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dews
Inspiring
Sep 1, 2017 12:15 AM UTC
Question

Black screen on Android when returning from sleep

I found a few posts - most quite old - this one appeared to have resolved the issue for some:

https://forum.starling-framework.org/topic/air-18-black-screen-after-standby-on-android#post-82165

Nothing worked for me - I did figure out a workaround though:

Add a listener in your main Context:

NativeApplication.nativeApplication.addEventListener(flash.events.Event.ACTIVATE , activateHandler);

In the handler - add a dummy object like a button to the stage (you can set its alpha to 0) then simply remove it after a quarter second.  The removal of the object appears to kick the display back on.  Note, if you try to remove the object too quickly, the display will stay black.

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    8 replies

    fullflash
    Known Participant
    Mar 22, 2018 3:25 PM UTC

    doing  if(stage) stage.quality = stage.quality, onActivate event does fix this issue.

    weird after more than 1 year still not fixed by adobe air

    we encounter this issue only on Android 8 Oreo

    but the workaround still works thanks !

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      mohammado59081064
      mohammado59081064
      Participant
      Aug 27, 2018 10:18 PM UTC

      i have tried all the solutions up there and no one solve me the issue, i am still getting black screen when back from sleep state at Samsung Galaxy S8, here is my ACTIVATE code:

      private function AppActiveHandler(e:Event):void

      {

      if(game_ != null)

      {

      game_.AppActiveHandler();

      }

      if(starling_ != null)

      {

      starling_.start();

      }

      // sometimes after activating the app (in very rare cases) the render is stopped

      // this is the workaround to avoid this scenario.

      if (nativeStage_ != null)

      {

      //var quality:String = nativeStage_.quality;

      nativeStage_.quality = StageQuality.BEST

      var q:Quad = new Quad(starling_.stage.width, starling_.stage.height);

      q.x = 0;

      q.y = 0;

      starling_.stage.addChild(q);

      Starling.juggler.delayCall(function ():void

      {

      starling_.stage.removeChild(q);

      }, 0.25);

      }

      }

      please suggest how should i solve this issue?

      thanks.

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      Colin Holgate
      Colin Holgate
      Inspiring
      Aug 28, 2018 12:00 AM UTC

      There may be some things worth trying mentioned in this discussion:

      context lost « Starling Forum

      Check what Daniel suggests.

      If things are still bad, and especially if you can make a demo file for them to check, you could raise an issue in GitHub:

      GitHub - Gamua/Starling-Framework: The Cross Platform Game Engine 

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      Colin Holgate
      Colin Holgate
      Inspiring
      Sep 1, 2017 12:32 AM UTC

      I can imagine cases where setting the stage quality to what it already is, might not do anything. On deactivate I do:

      stage.quality = "low";

      and on activate:

      stage.quality = "medium";

      Now, if you're entirely using Stage3D you can get away with a stage quality of "low", so you could do the reverse of what I do.

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      dewsAuthor
      Inspiring
      Sep 1, 2017 12:41 AM UTC

      This was the answer I found in the old posts - but it didn't work for me - only adding and removing an object fixed the issue.

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      Colin Holgate
      Colin Holgate
      Inspiring
      Sep 1, 2017 12:44 AM UTC

      The post you linked to did a stage.quality = stage.quality, which is different to the way I do it.

      Then again, I'm doing a lot of display list things, so that might be why it works for me.

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