Get bluetooth uuid android

How to get the uuid for ble device in android

I am new to android development. I am working with ble scanning , connection etc.I want to display specific ble device according to UUID . How can I scan ble device using UUID.

1 Answer 1

You can use startScan (List filters, ScanSettings settings, ScanCallback callback) method inside class BluetoothLeScanner. Set the service UUID in the ScanFilter to display specific BLE devices according to UUIDs.

@Override public void startScan(final BleDeviceScanCallback callback) < mCallback = callback; Listfilters = new ArrayList(); if (mServiceUuids != null && mServiceUuids.length > 0) < for (UUID uuid : mServiceUuids) < ScanFilter filter = new ScanFilter.Builder().setServiceUuid( new ParcelUuid(uuid)).build(); filters.add(filter); >> ScanSettings settings = new ScanSettings.Builder().build(); mBleScanner = mBluetoothAdapter.getBluetoothLeScanner(); if (mBleScanner != null) < if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M) < mBleScanner.startScan(filters, settings, mScanCallback); >else < // Unless required permissions were acquired, scan does not start. if (BleUtils.isBLEPermission(mContext)) < mBleScanner.startScan(filters, settings, mScanCallback); >> > > 

More API details can be found here.

Google Bluetooth LE Central Application Example here.

Please Note: BluetoothAdapter.startLeScan method was deprecated in API level 21. use startScan(List, ScanSettings, ScanCallback) instead.

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Android Bluetooth: Get UUIDs of discovered devices

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

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()); 

The thing is, that uuidExtra is always null . How can i get all the UUIDs of the surrounding devices? EDIT: 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 Thank you.

6 Answers 6

Always contains the extra field BluetoothDevice.EXTRA_UUID

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

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

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

I get the same problem, even if i wait for device discovery to finish before calling fetchUuidsWithSdp() .

This works for me in some cases. When discovering devices from my Samsung Galaxy Nexus 2, I can only receive the services on my HTC One (M7), not from my MacBook Pro (then the result is null).

EDIT: it seems completely random if fetchUuidsWithSdp() works or not, no matter at which point in the process I call it.

ACTION_DISCOVERY_FINISHED is never called even if I added filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);

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.

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

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Android Bluetooth Where can I get UUID?

I want to connect 3 devices via Bluetooth. As for example I use BluetoothChat. So How I understand I should use different UUID for this devices. I have been trying to connect via such UUID=766c82f0-e1b4-11df-85ca-0800200c9a66, which I ‘ve get it from Web UUID generator. But it doesn’t work at all. I have succesfully connected (to 1 device) if I used UUID=00001101-0000-1000-8000-00805F9B34FB Where can I get UUID?

6 Answers 6

if you are using linux or mac, enter «uuidgen» this command without quotes in terminal, you will get an unique UUID, use that in your android project.

UUid is used to uniquely identify applications.Each application have a unique uuid .so use the same uuid for each device

In order to connect with your targetted devices, you need to know what are you connecting to. It’ll be more helpful to list your device targets.

Here you need to know what bluetooth profile is being used in each of your target device. You mentioned that «UUID=00001101-0000-1000-8000-00805F9B34FB» works.

This is due to your device is having a SPP Bluetooth profile. SPP stands for Serial Port Profile.

You must get the Bluetooth UUID to establish a connection to the device,

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)

Don´t forget to add the permission:

and you must enable bluetooth to get Uuids, for example:

UUID: 0000110f-0000-1000-8000-00805f9b12fb UUID: 0000111d-0000-1000-8000-00805f9b12fb UUID: 0000111a-0000-1000-8000-00805f9b12fb 

Imagine, that u have a one or more services. Each service have its own UUID. UUID=00001101-0000-1000-8000-00805F9B34FB is special one for SPP. Some devices (for example, Bluetooth serial board) will not work if u not set SPP UUID. But for peer-to-peer connection between Android devices such as smartphones u may use your own generated UUID. Devices must set same UUID to found each other and connect. UUID format: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx where x=[0. 9]|[A. F]. Good idea is to set xxxxxxxx-xxxx-xxxx-xxxx- to Your generated unique id. Second part xxxxxxxxxxxx may be set to Your server MAC address without «:». On client side u may construct UUID from known generated unique id (embedded to Your app) and server MAC address without «:». You can get server MAC address during Bluetooth device discovery.

