tests/GadgetHost/res/xml/gadget_info.xml

<gadget-provider xmlns:android="http://schemas.android.com/apk/res/android"
    android:minWidth="40dp"
    android:minHeight="30dp"
    android:updatePeriodMillis="30000"
    android:initialLayout="@layout/test_gadget"
    >
</gadget-provider>