[SOLVED] FPS drop on Android when moving finger around the screen (legacy)

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#1

I’m experiencing HUGE fps drop on Android devices when I begin moving finger around the screen (it might be related to MOUSE_MOVE event I guess but I’m not adding any listeners). The moment I stop moving my finger fps changes to 60, mouseChildren, mouseEnabled and cacheAsBitmap doesn’t seem to change anything. I’m using newest openfl (legacy) and lime.
On Xperia Neo V fps drop is visible after adding 25 sprites, on galaxy s3 after 250.

for (i in 0...50)
{
	var a = new Sprite();
	addChild(a);
	var rect:Sprite = new Sprite();
	a.addChild(rect);
	rect.graphics.lineStyle(3, 0x0D7923, 1);
	rect.graphics.drawRoundRect(0, 0, 50, 50, 10);
	a.mouseChildren = a.mouseEnabled = false;
	a.cacheAsBitmap = true;
	a.x = Std.random(stage.stageWidth);
	a.y = Std.random(stage.stageHeight);
}
this.mouseChildren = this.mouseEnabled = false;
addChild(new FPS(10, 40, 0xFF0000));

Adding bitmap instead of drawing round rect has the same effect.

Same problem on pirate pig example, the moment I begin moving my finger fps drops from 60 to 30 and if I set max fps to 30 it drops to 20-25 : ( It’s really weird because I’ve been using openfl for some time now and I have never noticed this.

#2

I’ve seen similar drops before on Android devices, just in general, I think some hardware does this :frowning:

#3

Yeah, it’s really weird, I’m not noticing fps drop on xperia tipo which is weaker than xperia neo v. I guess I’ll ignore this for now :slight_smile: Hopefully only few devices behave like this.

#4

It’s known bug of older android phones - you must put Thread.sleep() inside onTouch handler.
That how I “fix” this in my android game:

@hcwdikk can you try to put

try {
    Thread.sleep((Build.VERSION.SDK_INT < 8) ? 16 : 1);
} catch (InterruptedException e) {
}

just before return true in onTouch handler in SDLActivity.java ?
https://github.com/openfl/lime/blob/master/templates/android/template/src/org/libsdl/app/SDLActivity.java#L1227

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#5

or if you use legacy, look at the legacy templates folder for the “GameActivity”, I think

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#6

I guess it worked, fps now drops to 45-50 instead of 30 :slight_smile: Thanks a lot.

edit: Bigger sleep value decreases fps drop even more.
Also if anyone else would like to add restorer’s fix, onTouchEvent function is located in MainView.java in legacy template folder.

#7

Glad to hear that it helps :success:

Just sent a PR:

#8

Pulled, please let me know, everyone, if you experience any other side-effects from this, such as delayed events of other types, or conflicts with native extensions. In general, dispatching less touch events does seem like the fix here, though