res/drawable/transparent_button_background.xml

   1 <?xml version="1.0" encoding="utf-8"?>
   2 <selector xmlns:android="http://schemas.android.com/apk/res/android">
   3     <item android:drawable="@android:color/holo_blue_light" android:state_pressed="true"/>
   4     <item android:drawable="@android:color/holo_blue_light" android:state_pressed="true"/>
   5     <item android:drawable="@android:color/transparent" android:state_selected="false"/>
   6 </selector>