1 /*
2  * Copyright (C) 2016 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.dialer.voicemailstatus;
18 
19 import android.content.Context;
20 import android.content.SharedPreferences;
21 import android.database.Cursor;
22 import android.preference.PreferenceManager;
23 import android.support.annotation.Nullable;
24 import com.android.dialer.database.CallLogQueryHandler;
25 
26 /**
27  * Helper class to check whether visual voicemail is enabled.
28  *
29  * <p>Call isVisualVoicemailEnabled() to retrieve the result.
30  *
31  * <p>The result is cached and saved in a SharedPreferences, stored as a boolean in
32  * PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER. Every time a new instance is created, it will try to
33  * restore the cached result from the SharedPreferences.
34  *
35  * <p>Call asyncUpdate() to make a CallLogQuery to check the actual status. This is a async call so
36  * isVisualVoicemailEnabled() will not be affected immediately.
37  *
38  * <p>If the status has changed as a result of asyncUpdate(),
39  * Callback.onVisualVoicemailEnabledStatusChanged() will be called with the new value.
40  */
41 public class VisualVoicemailEnabledChecker implements CallLogQueryHandler.Listener {
42 
43   public static final String PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER =
44       "has_active_voicemail_provider";
45   private SharedPreferences prefs;
46   private boolean hasActiveVoicemailProvider;
47   private CallLogQueryHandler callLogQueryHandler;
48   private Context context;
49   private Callback callback;
50 
VisualVoicemailEnabledChecker(Context context, @Nullable Callback callback)51   public VisualVoicemailEnabledChecker(Context context, @Nullable Callback callback) {
52     this.context = context;
53     this.callback = callback;
54     prefs = PreferenceManager.getDefaultSharedPreferences(this.context);
55     hasActiveVoicemailProvider = prefs.getBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, false);
56   }
57 
58   /**
59    * @return whether visual voicemail is enabled. Result is cached, call asyncUpdate() to update the
60    *     result.
61    */
isVisualVoicemailEnabled()62   public boolean isVisualVoicemailEnabled() {
63     return hasActiveVoicemailProvider;
64   }
65 
66   /**
67    * Perform an async query into the system to check the status of visual voicemail. If the status
68    * has changed, Callback.onVisualVoicemailEnabledStatusChanged() will be called.
69    */
asyncUpdate()70   public void asyncUpdate() {
71     callLogQueryHandler = new CallLogQueryHandler(context, context.getContentResolver(), this);
72     callLogQueryHandler.fetchVoicemailStatus();
73   }
74 
75   @Override
onVoicemailStatusFetched(Cursor statusCursor)76   public void onVoicemailStatusFetched(Cursor statusCursor) {
77     boolean hasActiveVoicemailProvider =
78         VoicemailStatusHelper.getNumberActivityVoicemailSources(statusCursor) > 0;
79     if (hasActiveVoicemailProvider != this.hasActiveVoicemailProvider) {
80       this.hasActiveVoicemailProvider = hasActiveVoicemailProvider;
81       prefs
82           .edit()
83           .putBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, this.hasActiveVoicemailProvider)
84           .apply();
85       if (callback != null) {
86         callback.onVisualVoicemailEnabledStatusChanged(this.hasActiveVoicemailProvider);
87       }
88     }
89   }
90 
91   @Override
onVoicemailUnreadCountFetched(Cursor cursor)92   public void onVoicemailUnreadCountFetched(Cursor cursor) {
93     // Do nothing
94   }
95 
96   @Override
onMissedCallsUnreadCountFetched(Cursor cursor)97   public void onMissedCallsUnreadCountFetched(Cursor cursor) {
98     // Do nothing
99   }
100 
101   @Override
onCallsFetched(Cursor combinedCursor)102   public boolean onCallsFetched(Cursor combinedCursor) {
103     // Do nothing
104     return false;
105   }
106 
107   public interface Callback {
108 
109     /** Callback to notify enabled status has changed to the @param newValue */
onVisualVoicemailEnabledStatusChanged(boolean newValue)110     void onVisualVoicemailEnabledStatusChanged(boolean newValue);
111   }
112 }
113