res/xml/widget_info.xml

<?xml version="1.0" encoding="utf-8"?>
<appwidget-provider xmlns:android="http://schemas.android.com/apk/res/android"
        android:minWidth="220dp"
        android:minHeight="220dp"
        android:updatePeriodMillis="86400000"
        android:previewImage="@drawable/preview"
        android:initialLayout="@layout/appwidget_main"
        android:configure="com.android.gallery3d.widget.WidgetConfigure"/>