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Verwenden des Android RecognizerIntent mit einem Bluetooth-Headset

Ich verwende den folgenden Code, um die Spracherkennung in Android zu starten:

PackageManager pm = getPackageManager();
List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);

if (activities.size() == 0) {
    displayWarning("This device does not support speech recognition");
    return;
}

Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);

startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);

Das funktioniert gut. Es scheint jedoch keine Spracheingabe von einem Bluetooth-Headset zu akzeptieren, das mit dem Profil "Telefon-Audio" gekoppelt und verbunden ist.

Ich kann eine App namens SoundAbout verwenden, um "Media Audio" auf "Bluetooth (Mono) (SCO)" zu setzen. Mit diesem App-Set funktioniert meine Spracherkennung jetzt, indem ich meine Spracheingabe von meinem Headset aus übernehme.

Wie kann ich RecognizerIntent verwenden und Spracheingaben von einem Bluetooth-Headset erhalten?

Ich sehe in API-Ebene 16 eine neue beabsichtigte Aktion ACTION_VOICE_SEARCH_HANDS_FREE . Dies ist zu neu für mich, aber würde dies mein Problem lösen?

Muss ich im AudioManager herumspielen (wie ich vermute, dass SoundAbout dies tut), um die Audioeingabe mit setBluetoothScoOn () oder startBluetoothSco () zu routen? 

23
Michael Levy

Manifest Erlaubnis 

<uses-permission Android:name="Android.permission.BLUETOOTH" />
<uses-permission Android:name="Android.permission.BROADCAST_STICKY" />
<uses-permission Android:name="Android.permission.MODIFY_AUDIO_SETTINGS" />  

Erstellen Sie eine innere Klasse BluetoothHelper extends BluetoothHeadSetUtils in Ihrer Activity oder Service. Deklarieren Sie einen Klassenmitglied mBluetoothHelper und instanziieren Sie ihn in onCreate() 

BluetoothHelper mBluetoothHelper;

@Override
public void onCreate()
{ 
     mBluetoothHelper = new BluetoothHelper(this);
}  

@Override
onResume()
{ 
    mBluetoothHelper.start();
}

@Override
onPause()
{
    mBluetoothHelper.stop();
}

// inner class
// BluetoothHeadsetUtils is an abstract class that has
// 4 abstracts methods that need to be implemented.
private class BluetoothHelper extends BluetoothHeadSetUtils
{
    public BluetoothHelper(Context context)
    {
        super(context);
    }

    @Override
    public void onScoAudioDisconnected()
    {
        // Cancel speech recognizer if desired
    }

    @Override
    public void onScoAudioConnected()
    {           
        // Should start speech recognition here if not already started  
    }

    @Override
    public void onHeadsetDisconnected()
    {

    }

    @Override
    public void onHeadsetConnected()
    {

    }
}

Um ein Bluetooth-Headset mit Text To Speech verwenden zu können, müssen Sie den AudioManager auf STREAM_VOICE_CALL setzen, bevor Sie sprechen sprechen. Oder verwenden Sie den untenstehenden Code 

protected void speak(String text)
{

    HashMap<String, String> myHashRender = new HashMap<String, String>();

    if (mBluetoothHelper.isOnHeadsetSco())
    {
        myHashRender.put(TextToSpeech.Engine.KEY_PARAM_STREAM, 
            String.valueOf(AudioManager.STREAM_VOICE_CALL));
    }
    mTts.speak(text, TextToSpeech.QUEUE_FLUSH, myHashRender);
}

Kopieren Sie die BluetoothHeadsetUtils-Klasse in Ihr Projekt. 

import Java.util.List;

import Android.annotation.SuppressLint;
import Android.bluetooth.BluetoothAdapter;
import Android.bluetooth.BluetoothClass;
import Android.bluetooth.BluetoothDevice;
import Android.bluetooth.BluetoothHeadset;
import Android.bluetooth.BluetoothProfile;
import Android.content.BroadcastReceiver;
import Android.content.Context;
import Android.content.Intent;
import Android.content.IntentFilter;
import Android.media.AudioManager;
import Android.os.Build;
import Android.os.CountDownTimer;
import Android.util.Log;

