Using attr icons in preferences

app/src/main/res/xml/preferences.xml

@@ -1,36 +1,35 @@
 <?xml version="1.0" encoding="utf-8"?>
 <PreferenceScreen
-    xmlns:android="http://schemas.android.com/apk/res/android"
-    xmlns:app="http://schemas.android.com/apk/res-auto">
+    xmlns:android="http://schemas.android.com/apk/res/android">
     <Preference
         android:key="prefScreenInterface"
         android:title="@string/user_interface_label"
-        android:icon="@drawable/ic_remove_red_eye_grey600_18dp" />
+        android:icon="?attr/type_video" />
 
     <Preference
             android:key="prefScreenPlayback"
             android:title="@string/playback_pref"
-            android:icon="@drawable/ic_play_arrow_grey600_24dp" />
+            android:icon="?attr/av_play" />
 
     <Preference
             android:key="prefScreenDownloads"
             android:title="@string/downloads_label"
-            android:icon="@drawable/ic_file_download_grey600_24dp" />
+            android:icon="?attr/av_download" />
 
     <Preference
             android:key="prefScreenServices"
             android:title="@string/services_label"
-            android:icon="@drawable/ic_star_grey600_24dp" />
+            android:icon="?attr/ic_unfav" />
 
     <Preference
             android:key="prefScreenStorage"
             android:title="@string/storage_pref"
-            android:icon="@drawable/ic_sd_grey600_24dp" />
+            android:icon="?attr/storage" />
 
     <Preference
             android:key="statistics"
             android:title="@string/statistics_label"
-            android:icon="@drawable/ic_poll_box_grey600_24dp" />
+            android:icon="?attr/statistics" />
 
     <PreferenceCategory android:title="@string/project_pref">
         <Preference

core/src/main/res/values/attrs.xml

@@ -12,6 +12,8 @@
     <attr name="av_rewind" format="reference"/>
     <attr name="content_discard" format="reference"/>
     <attr name="content_new" format="reference"/>
+    <attr name="storage" format="reference"/>
+    <attr name="statistics" format="reference"/>
     <attr name="feed" format="reference"/>
     <attr name="location_web_site" format="reference"/>
     <attr name="navigation_accept" format="reference"/>

core/src/main/res/values/styles.xml

@@ -12,6 +12,8 @@
         <item name="buttonStyle">@style/Widget.AntennaPod.Button</item>
         <item name="alertDialogTheme">@style/AntennaPod.Dialog.Light</item>
         <item type="attr" name="action_bar_icon_color">@color/grey600</item>
+        <item type="attr" name="storage">@drawable/ic_sd_grey600_24dp</item>
+        <item type="attr" name="statistics">@drawable/ic_poll_box_grey600_24dp</item>
         <item type="attr" name="action_about">@drawable/ic_info_grey600_24dp</item>
         <item type="attr" name="action_search">@drawable/ic_search_grey600_24dp</item>
         <item type="attr" name="action_stream">@drawable/ic_settings_input_antenna_grey600_24dp</item>
@@ -75,6 +77,8 @@
         <item name="progressBarTheme">@style/ProgressBarDark</item>
         <item name="alertDialogTheme">@style/AntennaPod.Dialog.Dark</item>
         <item type="attr" name="action_bar_icon_color">@color/white</item>
+        <item type="attr" name="storage">@drawable/ic_sd_white_24dp</item>
+        <item type="attr" name="statistics">@drawable/ic_poll_box_white_24dp</item>
         <item type="attr" name="action_about">@drawable/ic_info_white_24dp</item>g
         <item type="attr" name="action_search">@drawable/ic_search_white_24dp</item>
         <item type="attr" name="action_stream">@drawable/ic_settings_input_antenna_white_24dp</item>