In most cases, if you want to capture and share something specific on your phone’s screen, you have to take a screenshot and then crop down the image before sharing it with others. This might not be the case for too much longer, though, because code found in the Android Nougat 7.1 Android Open Source Project that shows the inclusion of a “partial screenshot” feature could soon make it to our devices.
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As stated in the description of the below video, by changing the code in line 53 of TakeScreenshotService to takeScreenshotPartial(), you can activate the feature on the Nexus 4 — in this case Maxr1998 is running the NitrogenOS ROM. Another Reddit user found that they were able to activate the feature using a physical keyboard and an OTG dongle.
While the functionality isn’t there for the public yet, it’s clear that this is a feature that Google has been testing and is potentially coming soon.