If database implementations were perfect you would never see the files for ebooks added to Calibre, or they'd be in the database.
Even if there was an Android version of Calibre you couldn't safely move an SD card between that and a Windows PC version of Android.
The "Portable" version of Calibre is really just for a Windows PC that doesn't have Calibre actually installed. It's Windows version of Calibre program, the SQL database and the "private" ebooks. It's no use to Mac, Linux (they don't need it anyway), iOS or Android.
A true Library is the database, the private media files and the program.
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