如何在root用户设备上设置屏幕？

Question

I have a rooted android device . I wish to set display off on it at a scheduled time.

How can i set screen off programatically on that? Can we do it using Linux commands?

Thanks.

Answer 1

You can use, adb shell input keyevent

Usage :

adb shell input keyevent [--longpress] <key code number or name>

To Turn your Screen off, use Keycode

26 -->  "KEYCODE_POWER"`

Run this from your prompt:

root@user:/$ adb shell input keyevent 26   

Or this,

root@user:/$ adb shell input keyevent KEYCODE_POWER

Run the above command from your Function/Method : Execute ADB Command through Android Application .

This procedure works for a Non-rooted device too.

Complete List of Events : See Here
Setting up ADB : See Here

Answer 2

For those with the same issue like me: I found on my MTK device following code to turn off the screen, because keyevent 26 doesn't work on my device:

adb shell input keyevent 6

will turn off the devices screen also. To turn on the devices screen, you can do it with keyevent 26 .

The best way to find out which keyevent works for your device is with a tiny bash script like this:

#!/bin/bash
while
do
    count=$(( $count+1 ))
    input keyevent $count
    echo "input keyevent $count"
    sleep 1
done

Answer 3

sleeping="$(adb shell dumpsys power | grep 'mWakefulness=')"
screen="$(adb shell dumpsys nfc| grep 'mScreenState=')"

case "$screen" in
  "mScreenState=OFF")
     echo "* Device is not unlocked."
                 ;;
  "mScreenState=ON_LOCKED")
     echo "* Device is not unlocked."
     sleep 0
     exit ;;
   "mScreenState=ON_UNLOCKED")
       echo "* Locking screen.."
       adb shell input keyevent 26
       echo "* Screen turned off"
       exit
esac

echo -e "$basename$0: internal error -- can't lock screen since it's not unlocked"