Styles: improve black theme

vlc-android/res/drawable/bt_header_fadein_overlay.xml

+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+
+    <gradient
+        android:angle="0"
+        android:endColor="#00FFFFFF"
+        android:startColor="@color/black1" />
+
+</shape>
\ No newline at end of file

vlc-android/res/drawable/bt_header_fadeout_overlay.xml

+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle" >
+
+    <gradient
+        android:angle="0"
+        android:endColor="@color/black1"
+        android:startColor="#00FFFFFF" />
+
+</shape>
\ No newline at end of file

vlc-android/res/layout/about.xml

@@ -20,7 +20,7 @@
                 android:id="@android:id/tabs"
                 android:layout_width="fill_parent"
                 android:layout_height="wrap_content"
-                android:background="?attr/background_menu" />
+                android:background="?attr/background_header" />
 
             <FrameLayout
                 android:id="@android:id/tabcontent"

vlc-android/res/layout/audio_albums_songs.xml

@@ -14,7 +14,7 @@
             android:id="@android:id/tabs"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:background="?attr/background_menu">
+            android:background="?attr/background_header">
         </TabWidget>
 
         <FrameLayout

vlc-android/res/layout/audio_browser.xml

@@ -13,7 +13,7 @@
 	        android:fadingEdge="none"
 	        android:layout_width="fill_parent"
 	        android:layout_height="wrap_content"
-	        android:background="?attr/background_menu">
+	        android:background="?attr/background_header">
 	        <LinearLayout
 	            android:id="@+id/header_layout"
 	            android:layout_width="wrap_content"
@@ -65,14 +65,14 @@
 	        android:layout_alignBottom="@+id/header"
 	        android:layout_alignLeft="@+id/header"
 	        android:layout_alignTop="@+id/header"
-	        android:background="@drawable/header_fadein_overlay" />
+	        android:background="?attr/header_fadein_overlay" />
 	    <View
 	        android:layout_width="20dip"
 	        android:layout_height="10dip"
 	        android:layout_alignBottom="@+id/header"
 	        android:layout_alignRight="@+id/header"
 	        android:layout_alignTop="@+id/header"
-	        android:background="@drawable/header_fadeout_overlay" />
+	        android:background="?attr/header_fadeout_overlay" />
     </RelativeLayout>
 
     <TextView

vlc-android/res/values/attrs.xml

@@ -8,6 +8,7 @@
     <attr name="playlist_item_footer" format="reference|color" />
     <attr name="background_menu_divider" format="reference|color" />
     <attr name="background_menu" format="reference|color" />
+    <attr name="background_header" format="reference|color" />
     <attr name="background_player" format="reference|color" />
     <attr name="background_playlist" format="reference|color" />
     <attr name="font_default" format="reference|color" />
@@ -30,6 +31,8 @@
 
     <attr name="mini_player_top_shadow" format="reference" />
     <attr name="audio_playlist_shadow" format="reference" />
+    <attr name="header_fadein_overlay" format="reference" />
+    <attr name="header_fadeout_overlay" format="reference" />
 
     <declare-styleable name="SlidingPaneLayout">
         <attr name="overhangSize" format="dimension" />

vlc-android/res/values/colors.xml

@@ -22,4 +22,9 @@
     <color name="action_bar_title">#FFFFFF</color>
     <color name="darkgrey">#ffa0a0a0</color>
 
+    <color name="black1">#0f0f0f</color>
+    <color name="black2">#222222</color>
+
+    <color name="grey1">#393939</color>
+
 </resources>
\ No newline at end of file

vlc-android/res/values/styles.xml

@@ -27,6 +27,7 @@
         <item name="background_menu">@color/background_menu</item>
         <item name="background_player">@color/background_player</item>
         <item name="background_playlist">@color/background_playlist</item>
+        <item name="background_header">@color/background_menu</item>
         <item name="audio_browser_separator">@color/darkorange</item>
         <item name="playlist_item_drag_shadow">@color/darkorange</item>
         <item name="audio_player_header_time">@color/darkorange</item>
@@ -40,19 +41,26 @@
 
         <item name="mini_player_top_shadow">@drawable/mini_player_top_shadow</item>
         <item name="audio_playlist_shadow">@drawable/audio_playlist_shadow</item>
+        <item name="header_fadein_overlay">@drawable/header_fadein_overlay</item>
+        <item name="header_fadeout_overlay">@drawable/header_fadeout_overlay</item>
     </style>
 
     <style name="Theme.VLC.Black" parent="Theme.VLC">
         <item name="android:textColor">@color/white</item>
 
         <item name="font_default">@color/white</item>
-        <item name="background_player">@color/font_default</item>
-        <item name="background_playlist">@color/font_default</item>
+        <item name="item_footer">@color/grey1</item>
+        <item name="playlist_item_footer">@color/grey1</item>
+        <item name="background_player">@color/black1</item>
+        <item name="background_playlist">@color/black2</item>
+        <item name="background_header">@color/black1</item>
         <item name="list_title">@color/bt_list_title</item>
         <item name="android:windowBackground">@color/font_default</item>
 
         <item name="mini_player_top_shadow">@null</item>
         <item name="audio_playlist_shadow">@null</item>
+        <item name="header_fadein_overlay">@drawable/bt_header_fadein_overlay</item>
+        <item name="header_fadeout_overlay">@drawable/bt_header_fadeout_overlay</item>
     </style>
 
     <style name="Theme.VLC.List">