ich-android/app/src/main/res/values/style.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style
        name="my_edittext_style"
        parent="@android:style/Widget.EditText">
        <item
            name="android:background">@drawable/selector_edittext_bg
        </item>
    </style>
</resources>