android - Image button focus isn't working -

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i'm brand-new android, , i've been trying make image button 3 images, default, focused, , pressed. i've tried lot of examples i've found, can't seem make button respond focus.

i found following example on forum, , displays button, , responds being pressed, doesn't change on focus. can tell me why?

are using selectors changing drawable behind button? example, did use android:src="@drawable/selector1. selector code button should (more description here):

<?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/but1_pressed" />     <item android:state_focused="true" android:drawable="@drawable/but1_focused" />      <item android:drawable="@drawable/but1_default" />  </selector>

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