Android - Get Bluetooth UUID for this device

Question

I was browing Stack and the internet for a simple solution to get the UUID of the device I'm currently using. I stumbled over posts like this but none of them seemed to help me.

The doc tells me about this getUuids() function but when going through the doc for Android Bluetooth I end up having a BluetoothAdapter but I need a BluetoothDevice to execute this function.

So I need to know the following:

1) Is the function returning really the device UUID? Because the name saids plural (getUuids)

2) How do I get an instance of this BluetoothDevice?

Thanks!

Answer 1

Using reflection you can invoke the hidden method getUuids() on the BluetoothAdater:

BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();

Method getUuidsMethod = BluetoothAdapter.class.getDeclaredMethod("getUuids", null);

ParcelUuid[] uuids = (ParcelUuid[]) getUuidsMethod.invoke(adapter, null);

for (ParcelUuid uuid: uuids) {
    Log.d(TAG, "UUID: " + uuid.getUuid().toString());
}

This is the result on a Nexus S:

UUID: 00001000-0000-1000-8000-00805f9b34fb
UUID: 00001001-0000-1000-8000-00805f9b34fb
UUID: 00001200-0000-1000-8000-00805f9b34fb
UUID: 0000110a-0000-1000-8000-00805f9b34fb
UUID: 0000110c-0000-1000-8000-00805f9b34fb
UUID: 00001112-0000-1000-8000-00805f9b34fb
UUID: 00001105-0000-1000-8000-00805f9b34fb
UUID: 0000111f-0000-1000-8000-00805f9b34fb
UUID: 0000112f-0000-1000-8000-00805f9b34fb
UUID: 00001116-0000-1000-8000-00805f9b34fb

where, for instance, 0000111f-0000-1000-8000-00805f9b34fb is for HandsfreeAudioGatewayServiceClass and 00001105-0000-1000-8000-00805f9b34fb is for OBEXObjectPushServiceClass. Actual availability of this method may depend on device and firmware version.

Answer 2

To achieve this you must define the Bluetooth permission:

<uses-permission android:name="android.permission.BLUETOOTH"/>

Then you can invoke the method getUuids() using reflection:

    try {
    BluetoothAdapter adapter = BluetoothAdapter.getDefaultAdapter();
    Method getUuidsMethod = BluetoothAdapter.class.getDeclaredMethod("getUuids", null);
    ParcelUuid[] uuids = (ParcelUuid[]) getUuidsMethod.invoke(adapter, null);

         if(uuids != null) {
             for (ParcelUuid uuid : uuids) {
                 Log.d(TAG, "UUID: " + uuid.getUuid().toString());
             }
         }else{
             Log.d(TAG, "Uuids not found, be sure to enable Bluetooth!");
         }

    } catch (NoSuchMethodException e) {
        e.printStackTrace();
    } catch (IllegalAccessException e) {
        e.printStackTrace();
    } catch (InvocationTargetException e) {
        e.printStackTrace();
    }

You must enable bluetooth to get Uuids.