<?xml version="1.0" encoding="utf-8"?>
  <selector xmlns:android="http://schemas.android.com/apk/res/android" >
      <item android:state_pressed="true" android:drawable="@drawable/upay_ok_s"></item>
      <item android:state_pressed="false" android:drawable="@drawable/upay_ok_n"></item>
  </selector>