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

    <item android:state_pressed="true" android:drawable="@color/press_btn"/>
    <item android:state_enabled="false" android:drawable="@color/gray"/>
    <item android:drawable="@color/normal_btn"/>

</selector>