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      1 /*
      2  * Copyright (C) 2017 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;
     18 
     19 import android.content.Context;
     20 import android.provider.Settings;
     21 import android.provider.Settings.System;
     22 import android.support.v14.preference.SwitchPreference;
     23 import android.support.v7.preference.Preference;
     24 import android.support.v7.preference.TwoStatePreference;
     25 import android.text.TextUtils;
     26 import android.text.format.DateFormat;
     27 import com.android.settings.core.PreferenceControllerMixin;
     28 import com.android.settingslib.core.AbstractPreferenceController;
     29 import java.util.Locale;
     30 
     31 public class AutoTimeFormatPreferenceController extends AbstractPreferenceController
     32           implements PreferenceControllerMixin {
     33 
     34     private static final String KEY_AUTO_24_HOUR = "auto_24hour";
     35 
     36     public AutoTimeFormatPreferenceController(Context context, UpdateTimeAndDateCallback callback) {
     37         super(context);
     38     }
     39 
     40     @Override
     41     public boolean isAvailable() {
     42         return true;
     43     }
     44 
     45     @Override
     46     public String getPreferenceKey() {
     47         return KEY_AUTO_24_HOUR;
     48     }
     49 
     50     @Override
     51     public void updateState(Preference preference) {
     52         if (!(preference instanceof SwitchPreference)) {
     53             return;
     54         }
     55         ((SwitchPreference) preference).setChecked(isAutoTimeFormatSelection(mContext));
     56     }
     57 
     58     @Override
     59     public boolean handlePreferenceTreeClick(Preference preference) {
     60         if (!(preference instanceof TwoStatePreference)
     61             || !TextUtils.equals(KEY_AUTO_24_HOUR, preference.getKey())) {
     62             return false;
     63         }
     64         boolean auto24HourEnabled = ((SwitchPreference) preference).isChecked();
     65         Boolean is24Hour;
     66         if (auto24HourEnabled) {
     67             is24Hour = null;
     68         } else {
     69             is24Hour = is24HourLocale(mContext.getResources().getConfiguration().locale);
     70         }
     71         TimeFormatPreferenceController.update24HourFormat(mContext, is24Hour);
     72         return true;
     73     }
     74 
     75     boolean is24HourLocale(Locale locale) {
     76         return DateFormat.is24HourLocale(locale);
     77     }
     78 
     79     /**
     80      * Returns if the system is currently configured to pick the time format automatically based on
     81      * the locale.
     82      */
     83     static boolean isAutoTimeFormatSelection(Context context) {
     84         return Settings.System.getString(context.getContentResolver(), System.TIME_12_24) == null;
     85     }
     86 }
     87