Android蓝牙：IsConnected？

Question

有没有办法弄清楚你是否连接到蓝牙设备？

我有我的应用程序连接，发送/接收就好了。但是我需要一种方法来看看我是否仍然保持连接说...如果我走出范围并走回范围。

我注意到蓝牙套接字中没有isConnected功能，就像TCP中的内容一样......有没有办法查看你是连接还是与你应该连接的设备进行通信？

Answer 1

我能够解决这个问题的唯一方法是每秒发送一次“心跳”消息。如果它没有通过，那么我认为蓝牙已断开连接。

Answer 2

发送尽可能少的数据，看看是否收到回复。如果你不这样做，那么你就没有联系。

Answer 3

以下广播接收器值应告知您何时断开任何BT设备：

intentFilter.addAction(BluetoothDevice.ACTION_ACL_CONNECTED); // API 5
intentFilter.addAction(BluetoothDevice.ACTION_ACL_DISCONNECTED); // API 5

如果您对特定设备感兴趣，则应该实现BluetoothProfile.ServiceListener代理侦听器：

private class MyBluetoothHeadsetListener //
                implements BluetoothProfile.ServiceListener
{
    @Override
    public void onServiceDisconnected(int profile)
    {
    }

    @Override
    public void onServiceConnected(int profile, BluetoothProfile proxy)
    {
        if (profile == BluetoothProfile.A2DP)
        {
            BluetoothA2dp bluetoothA2dp = (BluetoothA2dp) proxy;
            mDevicesA2dp = bluetoothA2dp.getConnectedDevices();
            for (BluetoothDevice deviceA2dp : mDevicesA2dp)
            {
                boolean isA2dpPlaying = bluetoothA2dp.isA2dpPlaying(deviceA2dp);
            }
            return;
        }

        if (profile == BluetoothProfile.HEADSET)
        {
            BluetoothHeadset bluetoothHeadset = (BluetoothHeadset) proxy;
            mDevicesNonA2dp = bluetoothHeadset.getConnectedDevices();
            if (mDevicesNonA2dp.size() > 0)
            {
                for (BluetoothDevice deviceNonA2dp : mDevicesNonA2dp)
                {
                    BluetoothClass bluetoothClass = deviceNonA2dp.getBluetoothClass();
                    String bluetoothDeviceClass = bluetoothClassToString(bluetoothClass);
                    boolean isAudioConnected = bluetoothHeadset.isAudioConnected(deviceNonA2dp);
                }
            }
            return;
        }
    }
}

...

private MyBluetoothHeadsetListener mProfileListener = new MyBluetoothHeadsetListener();

...

BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
adapter.getProfileProxy(mApp, mProfileListener, BluetoothProfile.HEADSET);
adapter.getProfileProxy(mApp, mProfileListener, BluetoothProfile.A2DP);