蓝牙SCO在来电后失败

Question

我正在尝试通过SCO发送应用程序的所有音频。

我能够成功地发送音频，

但是当有来电时，我需要断开与SCO的连接，以便应用程序音频不会干扰呼叫，

问题是，当我尝试在呼叫后将音频重新路由到SCO时，它不起作用。

下面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，音频并不是从耳机中播放出来的，而是从电话扬声器中播放出来的。

Answer 1

有没有可能上海合作组织的链接是在通话结束后中断的？如果是这种情况，那么SCO链路也必须随路由音频一起启动。

您是否尝试过在restartBluetooth()中调用enableBluetoothSCO()

Answer 2

您可能需要调用：

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

在您设置模式之后。

Answer 3

在你的重新启动函数中，再次初始化所有的东西，看看它是否工作。如下所示：

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

如果这是有效的，那么这意味着当调用结束时，由于某种原因，最后的初始化将丢失。