res/drawable/gears_button.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/*
 * Copyright 2008, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
*/
-->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:state_focused="true" android:state_pressed="false"
    android:state_enabled="true"
    android:drawable="@drawable/gears_button_selected" />
  <item android:state_enabled="true" android:state_pressed="true"
    android:drawable="@drawable/gears_button_pressed" />
  <item android:state_enabled="true" android:state_focused="false"
    android:state_pressed="false"
    android:drawable="@drawable/gears_button_default" />
  <item android:drawable="@drawable/gears_button_default" />
</selector>