android - 为什么我作为客户端连接时客户端列表是空的？

Question

我正在使用 Android Wi-Fi Direct 服务发现。当连接信息可用时，如果形成了一个组，我会请求组信息。出于某种原因，当我作为客户端连接时，我可以从组中获取组所有者，但客户端列表是空的。当我以群组所有者身份连接时，我可以获得群组所有者和客户列表。当我到达聊天 fragment 时，我试图显示群组所有者和客户是谁。另一个问题是组所有者设备名称似乎是空白，但其余信息是正确的，例如地址(我删除了地址行)。我试过在几个不同的地方请求组信息，但作为客户端连接时，我永远无法获得客户端列表。当我收到 SERVICE_CONNECTED Intent 时，我切换到聊天 fragment 。

作为客户端连接:

I/wfd_: Wi-Fi P2P Connection Changed
I/wfd_: Connected to P2P network. Requesting connection info
I/wfd_: Connection info available
I/wfd_: WifiP2pInfo: 
I/wfd_: Group formed: true
        Is group owner: false
        Group owner address: /192.168.49.1
I/wfd_: Stopping service discovery
I/wfd_: Service discovery stopped
I/wfd_: Connected as client
I/wfd_: Requesting group info
I/wfd_CommReceiver: This device changed
I/wfd_ClientSocketHandler: Client socket thread running
I/wfd_ClientSocketHandler: Opening client socket
I/System.out: [CDS][DNS] getAllByNameImpl netId = 0
I/System.out: [socket][0] connection /192.168.49.1:4545;LocalPort=34789(5000)
I/System.out: [CDS]connect[/192.168.49.1:4545] tm:5
I/wfd_: Service discovery requests cleared
I/wfd_: Group info available
I/wfd_: WifiP2pGroup:
I/wfd_: Network name: DIRECT-Ig-BLU Clark 2
        Is group owner: false
        Group owner: 
        Device name: BLU Clark 2
        Status: Unavailable

        Client list is empty.
/System.out: [socket][/192.168.49.117:34789] connected
I/wfd_ClientSocketHandler: Client socket - true
I/wfd_ClientSocketHandler: Launching the I/O handler
I/wfd_CommReceiver: Service connected
I/wfd_CommReceiver: Switching to Chat fragment
I/wfd_: handleMessage() called

以群组所有者身份连接:

I/wfd_: Wi-Fi P2P Connection Changed
I/wfd_: Connected to P2P network. Requesting connection info
I/wfd_: Connection info available
I/wfd_: WifiP2pInfo: 
I/wfd_: Group formed: true
        Is group owner: true
        Group owner address: /192.168.49.1
I/wfd_: Stopping service discovery
I/wfd_: Service discovery stopped
I/wfd_: Connected as group owner
I/wfd_OwnerSocketHandler: Group owner server socket started
I/wfd_: Requesting group info
I/wfd_OwnerSocketHandler: Group owner server socket thread running
I/wfd_: Service discovery requests cleared
I/wfd_CommReceiver: This device changed
I/wfd_: Group info available
I/wfd_: WifiP2pGroup:
I/wfd_: Network name: DIRECT-XB-Brendan BLU
        Is group owner: true
        Group owner: 
        Device name: 
        Status: Unavailable

        Client: 
        Device name: BLU Clark 2
        Status: Connected
I/wfd_CommReceiver: Service connected
I/wfd_CommReceiver: Switching to Chat fragment
I/wfd_OwnerSocketHandler: Launching the I/O handler
I/wfd_: handleMessage() called

代码:

@Override
    public void onConnectionInfoAvailable(WifiP2pInfo wifiP2pInfo) {
        Log.i(TAG, "Connection info available");

        Log.i(TAG, "WifiP2pInfo: ");
        Log.i(TAG, p2pInfoToString(wifiP2pInfo));
        this.groupFormed = wifiP2pInfo.groupFormed;
        this.isGroupOwner = wifiP2pInfo.isGroupOwner;

        if (wifiP2pInfo.groupFormed) {
            stopServiceDiscovery();

            Thread handler;
            if (wifiP2pInfo.isGroupOwner) {
                Log.i(TAG, "Connected as group owner");
                try {
                    handler = new OwnerSocketHandler(this.getHandler());
                    handler.start();
                } catch (IOException e) {
                    Log.e(TAG, "Failed to create a server thread - " + e.getMessage());
                    return;
                }
            } else {
                Log.i(TAG, "Connected as client");
                handler = new ClientSocketHandler(this.getHandler(), wifiP2pInfo.groupOwnerAddress);
                handler.start();
            }

            Log.i(TAG, "Requesting group info");
            // Requests peer-to-peer group information
            wifiP2pManager.requestGroupInfo(channel, new WifiP2pManager.GroupInfoListener() {
                @Override
                public void onGroupInfoAvailable(WifiP2pGroup wifiP2pGroup) {
                    Log.i(TAG, "Group info available");
                    if (wifiP2pGroup != null) {
                        Log.i(TAG, "WifiP2pGroup:");
                        Log.i(TAG, p2pGroupToString(wifiP2pGroup));
                        WifiDirectHandler.this.wifiP2pGroup = wifiP2pGroup;
                    } else {
                        Log.w(TAG, "Group is null");
                    }
                    localBroadcastManager.sendBroadcast(new Intent(Action.SERVICE_CONNECTED));
                }
            });

        } else {
            Log.w(TAG, "Group not formed");
        }
        localBroadcastManager.sendBroadcast(new Intent(Action.DEVICE_CHANGED));
    }

Answer 1

根据一位 Wi-Fi Direct 贡献者的说法，组客户端看不到其他客户端的列表。群组所有者必须跟踪并通知群组客户。

https://groups.google.com/forum/#!topic/wi-fi-direct/Ox83PKa1ilw