Nuance mobile sdk: "There appears to be a lot of background noise"

After starting the listener a couple of times I only get "There appears to be a lot of background no开发者_开发技巧ise" errors, in a totally quiet environment that is.

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It turned out that the listening method was called twice and the demo code didn't handle this nicely. it worked after adding this to the official code:

if (transactionState == TS_RECORDING) { return; }