android java, most recent modify date for a file

our android app auto backs up photos from mobile to internet. only want to backup the same photo once. our current bug results in backing up same photo from mobile phone to internet several times.

our logic for determining unique photo is:

[url removed, login to view]();

[url removed, login to view]();

if they are same as during previous scan / session, the photo does not get backed up. the part we cannot understand is user has not changed (deleted or edited) photos on their mobile device, but the [url removed, login to view] changes. once [url removed, login to view] changes, our program backs up the photo (but as the exact photo already backed up, we are backing up same photo multiple times).

your job is to be smarter than us. either we are not using the [url removed, login to view](); command properly, or we should use a different logic. eg, is there another way to identify which photos are same as before?

.. cannot use file size because different photos can have same size

.. cannot use file name because some phones use identical standard names (eg., imag001, imag002, program backs up, then user deletes photos, takes new photos, device auto names imag001, imag002)



Habilidades: Engenharia, Mobile App Development, Gestão de projetos, Arquitetura de software, Teste de Software

Veja mais: unique photo, scan app for android, new android phones, get a java job, for several times, eg engineering, device management android, backup photos android, backup android phone, backup android, backing up android phone, android photo backup, android phone backup, android device management, android date, most, Mobile Device Management, Android Job, android java, android app photo, android app bug, android app modify, java mobile phone, android command app, mobile photo device android

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