/**
 * This is a utility to detect bluetooth headset connection and establish audio connection
 * for Android API >= 8. This includes a work around for  API < 11 to detect already connected headset
 * before the application starts. This work around would only fails if Sco audio
 * connection is accepted but the connected device is not a headset.
 * 
 * @author Hoan Nguyen
 *
 */
public abstract class BluetoothHeadsetUtils
{
    private  Context mContext;

    private BluetoothAdapter mBluetoothAdapter;
    private BluetoothHeadset mBluetoothHeadset;
    private BluetoothDevice mConnectedHeadset;

    private AudioManager mAudioManager;

    private boolean mIsCountDownOn;
    private boolean mIsStarting;
    private boolean mIsOnHeadsetSco;
    private boolean mIsStarted;

    private static final String TAG = "BluetoothHeadsetUtils"; //$NON-NLS-1$

    /**
     * Constructor
     * @param context
     */
    public BluetoothHeadsetUtils(Context context)
    {
        mContext = context;
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
    }

    /**
     * Call this to start BluetoothHeadsetUtils functionalities.
     * @return  The return value of startBluetooth() or startBluetooth11()
     */
    public boolean start()
    {
        if (!mIsStarted)
        {
            mIsStarted = true;

            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
            {
                mIsStarted = startBluetooth();
            }
            else
            {
                mIsStarted = startBluetooth11();
            }
        }

        return mIsStarted;
    }

    /**
     * Should call this on onResume or onDestroy.
     * Unregister broadcast receivers and stop Sco audio connection
     * and cancel count down.
     */
    public void stop()
    {
        if (mIsStarted)
        {
            mIsStarted = false;

            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
            {
                stopBluetooth();
            }
            else
            {
                stopBluetooth11();
            }
        }
    }

    /**
     * 
     * @return  true if audio is connected through headset.
     */
    public boolean isOnHeadsetSco()
    {
        return mIsOnHeadsetSco;
    }

    public abstract void onHeadsetDisconnected();

    public abstract void onHeadsetConnected();

    public abstract void onScoAudioDisconnected();

    public abstract void onScoAudioConnected();

    /**
     * Register for bluetooth headset connection states and Sco audio states.
     * Try to connect to bluetooth headset audio by calling startBluetoothSco(). 
     * This is a work around for API < 11 to detect if a headset is connected before 
     * the application starts.
     * 
     * The official documentation for startBluetoothSco() states
     * 
     * "This method can be used by applications wanting to send and received audio to/from 
     *  a bluetooth SCO headset while the phone is not in call."
     *  
     * Does this mean that startBluetoothSco() would fail if the connected bluetooth device
     * is not a headset?
     * 
     * Thus if a call to startBluetoothSco() is successful, i.e mBroadcastReceiver will receive
     * an ACTION_SCO_AUDIO_STATE_CHANGED with intent extra SCO_AUDIO_STATE_CONNECTED, then
     * we assume that a headset is connected.
     * 
     * @return  false if device does not support bluetooth or current platform does not supports
     *                use of SCO for off call.
     */
    @SuppressWarnings("deprecation")
    private boolean startBluetooth()
    {
        Log.d(TAG, "startBluetooth"); //$NON-NLS-1$

        // Device support bluetooth
        if (mBluetoothAdapter != null)
        {       
            if (mAudioManager.isBluetoothScoAvailableOffCall())
            {
                mContext.registerReceiver(mBroadcastReceiver, 
                                        new IntentFilter(BluetoothDevice.ACTION_ACL_CONNECTED));
                mContext.registerReceiver(mBroadcastReceiver, 
                                        new IntentFilter(BluetoothDevice.ACTION_ACL_DISCONNECTED));
                mContext.registerReceiver(mBroadcastReceiver, 
                                        new IntentFilter(AudioManager.ACTION_SCO_AUDIO_STATE_CHANGED));

                // Need to set audio mode to MODE_IN_CALL for call to startBluetoothSco() to succeed.
                mAudioManager.setMode(AudioManager.MODE_IN_CALL);

                mIsCountDownOn = true;
                // mCountDown repeatedly tries to start bluetooth Sco audio connection.
                mCountDown.start();

                // need for audio sco, see mBroadcastReceiver
                mIsStarting = true;

                return true;
            }
        }

        return false;
    }

    /**
     * Register a headset profile listener
     * @return false    if device does not support bluetooth or current platform does not supports
     *                  use of SCO for off call or error in getting profile proxy.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    private boolean startBluetooth11()
    {
        Log.d(TAG, "startBluetooth11"); //$NON-NLS-1$

