How to screencap the smaller display of Samsung Galaxy Fold using ADB 'screencap' command?

Question

I'm trying to take a screenshot of Samsung Galaxy Fold's smaller display.



I use



shell screencap -p /sdcard/testss1.png


but it only captures the main display ― which is off ― and gets a black image.



How to change the display used for capturing?


— Pablo | Sources

Answer

The screencap command can be configured to capture a specific display using the option -d.




-d: specify the physical display ID to capture.
See dumpsys SurfaceFlinger --display-id for valid display IDs.




The output of dumpsys SurfaceFlinger --display-id is a bit longer, therefore you can filter out the display ids:



dumpsys SurfaceFlinger --display-id | grep display_id


On my device I only have one display with display_id=0.



Therefore the final command looks like this (just replace display_id):



shell screencap -d <display_id> -p /sdcard/testss1.png

— Robert | Sources

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