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In addition to the Pico TTS engine that comes with Android, I have another TTS engine installed. I can change which is the default used by the system — manually:
Settings > Voice input & output > Text-to-speech settings > Default Engine
I would like to be able to do that programmatically, from within my application. Is this possible?
If so, how would I go about that?
You can’t change the default engine. You can however, change the engine you are using by calling TextToSpeech.setEngineByPackageName() (available since 2.2) or use the constructor that takes an engine package parameter (available in ICS, so not really useful right now).
There is also no API before ICS to find out what engines are installed, so you need to know the other engine’s package beforehand to be able to use it.