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.settings.datetime.timezone; 18 19 import android.app.settings.SettingsEnums; 20 import android.icu.util.TimeZone; 21 22 import com.android.settings.R; 23 import com.android.settings.datetime.timezone.model.TimeZoneData; 24 25 import java.util.ArrayList; 26 import java.util.Collections; 27 import java.util.Date; 28 import java.util.List; 29 import java.util.Locale; 30 31 /** 32 * Render a list of fixed offset time zone {@class TimeZoneInfo} into a list view. 33 */ 34 public class FixedOffsetPicker extends BaseTimeZoneInfoPicker { 35 /** 36 * Range of integer fixed UTC offsets shown in the pickers. 37 */ 38 private static final int MIN_HOURS_OFFSET = -14; 39 private static final int MAX_HOURS_OFFSET = +12; 40 FixedOffsetPicker()41 public FixedOffsetPicker() { 42 super(R.string.date_time_select_fixed_offset_time_zones, 43 R.string.search_settings, false, false); 44 } 45 46 @Override getMetricsCategory()47 public int getMetricsCategory() { 48 return SettingsEnums.SETTINGS_ZONE_PICKER_FIXED_OFFSET; 49 } 50 51 @Override getAllTimeZoneInfos(TimeZoneData timeZoneData)52 public List<TimeZoneInfo> getAllTimeZoneInfos(TimeZoneData timeZoneData) { 53 return loadFixedOffsets(); 54 } 55 56 /** 57 * Returns a {@link TimeZoneInfo} for each fixed offset time zone, such as UTC or GMT+4. The 58 * returned list will be sorted in a reasonable way for display. 59 */ loadFixedOffsets()60 private List<TimeZoneInfo> loadFixedOffsets() { 61 final TimeZoneInfo.Formatter formatter = new TimeZoneInfo.Formatter(getLocale(), 62 new Date()); 63 final List<TimeZoneInfo> timeZoneInfos = new ArrayList<>(); 64 timeZoneInfos.add(formatter.format(TimeZone.getFrozenTimeZone("Etc/UTC"))); 65 for (int hoursOffset = MAX_HOURS_OFFSET; hoursOffset >= MIN_HOURS_OFFSET; --hoursOffset) { 66 if (hoursOffset == 0) { 67 // UTC is handled above, so don't add GMT +/-0 again. 68 continue; 69 } 70 final String id = String.format(Locale.US, "Etc/GMT%+d", hoursOffset); 71 timeZoneInfos.add(formatter.format(TimeZone.getFrozenTimeZone(id))); 72 } 73 return Collections.unmodifiableList(timeZoneInfos); 74 } 75 } 76