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I have an audio file (in .m4a / .wav format) stored on the Android device, and I need to transcribe the speech content from it into text.

From my understanding, the built-in SpeechRecognizer API in Android is mainly designed for live speech input via the microphone.

My questions are:

Is it possible to pass an existing audio file into Android’s SpeechRecognizer API to get the transcription?

If not, what would be the recommended way to transcribe pre-recorded audio files on Android?

Are there any open-source projects, libraries, or services that handle this use case (speech-to-text from audio file) directly on Android?

I would prefer solutions that can run on-device, but cloud APIs are also an option if there’s no native way.

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Your android device does not do audio to text conversion itself, it has to connect to a third party service to do this. SpeechRecognizer is for spoken audio not a recording. For that the most promising api is google's speech to text. This uses google's own cloud service to translate audio to text. There is an explancation and a link to a tutorial on this page.

https://cloud.google.com/speech-to-text#transcribe-audio

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Actually I don't want to take audio using Speech Recognizer at first place. I have a setup in which I am taking the audio using mic doing AEC and noise cancellation. So I need to feed this audio to the speech recognizer instead of relying on SpeechRecognizer for the audio. Is there a way I can bypass this and pass audio data directly to speechRecognizer ?
All I can suggest is doing a search for audio to text projects. There is at least one on github called audio-converter-android

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