How do I prevent an Android device from going to sleep programmatically

Question

User · Answer

If you just want to prevent the sleep mode on a specific View  just call setKeepScreenOn true  on that View or set the keepScreenOn property to true  This will prevent the screen from going off while the View is on the screen  No special permission required for this

User · Answer

what  eldarerathis said is correct in all aspects  the wake lock is the right way of keeping the device from going to sleep   I don t know waht you app needs to do but it is really important that you think on how architect your app so that you don t force the phone to stay awake for more that you need  or the battery life will suffer enormously   I would point you to this really good example on how to use AlarmManager to fire events and wake up the phone and  your app  to perform what you need to do and then go to sleep again  Alarm Manager  source  commonsware com

User · Answer

android keepScreenOn  true  could be better option to have from layout XML   More info  https   developer android com training scheduling wakelock html

User · Answer

I found another working solution  add the following line to your app under the onCreate event   getWindow   addFlags WindowManager LayoutParams FLAG KEEP SCREEN ON     My sample Cordova project looks like this   package com apps demo  import android os Bundle  import android view WindowManager  import org apache cordova     public class ScanManActivity extends DroidGap        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           getWindow   addFlags WindowManager LayoutParams FLAG KEEP SCREEN ON           super loadUrl  http   stackoverflow com              After that  my app would not go to sleep while it was open  Thanks for the anwer goes to xSus

User · Answer

From the root shell  e g  adb shell   you can lock with   echo mylockname  gt  sys power wake lock       After which the device will stay awake  until you do   echo mylockname  gt  sys power wake unlock       With the same string for  mylockname    Note that this will not prevent the screen from going black  but it will prevent the CPU from sleeping   Note that  sys power wake lock is read-write for user radio  1001  and group system  1000   and  of course  root   A reference is here  http   lwn net Articles 479841

User · Answer

One option is to use a wake lock  Example from the docs   PowerManager pm    PowerManager  getSystemService Context POWER SERVICE   PowerManager WakeLock wl   pm newWakeLock PowerManager SCREEN DIM WAKE LOCK   My Tag    wl acquire        screen and CPU will stay awake during this section  wl release      There s also a table on this page that describes the different kinds of wakelocks   Be aware that some caution needs to be taken when using wake locks  Ensure that you always release   the lock when you re done with it  or not in the foreground   Otherwise your app can potentially cause some serious battery drain and CPU usage   The documentation also contains a useful page that describes different approaches to keeping a device awake  and when you might choose to use one  If  prevent device from going to sleep  only refers to the screen  and not keeping the CPU active  then a wake lock is probably more than you need   You also need to be sure you have the WAKE LOCK permission set in your manifest in order to use this method

User · Answer

If you are a Xamarin user  this is the solution      protected override void OnCreate Bundle bundle                base OnCreate bundle     always call superclass first          this Window AddFlags WindowManagerFlags KeepScreenOn            LoadApplication new App

User · Answer

Set flags on Activity s Window as below   Override public void onResume      super onResume     getWindow   addFlags WindowManager LayoutParams FLAG KEEP SCREEN ON       Override public void onPause      super onPause     getWindow   clearFlags WindowManager LayoutParams FLAG KEEP SCREEN ON

[android] How do I prevent an Android device from going to sleep programmatically?

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