Android How to turn screen on and off programmatically

Question

Before marking this post as a  duplicate   I am writing this post because no other post holds the solution to the problem   I am trying to turn off the device  then after a few minutes or sensor change  turn it back on   Turn Off Display Tests  I am able to turn off the screen using   params flags    LayoutParams FLAG KEEP SCREEN ON  params screenBrightness   0  getWindow   setAttributes params     I have been unable to turn off the screen using the wl release   method   Turn On Display Test  My first guess  as follows  does not work  Nothing happens  screen remains off   params flags    LayoutParams FLAG KEEP SCREEN ON  params screenBrightness   -1f  getWindow   setAttributes params     I also then tried to use wakelocks  with no success   PowerManager WakeLock wl   pm newWakeLock PowerManager SCREEN BRIGHT WAKE LOCK   tag    wl acquire      Finally I have tried the following  with no result   getWindow   addFlags WindowManager LayoutParams FLAG TURN SCREEN ON     All in all  I don t get any kind of error in the console for any of these methods  My test text  Screen should be on   is on the the screen when I turn on the device using the power button  This shows that the code should have ran  Please only answer if you have tested the code  it seems like many of the functions such as params screenBrightness   -1  do not work as they should according to the sdk

User · Answer

To keep screen on   getWindow   addFlags WindowManager LayoutParams FLAG KEEP SCREEN ON     Back to screen default mode  just clear the flag FLAG KEEP SCREEN ON  getWindow   clearFlags android view WindowManager LayoutParams FLAG KEEP SCREEN ON

User · Answer

Simply add   android keepScreenOn  true     or call   setKeepScreenOn true     on parent view

User · Answer

I have tried all above solution but none worked for me  so I googled and found below solutions  I tried and it worked   https   www tutorialspoint com how-to-turn-android-device-screen-on-and-off-programmatically  if there is any suggestion then please give

User · Answer

I am going to assume you only want this to be in effect while your application is in the foreground   This code   params flags    LayoutParams FLAG KEEP SCREEN ON  params screenBrightness   0  getWindow   setAttributes params     Does not turn the screen off in the traditional sense   It makes the screen as dim as possible   In the standard platform there is a limit to how dim it can be  if your device is actually allowing the screen to turn completely off  then it is some peculiarity of the implementation of that device and not a behavior you can count on across devices   In fact using this in conjunction with FLAG KEEP SCREEN ON means that you will never allow the screen to go off  and thus the device to go into low-power mode  even if the particular device is allowing you to set the screen brightness to full-off   Keep this very strongly in mind   You will be using much more power than you would if the screen was really off   Now for turning the screen back to regular brightness  just setting the brightness value should do it   WindowManager LayoutParams params   getWindow   getAttributes    params screenBrightness   -1  getWindow   setAttributes params     I can t explain why this wouldn t replace the 0 value you had previously set   As a test  you could try putting a forced full brightness in there to force to that specific brightness   WindowManager LayoutParams params   getWindow   getAttributes    params screenBrightness   1  getWindow   setAttributes params     This definitely works   For example  Google s Books apps uses this to allow you to set the screen brightness to dim while using a book and then return to regular brightness when turning that off   To help debug  you can use  adb shell dumpsys window  to see the current state of your window   In the data for your window  it will tell you the current LayoutParams that have been set for it   Ensure the value you think is actually there   And again  FLAG KEEP SCREEN ON is a separate concept  it and the brightness have no direct impact on each other    And there would be no reason to set the flag again when undoing the brightness  if you had already set it when putting the brightness to 0   The flag will stay set until you change it

User · Answer

I wouldn t have hope of  waking the screen  in the activity  If the screen is off the activity is probably in a paused state and shouldn t be running any code   When waking up  there is the issue of the lockscreen  I don t know how any app can automatically bypass the lockscreen   You should consider running your background tasks in a service  and then using the notification manager to send a notification when whatever is detected  The notification should provide some sort of device alert  screen wake up  notification icon  notification led  etc   When clicking the notification it can launch the intent to start your activity   You could also attempt to start the activity direct from the service  but I really don t know if that will turn the screen on or bypass the lockscreen

User · Answer

Regarding to Android documentation it can be achieve by using following code line   getWindow   addFlags WindowManager LayoutParams FLAG KEEP SCREEN ON     I have added this in my onCreate method and it works fine   On the link you will find different ways to achieve this and general explanation as well   Link to the documenation  https   developer android com training scheduling wakelock html

User · Answer

WakeLock screenLock        PowerManager getSystemService POWER SERVICE   newWakeLock      PowerManager SCREEN BRIGHT WAKE LOCK   PowerManager ACQUIRE CAUSES WAKEUP   TAG        screenLock acquire         later   screenLock release        User Manifest file

User · Answer

Are you sure you requested the proper permission in your Manifest file    lt uses-permission android name  android permission WAKE LOCK    gt    You can use the AlarmManager1 class to fire off an intent that starts your activity and acquires the wake lock   This will turn on the screen and keep it on   Releasing the wakelock will allow the device to go to sleep on its own   You can also take a look at using the PowerManager to set the device to sleep  http   developer android com reference android os PowerManager html goToSleep long

