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Apps Syncing data from online without redownloading unchanged data

cDubU

Newbie
Hi there everyone! I am conceptually building an app now that would require photos to be changed semi regularly without the need to update the app itself. My plan was to have a JSON or SQL database online with two values: a version number and a string to the URL of the photo. When the string is changed, the version goes up by one. When the user refreshes, the app will compare its versions with the online versions. (Perhaps just check if !string.equals(onlineString) instead?) But for some reason this doesn't feel right... As though android has something for this already. Is there a better way of doing this?

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