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      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 mPrefs;
     46   private boolean mHasActiveVoicemailProvider;
     47   private CallLogQueryHandler mCallLogQueryHandler;
     48   private VoicemailStatusHelper mVoicemailStatusHelper;
     49   private Context mContext;
     50   private Callback mCallback;
     51 
     52   public VisualVoicemailEnabledChecker(Context context, @Nullable Callback callback) {
     53     mContext = context;
     54     mCallback = callback;
     55     mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
     56     mVoicemailStatusHelper = new VoicemailStatusHelper();
     57     mHasActiveVoicemailProvider = mPrefs.getBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, false);
     58   }
     59 
     60   /**
     61    * @return whether visual voicemail is enabled. Result is cached, call asyncUpdate() to update the
     62    *     result.
     63    */
     64   public boolean isVisualVoicemailEnabled() {
     65     return mHasActiveVoicemailProvider;
     66   }
     67 
     68   /**
     69    * Perform an async query into the system to check the status of visual voicemail. If the status
     70    * has changed, Callback.onVisualVoicemailEnabledStatusChanged() will be called.
     71    */
     72   public void asyncUpdate() {
     73     mCallLogQueryHandler = new CallLogQueryHandler(mContext, mContext.getContentResolver(), this);
     74     mCallLogQueryHandler.fetchVoicemailStatus();
     75   }
     76 
     77   @Override
     78   public void onVoicemailStatusFetched(Cursor statusCursor) {
     79     boolean hasActiveVoicemailProvider =
     80         mVoicemailStatusHelper.getNumberActivityVoicemailSources(statusCursor) > 0;
     81     if (hasActiveVoicemailProvider != mHasActiveVoicemailProvider) {
     82       mHasActiveVoicemailProvider = hasActiveVoicemailProvider;
     83       mPrefs
     84           .edit()
     85           .putBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, mHasActiveVoicemailProvider)
     86           .apply();
     87       if (mCallback != null) {
     88         mCallback.onVisualVoicemailEnabledStatusChanged(mHasActiveVoicemailProvider);
     89       }
     90     }
     91   }
     92 
     93   @Override
     94   public void onVoicemailUnreadCountFetched(Cursor cursor) {
     95     // Do nothing
     96   }
     97 
     98   @Override
     99   public void onMissedCallsUnreadCountFetched(Cursor cursor) {
    100     // Do nothing
    101   }
    102 
    103   @Override
    104   public boolean onCallsFetched(Cursor combinedCursor) {
    105     // Do nothing
    106     return false;
    107   }
    108 
    109   public interface Callback {
    110 
    111     /** Callback to notify enabled status has changed to the @param newValue */
    112     void onVisualVoicemailEnabledStatusChanged(boolean newValue);
    113   }
    114 }
    115