Clean up cacheColorHint to be better controlled by the theme.

Fixes generic lists in dialog themes, for example.

Change-Id: I0ea1cae1641d8ab3756179ce80245ed0df942115

api/current.xml

@@ -2550,6 +2550,17 @@
  visibility="public"
 >
 </field>
+<field name="colorBackgroundCacheHint"
+ type="int"
+ transient="false"
+ volatile="false"
+ value="16843435"
+ static="true"
+ final="true"
+ deprecated="not deprecated"
+ visibility="public"
+>
+</field>
 <field name="colorForeground"
  type="int"
  transient="false"

core/res/res/values/attrs.xml

@@ -28,6 +28,11 @@
         <attr name="colorForegroundInverse" format="color" />
         <!-- Color that matches (as closely as possible) the window background. -->
         <attr name="colorBackground" format="color" />
+        <!-- This is a hint for a solid color that can be used for caching
+             rendered views.  This will be the color of the background when
+             there is a solid background color; it will be null when the
+             background is a texture or translucent. -->
+        <attr name="colorBackgroundCacheHint" format="color" />
         <!-- Default disabled alpha for widgets that set enabled/disabled alpha programmatically. -->
         <attr name="disabledAlpha" format="float" />
         <!-- Default background dim amount when a menu, dialog, or something similar pops up. -->

core/res/res/values/public.xml

@@ -1175,6 +1175,7 @@
   <public type="attr" name="scrollbarFadeDuration" />
   <public type="attr" name="scrollbarDefaultDelayBeforeFade" />
   <public type="attr" name="fadeScrollbars" />
+  <public type="attr" name="colorBackgroundCacheHint" />
   
   <public type="style" name="Theme.Wallpaper" />
   <public type="style" name="Theme.Wallpaper.NoTitleBar" />

core/res/res/values/styles.xml

@@ -459,12 +459,13 @@
 
     <style name="Widget.ListView" parent="Widget.AbsListView">
         <item name="android:listSelector">@android:drawable/list_selector_background</item>
-        <item name="android:cacheColorHint">?android:attr/colorBackground</item>
+        <item name="android:cacheColorHint">?android:attr/colorBackgroundCacheHint</item>
         <item name="android:divider">@android:drawable/divider_horizontal_dark_opaque</item>
     </style>
     
     <style name="Widget.ListView.White" parent="Widget.AbsListView">
         <item name="android:listSelector">@android:drawable/list_selector_background</item>
+        <item name="android:cacheColorHint">?android:attr/colorBackgroundCacheHint</item>
         <item name="android:divider">@android:drawable/divider_horizontal_bright_opaque</item>
     </style>    
 

core/res/res/values/themes.xml

@@ -30,6 +30,7 @@
         <item name="colorForeground">@android:color/bright_foreground_dark</item>
         <item name="colorForegroundInverse">@android:color/bright_foreground_dark_inverse</item>
         <item name="colorBackground">@android:color/background_dark</item>
+        <item name="colorBackgroundCacheHint">?android:attr/colorBackground</item>
         <item name="disabledAlpha">0.5</item>
         <item name="backgroundDimAmount">0.6</item>
 
@@ -289,6 +290,7 @@
     	 wallpaper appear behind them.  -->
     <style name="Theme.Wallpaper">
         <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowShowWallpaper">true</item>
     </style>
 
@@ -308,6 +310,7 @@
          top of a dark background. -->
     <style name="Theme.WallpaperSettings">
         <item name="android:windowBackground">@android:drawable/screen_background_dark_transparent</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowIsTranslucent">true</item>
         <item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item>
     </style>
@@ -316,6 +319,7 @@
          top of a light background. -->
     <style name="Theme.Light.WallpaperSettings">
         <item name="android:windowBackground">@android:drawable/screen_background_light_transparent</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowIsTranslucent">true</item>
         <item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item>
     </style>
@@ -335,6 +339,7 @@
          flag and appropriate animations for your windows.  -->
     <style name="Theme.Translucent">
         <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowIsTranslucent">true</item>
         <!-- Note that we use the base animation style here (that is no
              animations) because we really have no idea how this kind of
@@ -379,6 +384,8 @@
         <item name="android:windowAnimationStyle">@android:style/Animation.Dialog</item>
         <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
 
+        <item name="android:colorBackgroundCacheHint">@null</item>
+        
         <item name="textAppearance">@android:style/TextAppearance</item>
         <item name="textAppearanceInverse">@android:style/TextAppearance.Inverse</item>
 
@@ -422,6 +429,7 @@
          background, and turns off dimming behind the window. -->
     <style name="Theme.Panel">
         <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowFrame">@null</item>
         <item name="android:windowContentOverlay">@null</item>
         <item name="android:windowIsFloating">true</item>
@@ -436,6 +444,7 @@
          background, and turns off dimming behind the window. -->
     <style name="Theme.Light.Panel">
         <item name="android:windowBackground">@android:color/transparent</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
         <item name="android:windowFrame">@null</item>
         <item name="android:windowContentOverlay">@null</item>
         <item name="android:windowIsFloating">true</item>