awtk/demos/res/raw/ui/kb_int.xml

<keyboard name="keyboard" x="0" y="bottom" w="100%" h="30%">
  <pages x="0" y="0" w="100%" h="100%" active="0">
    <view name="upper" x="0" y="0" w="100%" h="100%" layout="rows:4 cols:3 spacing:2 margin:4">
        <button name="1" text="1"/>
        <button name="2" text="2"/>
        <button name="3" text="3"/>
        <button name="4" text="4"/>
        <button name="5" text="5"/>
        <button name="6" text="6"/>
        <button name="7" text="7"/>
        <button name="8" text="8"/>
        <button name="9" text="9"/>
        <button name="-" style="1:highlight" text="-"/>
        <button name="0" text="0"/>
        <button name="key:backspace" style="1:highlight"><image image="backspace" x="center" y="middle" w="100%" h="100%"/></button>
    </view>
  </pages>
</keyboard>