Android Using layer-list for button selector

Step-1create three different layer_list xml under drawable folder for three different state of button. example the name of those xml is layer1.xml, layer2.xml, layer3.xml

<?xml version="1.0" encoding="utf-8"?><layer-list    xmlns:android="http://schemas.android.com/apk/res/android"    >    <item>        <shape            xmlns:android="http://schemas.android.com/apk/res/android"            android:shape="rectangle"            >            <gradient                android:angle="270"                android:startColor="#0000ff"                android:endColor="#0000dd"                android:type="linear"                />            </shape>    </item></layer-list>

Step-2create a selector xml named as btn_background.xml and pass the layer_list xml in drawable attribute

<selector    xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_pressed="true" android:drawable="@drawable/layer1">    </item>    <item android:state_focused="true" android:drawable="@drawable/layer2">    </item>    <item android:drawable="@drawable/layer3">            </item></selector>

step-3Set the selector xml as background of the button android:background="@drawable/btn_background"

Mygod's answer is actually better than the accepted one. It works and only needs one xml file. Here's something similar that I did. It sets the background under a drawable with transparencies. The same could be done with a background and a shape:

<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_selected="true">        <layer-list>            <item android:drawable="@color/Black"/>            <item android:drawable="@drawable/notes_white"/>        </layer-list>    </item>    <item>        <layer-list>            <item android:drawable="@color/White"/>            <item android:drawable="@drawable/notes_black"/>        </layer-list>    </item></selector>

Just replace the shape tag with your layer-list and everything will work fine.