initial focus in views

The description "requestFocus" is prepared for Android layout file.  But button view cannot focused by only that description.  You need to set the "focusableInTouchMode" attribute true.

<Button
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="Start Zero-One"
android:id="@+id/startZo"
android:focusableInTouchMode="true">
<requestFocus/>
</Button>