Android disable screen timeout while app is running

Question

Is there a way to disable the screensaver while my app is running?

The dimming of the screen is what I mean.

What about using `View.setKeepScreenOn()`[link][1]?. I've never used it myself though. [1]: http://developer.android.com/reference/android/view/View.html#setKeepScreenOn%28boolean%29 — dorzey, Nov 16 '10 at 15:30
possible duplicate of [Force Screen On](http://stackoverflow.com/questions/2131948/force-screen-on) — Richard Ev, Aug 29 '11 at 17:40
http://stackoverflow.com/questions/5712849/how-do-i-keep-the-screen-on-in-my-app/24261889#24261889 — Zar E Ahmer, Jun 17 '14 at 11:04

score 186 · Accepted Answer · edited Feb 12 '13 at 09:19

186

You want to use something like this:

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

edited Feb 12 '13 at 09:19

Marcin Orlowski

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answered Nov 16 '10 at 18:02

Ian G. Clifton

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4

this makes it for the running activity or the whole app? – Muhammed Refaat Nov 06 '14 at 11:38
@MayurR.Amipara yeah I think this is the case here – Muhammed Refaat Oct 30 '15 at 16:26
1

If I write this code in Application class onCreate() method then will it work for whole app ? – Jayesh Oct 22 '16 at 09:04
If No then How can I keep whole app screen on by inserting less code instead of adding that line to each of the activity. – Jayesh Oct 22 '16 at 09:18
1

@Jayesh: You can create a baseActivity and write this code in onCreate Method and extend all activity from baseActivity. – maryam Apr 16 '19 at 16:30

score 110 · Answer 2 · answered May 04 '12 at 08:56

110

I used:

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

to disable the screen timeout and

getWindow().clearFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

to re-enable it.

answered May 04 '12 at 08:56

capellone78

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neteinstein · Answer 3 · 2016-02-08T10:55:39.567

97

There is also a XML way that Google recommends:

<LinearLayout
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:keepScreenOn="true">

Check Google Slides - Slide 16.

"Wakelocks are costly if forgotten (...) Consider using android:keepScreenOn to ensure correctness"

edited Feb 08 '16 at 10:55

answered Oct 03 '12 at 10:40

neteinstein

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For the ones who don't have time to read linked pdf: "Wakelocks are costly if forgotten", "Consider using android:keepScreenOn to ensure correctness". – sdf3qrxewqrxeqwxfew3123 Feb 07 '16 at 15:11
2

@lenrok258 Added to the answer ;-) – neteinstein Feb 08 '16 at 10:56
While using `PowerManager.newWakeLock` and `getWindow().addFlags` didn't work for some reason, this did. – Benjamin Basmaci Aug 07 '19 at 07:14
please keep in mind that `getWindow().addFlags` has to be run from within a `context.runOnUiThread` – mxl Aug 31 '20 at 10:41

score 2 · Answer 4 · answered Jul 03 '12 at 17:46

2

In a View, in my case a SurfaceView subclass, you can set the screen on always on. I wanted the screen to stay on while this view was still drawing stuff.

public class MyCoolSurfaceView extends SurfaceView { 
@Override
protected void onAttachedToWindow (){
    super.onAttachedToWindow();
    this.setKeepScreenOn(true);
}

@Override
protected void onDetachedFromWindow(){
    super.onDetachedFromWindow();
    this.setKeepScreenOn(false);
}

answered Jul 03 '12 at 17:46

orkoden

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That is actually more complicated than needed. Just call setKeepsScreenOn(true) anywhere, and the framework will automatically take care of keeping the screen on when your window is being shown. – hackbod Sep 24 '12 at 07:58

score 2 · Answer 5 · edited May 23 '17 at 12:34

2

Its importante to note that these methods all must be run from the UI thread to work. See changing KeepScreenOn from javascript in Android cordova app

edited May 23 '17 at 12:34

Community

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answered Aug 13 '15 at 14:46

user3599945

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score 2 · Answer 6 · edited Jan 28 '17 at 06:51

2

Simple add below line into your MainActivity and your App never turn lights off.

