add black background to theme

Author: UrAvgCode

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

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <style name="Chooser">
+        <item name="android:windowBackground">@color/black</item>
         <item name="android:windowActionBar">false</item>
         <item name="android:windowNoTitle">true</item>
         <item name="android:windowFullscreen">true</item>