How to exchange messages via bluetooth in android application?

Question

Android

Hey!

I'm making an android app that needs to exchange messages with another (existing) bluetooth app (I've never done this before). Based on examples from the Internet, the code turned out:

while (socket == null) {
  try {
    serverSocket = BluetoothAdapter.getDefaultAdapter().listenUsingRfcommWithServiceRecord(
      APP_NAME, UUID.fromString(UUID_STR)
    );
    socket = serverSocket.accept();
  } catch (IOException ex) {
    ex.printStackTrace();
  }
}

which stops at line c acceptand throws an exception from time to time.
Can this be fixed?