新调谐），并且只有当结果正常时，才发送下一个数据包。

我最终更改了数据包结构，在报头中包含一个id，该id随着每个数据包的增加而增加，这样，接收方就可以跟踪数据包的顺序，并对无序到达的数据包重新排序。这比等待每个数据包的确认要快一点。我想你是对的，要么是实现中存在缺陷，要么是文档不正确。同样的问题也发生在我身上，经过一些测试，我得出结论，

sendReliableMessage

不能保证数据包以相同的顺序传递。我刚刚决定等待

onRealTimeMessageSent

回调，以在发件人端强制执行排序。您能否与您的解决方案共享一个示例？（即，“最终改变数据包结构，在报头中包含一个ID，该ID随着每个数据包的增加而增加，以便接收方能够跟踪数据包的顺序，并对无序到达的数据包重新排序。”）

onRealTimeMessageReceived: 4 bytes
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 60834 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 59434 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 58034 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 56634 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 55234 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 53834 bytes remaining
...
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 17434 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 16034 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 14634 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 13234 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 11834 bytes remaining
onRealTimeMessageReceived: 634 bytes
Received data of 634 bytes
Still 11200 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 9800 bytes remaining
onRealTimeMessageReceived: 4 bytes
Received data of 4 bytes
Still 9796 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 8396 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 6996 bytes remaining
onRealTimeMessageReceived: 267 bytes
Received data of 267 bytes
Still 6729 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 5329 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 3929 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 2529 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes
Still 1129 bytes remaining
onRealTimeMessageReceived: 1400 bytes
Received data of 1400 bytes