        // Device support bluetooth
        if (mBluetoothAdapter != null)
        {
            if (mAudioManager.isBluetoothScoAvailableOffCall())
            {
                // All the detection and audio connection are done in mHeadsetProfileListener
                if (mBluetoothAdapter.getProfileProxy(mContext, 
                                                    mHeadsetProfileListener, 
                                                    BluetoothProfile.HEADSET))
                {
                    return true;
                }
            }
        }

        return false;
    }

    /**
     * API < 11
     * Unregister broadcast receivers and stop Sco audio connection
     * and cancel count down.
     */
    private void stopBluetooth()
    {
        Log.d(TAG, "stopBluetooth"); //$NON-NLS-1$

        if (mIsCountDownOn)
        {
            mIsCountDownOn = false;
            mCountDown.cancel();
        }

        // Need to stop Sco audio connection here when the app
        // change orientation or close with headset still turns on.
        mContext.unregisterReceiver(mBroadcastReceiver);
        mAudioManager.stopBluetoothSco();
        mAudioManager.setMode(AudioManager.MODE_NORMAL);
    }

    /**
     * API >= 11
     * Unregister broadcast receivers and stop Sco audio connection
     * and cancel count down.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    protected void stopBluetooth11()
    {
        Log.d(TAG, "stopBluetooth11"); //$NON-NLS-1$

        if (mIsCountDownOn)
        {
            mIsCountDownOn = false;
            mCountDown11.cancel();
        }

        if (mBluetoothHeadset != null)
        {
            // Need to call stopVoiceRecognition here when the app
            // change orientation or close with headset still turns on.
            mBluetoothHeadset.stopVoiceRecognition(mConnectedHeadset);
            mContext.unregisterReceiver(mHeadsetBroadcastReceiver);
            mBluetoothAdapter.closeProfileProxy(BluetoothProfile.HEADSET, mBluetoothHeadset);
            mBluetoothHeadset = null;
        }
    }

    /**
     * Broadcast receiver for API < 11
     * Handle headset and Sco audio connection states.
     */
    private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver()
    {
        @SuppressWarnings({"deprecation", "synthetic-access"})
        @Override
        public void onReceive(Context context, Intent intent)
        {
            String action = intent.getAction();

            if (action.equals(BluetoothDevice.ACTION_ACL_CONNECTED))
            {       
                mConnectedHeadset = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
                BluetoothClass bluetoothClass = mConnectedHeadset.getBluetoothClass();
                if (bluetoothClass != null)
                {
                    // Check if device is a headset. Besides the 2 below, are there other 
                    // device classes also qualified as headset?
                    int deviceClass = bluetoothClass.getDeviceClass();
                    if (deviceClass == BluetoothClass.Device.AUDIO_VIDEO_HANDSFREE 
                        || deviceClass == BluetoothClass.Device.AUDIO_VIDEO_WEARABLE_HEADSET)
                    {
                        // start bluetooth Sco audio connection.
                        // Calling startBluetoothSco() always returns faIL here, 
                        // that why a count down timer is implemented to call
                        // startBluetoothSco() in the onTick.
                        mAudioManager.setMode(AudioManager.MODE_IN_CALL);
                        mIsCountDownOn = true;
                        mCountDown.start();

                        // override this if you want to do other thing when the device is connected.
                        onHeadsetConnected();
                    }
                }

                Log.d(TAG, mConnectedHeadset.getName() + " connected"); //$NON-NLS-1$
            }
            else if (action.equals(BluetoothDevice.ACTION_ACL_DISCONNECTED))
            {
                Log.d(TAG, "Headset disconnected"); //$NON-NLS-1$

                if (mIsCountDownOn)
                {
                    mIsCountDownOn = false;
                    mCountDown.cancel();
                }

                mAudioManager.setMode(AudioManager.MODE_NORMAL);

