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I have a raspberry pi: it is normally run 'headless' (sans monitor). I would like to be able to connect the video output on a Samsung Galaxy Phone. For this exercise, the solution must use a wired connection (HDMI, USB) and not rely on a network connection (SSH / VNC or similar).

My Google search brings up articles of how to cast video from the Android device through HDMI. I would like to wire and direct HDMI into the Android device's display.

Questions:

Assuming there is a cable that can bridge HDMI into the Android device: does Android support wired HDMI capability? What is the nomenclature for the capability?

Bonus: can the same thing be done from the raspberry pi's USB port? That is, direct the video out through a USB port, through a USB cable and into the Android device for display?

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Assuming there is a cable that can bridge HDMI into the Android device: does Android support wired HDMI capability? What is the nomenclature for the capability?

Nothing in the Android Compatibility Definition Document indicates that such a feature is supported by Android.

Consider that HDMI inputs on a PC is usually done via specialized capture cards and that you are asking for physical input to device which normally operates on battery. Remember that any hardware that isn't being sold/used as a 'feature' is a waste of space and power on a phone.

Bonus: can the same thing be done from the raspberry pi's USB port? That is, direct the video out through a USB port, through a USB cable and into the Android device for display?

You would need VNC but this thread indicates that it is possible over USB: https://www.raspberrypi.org/forums/viewtopic.php?t=105336

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