Server/Client Android program doesn't work on real android device

Question

I'm making a Server/Client program that sends and receives data between them. The program is working perfectly on the emulator, but when testing it on a real android device through WIFI it can't connect to the server.

Server Side

ServerSocket serverSocket = new ServerSocket(44444);
Socket clientSocket = serverSocket.accept();

Client Side

Socket socket = new Socket("192.168.1.2", 44444);

The problem isn't in sending data, it's in the connection establishment. That Android phone doesn't see the server side !

Answer 1

You are using a constructor, which expects a string hostname . However, you are providing an internet address. You have to use another constructor , which accepts an address as a parameter.

Try the following code on the client side:

Socket socket = new Socket (InetAddress.getByName ("192.168.1.2"), 44444);

Answer 2

您确定服务器对智能手机可用吗？...您可以尝试将PC连接到WIFI并使用telnet ip端口并验证是否可以访问服务器。

Answer 3

the android devices can not detect the ad-hoc network of windows you have to first make your PC hotspot by doing this :

step 1: open CMD (admin privileged) and run following command netsh wlan hostednetwork mode=allow ssid=NAME key=PASSWORD

this will make wifi , a hotspot now run this to start wifi hotspot: netsh wlan start hostednetwork

and to stop hotspot run this command : netsh wlan stop hostednetwork

Answer 4

The problem is in your network. Please make sure that the real android device and the your server( 192.168.1.2 ) are in the same network.

If those are in the same network only then you can communicate with the server from yourclient