Java tutorial
//package com.java2s; /* * Copyright (C) 2014 Google Inc. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.content.Context; import android.content.SharedPreferences; import android.preference.PreferenceManager; public class Main { private static final String PREF_KEY_COUNTER = "counter"; /** * Saves the counter value in the preference storage. If <code>value</code> * is negative, then the value will be removed from the preferences. */ public static void saveCounterToPreference(Context context, int value) { SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(context); if (value < 0) { // we want to remove pref.edit().remove(PREF_KEY_COUNTER).apply(); } else { pref.edit().putInt(PREF_KEY_COUNTER, value).apply(); } } }