Android :: Focus The Developer Emulator?

I made an image button in eclipse and I tested it out (ran it) with the emulator in the android sdk package.

<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="@drawable/cat1" /> <!-- pressed -->
<item android:state_focused="true"
android:drawable="@drawable/cat2" /> <!-- focused -->
<item android:drawable="@drawable/cat3" /> <!-- default -->
</selector>

Pressed and Default work with the mouse, but how do you focus it? Or if you can't, do you need to get an android phone?