Hi there, I tried the background scanning and it works just perfectl

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There is this method to trim scan and rest intervals: <div class="Box Box--con

Disabling background scan when device is locked,about nordicsemiconductor/android-scanner-compat-library

philips77 commented on June 5, 2024 2

Well, that's understandable. Older versions don't have offloaded scanning, they have to run the service and even filter devices using CPU. I would even say, that for long lasting scanning the minimum Android version should be 8, where the option with Pending Intent was added. On older phones it is not possible to have all the features: background scanning, quick responses, filtering, and good battery lifetime.

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ndrjt commented on June 5, 2024

Hi @schlachtzeuger,
I am facing the same issue, even I have used pendingintent for background scan for a while but it scanning for around 30 mins. is there any way to scan continuously for hours and hours?

Thanks.

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philips77 commented on June 5, 2024

I think the design is to prevent the battery from dying. You may have a Task in TaskManager that will start and stop scanning every now and then if you really need to.

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ndrjt commented on June 5, 2024

Yeah, what if I need to scan continuously? And how we can achieve it by library?

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philips77 commented on June 5, 2024

The goal of the library is to mimic the behavior of the latest Android version on older phones. I'm rather thinking of focusing on saving battery for pre-Oreo phones, than on allowing long lasting continuous scan for newer.

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indrajit9 commented on June 5, 2024

Thank you @philips77

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schlachtzeuger commented on June 5, 2024

@ndrjt : After reading my request I'm not sure if I explained my issue comprehensible: My issue is not that it stops after some time but that it literally kills the battery on older Android versions.

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schlachtzeuger commented on June 5, 2024

That's exactly why I was asking if we could throttle background scanning on pre-Oreo devices a bit. Thus we could have some sort of background scanning, maybe with a higher delay but without killing the battery.

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philips77 commented on June 5, 2024

There is this method to trim scan and rest intervals:

Android-Scanner-Compat-Library/scanner/src/main/java/no/nordicsemi/android/support/v18/scanner/ScanSettings.java

Lines 575 to 593 in e56d7f1

    
           		/** 
        
           		 * Pre-Lollipop scanning requires a wakelock and the CPU cannot go to sleep. 
        
           		 * To conserve power we can optionally scan for a certain duration (scan interval) 
        
           		 * and then rest for a time before starting scanning again. Won't affect Lollipop 
        
           		 * or later devices. 
        
           		 * 
        
           		 * @param scanInterval interval in ms to scan at a time. 
        
           		 * @param restInterval interval to sleep for without scanning before scanning again for 
        
           		 *                     scanInterval. 
        
           		 */ 
        
           		@NonNull 
        
           		public Builder setPowerSave(final long scanInterval, final long restInterval) { 
        
           			if (scanInterval <= 0 || restInterval <= 0) { 
        
           				throw new IllegalArgumentException("scanInterval and restInterval must be > 0"); 
        
           			} 
        
           			powerSaveScanInterval = scanInterval; 
        
           			powerSaveRestInterval = restInterval; 
        
           			return this; 
        
           		}

I'm closing the issue due to inactivity. Sorry that it took me so long to reply.

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Disabling background scan when device is locked about android-scanner-compat-library HOT 9 CLOSED

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	/**
	* Pre-Lollipop scanning requires a wakelock and the CPU cannot go to sleep.
	* To conserve power we can optionally scan for a certain duration (scan interval)
	* and then rest for a time before starting scanning again. Won't affect Lollipop
	* or later devices.
	*
	* @param scanInterval interval in ms to scan at a time.
	* @param restInterval interval to sleep for without scanning before scanning again for
	* scanInterval.
	*/
	@NonNull
	public Builder setPowerSave(final long scanInterval, final long restInterval) {
	if (scanInterval <= 0 \|\| restInterval <= 0) {
	throw new IllegalArgumentException("scanInterval and restInterval must be > 0");
	}
	powerSaveScanInterval = scanInterval;
	powerSaveRestInterval = restInterval;
	return this;
	}