On my Samsung Galaxy S7 I can start camera application and then if I say "take picture" (in Russian) it automatically presses shutter button.

Who does this? Camera application itself?

Where I can know full list of voice commands? Can I start video recording by voice?


Each app can define voice commands it supports. Then whichever voice assistant you use will take care of matching your voice command to each app's intent. Eg see https://developers.google.com/voice-actions on how to register voice commands with the Google voice assistant.

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