IllegalStateException when starting monitoring on SDK 0.9.6

[rafalniski]

Hi,

after update from 0.8.8 to 0.9.6 we were starting getting this exception:

Fatal Exception: java.lang.IllegalStateException: BT Adapter is not turned ON
   at android.bluetooth.le.BluetoothLeUtils.checkAdapterStateOn(BluetoothLeUtils.java:136)
   at android.bluetooth.le.BluetoothLeScanner.startScan(BluetoothLeScanner.java:106)
   at android.bluetooth.le.BluetoothLeScanner.startScan(BluetoothLeScanner.java:101)
   at com.estimote.sdk.service.internal.LollipopBluetoothAdapter.start(LollipopBluetoothAdapter.java:146)
   at com.estimote.sdk.service.internal.LollipopBluetoothAdapter.updateScanSettings(LollipopBluetoothAdapter.java:97)
   at com.estimote.sdk.service.BeaconService.updateScanPeriods(BeaconService.java:453)
   at com.estimote.sdk.service.BeaconService.startScanning(BeaconService.java:415)
   at com.estimote.sdk.service.BeaconService.startMonitoring(BeaconService.java:358)
   at com.estimote.sdk.service.BeaconService.access$500(BeaconService.java:77)
   at com.estimote.sdk.service.BeaconService$IncomingHandler$1.run(BeaconService.java:537)
   at android.os.Handler.handleCallback(Handler.java:739)
   at android.os.Handler.dispatchMessage(Handler.java:95)
   at android.os.Looper.loop(Looper.java:135)
   at android.os.HandlerThread.run(HandlerThread.java:61)

And the code for starting monitoring looks like:

if (SystemRequirementsHelper.isBluetoothLeAvailable(context) && SystemRequirementsHelper.isBluetoothEnabled(context)) {
    beaconManager.startMonitoring(ALL_ESTIMOTE_BEACONS_REGION);
    LOG.debug("monitoring started");
}

Any idea on what is the cause?

[pwittchen]

My guess: something is wrong with SystemRequirementsHelper and isBluetoothEnabled(context) method doesn't work properly and returns true when it shouldn't. Probably it's a bug. You can wait for an update of Estimote SDK or try to solve it yourself. You can try the following code snippet:

public boolean isBluetoothEnabled() {
  BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
  return adapter != null && adapter.isEnabled();
}

I cannot guarantee, it's the right solution and if will work on any device and Android API, but I think it should and you can try.

In the code snippet above, adapter will be null, when a specific device doesn't support Bluetooth.

[Poberro]

Actually it is the new behavior of BluetoothLeScanner that throws an exception when state of BluetoothAdapter is not on (adapter may be enabled but it is not turned on). Old scanning API just returned false, new one crashes an app. It should be fixed in SDK 0.9.7.

[rafalniski]

After upgrade to 0.9.7 the issue still happens:

Fatal Exception: java.lang.IllegalStateException: BT Adapter is not turned ON
   at android.bluetooth.le.BluetoothLeUtils.checkAdapterStateOn(BluetoothLeUtils.java:136)
   at android.bluetooth.le.BluetoothLeScanner.startScan(BluetoothLeScanner.java:106)
   at android.bluetooth.le.BluetoothLeScanner.startScan(BluetoothLeScanner.java:101)
   at com.estimote.sdk.service.internal.LollipopBluetoothAdapter.start(LollipopBluetoothAdapter.java:160)
   at com.estimote.sdk.service.internal.LollipopBluetoothAdapter.updateFilters(LollipopBluetoothAdapter.java:133)
   at com.estimote.sdk.service.BeaconService$1.onRegionsChanged(BeaconService.java:246)
   at com.estimote.sdk.service.internal.RegionObserver.onRegionsChanged(RegionObserver.java:90)
   at com.estimote.sdk.service.internal.RegionObserver.add(RegionObserver.java:51)
   at com.estimote.sdk.service.BeaconService.startMonitoring(BeaconService.java:358)
   at com.estimote.sdk.service.BeaconService.access$600(BeaconService.java:77)
   at com.estimote.sdk.service.BeaconService$IncomingHandler$1.run(BeaconService.java:541)
   at android.os.Handler.handleCallback(Handler.java:739)
   at android.os.Handler.dispatchMessage(Handler.java:95)
   at android.os.Looper.loop(Looper.java:135)
   at android.os.HandlerThread.run(HandlerThread.java:61)