Android Socket Object Cause the App to Stop

public class ServerClient extends Activity {
	private Button bt;
	   private TextView tv;
	   private static final int REDIRECTED_SERVERPORT = 5000;
	   private String serverIpAddress = "10.0.2.2";
	   @Override
	   public void onCreate(Bundle savedInstanceState) {
	      super.onCreate(savedInstanceState);
	      setContentView(R.layout.main);
	      bt = (Button) findViewById(R.id.myButton);
	      tv = (TextView) findViewById(R.id.myTextView);


	      bt.setOnClickListener(new OnClickListener() {
	    	   Socket socket;
	      
	         public void onClick(View v) {
	        	
	   	      try {
	   	         InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
	   	         socket = new Socket(serverAddr, REDIRECTED_SERVERPORT);
	   	       
	   	      } catch (UnknownHostException e1) {
	   	         e1.printStackTrace();
	   	      } catch (IOException e1) {
	   	         e1.printStackTrace();
	   	      }
	            try {
	               EditText et = (EditText) findViewById(R.id.EditText01);
	               String str = et.getText().toString();
	               PrintWriter out = new PrintWriter(new BufferedWriter(
	                     new OutputStreamWriter(socket.getOutputStream())),
	                     true);
	               out.println(str);
	               Log.d("Client", "Client sent message");

	            } catch (UnknownHostException e) {
	               tv.setText("Error1");
	               e.printStackTrace();
	            } catch (IOException e) {
	               tv.setText("Error2");
	               e.printStackTrace();
	            } catch (Exception e) {
	               tv.setText("Error3");
	               e.printStackTrace();
	            }
	         }
	      });
	   }
	}