Android Question How to turn off the screen(SCREEN_OFF)?

[20353841]

How to turn the back screen power off?I only searched the forum about detecting SCREEN_ OFF.

 

[20353841]

I means shutdown back light power off, and application running also.

 

[peacemaker]

Search for "WAKE_LOCK", PhoneWakeState

AddPermission(android.permission.WAKE_LOCK)

 

[20353841]

Search for "WAKE_LOCK", PhoneWakeState

AddPermission(android.permission.WAKE_LOCK)

I have tried, but I can't find it. All I find are SCREEN_OFF event listener.

 

[peacemaker]

If you talk about the programmatic screen off like by the hardware switch - it's impossible, IMHO.
PhoneWakeState is about switching off the backlight variant.

 

[20353841]

If you talk about the programmatic screen off like by the hardware switch - it's impossible, IMHO.
PhoneWakeState is about switching off the backlight variant.

So I can not turn screen power off?

 

[Erel]

No. You cannot turn off the screen programatically.

 

[peacemaker]

can not turn screen power off

Recent years and Android versions Google has limited the programmatic actions that may concern the security, private data access and so on.
It's easy to imagine: if some action is dangerous to "hack" the phone (switch on-off, delete info, send SPAM, discharge battery...) - it's already forbidden on non-rooted device, and impossible

 

[amer bashar]

No. You cannot turn off the screen programatically.

How could apps like whatsapp and telegram lock (or turn off) the display when putting the phone at the ear to hear from the internal speaker?

 

[peacemaker]

when putting the phone at the ear

It's just system proximity sensor work during call is active.

 

[amer bashar]

It's just system proximity sensor work during call is active.

thanks for your replay..
do you know how to activate that in b4a please?

 

[peacemaker]

Firstly for any question - just try to search the forum for the key words, like "proximity sensor".
And also Google search engine can help.

 

[amer bashar]

Firstly for any question - just try to search the forum for the key words, like "proximity sensor".
And also Google search engine can help.

oh sure I already tried for 2 days so far, the "proximity sensor" is a sensor so its read not write, I mean you can find out if the user put the phone to his ear but you need some code to lock the display

 

[GJREDITOR]

oh sure I already tried for 2 days so far, the "proximity sensor" is a sensor so its read not write, I mean you can find out if the user put the phone to his ear but you need some code to lock the display

You may have to use device-administrator-library: https://www.b4x.com/android/forum/threads/device-administrator-library.19208/ Lock Screen app in Play Store too uses the administrator library:

If you need to change the Screen brightness alone, you can check : https://www.b4x.com/android/forum/threads/change-brightness-without-permissions.148162/#post-939122