Change Device language via ADB

Question

I want to change language via ADB. I try:

adb shell setprop persist.sys.language fr;setprop persist.sys.country CA;stop;sleep 5;start

but I

Answer 1

This is all over the place, to put it simply

setprop will only work on an AVD or a rooted physical device

The alternative is to use the settings in the Launcher.

Rooted device or AVD this works:

<android-sdk path>/platform-tools/adb shell
root@generic:/ # getprop persist.sys.language
getprop persist.sys.language
en
root@generic:/ # setprop persist.sys.language fr
setprop persist.sys.language fr
root@generic:/ # setprop persist.sys.country CA
setprop persist.sys.country CA
root@generic:/ # stop
stop
root@generic:/ # start
start
root@generic:/ # sleep 5
sleep 5
root@generic:/ # getprop |grep lang
getprop |grep lang
[persist.sys.language]: [fr]
root@generic:/ # getprop |grep country
getprop |grep country
[persist.sys.country]: [CA]
root@generic:/ #

Answer 2

The solution to do it without rooting. You can use something like this the below function. The function goes into settings and exercises the UI to change the locale settings.

https://github.com/dtmilano/AndroidViewClient/blob/480ab93dbd01296a68c1ce7109ceb8275d1ed8a7/src/com/dtmilano/android/viewclient.py#L1302

The tricky part is to get to the right language when you are in a different language. You would think the language always maintain the same index in the list, but unfortunately not. So you have to have a solution like this.

Con: You my have to tweak it a little for handling different phones, the settings may have a different order.

Answer 3

For Android M or newer, you need use:

setprop ro.product.locale xx-XX
setprop persist.sys.locale xx-XX

xx is language, XX is country

Answer 4

Run through the following steps:

• Create emulator with google APIs Intel x86

• Root the emulator, by running the command:

  adb root
  

• Run the following shell command through adb:

  adb -e shell "su root; setprop persist.sys.locale pt-PT; stop; sleep 2; start” 
  

  then, exit the shell which restarts the emulator.

• Locales we need for screenshots:

  de_DE
  en_EN
  fr_FR
  ko_KO
  pt_PT
  es_ES
  ja_JA
  

Answer 5

The solution for API 28+ is

adb shell am broadcast -a com.android.intent.action.SET_LOCALE --es com.android.intent.extra.LOCALE "en_US" com.android.customlocale2

Answer 6

Your errors have nothing to do with adb. You just lack understanding of how your local shell processes your command. What you are doing is running these commands locally (on your PC):

adb shell setprop persist.sys.language fr
setprop persist.sys.country CA
stop
sleep 5
start

and the error messages you see are from local shell (i.e. there is no setprop executable on your system and start and stop commands have non-optional parameters.

the correct command would be

adb shell "setprop persist.sys.language fr; setprop persist.sys.country CA; setprop ctl.restart zygote"

or in more recent Android versions:

adb shell "setprop persist.sys.locale fr-CA; setprop ctl.restart zygote"