android button selector

main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    >

<Button

android:id="@+id/btnTest"  

    android:layout_width="fill_parent" 

    android:layout_height="wrap_content" 

    android:text="@string/hello"

    android:background="@drawable/my_button"

    />

</LinearLayout>

my_button.xml

<?xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_focused="true" android:state_pressed="false" android:drawable="@drawable/focused" />

    <item android:state_focused="true" android:state_pressed="true" android:drawable="@drawable/focusedpressed" />

    <item android:state_focused="false" android:state_pressed="true" android:drawable="@drawable/pressed" />

    <item android:drawable="@drawable/defaultbutton" />

</selector>