Sweettooth

Sweettooth provides support for voice recognition via Bluetooth headset for Android. It supports both Gingerbread and the post-Honeycomb Bluetooth APIs, abstracting away their differences and the nasty reflection necessary to enable this support on Gingerbread.

Usage is simple- just instantiate the class that corresponds to the version of Android you are on.

    Bluetooth bt;

    if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB) {
        bt = new Gingerbread();
    } else {
        bt = new Honeycomb();
    }

The rest of the setup procedure doesn't change. obtainProxy() will throw an exception if you haven't set the application context.

    bt.setContext(getApplicationContext());
    
    try {
        bt.obtainProxy();
    } catch (Exception e) {
        e.printStackTrace();
    }

To start routing audio from your Bluetooth headset, you have to explictly open a voice recognition channel. This is as simple as calling startVoiceRecognition before activating your SpeechRecognizer.

        if(bt.isAvailable()) {
            bt.startVoiceRecognition();
        }

Sweettooth will fire an Intent, Bluetooth.BLUETOOTH_STATE, when the Bluetooth service responds to your request. Boolean extra "bluetooth_connected" will indicate success or failure to open the channel. Your application should wait for this Intent before proceeeding with speech recognition.

After you have your results, close the channel with stopVoiceRecognition.

        if(bt.isAvailable()) {
            bt.stopVoiceRecognition();
        }

At the end of your Activity, disconnect the proxy by calling releaseProxy().