Implement a standalone file manager activity.

Change-Id: Iaf86ef416b979cea4ab3890d3a26f09741392c3d
diff --git a/res/values/styles.xml b/res/values/styles.xml
index 04692f6..bf01bf1 100644
--- a/res/values/styles.xml
+++ b/res/values/styles.xml
@@ -43,4 +43,22 @@
         <item name="android:windowSoftInputMode">stateUnspecified|adjustUnspecified</item>
     </style>
 
+    <style name="StandaloneTheme" parent="android:Theme.Light">
+        <item name="android:actionBarWidgetTheme">@null</item>
+        <item name="android:actionBarTheme">@*android:style/ThemeOverlay.Material.Dark.ActionBar</item>
+        <item name="android:actionBarPopupTheme">@*android:style/ThemeOverlay.Material.Light</item>
+
+        <item name="android:colorPrimaryDark">@*android:color/material_blue_grey_900</item>
+        <item name="android:colorPrimary">@*android:color/material_blue_grey_800</item>
+        <item name="android:colorAccent">@*android:color/material_deep_teal_500</item>
+
+        <item name="android:listDivider">@*android:drawable/list_divider_material</item>
+
+        <item name="android:windowActionBar">false</item>
+        <item name="android:windowActionModeOverlay">true</item>
+        <item name="android:windowNoTitle">true</item>
+
+        <item name="android:windowSoftInputMode">stateUnspecified|adjustUnspecified</item>
+    </style>
+
 </resources>