                // override this if you want to do other thing when the device is disconnected.
                onHeadsetDisconnected();
            }
            else if (action.equals(AudioManager.ACTION_SCO_AUDIO_STATE_CHANGED))
            {
                int state = intent.getIntExtra(AudioManager.EXTRA_SCO_AUDIO_STATE, 
                                                AudioManager.SCO_AUDIO_STATE_ERROR);

                if (state == AudioManager.SCO_AUDIO_STATE_CONNECTED)
                {
                    mIsOnHeadsetSco = true;

                    if (mIsStarting)
                    {
                        // When the device is connected before the application starts,
                        // ACTION_ACL_CONNECTED will not be received, so call onHeadsetConnected here
                        mIsStarting = false;
                        onHeadsetConnected();
                    }

                    if (mIsCountDownOn)
                    {
                        mIsCountDownOn = false;
                        mCountDown.cancel();
                    }

                    // override this if you want to do other thing when Sco audio is connected.
                    onScoAudioConnected();

                    Log.d(TAG, "Sco connected"); //$NON-NLS-1$
                }
                else if (state == AudioManager.SCO_AUDIO_STATE_DISCONNECTED)
                {
                    Log.d(TAG, "Sco disconnected"); //$NON-NLS-1$

                    // Always receive SCO_AUDIO_STATE_DISCONNECTED on call to startBluetooth()
                    // which at that stage we do not want to do anything. Thus the if condition.
                    if (!mIsStarting)
                    {
                        mIsOnHeadsetSco = false;

                        // Need to call stopBluetoothSco(), otherwise startBluetoothSco()
                        // will not be successful.
                        mAudioManager.stopBluetoothSco();

                        // override this if you want to do other thing when Sco audio is disconnected.
                        onScoAudioDisconnected();
                    } 
                }
            }
        }
    };

    /**
     * API < 11
     * Try to connect to audio headset in onTick.
     */
    private CountDownTimer mCountDown = new CountDownTimer(10000, 1000)
    {

        @SuppressWarnings("synthetic-access")
        @Override
        public void onTick(long millisUntilFinished)
        {
            // When this call is successful, this count down timer will be canceled.
            mAudioManager.startBluetoothSco();

            Log.d(TAG, "\nonTick start bluetooth Sco"); //$NON-NLS-1$
        }

        @SuppressWarnings("synthetic-access")
        @Override
        public void onFinish()
        {
            // Calls to startBluetoothSco() in onStick are not successful.
            // Should implement something to inform user of this failure
            mIsCountDownOn = false;
            mAudioManager.setMode(AudioManager.MODE_NORMAL);

            Log.d(TAG, "\nonFinish fail to connect to headset audio"); //$NON-NLS-1$
        }
    };

    /**
     * API >= 11
     * Check for already connected headset and if so start audio connection.
     * Register for broadcast of headset and Sco audio connection states.
     */
    private BluetoothProfile.ServiceListener mHeadsetProfileListener = new BluetoothProfile.ServiceListener()
    {

        /**
         * This method is never called, even when we closeProfileProxy on onPause.
         * When or will it ever be called???
         */
        @Override
        public void onServiceDisconnected(int profile)
        {
            Log.d(TAG, "Profile listener onServiceDisconnected"); //$NON-NLS-1$
            stopBluetooth11();
        }

        @SuppressWarnings("synthetic-access")
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        @Override
        public void onServiceConnected(int profile, BluetoothProfile proxy)
        {
            Log.d(TAG, "Profile listener onServiceConnected"); //$NON-NLS-1$

            // mBluetoothHeadset is just a headset profile, 
            // it does not represent a headset device.
            mBluetoothHeadset = (BluetoothHeadset) proxy;

            // If a headset is connected before this application starts,
            // ACTION_CONNECTION_STATE_CHANGED will not be broadcast. 
            // So we need to check for already connected headset.
            List<BluetoothDevice> devices = mBluetoothHeadset.getConnectedDevices();
            if (devices.size() > 0)
            {
                // Only one headset can be connected at a time, 
                // so the connected headset is at index 0.
                mConnectedHeadset = devices.get(0);

                onHeadsetConnected();

                // Should not need count down timer, but just in case.
                // See comment below in mHeadsetBroadcastReceiver onReceive()
                mIsCountDownOn = true;
                mCountDown11.start();

