Exception em socket android

e.printStackTrace();

} catch (Throwable e) {
				e.printStackTrace();
			}

package com.example.clienteservidor2;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.ServerSocket;
import java.net.Socket;

import android.app.Activity;
import android.app.AlertDialog;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

	Button btcliente, btservidor, btconectar;
	EditText edip, edporta, edtextosaida, textoentrada;

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

	public void inicio() {

		btcliente = (Button) findViewById(R.id.btcliente);
		btservidor = (Button) findViewById(R.id.btservidor);

		btcliente.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				setContentView(R.layout.cliente);
				cliente();
			}
		});

		btservidor.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				setContentView(R.layout.servidor);
				try {
					servidor();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}

		});

	}

	private void cliente() {
		edip = (EditText) findViewById(R.id.edip);
		edporta = (EditText) findViewById(R.id.edporta);
		btconectar = (Button) findViewById(R.id.btconectar);

		btconectar.setOnClickListener(new View.OnClickListener() {

			@Override
			public void onClick(View v) {
				if (edip != null & edporta != null) {
					Socket socket = null;
					DataOutputStream dataOutPutStream = null;
					DataInputStream dataInPutStream = null;

					String ip = edip.getText().toString();
					int porta = Integer.parseInt(edporta.getText().toString());

					try {
						System.out.println("Passo aqui 1");
						socket = new Socket(ip, porta);
						System.out.println("passo aqui 2");
						AlertDialog.Builder dialogo = new AlertDialog.Builder(
								MainActivity.this);
						dialogo.setTitle("Conectado:");
						dialogo.setMessage("Coneção realizada com sucesso");
						dialogo.setNeutralButton("OK", null);
						dialogo.show();

						setContentView(R.layout.clientechat);

						textoentrada = (EditText) findViewById(R.id.textoentrada);
						edtextosaida = (EditText) findViewById(R.id.edtextosaida);

						dataOutPutStream = new DataOutputStream(socket.getOutputStream());
						dataInPutStream = new DataInputStream(socket.getInputStream());
						dataOutPutStream.writeUTF(edtextosaida.getText().toString());

						@SuppressWarnings("deprecation")
						String stringLida = dataInPutStream.readLine();
						textoentrada.setText(stringLida);

					} catch (Exception e) {
						AlertDialog.Builder dialogo = new AlertDialog.Builder(
								MainActivity.this);
						dialogo.setTitle("Erro:");
						dialogo.setMessage("Excepition Classe Main, Metodo opcao();2");
						dialogo.setNeutralButton("OK", null);
						dialogo.show();
						e.printStackTrace();
					} finally {

						try {
							if (socket != null) {
								socket.close();
							}

							if (dataOutPutStream != null) {
								dataOutPutStream.close();
							}

							if (dataInPutStream != null) {
								dataInPutStream.close();
							}
						} catch (Exception e) {
							e.printStackTrace();
						}

					}

				}

			}
		});

	}

	private void servidor() throws IOException {
		ServerSocket serverSocket = new ServerSocket(1234);
		Socket socket;
		
		while(true){
			socket = serverSocket.accept();
			DataOutputStream dataOutputStream = new DataOutputStream(socket.getOutputStream());
			DataInputStream dataInputStream = new DataInputStream(socket.getInputStream());
			
			dataOutputStream.writeBytes("Servidor: " + dataInputStream.readUTF());
			dataOutputStream.flush();
			
			AlertDialog.Builder dialogo = new AlertDialog.Builder(
					MainActivity.this);
			dialogo.setTitle("Mensagem");
			dialogo.setMessage("A mensagem foi enviada com sucesso!!!");
			dialogo.setNeutralButton("OK", null);
			dialogo.show();
			
			dataOutputStream.close();
			socket.close();
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.activity_main, menu);
		return true;
	}

}