将其移至答案，以便进行进一步的评论。效果很好！

public class BluetoothReceiver extends BroadcastReceiver {

private AudioManager localAudioManager;

private static final int STATE_DISCONNECTED = 0x00000000;

private static final String EXTRA_STATE = "android.bluetooth.headset.extra.STATE";

private static final String TAG = "BluetoothReceiver";

private static final String ACTION_BT_HEADSET_STATE_CHANGED = "android.bluetooth.headset.action.STATE_CHANGED";

private static final String ACTION_BT_HEADSET_FORCE_ON = "android.bluetooth.headset.action.FORCE_ON";

private static final String ACTION_BT_HEADSET_FORCE_OFF = "android.bluetooth.headset.action.FORCE_OFF";

@Override

public void onReceive(final Context context, final Intent intent) {

Log.i(TAG,"onReceive - BluetoothBroadcast");

localAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);

final String action = intent.getAction();

if (action.equals(ACTION_BT_HEADSET_STATE_CHANGED)) {

final int extraData = intent.getIntExtra(EXTRA_STATE, STATE_DISCONNECTED);

if (extraData == STATE_DISCONNECTED) {

localAudioManager.setBluetoothScoOn(false);

localAudioManager.stopBluetoothSco();

localAudioManager.setMode(AudioManager.MODE_NORMAL);

Log.i(TAG, "Bluetooth Headset Off " + localAudioManager.getMode());

Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());

} else {

localAudioManager.setMode(0);

localAudioManager.setBluetoothScoOn(true);

localAudioManager.startBluetoothSco();

localAudioManager.setMode(AudioManager.MODE_IN_CALL);

Log.i(TAG, "Bluetooth Headset On " + localAudioManager.getMode());

Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());

}

}

if (action.equals(ACTION_BT_HEADSET_FORCE_ON)) {

localAudioManager.setMode(0);

localAudioManager.setBluetoothScoOn(true);

localAudioManager.startBluetoothSco();

localAudioManager.setMode(AudioManager.MODE_IN_CALL);

Log.i(TAG, "Bluetooth Headset On " + localAudioManager.getMode());

Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());

}

if (action.equals(ACTION_BT_HEADSET_FORCE_OFF)) {

localAudioManager.setBluetoothScoOn(false);

localAudioManager.stopBluetoothSco();

localAudioManager.setMode(AudioManager.MODE_NORMAL);

Log.i(TAG, "Bluetooth Headset Off " + localAudioManager.getMode());

Log.i(TAG, "A2DP: " + localAudioManager.isBluetoothA2dpOn() + ". SCO: " + localAudioManager.isBluetoothScoAvailableOffCall());

}

}

}