Mainactivity

package com.example.awmobile;


import java.io.*;

import java.net.Socket;
import java.net.UnknownHostException;

import android.os.Bundle;
import android.os.Handler;
import android.os.StrictMode;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.view.Menu;
import android.os.AsyncTask;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;



@SuppressLint("NewApi") public class MainActivity extends Activity {
	Socket s;
	private boolean mRun = false;
	private Handler handler = new Handler();







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




        final TextView textView1 = (TextView)findViewById(R.id.textView1);


        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);




      //We creëren een reader die luistert naar de connectie (een inputstream).
        BufferedReader in;
        String ontvangenBericht;


				try {
					in = new BufferedReader(new InputStreamReader(s.getInputStream()));
					 //nu luisteren we net zo lang totdat we niks meer ontvangen (connectie is gesloten):
					StringBuilder ontvangenData = new StringBuilder();
			        while((ontvangenBericht = in.readLine()) != null) {   //de in.readLine levert een string op, deze string wordt geassigned aan de variabele ontvangenBericht daarna wordt gekeken of deze variabele de waarde null bevat.
						   //we hebben data ontvangen van de server.
						  textView1.setText(ontvangenBericht);
						   ontvangenBericht = null;

						}

				} catch (IOException e2) {
					// TODO Auto-generated catch block
					e2.printStackTrace();
				}














    Button button1 = (Button) findViewById(R.id.button1);
    Button button2 = (Button) findViewById(R.id.button2);
    Button button3 = (Button) findViewById(R.id.button3);
    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        	TextView t = (TextView)findViewById(R.id.textView1);

        	try {
        		s = new Socket("192.168.1.4",4444);
        		mRun = true;
        		} catch (UnknownHostException e) {
        	        // TODO Auto-generated catch block
        	        e.printStackTrace();
        	        t.setText(t.getText() + "\n" + "unknownhost");
        	} catch (IOException e) {
        	        // TODO Auto-generated catch block
        	        e.printStackTrace();

        	        t.setText(t.getText() + "\n" + e.toString());
        	}


        }
    });


    button2.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
        	 //outgoing stream redirect to socket

			try {
				OutputStream out = s.getOutputStream();
				PrintWriter output = new PrintWriter(out);
				output.println("Hello from Android");
				output.flush();
				output.close();



			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

        }});

    button3.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {

        }
        });

    }







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

}