Notes

import android.app.Activity;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.net.Socket;

public class MainActivity extends Activity
{
public Socket sd; //sender=sd
public BufferedReader buffRd; //br=buffRd
public PrintStream ps; //bw= ps

EditText et; //e=et
Button bttn; //b=bttn
TextView txtVw; //t=txtVw

int pn;
String ipAdd;

class SocketListener implements Runnable
{
String ring; //str=ring

public void run()
{
try
{
sd = new Socket (ipAdd, pn);
buffRd = new BufferedReader (new InputStreamReader(sd.getInputStream()));
try (PrintStream printStream = ps = new PrintStream(sd.getOutputStream())) {
}
ps.println("Connected");

while (true)
{
String s = buffRd.readLine ();
CharSequence cs = txtVw.getText ();
ring = cs + "rn" + s;

txtVw.post(new Runnable()
{
public void run()
{
txtVw.setText(ring);
}
}
);
}
}
catch (IOException e)
{
Log.e(getClass().getName(), e.getMessage());
}
}
}

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

txtVw = (TextView)findViewById(R.id.textView);
txtVw.setMovementMethod(new ScrollingMovementMethod());

et = (EditText) findViewById(R.id.editText);


pn = 4455;
ipAdd = "192.168.199.2"; // Change this to the IP address of your computer OR “10.0.2.2”(Gateway to 127.0.0.1 of host)



bttn = (Button)findViewById(R.id.button);
bttn.setOnClickListener(new View.OnClickListener()
{
public void onClick(View v)
{
new Thread()
{
public void run()
{
String s = et.getText().toString();
ps.println (s);
}
}.start();
}
});

Thread d = new Thread (new SocketListener ());
d.start();
}
}