In my application, I\'m using AutoCompleteTextView. One of the requirements is to hide the divider. I have added AutoCompleteTextView to layout:
Override it with your application theme. In your themes.xml
<style name="AppTheme" parent="@style/Theme.AppCompat.Light.DarkActionBar">
<item name="android:dropDownListViewStyle">@style/DropDownListViewStyle</item>
</style>
<style name="DropDownListViewStyle" parent="@style/Widget.AppCompat.ListView.DropDown">
<item name="android:divider">@android:color/transparent</item>
<item name="android:dividerHeight">0dp</item>
</style>
Credits to: http://daniel-codes.blogspot.com/2012/11/styling-autocompletetextview.html