Android Bluetooth: Get UUIDs of discovered devices

Question

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.

When my

Answer 1

NOTE: This solution applies to CLASSIC bluetooth and not BLE. For BLE check how to send manufacturer specific Data in advertiser on the peripheral side

The problem with fetching Uuids is that you have only one bluetooth adapter, and we cannot have parallel api calls which uses adapter for its purpose.

As Eddie pointed out, wait for BluetoothAdapter.ACTION_DISCOVERY_FINISHED and then call fetchUuidsWithSdp().

Still this cannot guarantee uuids to be fetched for all devices. In addition to this one must wait for each subsequent call to fetchuuidsWithSdp() to complete, and then give a call to this method for another device.

See the code below --

ArrayList mDeviceList = new ArrayList();

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();

        if (BluetoothDevice.ACTION_FOUND.equals(action)) {
            BluetoothDevice device = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            mDeviceList.add(device);
        } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
            // discovery has finished, give a call to fetchUuidsWithSdp on first device in list.
            if (!mDeviceList.isEmpty()) {
                BluetoothDevice device = mDeviceList.remove(0);
                boolean result = device.fetchUuidsWithSdp();
            }
        } else if (BluetoothDevice.ACTION_UUID.equals(action)) {
            // This is when we can be assured that fetchUuidsWithSdp has completed.
            // So get the uuids and call fetchUuidsWithSdp on another device in list

            BluetoothDevice deviceExtra = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
            Parcelable[] uuidExtra = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);
            System.out.println("DeviceExtra address - " + deviceExtra.getAddress());
            if (uuidExtra != null) {
                for (Parcelable p : uuidExtra) {
                    System.out.println("uuidExtra - " + p);
                }
            } else {
                System.out.println("uuidExtra is still null");
            }
            if (!mDeviceList.isEmpty()) {
                BluetoothDevice device = mDeviceList.remove(0);
                boolean result = device.fetchUuidsWithSdp();
            }
        }
    }
}

UPDATE: Latest android versions (mm & above) would result in triggering a pairing process with each device