Use correct size key backgrounds to avoid scaling.

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

<!-- Copyright (C) 2008 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");

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     distributed under the License is distributed on an "AS IS" BASIS,

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

    <!-- Toggle keys. Use checkable/checked state. -->

    <item android:state_checkable="true" android:state_checked="true" 

          android:state_pressed="true"

          android:drawable="@drawable/btn_keyboard_key_pressed_on" />

    <item android:state_checkable="true" android:state_pressed="true"

          android:drawable="@drawable/btn_keyboard_key_pressed_off" />

    <item android:state_checkable="true" android:state_checked="true"

          android:drawable="@drawable/btn_keyboard_key_normal_on" />

    <item android:state_checkable="true"

          android:drawable="@drawable/btn_keyboard_key_normal_off" />

    <!-- Normal keys -->

    <item android:state_pressed="true"

          android:drawable="@drawable/btn_keyboard_key_pressed" />

    <item

          android:drawable="@drawable/btn_keyboard_key_normal" />

</selector>