                Log.d(TAG, "Start count down"); //$NON-NLS-1$
            }

            // During the active life time of the app, a user may turn on and off the headset.
            // So register for broadcast of connection states.
            mContext.registerReceiver(mHeadsetBroadcastReceiver, 
                            new IntentFilter(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED));
            // Calling startVoiceRecognition does not result in immediate audio connection.
            // So register for broadcast of audio connection states. This broadcast will
            // only be sent if startVoiceRecognition returns true.
            mContext.registerReceiver(mHeadsetBroadcastReceiver, 
                            new IntentFilter(BluetoothHeadset.ACTION_AUDIO_STATE_CHANGED));
        }
    };

    /**
     *  API >= 11
     *  Handle headset and Sco audio connection states.
     */
    private BroadcastReceiver mHeadsetBroadcastReceiver = new BroadcastReceiver()
    {

        @SuppressWarnings("synthetic-access")
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        @Override
        public void onReceive(Context context, Intent intent)
        {
            String action = intent.getAction();
            int state;
            if (action.equals(BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED))
            {
                state = intent.getIntExtra(BluetoothHeadset.EXTRA_STATE, 
                                            BluetoothHeadset.STATE_DISCONNECTED);
                Log.d(TAG, "\nAction = " + action + "\nState = " + state); //$NON-NLS-1$ //$NON-NLS-2$
                if (state == BluetoothHeadset.STATE_CONNECTED)
                {
                    mConnectedHeadset = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

                    // Calling startVoiceRecognition always returns false here, 
                    // that why a count down timer is implemented to call
                    // startVoiceRecognition in the onTick.
                    mIsCountDownOn = true;
                    mCountDown11.start();

                    // override this if you want to do other thing when the device is connected.
                    onHeadsetConnected();

                    Log.d(TAG, "Start count down"); //$NON-NLS-1$
                }
                else if (state == BluetoothHeadset.STATE_DISCONNECTED)
                {
                    // Calling stopVoiceRecognition always returns false here
                    // as it should since the headset is no longer connected.
                    if (mIsCountDownOn)
                    {
                        mIsCountDownOn = false;
                        mCountDown11.cancel();
                    }
                    mConnectedHeadset = null;

                    // override this if you want to do other thing when the device is disconnected.
                    onHeadsetDisconnected();

                    Log.d(TAG, "Headset disconnected"); //$NON-NLS-1$
                }
            }
            else // audio
            {
                state = intent.getIntExtra(BluetoothHeadset.EXTRA_STATE, BluetoothHeadset.STATE_AUDIO_DISCONNECTED);
                Log.d(TAG, "\nAction = " + action + "\nState = " + state); //$NON-NLS-1$ //$NON-NLS-2$
                if (state == BluetoothHeadset.STATE_AUDIO_CONNECTED)
                {
                    Log.d(TAG, "\nHeadset audio connected");  //$NON-NLS-1$

                    mIsOnHeadsetSco = true;

                    if (mIsCountDownOn)
                    {
                        mIsCountDownOn = false;
                        mCountDown11.cancel();
                    }

                    // override this if you want to do other thing when headset audio is connected.
                    onScoAudioConnected();
                }
                else if (state == BluetoothHeadset.STATE_AUDIO_DISCONNECTED)
                {
                    mIsOnHeadsetSco = false;

                    // The headset audio is disconnected, but calling
                    // stopVoiceRecognition always returns true here.
                    mBluetoothHeadset.stopVoiceRecognition(mConnectedHeadset);

                    // override this if you want to do other thing when headset audio is disconnected.
                    onScoAudioDisconnected();

                    Log.d(TAG, "Headset audio disconnected"); //$NON-NLS-1$
                }
            }   
        }
    };

    /**
     * API >= 11
     * Try to connect to audio headset in onTick.
     */
    private CountDownTimer mCountDown11 = new CountDownTimer(10000, 1000)
    {
        @TargetApi(Build.VERSION_CODES.HONEYCOMB)
        @SuppressWarnings("synthetic-access")
        @Override
        public void onTick(long millisUntilFinished)
        {
            // First stick calls always returns false. The second stick
            // always returns true if the countDownInterval is set to 1000.
            // It is somewhere in between 500 to a 1000.
            mBluetoothHeadset.startVoiceRecognition(mConnectedHeadset);

            Log.d(TAG, "onTick startVoiceRecognition"); //$NON-NLS-1$
        }

        @SuppressWarnings("synthetic-access")
        @Override
        public void onFinish()
        {
            // Calls to startVoiceRecognition in onStick are not successful.
            // Should implement something to inform user of this failure
            mIsCountDownOn = false;
            Log.d(TAG, "\nonFinish fail to connect to headset audio"); //$NON-NLS-1$
        }
    };

}  

(30. April 2013) Ändern Sie bei Bedarf die Änderung in @TargetApi (Build.VERSION_CODES.HONEYCOMB). Wenn Sie Probleme mit Java.lang.NoClassDefFoundError für API 8 oder 9 haben, entfernen Sie einfach alle API> = 11-Codes. Das startBluetoothSco () funktioniert für alle API-Versionen.

