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One of my concerns with the security of any application is whether a virus can look at the data in your application while it is in memory and then pump it out to some server that is under their control. I am guessing that the online banking services somehow prevent this and certainly when I use the banking app on my phone they seem to use a digital rights function to prevent screenshots.
Is it possible and is it your intention to ensure that data in the PC application and the Android app is secure against this sort of attack? It would certainly be good to use Lexiy to store things like passwords but I'd have to be sure that the data couldn't be scraped before I used it for this purpose.