Java tutorial
//package com.java2s; import android.content.Context; import android.content.SharedPreferences; public class Main { public final static int THEME_SUN = 1; public final static int THEME_NIGHT = 2; public static int getSwitchDayNightMode(Context context) { int mode = getDayNightMode(context); return mode == THEME_SUN ? THEME_NIGHT : THEME_SUN; } public static int getDayNightMode(Context context) { SharedPreferences sharedPreferences = getSharedPreferences(context); return sharedPreferences.getInt("SUN_NIGHT_MODE", THEME_SUN); } private static SharedPreferences getSharedPreferences(Context context) { return context.getSharedPreferences("NightModeDemo", Context.MODE_APPEND); } }