由于我目前正在为Android的一点点蓝牙库，我试图让我发现在我的周围设备的所有服务的UUID。

As I'm currently working on a little bluetooth library for Android, I'm trying to get all the service uuids of the devices I discovered in my surrounding.

在我的广播接收器获取 BluetoothDevice.ACTION_FOUND 的意图，我提取设备和呼叫：

When my broadcast receiver gets the BluetoothDevice.ACTION_FOUND intent, I'm extracting the device and call:

device.fetchUuidsWithSdp();

这将导致 BluetoothDevice.ACTION_UUID 意图为每个设备发现，我处理它们使用相同的接收器：

This will result BluetoothDevice.ACTION_UUID intents for each device found and I'm handling them with the same receiver:

BluetoothDevice d = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
Parcelable[] uuidExtra = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);

if(uuidExtra ==  null) {
    Log.e(TAG, "UUID = null");
}

if(d != null && uuidExtra != null)
    Log.d(TAG, d.getName() + ": " + uuidExtra.toString());

的事情是， uuidExtra 总是空。

我怎样才能周边设备的所有的UUID？

How can i get all the UUIDs of the surrounding devices?

编辑：

进出口工作在一台Nexus 7。我试过$ C $词在互联网上找到，这也给了我一个NullPointerException异常：http://digitalhacksblog.blogspot.de/2012/05/android-example-bluetooth-discover-and.html

Im working on a Nexus 7. I tried code i found on the internet and this also gives me a NullPointerException: http://digitalhacksblog.blogspot.de/2012/05/android-example-bluetooth-discover-and.html

感谢你。

推荐答案

的documentation在这个国家......

The documentation on this states...

总是包含额外的字段 BluetoothDevice.EXTRA_UUID

不过，就像你一样，我发现这是不正确的。

However, just like you, I have found this not to be true.

如果你调用 fetchUuidsWithSdp（），而设备发现仍在进行 BluetoothDevice.EXTRA_UUID 可以为空。

If you call fetchUuidsWithSdp() while device discovery is still taking place BluetoothDevice.EXTRA_UUID can be null.

您应该等待，直到收到 BluetoothAdapter.ACTION_DISCOVERY_FINISHED 您拨打任何电话，以前fetchUuidsWithSdp（）。

You should wait until you receive BluetoothAdapter.ACTION_DISCOVERY_FINISHED before you make any calls to fetchUuidsWithSdp().