1 /*
2  * Copyright (C) 2021 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.settings.utils;
18 
19 import android.icu.text.ListFormatter;
20 import android.text.TextUtils;
21 
22 import java.util.List;
23 import java.util.Locale;
24 
25 /**
26  * This class implements some common methods to process with locales
27  */
28 public class LocaleUtils {
29 
30     /**
31      * Returns a character sequence concatenating the items with the localized comma.
32      *
33      * @param items items to be concatenated
34      */
getConcatenatedString(List<CharSequence> items)35     public static CharSequence getConcatenatedString(List<CharSequence> items) {
36         final ListFormatter listFormatter = ListFormatter.getInstance(Locale.getDefault());
37         final CharSequence lastItem =  items.get(items.size() - 1);
38         items.add("fake last item");
39 
40         // For English with "{0}, {1}, and {2}", the pattern is "{0}, {1}, and {2}".
41         // To get "{0}, {1}, {2}", we add a {fake item}, then the pattern result would be
42         // "{0}, {1}, {2} and {fake item}", then get the substring with the end index of the
43         // last item.
44         final String formatted = listFormatter.format(items);
45         return formatted.subSequence(0, TextUtils.indexOf(formatted, lastItem) + lastItem.length());
46     }
47 }
48