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

edited Jan 28 '17 at 06:51

Behzad

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answered Jan 28 '17 at 05:52

Null Pointer Exception

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score 2 · Answer 7 · answered Jan 10 '20 at 05:23

1.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);is best solution for Native Android.
2. if you want to do with React android application then please use the below code.

@ReactMethod
    public void activate() {
        final Activity activity = getCurrentActivity();
        if (activity != null) {
            activity.runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    activity.getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
                }
            });
        }

    }

score 1 · Answer 8 · answered Jul 18 '12 at 20:05

1

Put this at onStart

    PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
    wakeLock = powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "no sleep");
    wakeLock.acquire();

And this at you manifest

    <uses-permission android:name="android.permission.WAKE_LOCK" />

Don't forget to

wakeLock.release();

at onStop

answered Jul 18 '12 at 20:05

Gonkas

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`PARTIAL_WAKE_LOCK` allows the screen to go off. – Michael Feb 02 '15 at 01:47

score 0 · Answer 9 · answered Oct 03 '12 at 10:45

0

this is the best way to solve this

 getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

answered Oct 03 '12 at 10:45

MBMJ

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why the need for FLAG_FULLSCREEN to answer this question? – Abdul Wasae Nov 15 '16 at 07:55

score 0 · Answer 10 · answered Nov 16 '10 at 15:28

0

This can be done by acquiring a Wake Lock.

I didn't tested it myself, but here is a small tutorial on this.

answered Nov 16 '10 at 15:28

wonne

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No no no. Wake locks are easily misused and can drain the user's battery if not used very carefully. Use `View#setKeepScreenOn` or its xml layout attribute equivalent, `android:keepScreenOn="true"` – adamp Nov 16 '10 at 16:22
5

@adamp: The OP did not indicate whether his app is an activity or a service. An activity should use the mechanism you cite. A service should use a `WakeLock`. – CommonsWare Nov 16 '10 at 16:33
thanks its not a service. its similar to a picture viewer and i just dont want the screen to be dimmed. – clamp Nov 16 '10 at 16:37
@adamp: your mention of `android:keepScreenOn="true"` is the only valid answer for activities in my opinion. Stay away from wakelocks unless absolutely necessary. – pauluss86 Sep 21 '12 at 10:31
Not just Activities but any sort of UI that shows a window. The accepted answer of using the corresponding window flag is equally valid. – adamp Sep 22 '12 at 00:33
Simply setting the keeoScreenOn flag ony prevents the screen from turning off - it doesn't prevent the screen from dimming! – slott Nov 17 '15 at 12:31
This website is no longer accessible. Any answers are best put into the content of your post (even if not your content as you can attribute it to the author) – brianlmerritt Jan 26 '19 at 09:41
The posted link in this answer now leads to a porn site. – Aaron Hayman Oct 31 '19 at 19:14

score 0 · Answer 11 · answered Nov 15 '17 at 11:07

android:keepScreenOn="true"

is the better way to handle this if we want to make any particular screen awake all the time otherwise we have to handle yourself when to enable it and to disable it

https://developer.android.com/training/scheduling/wakelock.html

score 0 · Answer 12 · answered Nov 20 '17 at 13:39

procedure SetSleep(aEnable:Boolean);
var
    vFlags: integer;
begin
    vFlags := TJWindowManager_LayoutParams.JavaClass.FLAG_TURN_SCREEN_ON or
        TJWindowManager_LayoutParams.JavaClass.FLAG_DISMISS_KEYGUARD or
        TJWindowManager_LayoutParams.JavaClass.FLAG_SHOW_WHEN_LOCKED or
        TJWindowManager_LayoutParams.JavaClass.FLAG_KEEP_SCREEN_ON;

    if aEnable then
    begin
      CallInUIThread (   // uses FMX.Helpers.Android
      procedure
      begin
        TAndroidHelper.Activity.getWindow.setFlags (vFlags, vFlags);
      end );
    end
    else
      CallInUIThread (
      procedure
      begin
        TAndroidHelper.Activity.getWindow.clearFlags (vFlags);
      end );
end;

Android disable screen timeout while app is running

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