Use correct size key backgrounds to avoid scaling.

Also increase padding at the bottom of the keyboard, below the spacebar.

res/drawable-land/btn_keyboard_key.xml

+<?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");
+     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">
+
+    <!-- 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>

res/drawable/btn_keyboard_key.xml

+<?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");
+     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">
+
+    <!-- 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>

res/layout/input.xml

@@ -24,4 +24,6 @@
         android:layout_alignParentBottom="true"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
+        android:background="@drawable/keyboard_background"
+        android:keyBackground="@drawable/btn_keyboard_key"
         />