1. Hello Socket Programming TCP and UDP
Android Introduction
Hello Socket Programming
TCP and UDP

2. Goal Convert the Java Socket Programming Project to Android
Text input from the user – sent to the same server(s) as before
Answer from the server(s)
Sends the input from the user to the UPD Server
Sends the input from the user to the TCP Server

3. Layout Create a simple layout that will include the required elements:
EditText
TextView
Buttons
Register one “OnClickedListener()” for each of the buttons
Test functionality (make a toast for each listener)

4. Socket Programming
Define most variables as members of the main Activity Class
Rename:
DatagramSocket clientSocket -> DatagramSocket udpClientSocket
Socket clientSocket -> Socket tcpSocket;
Adapt the code from pure Java to Android (especially the input and output strings) by filling in the two OnClickListeners

5. Handling Exceptions
Many network operations throw exceptions (as they can fail). In the original code they were just thrown out of main – in Android we have to handle them!
Try{
Operations that may fail and throw an exception;
}catch (Exception e) {
Log.e(TAG,"Caught UDP Exception: “ + e.getMessage());
Toast.makeText(HelloNets.this, "UDP Error"+ e.getMessage()), Toast.LENGTH_LONG).show(); }

6. Running it
First give the application INTERNET permissions (like in the WebView)
Implement the UDP and TCP functionality separately
Run and debug.