43
Hoan Nguyen

Ich denke, Sie müssen lediglich die Audioeinstellungen in Ihrer Anwendung ändern.

sie sollten den folgenden Code eingeben, wenn Sie den Ton von Ihrem Headset über Bluetooth empfangen und senden möchten.

 AudioManager audioManager;

audioManager = (AudioManager) getSystemService(AUDIO_SERVICE);

audioManager.setMode(AudioManager.MODE_IN_COMMUNICATION);
audioManager.startBluetoothSco();
audioManager.setBluetoothScoOn(true);

Vergessen Sie nicht, die normalen Einstellungen des Telefons auf folgende Weise wiederherzustellen, wenn Sie kein Bluetooth verwenden.

audioManager.setMode(AudioManager.MODE_NORMAL);
audioManager.stopBluetoothSco();
audioManager.setBluetoothScoOn(false);

folgende Berechtigungen werden benötigt:

<uses-permission Android:name="Android.permission.MODIFY_AUDIO_SETTINGS" />

es ist einfach!

11
SerSánGal

Obwohl das Bluetooth-Headset gekoppelt und mit dem Telefon-Audioprofil (HF/HS) verbunden ist, wird die eigentliche Audioverbindung (SCO) nur hergestellt, wenn ein Anruf eingeht und angenommen wird.

Damit Ihre VR-Anwendung die Spracheingabe von einem Bluetooth-Headset akzeptiert, muss Ihre Anwendung bei einem VR-Eingangstrigger eine SCO für das Headset einrichten... Sie müssen die folgenden Optionen verwenden: - isBluetoothScoAvailableOffCall Um zu überprüfen, ob die Plattform diese Funktion unterstützt, starten Sie mit dem startBluetoothSco und stopBluetoothSco die SCO des Headsets.

3
Dennis Mathews

die Einrichtung von startBluetoothSco dauert lange. Dies ist ein Problem, wenn Sie es zur Sprachsteuerung verwenden müssen.

Gibt es eine schnelle Möglichkeit, das Bluetooth-Mikrofon zum Zuhören zu verwenden und es nach dem Anhören auszuschalten?

Wenn die Verbindung während der gesamten Zeit besteht, ist es nicht möglich, Audio über A2DP zu streamen.

Also ideale Welt:

Audioausgang über A2DP. Wenn es zu hören beginnt, verwendet es das Bluetooth-Mikrofon SCO. Jede Antwort ist wieder A2DP.

Wenn das Gerät bereits verbunden ist, können Sie den Medienstrom in Anrufstrom umschalten? Wenn ja, gibt es eine spürbare Verzögerung?

1
gloscherrybomb

Hoan Nguyen hat großartige Arbeit geleistet!
Ich habe festgestellt, dass in einigen Fällen stopBluetoothSco () nicht aufgerufen wird.

Ich schlage eine kleine Änderung in CountDownTimer vor: 

private CountDownTimer mCountDown11 = new CountDownTimer(10000, 1000)
{
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
    @SuppressWarnings("synthetic-access")
    @Override
    public void onTick(long millisUntilFinished)
    {

        mBluetoothHeadset.startVoiceRecognition(mConnectedHeadset);

        Log.d(TAG, "onTick startVoiceRecognition"); //$NON-NLS-1$
    }

    @SuppressWarnings("synthetic-access")
    @Override
    public void onFinish()
    {
        mIsCountDownOn = false;

        /* START EDIT: Unregister broadcast receivers and stop Sco audio connection
           and cancel count down if fails to connect. */

        stopBluetooth11();

        /* END EDIT */

        Log.d(TAG, "\nonFinish fail to connect to headset audio"); //$NON-NLS-1$
    }
};
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