String username = et.getText().toString();
    String password = et1.getText().toString();
    String email = et2.getText().toString();

    String emailpatern = "^[_A-Za-z0-9-\+]+(\.[_A-Za-z0-9-]+)*@"
            + "[A-Za-z0-9-]+(\.[A-Za-z0-9]+)*(\.[A-Za-z]{2,})$";
    if (username.equals("")) {
        et.setError("pls enter name");
    } else if (password.equals("")) {
        et1.setError("pls enter last name");
    } else if (email.equals("")) {
        et2.setError("Pls Enter Valid Email");
    } else if (!email.matches(emailpatern)) {
        et2.setError("Pls Enter Valid email charcters");
    }
    BackgroundTask backgroundTask = new BackgroundTask();
    backgroundTask.execute(username,password,email);

}
class BackgroundTask extends AsyncTask<String,Void,String>
{
    String reg_url;
    @Override
    protected void onPreExecute() {
        reg_url ="http://iwt.devxenorix.com/webservices/create-user.php";
    }

    @Override
    protected String doInBackground(String... args)
    {
        String username,password,email;
        username = args[0];
        password = args[1];
        email = args[2];
        try {
            URL ur = new URL(reg_url);
            HttpURLConnection httpURLConnection = (HttpURLConnection) ur.openConnection();
            OutputStream outputStream = httpURLConnection.getOutputStream();
            httpURLConnection.setRequestMethod("POST");
            httpURLConnection.setDoOutput(true);
            BufferedWriter bufferedWriter  = new BufferedWriter(new OutputStreamWriter(outputStream,"UTF-8"));
            String register = URLEncoder.encode("username","UTF-8")+"="+URLEncoder.encode(username,"UTF-8")+"&"+
                    URLEncoder.encode("password","UTF-8")+"="+URLEncoder.encode(password,"UTF-8")+"&"+
                    URLEncoder.encode("email","UTF-8")+"="+URLEncoder.encode(email,"UTF-8");
            bufferedWriter.write(register);
            bufferedWriter.flush();
            bufferedWriter.close();
            outputStream.close();
            InputStream inputStream = httpURLConnection.getInputStream();
            inputStream.close();
            httpURLConnection.disconnect();
            return "Registered...";
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return "register failure";
    }

    @Override
    protected void onProgressUpdate(Void... values) {
        super.onProgressUpdate(values);
    }

    @Override
    protected void onPostExecute(String result) {
        Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();
    }
}
}