Conflict between PreferenceFragment and onOptionsItemSelected

It seems that I have a conflict between PreferenceFragment and onOptionsItemSelected , I am trying to send several ListPreference variables from UsbSettingActivity to the MainActivity using Intents, the problem is that I only get the first data, using the SDK debug in this activity, it observed that only the first data is available. fact:

mconfigbaudrate = 9600

Here is my code

public class UsbSettingActivity extends AppCompatPreferenceActivity {

final String setBaudRate = "" ;
public static String mconfigbaudrate = "";
public static String mconfigdatabit = "";
public static String mconfigbitstop = "";
public static String mconfigparity = "";
public static String mconfigfontsize = "";
public static String mconfigconsolamode = "";
public static String mconfigfindelinea = "";
public static String mconfigenableeco = "";
public static String mconfigfilesave = "";

private static Preference.OnPreferenceChangeListener
        sBindPreferenceSummaryToValueListener = new Preference.OnPreferenceChangeListener() {
    @Override
    public boolean onPreferenceChange(Preference preference, Object value) {
        String stringValue = value.toString();

        if (preference instanceof ListPreference) {
            ListPreference listPreference = (ListPreference) preference;
            int index = listPreference.findIndexOfValue( stringValue );
            preference.setSummary(index >= 0 ? listPreference.getEntries()[index] : null );
        }else {
            preference.setSummary( stringValue );
        }
        return true;
    }
};

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getFragmentManager().beginTransaction().replace(android.R.id.content, new MyPreferenceFragment()).commit();
    setupActionBar();
}


private void setupActionBar() {
    ActionBar actionBar = getSupportActionBar();
    if (actionBar != null) {
         actionBar.setDisplayHomeAsUpEnabled( true );
    }
}

private static void bindPreferenceSummaryToValue(Preference preference) {

    preference.setOnPreferenceChangeListener( sBindPreferenceSummaryToValueListener );
    sBindPreferenceSummaryToValueListener.onPreferenceChange( preference,PreferenceManager
            .getDefaultSharedPreferences( preference.getContext() )
            .getString( preference.getKey(), "" ) );
}

public static class MyPreferenceFragment extends PreferenceFragment {
    @Override
    public void onCreate(final Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        addPreferencesFromResource(R.xml.pref_setup_com);

        setHasOptionsMenu( true );

        bindPreferenceSummaryToValue( findPreference( "config_baud_rate" ) );
        bindPreferenceSummaryToValue( findPreference( "config_data_bit" ) );
        bindPreferenceSummaryToValue( findPreference( "config_bit_stop" ) );
        bindPreferenceSummaryToValue( findPreference( "config_parity" ) );
        bindPreferenceSummaryToValue( findPreference( "config_flow_control" ) );
        bindPreferenceSummaryToValue( findPreference( "config_font_size" ) );
        bindPreferenceSummaryToValue( findPreference( "config_consola_mode" ) );
        bindPreferenceSummaryToValue( findPreference( "config_fin_delinea" ) );
        bindPreferenceSummaryToValue( findPreference( "config_filesave" ) );

        ListPreference SPconfigbaudrate2 = (ListPreference) findPreference("config_baud_rate");
        mconfigbaudrate = SPconfigbaudrate2.getValue();

        ListPreference SPconfigdatabit2 = (ListPreference) findPreference("config_data_bit");
        String mconfigdatabit = SPconfigdatabit2.getValue();

        ListPreference SPconfigbitstop2 = (ListPreference) findPreference("config_bit_stop");
        String mconfigbitstop = SPconfigbitstop2.getValue();

        ListPreference SPmconfigparity2 = (ListPreference) findPreference("config_parity");
        String mconfigparity = SPmconfigparity2.getValue();

        ListPreference SPconfigfontsize2 = (ListPreference) findPreference("config_font_size");
        String mconfigfontsize = SPconfigfontsize2.getValue();

        ListPreference SPconfigconsolamode2 = (ListPreference) findPreference("config_consola_mode");
        String mconfigconsolamode = SPconfigconsolamode2.getValue();

        ListPreference SPconfigfindelinea2 = (ListPreference) findPreference("config_fin_delinea");
        String mconfigfindelinea = SPconfigfindelinea2.getValue();

        TwoStatePreference SPconfigenableeco2 = (TwoStatePreference) findPreference("config_enable_eco");
        Boolean mconfigenableecoX = SPconfigenableeco2.isChecked();
        String mconfigenableeco = String.valueOf(mconfigenableecoX);

        ListPreference SPconfigfilesave2 = (ListPreference) findPreference("config_filesave");
        String mconfigfilesave = SPconfigfilesave2.getValue();
    }
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    int id = item.getItemId();
    if (id == android.R.id.home) {
        Intent intent2 = new Intent(this, MainActivity.class);
        intent2.putExtra("mconfigbaudratex",mconfigbaudrate);
        intent2.putExtra("mconfigdatabitx",mconfigdatabit);
        intent2.putExtra("mconfigbitstopx", mconfigbitstop);
        intent2.putExtra("mconfigparityx", mconfigparity);
        intent2.putExtra("mconfigfontsizex", mconfigfontsize);
        intent2.putExtra("mconfigconsolamodex", mconfigconsolamode);
        intent2.putExtra("mconfigfindelineax", mconfigfindelinea);
        intent2.putExtra("mconfigenableecox", mconfigenableeco);
        intent2.putExtra("mconfigfilesavex", mconfigfilesave);

        startActivityForResult(intent2, 0);
    }
    return super.onOptionsItemSelected( item );
   }
 }

Could someone tell me what my error is? The data in listPreference is loaded and displayed correctly, if I replace the other variables except the first one with a text string, they all arrive correctly