CODEWITHSUNDEEP
androidbluetoothandroid-bluetoothbluetooth-profile
Steven Wexler
Steven Wexler

Reputation: 17299

Android bluetooth get connected devices

How can I get a list of all connected bluetooth devices for Android regardless of profile?

Alternatively, I see that you can get all connected devices for a specific profile via BluetoothManager.getConnectedDevices.

And I guess I could see which devices are connected by listening for connections/disconnections via ACTION_ACL_CONNECTED/ACTION_ACL_DISCONNECTED...seems error prone.

But I'm wondering if there's a simpler way to get the list of all connected bluetooth devices.

Upvotes: 18

Views: 24901

Answers (3)

Abdallah AbuSalah
Abdallah AbuSalah

Reputation: 126

The best way to get your connected devices like the following:

  1. paired device

    val btManager = baseContext.getSystemService(BLUETOOTH_SERVICE) as BluetoothManager
val pairedDevices = btManager.adapter.bondedDevices

if (pairedDevices.size > 0) {

    for (device in pairedDevices) {
        val deviceName = device.name
        val macAddress = device.address
        val aliasing = device.alias

        Log.i(
            " pairedDevices ",
            "paired device: $deviceName at $macAddress + $aliasing " + isConnected(device)
        )
    }
}

  2. check whatever is connected or no.

To check if the paired Device is connected or no, u need to use this method:

private fun isConnected(device: BluetoothDevice): Boolean {
    return try {
        val m: Method = device.javaClass.getMethod("isConnected")
        m.invoke(device) as Boolean
    } catch (e: Exception) {
        throw IllegalStateException(e)
    }
}

ref here.

Upvotes: 6

M. Usman Khan
M. Usman Khan

Reputation: 4458

That's how you get "connected" devices, not just paired devices. No need to check further state of it.

val btManager = view.getSystemService(BLUETOOTH_SERVICE) as BluetoothManager
val connectedDevices = btManager.getConnectedDevices(GATT)

Upvotes: 1

alpartis
alpartis

Reputation: 1122

To see a complete list, this is a 2-step operation:

  1. get list of currently paired devices
  2. scan for, or discover, all others in range

To get a list of, and iterate, the currently paired devices:

Set<BluetoothDevice> pairedDevices = BluetoothAdapter.getDefaultAdapter().getBondedDevices();
if (pairedDevices.size() > 0) {
    for (BluetoothDevice d: pairedDevices) {
        String deviceName = d.getName();
        String macAddress = d.getAddress();
        Log.i(LOGTAG, "paired device: " + deviceName + " at " + macAddress);
        // do what you need/want this these list items
    }
}

Discovery is a little bit more of a complex operation. To do this, you'll need to tell the BluetoothAdapter to start scanning/discovering. As it finds things, it sends out Intents that you'll need to receive with a BroadcastReceiver.

First, we'll set up the receiver:

private void setupBluetoothReceiver()
{
    BroadcastRecevier btReceiver = new BroadcastReciver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            handleBtEvent(context, intent);
        }
    };
    IntentFilter eventFilter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
    // this is not strictly necessary, but you may wish
    //  to know when the discovery cycle is done as well
    eventFilter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
    myContext.registerReceiver(btReceiver, eventFilter);
}

private void handleBtEvent(Context context, Intent intent)
{
    String action = intent.getAction();
    Log.d(LOGTAG, "action received: " + action);

    if (BluetoothDevice.ACTION_FOUND.equals(action)) {
        BluetoothDevice device = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);
        Log.i(LOGTAG, "found device: " + device.getName());
    } else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) {
        Log.d(LOGTAG, "discovery complete");
    }
}

Now all that is left is to tell the BluetoothAdapter to start scanning:

BluetoothAdapter btAdapter = BluetoothAdapter.getDefaultAdapter();
// if already scanning ... cancel
if (btAdapter.isDiscovering()) {
    btAdapter.cancelDiscovery();
}

btAdapter.startDiscovery();

Upvotes: 4

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