Java tutorial
//package com.java2s; /* * Copyright (C) Stichting Akvo (Akvo Foundation) * * This file is part of Akvo Caddisfly. * * Akvo Caddisfly is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * Akvo Caddisfly is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Akvo Caddisfly. If not, see <http://www.gnu.org/licenses/>. */ import android.content.Context; import android.content.SharedPreferences; import android.preference.PreferenceManager; import android.support.annotation.StringRes; public class Main { private static final String KEY_FORMAT = "%s_%s"; /** * Gets a long value from preferences * * @param context the context * @param keyId the key id * @return the stored long value */ public static long getLong(Context context, String code, @StringRes int keyId) { String key = String.format(KEY_FORMAT, code, getKey(context, keyId)); return getLong(context, key); } /** * Gets a long value from preferences * * @param context the context * @param key the key id * @return the stored long value */ @SuppressWarnings("WeakerAccess") public static long getLong(Context context, String key) { SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context); return sharedPreferences.getLong(key, -1L); } /** * Gets a preference key from strings * * @param context the context * @param keyId the key id * @return the string key */ private static String getKey(Context context, @StringRes int keyId) { return context.getString(keyId); } /** * Gets a string value from preferences * * @param context the context * @param keyId the key id * @param defaultValue default value * @return the stored string value */ public static String getString(Context context, @StringRes int keyId, String defaultValue) { SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context); return sharedPreferences.getString(getKey(context, keyId), defaultValue); } /** * Gets a string value from preferences * * @param context the context * @param keyId the key id * @param defaultValue default value * @return the stored string value */ public static String getString(Context context, String keyId, String defaultValue) { SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context); return sharedPreferences.getString(keyId, defaultValue); } public static String getString(Context context, String code, @StringRes int keyId, String defaultValue) { String key = String.format(KEY_FORMAT, code, getKey(context, keyId)); return getString(context, key, defaultValue); } }