Java tutorial
//package com.java2s; import java.util.Calendar; import android.content.Context; import android.content.SharedPreferences; import android.preference.PreferenceManager; public class Main { public static Calendar getWallpaperDate(Context context) { Calendar wallpaperDate = Calendar.getInstance(); SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(context); String dateTimeToString = preferences.getString("wallpaper_date", null); if (dateTimeToString == null) return wallpaperDate; wallpaperDate.set(Calendar.YEAR, Integer.parseInt(dateTimeToString.split("/")[0])); wallpaperDate.set(Calendar.MONTH, Integer.parseInt(dateTimeToString.split("/")[1])); wallpaperDate.set(Calendar.DATE, Integer.parseInt(dateTimeToString.split("/")[2])); return wallpaperDate; } }