Bluetooth SCO does not work after an incoming call

Question

I am trying to send all application sound through SCO.

I can send audio successfully,

But when an incoming call arrives, I need to disable the SCO form so that the application sound does not interfere with the call,

The problem is that when I try to redirect the sound to SCO after the call, it does not work.

Here is the code that I use to send audio to SCO:

public class BluetoothManager {
// For Bluetooth connectvity
private static String TAG = "BluetoothManager";
private static BluetoothAdapter mBluetoothAdapter =    BluetoothAdapter.getDefaultAdapter();
private static AudioManager aM;

/**
 * Set the audio manager of the device.
 * @param c: The context this method is called from
 */
public static void setAudioManager(Context c) {
    aM = (android.media.AudioManager)c.getSystemService(Context.AUDIO_SERVICE);
}

/**
 * Check if a Bluetooth headset is connected. If so, route audio to Bluetooth SCO.
 */
private static void initializeAudioMode(Context context) {
    BluetoothProfile.ServiceListener mProfileListener = new BluetoothProfile.ServiceListener() {
        public void onServiceConnected(int profile, BluetoothProfile proxy) {
            if (profile == BluetoothProfile.HEADSET) {
                BluetoothHeadset bh = (BluetoothHeadset) proxy;
                List<BluetoothDevice> devices = bh.getConnectedDevices();
                if (devices.size() > 0) {
                    enableBluetoothSCO();
                }
            }
            mBluetoothAdapter.closeProfileProxy(profile, proxy);
        }
        public void onServiceDisconnected(int profile) {}
    };
    mBluetoothAdapter.getProfileProxy(context, mProfileListener, BluetoothProfile.HEADSET);
}

/**
 * Bluetooth Connectvity
 *   The following methods are associated with enabling/disabling Bluetooth.
 *   In the future we may want to disable other sources of audio.
 */
private static void enableBluetoothSCO() {
    aM.setMode(AudioManager.MODE_IN_CALL);
    aM.startBluetoothSco();
    aM.setBluetoothScoOn(true);
}

/** Right now, this simply enables Bluetooth */
@SuppressLint("NewApi")
public static boolean enableBluetooth(Context c) {
    // If there is an adapter, enable it if not already enabled
    if (mBluetoothAdapter != null) {

        if (!mBluetoothAdapter.isEnabled()) {
            mBluetoothAdapter.enable(); 
        }

        setAudioManager(c);
        initializeAudioMode(c);
        Log.e(TAG, "SCO: " + aM.isBluetoothScoOn());
        Log.e(TAG, "A2DP: " + aM.isSpeakerphoneOn());
        return true;
    } else {
        Log.v(TAG, "There is no bluetooth adapter");
        return false;
    }
}

/** Right now, this simply disables Bluetooth */
public static void disableBluetooth() {
    // If there is an adapter, disabled it if not already disabled
    if (mBluetoothAdapter != null) {
        if (mBluetoothAdapter.isEnabled()) {
            mBluetoothAdapter.disable(); 
        }
    } else {
        Log.v(TAG, "There is no bluetooth adapter");
    }
}

public static void restartBluetooth(){
    aM.setMode(AudioManager.MODE_IN_CALL);

}
public static void stopBluetooth(){
    aM.setMode(AudioManager.MODE_NORMAL);

}

}

When I call stopBluetooth()correctly, the sound of the application is no longer sent to the headset,

But when I call restartBluetooth(), the sound is not played in the form of a headset for its intended purpose, but from the speakers of the phone.

Answer 1

, SCO ? , SCO .

enableBluetoothSCO() restartBluetooth()

Answer 2

, , :

aM.startBluetoothSco(); aM.setBluetoothScoOn(true);

.

Answer 3

, . :

public static void restartBluetooth(){
    enableBluetooth(getApplicationContext());
}

, , - .

Answer 4

Google Doc ,

“A phone application always takes precedence when using an SCO connection for telephony. If this method is called during a phone call, it will be ignored. Similarly, if a call is received or sent while using an SCO connection, the connection will be lost for the application and will NOT be returned automatically at the end of the call. "

Therefore, when the call is disconnected, you need to reconnect by calling startBluetoothSco ()