A float array of confidence scores of the recognition results when performing RecognizerIntent.ActionRecognizeSpeech. The array should be the same size as the ArrayList returned in RecognizerIntent.ExtraResults, and should contain values ranging from 0.0 to 1.0, or -1 to represent an unavailable confidence score.
Confidence values close to 1.0 indicate high confidence (the speech recognizer is confident that the recognition result is correct), while values close to 0.0 indicate low confidence.
Returned in the results; not to be specified in the recognition request. This extra is optional and might not be provided. Only present when Android.App.Activity.RESULT_OK is returned in an activity result.