BriarReportPrimer makes calls that require a Looper on some devices
When handling an exception, BriarReportPrimer calls BluetoothAdapter.getDefaultAdapter(). On some devices, this method throws a RuntimeException if it's called from a thread without a Looper, i.e. a thread that hasn't called Looper.prepare().
It may be possible to avoid the RuntimeException by using AndroidExecutor to call BluetoothAdapter.getDefaultAdapter(), as DroidtoothPlugin does. However, AndroidExecutor uses the UI thread - if that thread threw the original exception and has therefore died, the Callable might never run and BriarReportPrimer would wait forever.
AndroidExecutor used to create its own captive thread with a Looper. We could revert to that design, but a similar problem would occur if the executor's captive thread had died (less likely but still possible). Since AndroidExecutor is used rarely, perhaps it should create a new thread for each call?
04-27 12:28:38.944 23487-23675/org.briarproject E/ACRA: ACRA caught a NoSuchMethodError for org.briarproject java.lang.NoSuchMethodError: java.util.Collections.emptyEnumeration at org.briarproject.lifecycle.LifecycleManagerImpl.startServices(LifecycleManagerImpl.java:80) at org.briarproject.android.BriarService$1.run(BriarService.java:92) 04-27 12:28:39.054 23487-23675/org.briarproject E/ACRA: ACRA failed to capture the error - handing off to native error reporter java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:121) at android.bluetooth.BluetoothAdapter$1.<init>(BluetoothAdapter.java:1128) at android.bluetooth.BluetoothAdapter.<init>(BluetoothAdapter.java:1128) at android.bluetooth.BluetoothAdapter.getDefaultAdapter(BluetoothAdapter.java:455) at org.briarproject.android.util.BriarReportPrimer.primeReport(BriarReportPrimer.java:150) at org.acra.builder.ReportExecutor.execute(ReportExecutor.java:125) at org.acra.builder.ReportBuilder.build(ReportBuilder.java:148) at org.acra.ErrorReporter.uncaughtException(ErrorReporter.java:260) at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:854) at java.lang.ThreadGroup.uncaughtException(ThreadGroup.java:851) 04-27 12:28:39.054 23487-23675/org.briarproject I/ACRA: ACRA is disabled for org.briarproject - forwarding uncaught Exception on to default ExceptionHandler