Java tutorial
//package com.java2s; /* * Copyright 2014 sonaive.com. 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; import android.text.TextUtils; public class Main { private static final String PREF_ACTIVE_ACCOUNT = "chosen_account"; private static final String PREFIX_PREF_ID = "id_"; public static void setAccountId(final Context context, final String accountName, final String id) { SharedPreferences sp = getSharedPreferences(context); sp.edit().putString(makeAccountSpecificPrefKey(accountName, PREFIX_PREF_ID), id).commit(); } private static SharedPreferences getSharedPreferences(final Context context) { return PreferenceManager.getDefaultSharedPreferences(context); } private static String makeAccountSpecificPrefKey(Context ctx, String prefix) { return hasActiveAccount(ctx) ? makeAccountSpecificPrefKey(getActiveAccountName(ctx), prefix) : null; } private static String makeAccountSpecificPrefKey(String accountName, String prefix) { return prefix + accountName; } public static boolean hasActiveAccount(final Context context) { return !TextUtils.isEmpty(getActiveAccountName(context)); } public static String getActiveAccountName(final Context context) { SharedPreferences sp = getSharedPreferences(context); return sp.getString(PREF_ACTIVE_ACCOUNT, null); } }