but.........
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>PMFJI, does this Android tool create a native Android application, similar to a Win Forms? And, if you know, would it allow making an app to store data in some "local" space on the Android? That is, would it be conducive to make an app for a disconnected use?

All Apps in mobile systems allow for storing local data for disconnected usage - it is one of their greatest lures. You can depend on the App to find the saved data again - but it is not always certain that such data can be accessed by ***other*** applications in all versions of Android. Most of the times the data store mechansm is SQLite, which can be used from pure Java, Cordova/Phonegap, Titanium, Nativesript. Droidscript, Python on Android (just to name a few where I am certain). One of the reasons SQLite is the most used DB product comes from the fact that on each at least half smart device (from Symbian phones contacts and other data up to up to Thunderbird on PCs there are a couple of SQLite DBs on each device

But the accessibility to other apps reflects more the security approach, somewhat similar to a windows install of programs accessible to single users only, vs. sandboxing in place in Web/browser based approaches, where in newer versions you as well have an option for local storage - only a much more limited storage ability via HTML5 storage specs [or specific code like Google gears]