Java tutorial
//package com.java2s; //License from project: Apache License import android.content.Context; import android.content.SharedPreferences; import android.util.Log; public class Main { private static String facebookId; public static String getFacebookId(Context context) { if (facebookId != null) return facebookId; else { SharedPreferences prefs = context.getSharedPreferences("profilo", Context.MODE_PRIVATE); String id = prefs.getString("reg_id", ""); if (id.isEmpty()) { Log.e("HELPER_FACEBOOK", "id facebook not found."); return null; } else { facebookId = id; return facebookId; } } } }