Display resolution indicates the height and width of the physical display which the android device is using. In android, we can get the display resolution / screen size using following two ways,
Using Window Manager command
$ adb shell wm size
size [reset|WxH|WdpxHdp] [-d DISPLAY_ID] Return or override display size. width and height in pixels unless suffixed with 'dp'.
So, the output of this command for our mobile was,
$ adb shell wm size Physical size: 1080x2160
As we can see, our display width was 1080 dp and height as 2160 dp.
Using Dumpsys command
We can use the dumpsys command as,
$ adb shell dumpsys window | grep DisplayFrames
So, the output of above command for our mobile was,
$ adb shell dumpsys window | grep DisplayFrames DisplayFrames w=1080 h=2160 r=0