Change folderFillColor to colorBackgroundFloating.

There seems to be some nuance that prevents me from defining it once in
the base theme, so just updated all of them individually to prevent
any edge case from slipping through.

Bug: 188095988
Test: manual
Change-Id: I1dea639f174fa4ec09bda93a6e2017993b2007a5
diff --git a/res/values/styles.xml b/res/values/styles.xml
index df617ea..757c495 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -48,7 +48,7 @@
         <item name="workspaceStatusBarScrim">@drawable/workspace_bg</item>
         <item name="widgetsTheme">@style/WidgetContainerTheme</item>
         <item name="folderDotColor">?android:attr/colorPrimary</item>
-        <item name="folderFillColor">?android:attr/colorBackground</item>
+        <item name="folderFillColor">?android:attr/colorBackgroundFloating</item>
         <item name="folderIconBorderColor">?android:attr/colorPrimary</item>
         <item name="folderTextColor">?android:attr/textColorPrimary</item>
         <item name="isFolderDarkText">true</item>
@@ -71,7 +71,7 @@
     </style>
 
     <style name="LauncherTheme.DarkMainColor" parent="@style/LauncherTheme">
-        <item name="folderFillColor">#FF3C4043</item> <!-- 100% GM2 800 -->
+        <item name="folderFillColor">?android:attr/colorBackgroundFloating</item>
         <item name="folderTextColor">?attr/workspaceTextColor</item>
         <item name="isFolderDarkText">?attr/isWorkspaceDarkText</item>
         <item name="folderHintColor">@color/folder_hint_text_color_dark</item>
@@ -87,7 +87,7 @@
         <item name="isWorkspaceDarkText">true</item>
         <item name="workspaceStatusBarScrim">@null</item>
         <item name="folderDotColor">#FF464646</item>
-        <item name="folderFillColor">#CDFFFFFF</item>
+        <item name="folderFillColor">?android:attr/colorBackgroundFloating</item>
         <item name="folderIconBorderColor">#FF80868B</item>
         <item name="folderTextColor">?attr/workspaceTextColor</item>
         <item name="isFolderDarkText">true</item>
@@ -109,7 +109,7 @@
         <item name="popupColorTertiary">@color/popup_color_tertiary_dark</item>
         <item name="widgetsTheme">@style/WidgetContainerTheme.Dark</item>
         <item name="folderDotColor">?android:attr/colorPrimary</item>
-        <item name="folderFillColor">?android:attr/colorBackground</item>
+        <item name="folderFillColor">?android:attr/colorBackgroundFloating</item>
         <item name="folderIconBorderColor">?android:attr/colorPrimary</item>
         <item name="folderTextColor">?android:attr/textColorPrimary</item>
         <item name="isFolderDarkText">false</item>
@@ -123,7 +123,7 @@
     </style>
 
     <style name="LauncherTheme.Dark.DarkMainColor" parent="@style/LauncherTheme.Dark">
-        <item name="folderFillColor">#FF3C4043</item> <!-- 100% GM2 800 -->
+        <item name="folderFillColor">?android:attr/colorBackgroundFloating</item>
         <item name="folderTextColor">@android:color/white</item>
         <item name="isFolderDarkText">false</item>
         <item name="folderHintColor">@color/folder_hint_text_color_light</item>
@@ -132,7 +132,7 @@
 
     <style name="LauncherTheme.Dark.DarkText" parent="@style/LauncherTheme.Dark">
         <item name="android:colorControlHighlight">#19212121</item>
-        <item name="folderFillColor">#CDFFFFFF</item>
+        <item name="folderFillColor">?android:attr/colorBackgroundFloating</item>
         <item name="folderTextColor">?attr/workspaceTextColor</item>
         <item name="isFolderDarkText">?attr/isWorkspaceDarkText</item>
         <item name="folderHintColor">@color/folder_hint_text_color_dark</item>
diff --git a/src/com/android/launcher3/folder/PreviewBackground.java b/src/com/android/launcher3/folder/PreviewBackground.java
index 5ddf84f..4eab63e 100644
--- a/src/com/android/launcher3/folder/PreviewBackground.java
+++ b/src/com/android/launcher3/folder/PreviewBackground.java
@@ -89,8 +89,8 @@
     private static final float ACCEPT_COLOR_MULTIPLIER = 1.5f;
 
     // Expressed on a scale from 0 to 255.
-    private static final int BG_OPACITY = 160;
-    private static final int MAX_BG_OPACITY = 225;
+    private static final int BG_OPACITY = 255;
+    private static final int MAX_BG_OPACITY = 255;
     private static final int SHADOW_OPACITY = 40;
 
     private ValueAnimator mScaleAnimator;