Question

我正在使用Wi-Fi direct开发Android多人游戏。使用Wi-Fi直接，我能够在对等设备之间建立连接。此外，代码能够将数据从客户端设备发送到服务器设备。（根据Android文档，Wi-Fi直接使用客户端 - 服务器模型）

问题：

我无法使用Wi-Fi直接从服务器设备与客户端设备共享数据。

我有以下问题：

还有其他方法可以在两者之间传输数据(bi-directional) 通过Wi-Fi Direct连接的Android设备？
在我的在线研究期间，我理解从服务器发送数据设备到客户端设备，服务器需要知道客户端的IP 地址。如何使用此客户端的IP地址从中发送数据服务器设备到客户端设备？（我能够获取客户端的IP 地址）

我很感激有关这些查询的任何建议。提前谢谢。

代码：服务器端

    public  class DataTransferAsyncTask extends AsyncTask<Void,Void,String>{
    ServerSocket serverSocket;

    Socket client;
    InputStream inputstream;
    Context context = mActivity.getApplicationContext();
    String s;
    InetAddress client_add;

    @Override
    protected String doInBackground(Void... voids) {

        try{

             serverSocket = new ServerSocket(9999);
            Log.e("hello", "Server: Socket opened");
            client = serverSocket.accept();
            Log.e("hello", "Server: connection done");

            inputstream = client.getInputStream();
        //  OutputStream outputStream = serverSocket.getO

            //getting data from client
            byte[] address = new byte[12];
            if(client.isConnected())
            inputstream.read(address);

             s = new String(address);
            String only_add = new String();
            only_add = s.substring(0,12);

             client_add = InetAddress.getByName(only_add);

            Log.e("hello", "Server: clients ip 1 " + only_add);
            Log.e("hello", "Server: converted address 1 " + client_add + " \n is connected"+
                    client.isConnected());




            //send data to client

            OutputStream stream = client.getOutputStream();

             stream.write(s.getBytes());
            Log.e("hello","context value "+context);




        //  cancel(true);



        }catch (IOException e){

        }
        return null;
    }

}

客户端：

@override
protected void onHandleIntent(Intent intent) {
    Log.e("hello","client socket");
    Toast.makeText(this,"client socket",Toast.LENGTH_LONG).show();
    Context context = getApplicationContext();
    if(intent.getAction().equals(action_send_data)){
        String host = intent.getStringExtra(group_owner_address);
        Socket socket = new Socket();
        int port = intent.getIntExtra(group_owner_port,9999);


        //binding connection
        try{

            String x="hello";
            Log.e("hello","opening client socket");
            byte[] address = getLocalAddress();
            String ipAdd = getDottedDecimalIP(address);

            socket.bind(null);
            socket.connect(new InetSocketAddress(host,port),socket_timeout);

            Log.e("hello","device socket address "+ socket.getInetAddress() );



            Log.e("hello","client socket is connected"+socket.isConnected());
            Log.e("hello","device address  :"+ipAdd + "  byte "+ address);

            //sending data to server
            OutputStream stream = socket.getOutputStream();

            stream.write(ipAdd.getBytes());


            //getting data from the server(supposed to)

            InputStream inputstream = socket.getInputStream();

            byte[] address_to_sto_fr_ser = new byte[15] ;
            inputstream.read(address_to_sto_fr_ser);

            String s = new String(address_to_sto_fr_ser);
            Log.e("msg from server","msg from server "+s);



          //  stream.close();
          //  is.close();


        }catch (IOException e){

        }
    }

}

Answer 1

客户端与WiFi Direct Group Owner之间的通信基于在Group Owner上运行的Socket服务器和连接到该服务器的客户端。

一旦形成WiFi Direct组（您可以通过检查＆＃34; onConnectionInfoAvailable(WifiP2pInfo wifiP2pInfo)＆＃34;）知道，检查当前设备是否为组所有者，如果是，则启动套接字服务器（类似到你的代码）：

mServerSocket = new ServerSocket(mPort);
Log.e(getClass().getSimpleName(), "Running on port: " + mServerSocket.getLocalPort());

接下来，添加此行以接受连接并存储客户端套接字的引用：

Socket mSocket = mServerSocket.accept();

现在，您有一个客户端套接字的引用，您可以使用它来向它发送数据/消息。接下来，其他设备（客户端）应该启动与套接字服务器的连接：

mSocket = new Socket();
mSocket.bind(null);
mSocket.connect(new InetSocketAddress(mAddress, mPort), 500);

从服务器向客户端发送消息：

DataOutputStream mDataOutputStream = new DataOutputStream(mSocket.getOutputStream());

发送简单信息：

mDataOutputStream.writeUTF(message);
mDataOutputStream.flush();

希望这有帮助。

使用Wi-Fi直接进行点对点数据共享

1 个答案: