SettingsFragment.java

package com.example.patrick.myapplication;

import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceFragment;
import android.preference.PreferenceManager;
import android.util.Log;


/**
 * Created by Patrizio Perna on 11/01/15.
 */
public class SettingsFragment extends PreferenceFragment{
    private SharedPreferences prefs;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Load the preferences from an XML resource
        addPreferencesFromResource(R.xml.settings);

    }

    @Override
    public void onStart() {
        super.onStart();
        prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
        SharedPreferences.OnSharedPreferenceChangeListener listener =
                new SharedPreferences.OnSharedPreferenceChangeListener() {
                    public void onSharedPreferenceChanged(SharedPreferences prefs, String key) {
                        // listener implementation
                    }
                };
        prefs.registerOnSharedPreferenceChangeListener(listener);

        String username = prefs.getString("edittext_username", "");
        Log.i("USERNAME--", username);
    }
}