wrap every list item into a frame layout

- to make sure the Selector foreground works on every Android version

app/src/main/res/layout/list_item.xml

@@ -1,10 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout
-    android:id="@+id/item_holder"
+<FrameLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:foreground="@drawable/selector">
+
+    <RelativeLayout
+        android:id="@+id/item_holder"
+        android:layout_width="match_parent"
         android:layout_height="wrap_content"
-    android:foreground="@drawable/selector"
         android:paddingRight="@dimen/activity_margin">
 
         <ImageView
@@ -38,4 +42,5 @@
             android:textColor="@color/details_grey"
             android:textSize="@dimen/details_text_size"/>
 
-</RelativeLayout>
+    </RelativeLayout>
+</FrameLayout>