If screen density has been changed by command, the output would be like this: Physical density: 480 Override density: 160 It means the original density of the screen is 480dpi, and currently it is 160dpi.
Note that this state does not identify the Android system has been fully activated and operational in the device during startup device instance can be connected to the adb, but after boot the system before it becomes operational.
Reset to original screen density: adb shell wm density reset Overscan command: adb shell wm overscan 0,0,0,200 Four parameters are left, top, right and bottom margin pixels to the edge, command above means leave 200px in screen bottom clean.
Usage is simple: adb shell monkey -p -v 500 He told specific application to send 500 pseudo-random events.