两个Wifi设备之间的数据传输

Question

我已经在Google中搜索。我尝试了很多。在Android 2.2和sdk 8中，我如何在Android的List中使用SSID？通过使用SSID应该通过编程获得特定的WiFi启用设备属性。有了这个帮助，应该可以在Android中的两个启用Wifi的设备之间传输数据。任何人都可以帮我解决这个问题吗？

Answer 1

要在两个Android设备之间以有意义的方式发送数据，您可以使用TCP连接。为此，您需要使用其他设备正在侦听的IP地址和端口。

示例摘自here。

对于服务器端（监听方），你需要一个服务器套接字：

try { 
     Boolean end = false; 
     ServerSocket ss = new ServerSocket(12345); 
     while(!end){ 
       //Server is waiting for client here, if needed 
       Socket s = ss.accept(); 
       BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream())); 
       PrintWriter output = new PrintWriter(s.getOutputStream(),true); //Autoflush 
       String st = input.readLine(); 
       Log.d("Tcp Example", "From client: "+st); 
       output.println("Good bye and thanks for all the fish :)"); 
       s.close(); 
       if (STOPPING conditions){ end = true; } 
     } 
ss.close(); 


} catch (UnknownHostException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
} catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
} 

对于需要连接到服务器套接字的套接字客户端。请更换 “本地主机” 与远程Android设备的IP地址或主机名：

try { 
     Socket s = new Socket("localhost",12345); 

     //outgoing stream redirect to socket 
     OutputStream out = s.getOutputStream(); 

     PrintWriter output = new PrintWriter(out); 
     output.println("Hello Android!"); 
     BufferedReader input = new BufferedReader(new InputStreamReader(s.getInputStream())); 

     //read line(s) 
     String st = input.readLine(); 
     //. . . 
     //Close connection 
     s.close(); 


} catch (UnknownHostException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
} catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
} 

Answer 2

For data Transfer between 2 devices over the wifi can be done by using "TCP" protocol. Connection between Client and Server requires 3 things 

1) Using NSD Manager, Client device should get server/host IP Address. 
2) Send data to server using Socket. 
3) Client should send its IP Address to server/host for bi-directional communication. 

对于代码verfication看到这个link

For faster transmission of data over wifi can be done by using "WifiDirect" 
which is a "p2p" connection. so that this will transfer the data from 
one to other device without an Intermediate(Socket). For Example catch 

在谷歌开发这个环节wifip2p和P2P Connection with Wi-Fi

在Github上抓取样本WifiDirectFileTransfer