public class LogIn extends Activity implements View.OnClickListener{

private Socket socket;
private DataOutputStream out;
private DataInputStream in;

private String username,password,s;

EditText eT_username,eT_password;
Button b_login,b_signup,b_connect;
TextView t;

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

    eT_username = (EditText)findViewById(R.id.eT_username);
    eT_password = (EditText)findViewById(R.id.eT_password);

    b_login = (Button)findViewById(R.id.b_login);
    b_signup = (Button)findViewById(R.id.b_signup);
    b_connect = (Button)findViewById(R.id.b_connect);

    t = (TextView)findViewById(R.id.tV);

    b_login.setOnClickListener(this);
}

@Override
public void onClick(View v) {
    String toast_msg;
    try {
        out = new DataOutputStream(socket.getOutputStream());
        in = new DataInputStream(socket.getInputStream());

        out.writeUTF("1");

        username = eT_username.getText().toString();
        password = eT_password.getText().toString();

        out.writeUTF(username);
        //        out.flush();
        out.writeUTF(password);
        //        out.flush();

        t.setText("hi");

        s = in.readUTF();


        if (s.equals("ok")) {
            toast_msg = "Login is successfull";
            t.setText(toast_msg);
        } else {
            toast_msg = "username or password is incorrect";
            t.setText(toast_msg);
        }

    } catch (IOException e) {
        t.setText(e.toString());
    }
}



public void connect(View v)
{
    new Thread(new Runnable() {
        @Override
        public void run() {
            try
            {
                socket = new Socket("192.168.0.101",5000);

            }
            catch(Exception e)
            {
                TextView t = (TextView)findViewById(R.id.textView);
                t.setText(e.toString());
                //   Toast.makeText(LogIn.this,"Make sure that you are connected to Internet",Toast.LENGTH_LONG).show();
            }
        }
    }).start();
}
public void openSignUp(View v)
{
    if (v.getId()== R.id.b_signup)
    {
        Intent i =  new Intent(LogIn.this,SignUp.class);
        startActivity(i);
    }
    new SignUp(socket);
}