packages/SystemUI/res/drawable/sysbar_wifi.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
/* //device/apps/common/res/drawable/stat_sys_battery.xml
**
** Copyright 2007, 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.
*/
-->

<level-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:maxLevel="01" android:drawable="@drawable/sysbar_signal_0" />
    <item android:maxLevel="10" android:drawable="@drawable/sysbar_signal_10" />
    <item android:maxLevel="20" android:drawable="@drawable/sysbar_signal_20" />
    <item android:maxLevel="30" android:drawable="@drawable/sysbar_signal_30" />
    <item android:maxLevel="40" android:drawable="@drawable/sysbar_signal_40" />
    <item android:maxLevel="50" android:drawable="@drawable/sysbar_signal_50" />
    <item android:maxLevel="60" android:drawable="@drawable/sysbar_signal_60" />
    <item android:maxLevel="70" android:drawable="@drawable/sysbar_signal_70" />
    <item android:maxLevel="80" android:drawable="@drawable/sysbar_signal_80" />
    <item android:maxLevel="90" android:drawable="@drawable/sysbar_signal_90" />
    <item android:maxLevel="101" android:drawable="@drawable/sysbar_signal_100" />
</level-list>