Update the flutter beacon library and fixed compatibility issues

[MayurPansara]

Hi!

If the flutter_beacon library version 0.5.1 is not working with SDK version 3.24.2, it might be due to compatibility issues or updates needed for the library to support the latest SDK

Thank you for the amazing library!

[kjm0202]

Refer to this workaround for Flutter 3.24+ : flutter/flutter#153281 (comment)

Also, do not upgrade to the latest Kotlin / AGP / Gradle.
I tried those updates, but eventually the whole workspace environment was messed up, so I had to rebuild again.

My last try that DIDN'T work was Kotlin 1.8.22 / Gradle 8.3 / AGP 8.1.0.
Seems to work for debug build, but when in release build, the app just crashed.

Currently I'm using Kotlin 1.8.0 / Gradle 7.5 / AGP 7.4.2 which works fine for now even in release build.

The developer seems to end the support for this library.
Hope other dev would fork this and maintain...

[HadenHiles]

@kjm0202 was the error you got when the app crashes something similar to what I'm experiencing?

My app keeps crashing with a NullPointerException ever since updating to latest flutter and gradle implementation.

I/BluetoothAdapter(10889): BluetoothAdapter() : com.groupofseven.g7trailapp
E/RangedBeacon(10889): Could not construct RssiFilterImplClass org.altbeacon.beacon.service.RunningAverageRssiFilter
E/AndroidRuntime(10889): FATAL EXCEPTION: pool-20-thread-3
E/AndroidRuntime(10889): Process: com.groupofseven.g7trailapp, PID: 10889
E/AndroidRuntime(10889): java.lang.NullPointerException: Attempt to invoke interface method 'void org.altbeacon.beacon.service.RssiFilter.addMeasurement(java.lang.Integer)' on a null object reference
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangedBeacon.addMeasurement(RangedBeacon.java:79)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangedBeacon.updateBeacon(RangedBeacon.java:39)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangedBeacon.<init>(RangedBeacon.java:29)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangeState.addBeacon(RangeState.java:61)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.ScanHelper.processBeaconFromScan(ScanHelper.java:372)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.ScanHelper.access$200(ScanHelper.java:61)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.ScanHelper$ScanProcessorRunnable.run(ScanHelper.java:455)
E/AndroidRuntime(10889): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
E/AndroidRuntime(10889): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
E/AndroidRuntime(10889): 	at java.lang.Thread.run(Thread.java:1012)
I/Process (10889): Sending signal. PID: 10889 SIG: 9
Lost connection to device.

[kjm0202]

@kjm0202 was the error you got when the app crashes something similar to what I'm experiencing?

My app keeps crashing with a NullPointerException ever since updating to latest flutter and gradle implementation.

I/BluetoothAdapter(10889): BluetoothAdapter() : com.groupofseven.g7trailapp
E/RangedBeacon(10889): Could not construct RssiFilterImplClass org.altbeacon.beacon.service.RunningAverageRssiFilter
E/AndroidRuntime(10889): FATAL EXCEPTION: pool-20-thread-3
E/AndroidRuntime(10889): Process: com.groupofseven.g7trailapp, PID: 10889
E/AndroidRuntime(10889): java.lang.NullPointerException: Attempt to invoke interface method 'void org.altbeacon.beacon.service.RssiFilter.addMeasurement(java.lang.Integer)' on a null object reference
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangedBeacon.addMeasurement(RangedBeacon.java:79)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangedBeacon.updateBeacon(RangedBeacon.java:39)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangedBeacon.<init>(RangedBeacon.java:29)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.RangeState.addBeacon(RangeState.java:61)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.ScanHelper.processBeaconFromScan(ScanHelper.java:372)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.ScanHelper.access$200(ScanHelper.java:61)
E/AndroidRuntime(10889): 	at org.altbeacon.beacon.service.ScanHelper$ScanProcessorRunnable.run(ScanHelper.java:455)
E/AndroidRuntime(10889): 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
E/AndroidRuntime(10889): 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:644)
E/AndroidRuntime(10889): 	at java.lang.Thread.run(Thread.java:1012)
I/Process (10889): Sending signal. PID: 10889 SIG: 9
Lost connection to device.

I couldn't remember 100% of the log, but yeah, I'd also seen NullPointException error.
Latest Flutter just works fine with the workaround above, so I think Gradle/Kotlin version would be the problem for that log.

[dariocavada]

Try the updated version of this library, now ported to Kotlin with support for Flutter 3.x, Gradle, and an improved example:
https://pub.dev/packages/dchs_flutter_beacon

[pnkmem429]

Try the updated version of this library, now ported to Kotlin with support for Flutter 3.x, Gradle, and an improved example: https://pub.dev/packages/dchs_flutter_beacon

Thanks for your hard work! Did you also fix the build problem related to androidSdk > 31 in Flutter 3.24+? I'm eager to migrate your plugin.

[dariocavada]

Yes, it resolves the build problem in Flutter 3.23+ when compiling for Android SDK 34.

The migration process is quite simple:

1. Add the new package to your pubspec.yaml file:

   dchs_flutter_beacon: ^0.6.4

2. Update your imports to use the new package:

   import 'package:dchs_flutter_beacon/dchs_flutter_beacon.dart';

Everything else remains the same.

Additionally, I added the following code to improve beacon persistence in the list:

await flutterBeacon.setScanPeriod(1000);
await flutterBeacon.setBetweenScanPeriod(500);
await flutterBeacon.setUseTrackingCache(true);
await flutterBeacon.setMaxTrackingAge(10000);

await flutterBeacon.setBackgroundScanPeriod(1000);
await flutterBeacon.setBackgroundBetweenScanPeriod(500);

This is the first version of the porting. If you encounter any issues, please report them.

[guillempuche]

@dariocavada, fantastic Dario!

We had some crashes in production. Let's see if with your fix they're solved.