Android brightness change notification (or status bar roll-up notification)

Question

In Android user can change brightness by "rolling down" the status bar (or notification bar, whatever this is called in Android) and changing brightness there.

I need to display brightness slider in my app. I know how to get system brightness value, but the question is how to know if user changed the brightness? When user rolls-up the notification bar I don't get onResume. How do I know that the brightness has changed or the notification bar revealed my activity to the user?

https://stackoverflow.com/questions/46119279/how-to-detect-if-screen-brightness-has-changed-in-android — user9170, Oct 07 '20 at 14:48

score 3 · Accepted Answer · edited Aug 08 '12 at 11:20

3

Try creating a thread with a runnable that runs indefinitely (or till you want it to run) where you listen for a change in the current brightness. This can be done pretty easily

Find the original screen brightness and assign it to a variable called oldScreenBrightness.

In your thread check

currentScreenBrightness = getCurrentScreenBrightness();
if (oldScreenBrightness != currentScreenBrightness)
{
    doSomething()
    oldScreenBrightness = currentScreenBrightness
}
else
{
   doNothing or doSomethingElse
}

edited Aug 08 '12 at 11:20

Lucifer

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answered Aug 07 '12 at 21:03

Vishwa Patel

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1

my god, is it the only way? when posting my question i was about to write "and please don't tell me i have to resort to polling" :) android is ridiculous :( – Łukasz Sromek Aug 08 '12 at 07:09
I've looked into this issue in the past and after much research I came to the conclusion that this was the only solution. Android is actually pretty amazing but yours in a an extremely niche case I'd say. – Vishwa Patel Aug 08 '12 at 10:15
after two years of programming for iPhone and one year Android I have my own opinion about the latter ;) thanks for the answer, I'll accept it after a few days if nobody comes up with some more event-based solution. – Łukasz Sromek Aug 08 '12 at 10:38
haha very well then, I think I should try out iPhone dev, now only if Objective-C didn't look so messy. – Vishwa Patel Aug 08 '12 at 10:57
yes, I interned there over the last two months. I'm sorry but who are you? – Vishwa Patel Aug 08 '12 at 11:30
Yes, I've just finished my 1st year of Bachelor of Engineering and Computer Science. – Vishwa Patel Aug 17 '12 at 11:14

score -1 · Answer 2 · answered Mar 06 '14 at 10:27

-1

Go to settings Select display Select notification panel Check Brightness adjustment

answered Mar 06 '14 at 10:27

user3387648

1

that's not programing way,just change the setting. – omid Mar 06 '14 at 10:50

Android brightness change notification (or status bar roll-up notification)

2 Answers2