Java tutorial
//package com.java2s; /* * Copyright (C) 2014 The Android Open Source Project * * 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. */ public class Main { private static final char LEAF_SEPARATOR = '|'; /** * Extracts unique musicID from the mediaID. mediaID is, by this sample's convention, a * concatenation of category (eg "by_genre"), categoryValue (eg "Classical") and unique * musicID. This is necessary so we know where the user selected the music from, when the music * exists in more than one music list, and thus we are able to correctly build the playing queue. * * @param mediaID that contains the musicID * @return musicID */ public static String extractMusicIDFromMediaID(String mediaID) { int pos = mediaID.indexOf(LEAF_SEPARATOR); if (pos >= 0) { return mediaID.substring(pos + 1); } return null; } }