1 /* 2 * Copyright (C) 2018 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.textclassifier.common.base; 18 19 import android.content.Context; 20 import android.os.Build; 21 import java.util.Locale; 22 23 /** Helper for accessing locale related stuff that works across different platform versions. */ 24 public final class LocaleCompat { 25 LocaleCompat()26 private LocaleCompat() {} 27 28 /** 29 * Returns a well-formed IETF BCP 47 language tag representing this locale. In older platforms, 30 * only the ISO 639 language code will be returned. 31 * 32 * @see Locale#toLanguageTag() 33 */ toLanguageTag(Locale locale)34 public static String toLanguageTag(Locale locale) { 35 if (Build.VERSION.SDK_INT >= 24) { 36 return Api24Impl.toLanguageTag(locale); 37 } 38 return ApiBaseImpl.toLanguageTag(locale); 39 } 40 41 /** Returns the language tags in string for the current resources configuration. */ getResourceLanguageTags(Context context)42 public static String getResourceLanguageTags(Context context) { 43 if (Build.VERSION.SDK_INT >= 24) { 44 return Api24Impl.getResourceLanguageTags(context); 45 } else if (Build.VERSION.SDK_INT >= 21) { 46 return Api21Impl.getResourceLanguageTags(context); 47 } 48 return ApiBaseImpl.getResourceLanguageTags(context); 49 } 50 51 private static class Api24Impl { Api24Impl()52 private Api24Impl() {} 53 toLanguageTag(Locale locale)54 static String toLanguageTag(Locale locale) { 55 return locale.toLanguageTag(); 56 } 57 getResourceLanguageTags(Context context)58 static String getResourceLanguageTags(Context context) { 59 return context.getResources().getConfiguration().getLocales().toLanguageTags(); 60 } 61 } 62 63 private static class Api21Impl { Api21Impl()64 private Api21Impl() {} 65 getResourceLanguageTags(Context context)66 static String getResourceLanguageTags(Context context) { 67 return context.getResources().getConfiguration().locale.toLanguageTag(); 68 } 69 } 70 71 private static class ApiBaseImpl { ApiBaseImpl()72 private ApiBaseImpl() {} 73 toLanguageTag(Locale locale)74 static String toLanguageTag(Locale locale) { 75 return locale.getLanguage(); 76 } 77 getResourceLanguageTags(Context context)78 static String getResourceLanguageTags(Context context) { 79 return context.getResources().getConfiguration().locale.getLanguage(); 80 } 81 } 82 } 83