How to get preference value in preference fragment

I want to show the preference value in the user settings screen. To do this, I need to get the values, in this case strings, in the preference snippet. In non fragments (actions) I get values, eg. final SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);

and get the string with String phonenumber = prefs.getString("preference_name", null);

, but in the preference fragment is getDefaultSharedPreferences

not applicable for the preference fragment.

Any idea how to solve this?

Here is my code snippet:

public class PreferencesFragment extends PreferenceFragment implements
    OnSharedPreferenceChangeListener {

TextView tvusername, tvphonenumber;     

@Override
   public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     addPreferencesFromResource(R.xml.preferences);
     getPreferenceScreen().getSharedPreferences()
            .registerOnSharedPreferenceChangeListener(this);

     final SharedPreferences prefs = PreferenceManager
            .getDefaultSharedPreferences(this);


    // entering preference phonenumber in text view
            String phonenumber = prefs.getString("phonenumber", null);
            ;
            tvphonenumber.setText(phonenumber);

    // entering preference username in text view
            String username = prefs.getString("username", null);
            ;
            tvusername.setText(username);

}