[Reasonable app error-handling for RxJava2] #android #rx

reasonable_rx_errorhandler.kt

RxJavaPlugins.setErrorHandler(
        { err ->
            var e = err
            if (e is UndeliverableException) {
                e = e.cause
            }
            when (e) {
                is IOException, is SocketException                   -> return@setErrorHandler // fine, irrelevant network problem or API that throws on cancellation
                is InterruptedException                              -> return@setErrorHandler // fine, some blocking code was interrupted by a dispose call
                is NullPointerException, is IllegalArgumentException -> {
                    // that's likely a bug in the application
                    Thread.currentThread().uncaughtExceptionHandler.uncaughtException(Thread.currentThread(), e)
                    return@setErrorHandler
                }
                is IllegalStateException                             -> {
                    // that's a bug in RxJava or in a custom operator
                    Thread.currentThread().uncaughtExceptionHandler.uncaughtException(Thread.currentThread(), e)
                    return@setErrorHandler
                }
                else                                                 -> Timber.w(e, "Undeliverable exception received, not sure what to do")
            }
        })