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      1 package com.android.dialer.voicemail;
      2 
      3 
      4 import android.content.Context;
      5 import android.content.SharedPreferences;
      6 import android.database.Cursor;
      7 import android.preference.PreferenceManager;
      8 import android.support.annotation.Nullable;
      9 
     10 import com.android.dialer.calllog.CallLogQueryHandler;
     11 
     12 /**
     13  * Helper class to check whether visual voicemail is enabled.
     14  *
     15  * Call isVisualVoicemailEnabled() to retrieve the result.
     16  *
     17  * The result is cached and saved in a SharedPreferences, stored as a boolean in
     18  * PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER. Every time a new instance is created, it will try to
     19  * restore the cached result from the SharedPreferences.
     20  *
     21  * Call asyncUpdate() to make a CallLogQuery to check the actual status. This is a async call so
     22  * isVisualVoicemailEnabled() will not be affected immediately.
     23  *
     24  * If the status has changed as a result of asyncUpdate(),
     25  * Callback.onVisualVoicemailEnabledStatusChanged() will be called with the new value.
     26  */
     27 public class VisualVoicemailEnabledChecker implements CallLogQueryHandler.Listener {
     28 
     29     public static final String PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER =
     30             "has_active_voicemail_provider";
     31     private SharedPreferences mPrefs;
     32     private boolean mHasActiveVoicemailProvider;
     33     private CallLogQueryHandler mCallLogQueryHandler;
     34     private VoicemailStatusHelper mVoicemailStatusHelper;
     35     private Context mContext;
     36 
     37     public interface Callback {
     38 
     39         /**
     40          * Callback to notify enabled status has changed to the @param newValue
     41          */
     42         void onVisualVoicemailEnabledStatusChanged(boolean newValue);
     43     }
     44 
     45     private Callback mCallback;
     46 
     47     public VisualVoicemailEnabledChecker(Context context, @Nullable Callback callback) {
     48         mContext = context;
     49         mCallback = callback;
     50         mPrefs = PreferenceManager.getDefaultSharedPreferences(mContext);
     51         mVoicemailStatusHelper = new VoicemailStatusHelperImpl();
     52         mHasActiveVoicemailProvider = mPrefs.getBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER,
     53                 false);
     54     }
     55 
     56     /**
     57      * @return whether visual voicemail is enabled. Result is cached, call asyncUpdate() to
     58      * update the result.
     59      */
     60     public boolean isVisualVoicemailEnabled() {
     61         return mHasActiveVoicemailProvider;
     62     }
     63 
     64     /**
     65      * Perform an async query into the system to check the status of visual voicemail.
     66      * If the status has changed, Callback.onVisualVoicemailEnabledStatusChanged() will be called.
     67      */
     68     public void asyncUpdate() {
     69         mCallLogQueryHandler =
     70                 new CallLogQueryHandler(mContext, mContext.getContentResolver(), this);
     71         mCallLogQueryHandler.fetchVoicemailStatus();
     72     }
     73 
     74     @Override
     75     public void onVoicemailStatusFetched(Cursor statusCursor) {
     76         boolean hasActiveVoicemailProvider =
     77                 mVoicemailStatusHelper.getNumberActivityVoicemailSources(statusCursor) > 0;
     78         if (hasActiveVoicemailProvider != mHasActiveVoicemailProvider) {
     79             mHasActiveVoicemailProvider = hasActiveVoicemailProvider;
     80             mPrefs.edit().putBoolean(PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER,
     81                     mHasActiveVoicemailProvider);
     82             if (mCallback != null) {
     83                 mCallback.onVisualVoicemailEnabledStatusChanged(mHasActiveVoicemailProvider);
     84             }
     85         }
     86     }
     87 
     88     @Override
     89     public void onVoicemailUnreadCountFetched(Cursor cursor) {
     90         // Do nothing
     91     }
     92 
     93     @Override
     94     public void onMissedCallsUnreadCountFetched(Cursor cursor) {
     95         // Do nothing
     96     }
     97 
     98     @Override
     99     public boolean onCallsFetched(Cursor combinedCursor) {
    100         // Do nothing
    101         return false;
    102     }
    103 }
    104