User · Answer

As per Android API 28 and above you need to do the following to turn on the screen    setShowWhenLocked true    setTurnScreenOn true    KeyguardManager keyguardManager    KeyguardManager  getSystemService Context KEYGUARD SERVICE   keyguardManager requestDismissKeyguard this  null

User · Answer

The best way to do it   using rooted devices      Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState                          int flags   WindowManager LayoutParams FLAG DISMISS KEYGUARD   WindowManager LayoutParams FLAG SHOW WHEN LOCKED   WindowManager LayoutParams FLAG TURN SCREEN ON      getWindow   addFlags flags      this is how your app will wake up the screen       you will call this activity later                     Now we have this two functions    private void turnOffScreen       try       Class c   Class forName  android os PowerManager         PowerManager  mPowerManager    PowerManager  this getSystemService Context POWER SERVICE        for Method m   c getDeclaredMethods             if m getName   equals  goToSleep               m setAccessible true             if m getParameterTypes   length    1               m invoke mPowerManager SystemClock uptimeMillis  -2                                     catch  Exception e           And this    public void turnOnScreen      Intent i   new Intent this YOURACTIVITYWITHFLAGS class     startActivity i       Sorry for my bad english

User · Answer

I had written this method to turn on the screen after screen lock  It works perfectly for me  Try it-      private void unlockScreen             Window window   this getWindow            window addFlags WindowManager LayoutParams FLAG DISMISS KEYGUARD           window addFlags WindowManager LayoutParams FLAG SHOW WHEN LOCKED           window addFlags WindowManager LayoutParams FLAG TURN SCREEN ON           And call this method from onResume

User · Answer

Hi I hope this will help    private PowerManager mPowerManager   private PowerManager WakeLock mWakeLock    public void turnOnScreen            turn on screen      Log v  ProximityActivity    ON          mWakeLock   mPowerManager newWakeLock PowerManager SCREEN BRIGHT WAKE LOCK   PowerManager ACQUIRE CAUSES WAKEUP   tag         mWakeLock acquire         TargetApi 21    Suppress lint error for PROXIMITY SCREEN OFF WAKE LOCK  public void turnOffScreen            turn off screen      Log v  ProximityActivity    OFF          mWakeLock   mPowerManager newWakeLock PowerManager PROXIMITY SCREEN OFF WAKE LOCK   tag         mWakeLock acquire

User · Answer

This is worked on Marshmallow  private final String TAG    OnOffScreen   private PowerManager  powerManager  private PowerManager WakeLock  screenOffWakeLock   public void turnOnScreen         if   screenOffWakeLock    null             screenOffWakeLock release             public void turnOffScreen         try            powerManager    PowerManager  this getSystemService POWER SERVICE           if   powerManager    null                 screenOffWakeLock    powerManager newWakeLock PROXIMITY SCREEN OFF WAKE LOCK  TAG               if   screenOffWakeLock    null                     screenOffWakeLock acquire                                  catch  Exception ex            ex printStackTrace

User · Answer

Here is a successful example of an implementation of the same thing  on a device which supported lower screen brightness values  I tested on an Allwinner Chinese 7  tablet running API15     WindowManager LayoutParams params   this getWindow   getAttributes         Turn off     params flags   WindowManager LayoutParams FLAG KEEP SCREEN ON    TODO Store original brightness value params screenBrightness   0 1f  this getWindow   setAttributes params        Turn on     params flags   WindowManager LayoutParams FLAG KEEP SCREEN ON    TODO restoring from original value params screenBrightness   0 9f  this getWindow   setAttributes params     If someone else tries this out  pls comment below if it worked didn t work and the device  Android API

User · Answer

I would suggest this one   PowerManager WakeLock wl   pm newWakeLock PowerManager SCREEN BRIGHT WAKE LOCK   PowerManager ACQUIRE CAUSES WAKEUP   tag    wl acquire      The flag ACQUIRE CAUSES WAKEUP is explained like that      Normal wake locks don t actually turn on the illumination  Instead    they cause the illumination to remain on once it turns on  e g  from   user activity   This flag will force the screen and or keyboard to   turn on immediately  when the WakeLock is acquired  A typical use   would be for notifications which are important for the user to see   immediately    Also  make sure you have the following permission in the AndroidManifewst xml file    lt uses-permission android name  android permission WAKE LOCK    gt

User · Answer

If your app is a system app you can use PowerManager goToSleep   to turn screen off you requires a special permission    before you use goToSleep    you need use reflection just like   public static void goToSleep Context context        PowerManager powerManager   PowerManager context getSystemService Context POWER SERVICE       try           powerManager getClass   getMethod  goToSleep   new Class   long class   invoke powerManager  SystemClock uptimeMillis           catch  IllegalAccessException e            e printStackTrace          catch  InvocationTargetException e            e printStackTrace          catch  NoSuchMethodException e            e printStackTrace              Now you can use goToSleep   to turn screen off      This is what happens when the power key is pressed to turn off the screen

[android] Android: How to turn screen on and off programmatically?

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