Add choice of 7 days to settings for dynamic playlists (#616)

* Add choice of N days to settings for dynamic playlists (#3)

* Code review

app/src/main/java/com/kabouzeid/gramophone/util/CalendarUtil.java

@@ -29,6 +29,18 @@ public class CalendarUtil {
     }
 
     /**
+     * Returns the time elapsed so far last N days in milliseconds.
+     *
+     * @return Time elapsed since N days in milliseconds.
+     */
+    public long getElapsedDays(int numDays) {
+        long elapsed = getElapsedToday();
+        elapsed += numDays * MS_PER_DAY;
+
+        return elapsed;
+    }
+
+     /**
      * Returns the time elapsed so far this week in milliseconds.
      *
      * @return Time elapsed this week in milliseconds.

app/src/main/java/com/kabouzeid/gramophone/util/PreferenceUtil.java

@@ -290,6 +290,10 @@ public final class PreferenceUtil {
                 interval = calendarUtil.getElapsedWeek();
                 break;
 
+             case "past_seven_days":
+                interval = calendarUtil.getElapsedDays(7);
+                break;
+
             case "past_three_months":
                 interval = calendarUtil.getElapsedMonths(3);
                 break;

app/src/main/res/values/strings.xml

@@ -106,6 +106,7 @@
     <string name="never">Never</string>
     <string name="today">Today</string>
     <string name="this_week">This week</string>
+    <string name="past_seven_days">Past 7 days</string>
     <string name="this_month">This month</string>
     <string name="past_three_months">Past 3 months</string>
     <string name="this_year">This year</string>

app/src/main/res/values/strings_activity_settings.xml

@@ -27,6 +27,7 @@
     <string-array name="pref_playlists_recently_played_interval_titles">
         <item>@string/today</item>
         <item>@string/this_week</item>
+        <item>@string/past_seven_days</item>
         <item>@string/this_month</item>
         <item>@string/past_three_months</item>
         <item>@string/this_year</item>
@@ -35,6 +36,7 @@
     <string-array name="pref_playlists_recently_played_interval_values">
         <item>today</item>
         <item>this_week</item>
+        <item>past_seven_days</item>
         <item>this_month</item>
         <item>past_three_months</item>
         <item>this_year</item>
@@ -43,6 +45,7 @@
     <string-array name="pref_playlists_last_added_interval_titles">
         <item>@string/today</item>
         <item>@string/this_week</item>
+        <item>@string/past_seven_days</item>
         <item>@string/this_month</item>
         <item>@string/past_three_months</item>
         <item>@string/this_year</item>
@@ -51,6 +54,7 @@
     <string-array name="pref_playlists_last_added_interval_values">
         <item>today</item>
         <item>this_week</item>
+        <item>past_seven_days</item>
         <item>this_month</item>
         <item>past_three_months</item>
         <item>this_year</item>