SunshinePreferences.java 文件源码

/**
 * Returns the last time that a notification was shown (in UNIX time)
 *
 * @param context Used to access SharedPreferences
 * @return UNIX time of when the last notification was shown
 */
public static long getLastNotificationTimeInMillis(Context context) {
    /* Key for accessing the time at which Sunshine last displayed a notification */
    String lastNotificationKey = context.getString(R.string.pref_last_notification);

    /* As usual, we use the default SharedPreferences to access the user's preferences */
    SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences(context);

    /*
     * Here, we retrieve the time in milliseconds when the last notification was shown. If
     * SharedPreferences doesn't have a value for lastNotificationKey, we return 0. The reason
     * we return 0 is because we compare the value returned from this method to the current
     * system time. If the difference between the last notification time and the current time
     * is greater than one day, we will show a notification again. When we compare the two
     * values, we subtract the last notification time from the current system time. If the
     * time of the last notification was 0, the difference will always be greater than the
     * number of milliseconds in a day and we will show another notification.
     */
    long lastNotificationTime = sp.getLong(lastNotificationKey, 0);

    return lastNotificationTime;
}