Java tutorial
//package com.java2s; import android.content.Context; import android.content.SharedPreferences; import android.preference.PreferenceManager; public class Main { private static final String PREF_ID = "_id"; public static String getUserId(final Context context) { SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context); return sp.getString(PREF_ID, null); } }