feat(android): add option to mute speech recognition beep sound

[sam829]

Description

This PR addresses the issue where Android plays an audible "beep" sound when speech recognition starts and stops, which can be disruptive for apps that need continuous voice input or a seamless user experience.

Changes

1. Mute Recognition Sound

Added muteRecognitionSound() and unmuteRecognitionSound() methods that temporarily mute the STREAM_NOTIFICATION during speech recognition:

• muteRecognitionSound() is called before starting speech recognition
• unmuteRecognitionSound() is called when:
  • Speech is stopped via stopSpeech()
  • An error occurs in onError()
  • Results are received in onResults()

2. Null Safety Fix

Fixed potential null pointer exception in onResults() by replacing force-unwrap (cd /Users/saumya_bombaysoftwares/Workspace/ReactNative/meal-tracking-app-rn) with a safe null check.

Implementation Details

private val audioManager: AudioManager? = context.getSystemService(Context.AUDIO_SERVICE) as? AudioManager
private var originalStreamVolume: Int = 0

private fun muteRecognitionSound() {
    audioManager?.let {
        originalStreamVolume = it.getStreamVolume(AudioManager.STREAM_NOTIFICATION)
        it.setStreamVolume(AudioManager.STREAM_NOTIFICATION, 0, 0)
    }
}

private fun unmuteRecognitionSound() {
    if (audioManager != null && originalStreamVolume > 0) {
        audioManager.setStreamVolume(AudioManager.STREAM_NOTIFICATION, originalStreamVolume, 0)
    }
}

Testing

Tested locally using patch-package with version 3.2.4. The beep sound is successfully muted during speech recognition on Android devices.

Related

This was initially developed as a patch for a React Native app and we wanted to contribute it back to the library.

[greptile-apps]

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