android - 来电后蓝牙 SCO 失败

Question

我正在尝试通过 SCO 发送应用程序的所有音频。

我能够成功发送音频，

但是当来电时，我需要断开与 SCO 的连接，这样应用程序的音频就不会干扰通话，

问题是，当我在通话后尝试将音频重新路由到 SCO 时，它不起作用。

这是我用来将音频发送到 SCO 的代码:

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);

}

}

当我正确调用 stopBluetooth() 时，应用程序的音频不再发送到耳机，

但是当我调用 restartBluetooth() 时，音频不是按预期从耳机播放的，而是从手机扬声器播放的。

Answer 1

有没有可能是通话结束后SCO链接挂了？如果是这种情况，则还必须在路由音频的同时启动 SCO 链接。

你试过在restartBluetooth()中调用enableBluetoothSCO()