Hi @Liguo Zheng ,
I will recommend you to use Rest Api to create a SharePoint mobile app. You will need to determine whether the mobile app has built-in capabilities to integrate with SharePoint. Some apps may provide direct integration options. If the app doesn't have native SharePoint integration, you can explore options like using SharePoint's REST API or Microsoft Graph API to interact with SharePoint programmatically.
Please refer to the following documents to create a mobile app in SharePoint that contains data from an external data source
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