Try this
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_enabled="false"
android:drawable="@drawable/default_bgnd" />
<item android:state_focused="true"
android:drawable="@drawable/new_green" />
<item android:state_pressed="true"
android:drawable="@drawable/new_green" />
<item android:state_checked="true"
android:drawable="@drawable/new_green"/>
<item android:state_selected="true"
android:drawable="@drawable/new_green" />
</selector>
Place this xml in drawables folder and Set this as the Backgroud to your button in xml Good Luck