| SynthesisCallback | A callback to return speech data synthesized by a text to speech engine. | 
| TextToSpeech.OnInitListener | Interface definition of a callback to be invoked indicating the completion of the TextToSpeech engine initialization. | 
| TextToSpeech.OnUtteranceCompletedListener | This interface was deprecated
      in API level 18.
    Use UtteranceProgressListenerinstead. | 
| SynthesisRequest | Contains data required by engines to synthesize speech. | 
| TextToSpeech | Synthesizes speech from text for immediate playback or to create a sound file. | 
| TextToSpeech.Engine | Constants and parameter names for controlling text-to-speech. | 
| TextToSpeech.EngineInfo | Information about an installed text-to-speech engine. | 
| TextToSpeechService | Abstract base class for TTS engine implementations. | 
| UtteranceProgressListener | Listener for events relating to the progress of an utterance through the synthesis queue. | 
| Voice | Characteristics and features of a Text-To-Speech Voice. |