public boolean onNavigationItemSelected(MenuItem item) {

        Fragment selectedFragment = null;

        switch (item.getItemId())
        {
            case R.id.nav_blog:
                selectedFragment = BlogFragment.newInstance();
                break;
            case R.id.nav_moniter:
                selectedFragment = RealTimeFragment.newInstance();
                break;
            case R.id.nav_lock:
                selectedFragment = LockFragment.newInstance();

                break;
            case R.id.nav_logs:
                selectedFragment = LogsFragment.newInstance();
                break;

            case R.id.nav_share:
                selectedFragment = ShareFragment.newInstance();
                break;
        }

        FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
        transaction.replace(R.id.MainLayout, selectedFragment);
        transaction.commit();

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);

        return true;
    }
}