Java tutorial
/* * Copyright (c) 2014 eLedge.net and the original author or authors. * 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. */ package net.eledge.android.toolkit; import android.util.SparseArray; import org.apache.commons.lang3.StringUtils; import java.util.ArrayList; import java.util.List; public class StringArrayUtils { public static boolean isNotBlank(String[] array) { return ((array != null) && (array.length > 0)) && StringUtils.join(array).trim().length() > 0; } public static boolean isBlank(String[] array) { return !isNotBlank(array); } public static boolean areAllBlank(String[]... arrays) { boolean allBlank = true; for (String[] array : arrays) { allBlank &= isBlank(array); } return allBlank; } public static String[] toArray(String... items) { return items; } public static String[] toArray(List<String> list) { if (list != null) { return list.toArray(new String[list.size()]); } return new String[] {}; } public static String[] toArray(SparseArray<List<String>> sparseArray) { List<String> list = new ArrayList<>(); if ((sparseArray != null) && (sparseArray.size() > 0)) { for (int i = 0; i < sparseArray.size(); i++) { list.addAll(sparseArray.valueAt(i)); } } return list.toArray(new String[list.size()]); } }