| RecognitionListener | Used for receiving notifications from the SpeechRecognizer when the recognition related events occur. |
| RecognitionService | This class provides a base class for recognition service implementations. |
| RecognitionService.Callback | This class receives callbacks from the speech recognition service and forwards them to the user. |
| RecognizerIntent | Constants for supporting speech recognition through starting an Intent
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| SpeechRecognizer | This class provides access to the speech recognition service. |