How to lock Android screen via ADB?

Question

Is there a way to lock the Android screen via the ADB?

I find ways to lock the display in an apk, but I want to lock the screen from the PC via ADB, to simulate a displ

Answer 1

You've already found a solution, but I'll put this code here for reference anyway.

What you could do is to inject event to "press" the power button twice. If you don't know the status of the device (display on/off), check whether the screen is currently on or off and press the power button accordingly.

Here's a simple monkeyrunner script:

import re
from java.util import *
from com.android.monkeyrunner import MonkeyRunner, MonkeyDevice
device = MonkeyRunner.waitForConnection()       # connect to a device
device.shell("input keyevent KEYCODE_POWER")    # turn screen off (or on?)
res = device.shell("dumpsys power")             # fetch power state
m = re.search(r'.*mPowerState=([0-9]+).*', res) # parse the string
if m and int(m.group(1)) == 0:                  # screen is off
  device.shell("input keyevent KEYCODE_POWER")  # turn the screen on