Clash Royale CLAN TAG#URR8PPP

Can't open Java Server Socket on Android

I'm trying to program a simple Android chat program. For testing I want to have the server and the client running on the same device. I'm currently stuck with the very first step of setting up the server part and I simply don't know what I'm doing wrong. (The server will late be run in an own thread)

public class MainActivity extends AppCompatActivity

@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

int port = 4444;

try
ServerSocket serverSocket = new ServerSocket(port);
Log.i("Info", "Server socket initiated on port" + port);

catch (IOException e)
Log.e("Error", "Could not listen on port " + port);





I tried lots of different ports but I still get the IO Error. I also tried to simply use new ServerSocket(0) to allocate a free port using the following code:

public class MainActivity extends AppCompatActivity

@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

ServerSocket serverSocket = null;

try
serverSocket = new ServerSocket(0);
Log.i("Info", "Server socket initiated on port" + serverSocket.getLocalPort());

catch (IOException e)
Log.e("Error", "Could not listen on port " + serverSocket.getLocalPort());





But this simply returs a port number of -1 which means the serversocket still isn't bound to anything.

get the IO Error

1 Answer
1

The answer was to add the permission in the manifest. Thx!

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