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Google cut down app update sizes by 65 percent — but there is a catch

There was a time when updating an app required downloading a whole new version of that app, even if you already had parts of it. These days, however, updating an app really only requires downloading, well, the parts that are different. Google has been figuring out ways to reduce update sizes over the past four years or so and on Tuesday, announced it devised a way to reduce app updates by 65 percent.

The way Google does this is somewhat complicated. Android apps are basically ZIP archives that make use of a few special standards. The archives themselves are compressed to be smaller using a technology called Deflate, which certainly makes the app smaller, but also makes it hard for the changes in updates to be identified.

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Google, however, is now taking a different approach, which it calls file-by-file patching. This approach basically makes it easier to find changes in an app and implement those changes in a new Android APK. Check out the data savings Google has been able to achieve:

file-by-file
Image used with permission by copyright holder

File-by-file patching basically works by comparing new and old archives. Google goes through these to identify the changes, applies the changes, then checks to ensure that the patched app matches the updated version on the Google Play Store.

There is a downside to this method — it takes longer for your phone to process. In fact, by cutting the patch size in half, it will probably double the amount of time it takes to install the update and it is a lot harder for older devices to handle the updates.

Because of the fact that it takes longer, Google is not implementing the change for all apps just yet — for now, only auto-updates that take place in the background will use the new update method.

Christian de Looper
Christian de Looper is a long-time freelance writer who has covered every facet of the consumer tech and electric vehicle…
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