@RohitRawat Thank You for vote up. Unfortunately I don’t need o use Bluetooth API any more and don’t have latest info about it. I’m sure a logic for getting UUID changed a lot since my answer. If You need UUID in 2021, You need to check Android docs. For UUID «example», my answer contains it. If You need a code to start, check Android SDK samples on GitHub.

you have to do a service discovery with the device you are trying to connect with, Get the UUID that it returns (which will be corresponding to the service that is running on the device and accepting connections) and then connect to it.

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How do I get the UUID of a bluetooth device?

I need to know UUID on API 8 (2.2) or possibly 2.3.3. As I understand the documentation, this should be allowed:

 phoneDevice = blueAdapter.getRemoteDevice(phoneAddress); ParcelUuid[] phoneUuids = phoneDevice.getUuids(); // Won't compile 

Eclipse gives me: «The method getUuids() is undefined for the type BluetoothDevice.» But see: http://developer.android.com/reference/android/bluetooth/BluetoothDevice.html#getUuids() Also, I would like to know how the UUIDs are «parceled» inside the ParcelUuid[]. In case I ever manage to get there, how do I retrieve a UUID from a parcelUuid[]? Documentation for Android bluetooth seems to be very poor, in my opinion. What a joke! Now I try to get it from the intent, but this too gives: *»EXTRA_UUID cannot be resolved or is not a field»*:

intent.getParcelableExtra(BluetoothDevice.EXTRA_UUID); 

Hi facing same problem , in my project have provide support from android 2.3.1 , min api level 8. Please help.

Hi. Long time passed fro this post but I am now facing this exact same issue. Do you have any workaround for that (my minimum API is 10) ?Thanks for any clue

5 Answers 5

You have to use reflection to use the getUuids() and fetchUuidsWithSdp() on android version < 3. So, try the code:

Method method = phoneDevice.getClass().getMethod("getUuids", null); ParcelUuid[] phoneUuids = (ParcelUuid[]) method.invoke(phoneDevice, null); 

//this will support from API level 15 and above.

Broadcast Action: This intent is used to broadcast the UUID wrapped as a ParcelUuid of the remote device after it has been fetched. This intent is sent only when the UUIDs of the remote device are requested to be fetched using Service Discovery Protocol Always contains the extra field EXTRA_DEVICE Always contains the extra field EXTRA_UUID Requires BLUETOOTH to receive. Constant Value: "android.bluetooth.device.action.UUID" 

//no way to degrade its hardware related. there is no supporting jar also. http://developer.android.com/sdk/compatibility-library.html

So, the way to do it is to create UUIDs? It’s not a property of the hardware, it’s just a number I make up, is that right?

Unfortunately, I don’t think there is any good way to get the UUID’s supported by a BluetoothDevice with API level < 15. I guess that's why they added the new functions in API 15.

BluetoothClass is useful as a hint to roughly describe a device (for example to show an icon in the UI), but does not reliably describe which Bluetooth profiles or services are actually supported by a device. Accurate service discovery is done through SDP requests, which are automatically performed when creating an RFCOMM socket with createRfcommSocketToServiceRecord(UUID) and listenUsingRfcommWithServiceRecord(String, UUID).

So, perhaps the device class could be used as a hint as to what services will be available until you perform one of the listed functions. Certainly it doesn’t hurt to check the class since this won’t require any additional bluetooth operations.

Note that the service class is also available (it is part of the device class) but this is just a general class, not a listing of specific services (like from SDP).

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How to find the UUID of serial port Bluetooth device?

I want to receive data from the serial port bluetooth device to android phone. But i don’t know the UUID of that device how to find the UUID of that device?

7 Answers 7

Extending what pwc said about the UUID being 0x1101, this is the 16 bit version of the UUID as far as I can tell. I could not work out how to instantiate an UUID with a 16 bit UUID. But as this post says you can do it by:

private static final UUID MY_UUID = UUID.fromString(«00001101-0000-1000-8000-00805f9b34fb»);

This worked for me to connect to a serial bluetooth module I bought from Deal Extreme

If the device is using serial port profile, then yes, it is simply:

For other pre-defined options, see the list of pre-defined UUIDs as listed in javax.bluetooth :

The UUID for the SPP Serial Port service is defined by the Bluetooth SIG to be 0x1101.

Just open your device in adb shell type sdptool and browse you got your device UUID

In the Android Bluetooth API documentation:

From API level 15, you can query the supported features (UUIDs) of the remote device, use the method on the BluetoothDevice object obtained in the search:

public ParcelUuid[] getUuids () 

you can get Device UID by simple Calling

perticulerDevice.getUuids()[0].toString() 

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