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      1 /*
      2  * Copyright (C) 2015 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.deskclock.data;
     18 
     19 import android.content.ContentResolver;
     20 import android.content.Context;
     21 import android.database.ContentObserver;
     22 import android.media.Ringtone;
     23 import android.media.RingtoneManager;
     24 import android.net.Uri;
     25 import android.os.Handler;
     26 import android.provider.Settings;
     27 import android.util.ArrayMap;
     28 
     29 import com.android.deskclock.LogUtils;
     30 import com.android.deskclock.R;
     31 import com.android.deskclock.provider.Alarm;
     32 
     33 import java.util.Map;
     34 
     35 /**
     36  * All alarm data will eventually be accessed via this model.
     37  */
     38 final class AlarmModel {
     39 
     40     private final Context mContext;
     41 
     42     /** The model from which settings are fetched. */
     43     private final SettingsModel mSettingsModel;
     44 
     45     /** The uri of the default ringtone to play for new alarms; mirrors last selection. */
     46     private Uri mDefaultAlarmRingtoneUri;
     47 
     48     /** Maps ringtone uri to ringtone title; looking up a title from scratch is expensive. */
     49     private final Map<Uri, String> mRingtoneTitles = new ArrayMap<>(8);
     50 
     51     AlarmModel(Context context, SettingsModel settingsModel) {
     52         mContext = context;
     53         mSettingsModel = settingsModel;
     54 
     55         // Clear caches affected by system settings when system settings change.
     56         final ContentResolver cr = mContext.getContentResolver();
     57         final ContentObserver observer = new SystemAlarmAlertChangeObserver();
     58         cr.registerContentObserver(Settings.System.DEFAULT_ALARM_ALERT_URI, false, observer);
     59     }
     60 
     61     Uri getDefaultAlarmRingtoneUri() {
     62         if (mDefaultAlarmRingtoneUri == null) {
     63             mDefaultAlarmRingtoneUri = mSettingsModel.getDefaultAlarmRingtoneUri();
     64         }
     65 
     66         return mDefaultAlarmRingtoneUri;
     67     }
     68 
     69     void setDefaultAlarmRingtoneUri(Uri uri) {
     70         mSettingsModel.setDefaultAlarmRingtoneUri(uri);
     71         mDefaultAlarmRingtoneUri = uri;
     72     }
     73 
     74     String getAlarmRingtoneTitle(Uri uri) {
     75         // Special case: no ringtone has a title of "Silent".
     76         if (Alarm.NO_RINGTONE_URI.equals(uri)) {
     77             return mContext.getString(R.string.silent_ringtone_title);
     78         }
     79 
     80         // Check the cache.
     81         String title = mRingtoneTitles.get(uri);
     82 
     83         if (title == null) {
     84             // This is slow because a media player is created during Ringtone object creation.
     85             final Ringtone ringtone = RingtoneManager.getRingtone(mContext, uri);
     86             if (ringtone == null) {
     87                 LogUtils.e("No ringtone for uri: %s", uri);
     88                 return mContext.getString(R.string.unknown_ringtone_title);
     89             }
     90 
     91             // Cache the title for later use.
     92             title = ringtone.getTitle(mContext);
     93             mRingtoneTitles.put(uri, title);
     94         }
     95         return title;
     96     }
     97 
     98     /**
     99      * This receiver is notified when system settings change. Cached information built on
    100      * those system settings must be cleared.
    101      */
    102     private final class SystemAlarmAlertChangeObserver extends ContentObserver {
    103 
    104         private SystemAlarmAlertChangeObserver() {
    105             super(new Handler());
    106         }
    107 
    108         @Override
    109         public void onChange(boolean selfChange) {
    110             super.onChange(selfChange);
    111 
    112             LogUtils.i("Detected change to system default alarm ringtone; clearing caches");
    113 
    114             mDefaultAlarmRingtoneUri = null;
    115 
    116             // Titles such as "Default ringtone (Oxygen)" are wrong after default ringtone changes.
    117             mRingtoneTitles.clear();
    118         }
    119     }
    120 }