New notification icon and setting for toolbar opaque

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

@@ -32,6 +32,7 @@
         <item>0</item>
         <item>1</item>
     </string-array>
+    <string name="pref_title_transparent_toolbar">Semi-Transparent toolbar</string>
     <string name="pref_title_show_playback_controller_card">Playback controller card</string>
     <string name="pref_title_colored_navigation_bar_artists">Colored navigation bar artist view</string>
     <string name="pref_title_colored_navigation_bar_albums">Colored navigation bar album view</string>

app/src/main/res/xml/pref_ui.xml

@@ -10,6 +10,11 @@
             android:positiveButtonText="@null"
             android:title="@string/pref_title_general_theme"/>
 
+        <CheckBoxPreference
+            android:defaultValue="true"
+            android:key="transparent_toolbar"
+            android:title="@string/pref_title_transparent_toolbar"/>
+
         <CheckBoxPreference
             android:defaultValue="true"
             android:key="playback_controller_card"