Theming: add a SplashScreen for TrackListActivity.

src/main/res/drawable/splashscreen.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:opacity="opaque">
+
+    <!--    TODO DayNight: set background color for dayNight -->
+    <item android:drawable="@android:color/background_dark" />
+
+    <item
+        android:width="300dp"
+        android:height="300dp"
+        android:drawable="@drawable/ic_logo_color_108dp"
+        android:gravity="center_vertical|center_horizontal"
+        tools:targetApi="m" />
+
+</layer-list>

src/main/res/values/themes_custom.xml

@@ -60,4 +60,8 @@ limitations under the License.
         <item name="android:windowBackground">@android:color/transparent</item>
         <item name="android:windowIsFloating">true</item>
     </style>
+
+    <style name="SplashTheme" parent="ThemeCustom">
+        <item name="android:windowBackground">@drawable/splashscreen</item>
+    </style>
 </resources>