statusBar 색상, 텍스트 색상 변경

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
       ...
        <!-- Change StatusBar Color-->
        <item name="android:statusBarColor">#ffffff</item>
        <item name="android:windowLightStatusBar">true</item>
    </style>
</resources>