how to adb wait-for-device until the home screen shows up?

Question

I need to unlock my screen using adb, and wait-for-device exits way too early(when the device is booting up), and screen unlock fails. Is there a way to detect that the home screen, so I can fire screen unlock then?

This is the command I am using to unlock screen -

adb wait-for-device shell input keyevent 82

score 30 · Answer 1 · edited Dec 09 '16 at 20:18

30

well wait-for-device, as you already realized only waits until the adb daemon properly started. This is already at init time. In order to check for a complete boot you cann ad to your script something like:

in pseudo:

wait-for-device
long as getprop sys.boot_completed != 1 sleep some seconds check getprop sys.boot_completed again
shell input keyevent 82

This should work.

Something like this:

#!/bin/bash

adb wait-for-device

A=$(adb shell getprop sys.boot_completed | tr -d '\r')

while [ "$A" != "1" ]; do
        sleep 2
        A=$(adb shell getprop sys.boot_completed | tr -d '\r')
done

adb shell input keyevent 82

This is not tested so be aware of potential mistakes

edited Dec 09 '16 at 20:18

Lorenzo Polidori

103
2

answered Sep 30 '14 at 13:41

divided-by-zero

982
6
16

Please edit your answer to be easily readable. You have a valid answer, but a little clarity would help everyone. Thanks – HasH_BrowN Sep 30 '14 at 16:09
answer is now edited. Hope this helps you :) – divided-by-zero Oct 06 '14 at 14:58
good answer +1, now others will be able to follow it. Dont forget to add "Always perform a backup", for those accidental moments;) – HasH_BrowN Oct 06 '14 at 16:10
2

I found that result of getprop had a carriage return after it, so changing the adb command to $(adb shell getprop sys.boot_completed | tr -d '\r') did the trick. This is just trimming out the carriage return character. – CoatedMoose Jan 05 '15 at 21:28
@divided-by-zero please modify your answer to include the trimming mentioned by CoatedMoose. Umang please accept it as a answer as well. – Jayshil Dave Jun 04 '15 at 12:26
trimming is added. thx CoatedMoose – divided-by-zero Jun 08 '15 at 11:15
How would you modify this if there's more than one device/emulator running? – Big McLargeHuge Aug 08 '19 at 00:32

score 18 · Answer 2 · answered Dec 10 '16 at 04:41

18

This is an old question and borderline off-topic but here is how to do it in a single line:

adb wait-for-device shell 'while [[ -z $(getprop sys.boot_completed) ]]; do sleep 1; done; input keyevent 82'

answered Dec 10 '16 at 04:41

Пионерка

406
3
8

score 1 · Answer 3 · answered Jan 14 '17 at 16:54

Here's what I came up with:

adb wait-for-device shell <<ENDSCRIPT
echo -n "Waiting for device to boot "
echo "" > /data/local/tmp/zero
getprop dev.bootcomplete > /data/local/tmp/bootcomplete
while cmp /data/local/tmp/zero /data/local/tmp/bootcomplete; do 
{
    echo -n "."
    sleep 1
    getprop dev.bootcomplete > /data/local/tmp/bootcomplete
}; done
echo "Booted."
exit
ENDSCRIPT

echo "Waiting 30 secs for us to be really booted"
sleep 30

echo "Unlocking screen"
adb shell "input keyevent 82"

how to adb wait-for-device until the home screen shows up?

3 Answers3