you don't need an API....
'''
#!/bin/bash

Get screen resolution

screen_size=$(dumpsys window | grep mUnrestrictedScreen | cut -d'=' -f2 | cut -d' ' -f1)
echo "Screen resolution: ${screen_size}"
'''
name that something . sh and $ bash your name.sh

if you want a program here is one in kootlin

'''
val displayMetrics = DisplayMetrics()
windowManager.defaultDisplay.getMetrics(displayMetrics)
val height = displayMetrics.heightPixels
val width = displayMetrics.widthPixels
'''

get_screen_res.py
'''
import subprocess

def get_screen_resolution():
result = subprocess.run(['dumpsys', 'window'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True, check=True)
lines = result.stdout.splitlines()

for line in lines:
    if 'mUnrestrictedScreen' in line:
        screen_size = line.split('=')[1].split()[0]
        return screen_size

print(f"Screen resolution: {get_screen_resolution()}")
'''

@0m364

~ $ dumpsys window
Can't find service: window

Android 12.0

That command requires adb shell, to work on all devices

@0m364

~ $ dumpsys window
Can't find service: window

Android 12.0

That command requires adb shell, to work on all devices

you are correct I was working from my rooted device none of my commands work non root I am seeing now.. I will attempt to find a work around but since dumpsys is at a level termux doesn't access without root I'm not seeing a straightforward or easy way to do this... possibly by implementing something with x11 where it tries to determine screen size before providing a gui instead just display the values... I'll play around with it al little bit later... there should be a way to display screen sizes and frame rates

dumpsys is at a level termux doesn't access without root

adb can be installed with

pkg i android-tools

but the pairing+connecting process is a big pain. The pairing-port and the connection-port are different, and multi-window must be used for pairing.

possibly by implementing something with x11 where it tries to determine screen size before providing a gui instead just display the values...

That's an interesting approach! I have no idea how to use the x11 API, but I guess it'll work

none of the approaches you guys mention does work in non-rooted devices, even dumpsys isn't available without root.
can't this feature be added to the api?

none of the approaches you guys mention does work

Which Android version? Perhaps Google hardened the system again.

can't this feature be added to the api?

It's technically possible

I have added a pull request to fix this issue. Would you like to test the packages from GitHub Actions artifacts of that pull request? Link https://github.com/termux/termux-api/actions/runs/10864561131