Android 蓝牙:获取已发现设备的 UUID [英] Android Bluetooth: Get UUIDs of discovered devices

问题描述

由于我目前正在为 Android 开发一个小型蓝牙库，我正在尝试获取我在周围发现的设备的所有服务 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.

当我的广播接收器获得 BluetoothDevice.ACTION_FOUND 意图时，我正在提取设备并调用:

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

device.fetchUuidsWithSdp();

这将为找到的每个设备产生 BluetoothDevice.ACTION_UUID 意图，我正在使用相同的接收器处理它们:

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());

问题是，uuidExtra 总是 null.

如何获取周围设备的所有 UUID?

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

我在 Nexus 7 上工作.我尝试了在互联网上找到的代码，这也给了我一个 NullPointerException: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

谢谢.

推荐答案

文档 在这个状态...

总是包含额外的字段BluetoothDevice.EXTRA_UUID

然而，就像你一样，我发现这不是真的.

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

如果您在设备发现过程中调用 fetchUuidsWithSdp()，BluetoothDevice.EXTRA_UUID 可以为 null.

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

您应该等到收到 BluetoothAdapter.ACTION_DISCOVERY_FINISHED 后再调用 fetchUuidsWithSdp().

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

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