rn-file-opener/android/src/main/res/drawable/button_background.xml

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

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">
    <solid android:color="@color/colorLightBlue"></solid>

    <padding
        android:bottom="5dp"
        android:left="10dp"
        android:top="5dp"></padding>
</shape>