rn-file-opener/android/src/main/res/values/styles.xml

Open file with its default application, clone from https://github.com/huangzuizui/react-native-file-opener

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="button" parent="Widget.AppCompat.Button.Colored">
        <item name="android:background">@drawable/button_background</item>
        <item name="android:color">@android:color/white</item>
    </style>

</resources>