react-native-doc-viewer/example/ReactDocViewerExample/android/app/src/main/res/values/styles.xml

React Native Native Module Bridge Quicklock Document Viewer for IOS + Android supports pdf, png, jpg, xls, ppt, doc, docx, pptx, xlx + Video Player mp4 supported

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
    </style>

</resources>