Can we guarantee that Android's SpeechRecognizer does not send data to Google?-CodePudding

I'm trying to implement Android's SpeechRecognizer feature. Due to privacy constraints of my company, the data must explicitly not leave the device.

So far:

I've implemented the SpeechRecognizer class by using the SpeechRecognizer.createSpeechRecognizermethod. When I tried it without internet, it just worked fine! However, there's not guarantee as far as I see that Google won't send the data when online, if not for transcription, then for improving their Audio training data..
SpeechRecognizer.createOnDeviceSpeechRecognizer - This is available from Android 12 and on. Let's say I don't mind. However, it only works in specific devices, ie. Pixel 6 but not even in Pixel 4a.
putExtra(RecognizerIntent.EXTRA_PREFER_OFFLINE, true) - This didn't work either. It keeps giving me the error: ERROR_NO_MATCH, in any device that I've tried.

So that leaves us with plain SpeechRecognizer.createSpeechRecognizer and my implementation is like this:

var recognizerIntent: Intent? = null
        if (SpeechRecognizer.isRecognitionAvailable(applicationContext)) {
            sr = SpeechRecognizer.createSpeechRecognizer(applicationContext)

            val listener = MySpeechRecognitionListener(scopeProvider, lifecycleScope, {
                ...
            }
            sr.setRecognitionListener(listener)
            recognizerIntent = Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH).apply {
                putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_WEB_SEARCH)
            }
            sr.startListening(recognizerIntent)
} else {...}

Question: Can we somehow guarantee that Android's SpeechRecognizer does not send data to Google?

CodePudding user response：

you could ensure that internet connection (wifi, cell network, etc) is disabled during the recognizing however that does not guarantee that the recognized speech isn't recorded/cached and sent to google later when there is a network connection.

CodePudding user response：

Use:

public static SpeechRecognizer createSpeechRecognizer (Context context, 
                ComponentName serviceComponent)

specifying a serviceComponent that is open source, so that you can verify that it does not send data to Google.

I don't see any other solution, i.e. I'm not aware of any Android API flags like DONT_SEND_DATA_TO_GOOGLE.