android-34-ext8/data/res/drawable/language_picker_item_bg_selected.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

  <item
      android:bottom="-5dp"
      android:right="-5dp"
      android:top="-5dp">
    <shape android:shape="rectangle" >
      <solid android:color="@color/language_picker_item_selected_bg" />

      <stroke
          android:width="2dp"
          android:color="@color/language_picker_item_selected_stroke" />
    </shape>
  </item>

</layer-list>