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I just started to take a look at xamarin and now I want to scan for bluetooth-devices. Therefor I use the following code:
BluetoothAdapter bluetoothAdapter = BluetoothAdapter.DefaultAdapter;
bluetoothAdapter.StartDiscovery();
And I have the following class for getting the result:
[BroadcastReceiver]
[IntentFilter(new [] {BluetoothAdapter.ActionDiscoveryFinished})]
public class BluetoothReceiver : BroadcastReceiver
{
public BluetoothReceiver()
{
}
public override void OnReceive(Context context, Intent intent)
{
if (BluetoothAdapter.ActionDiscoveryFinished.Equals(intent.Action))
{
}
}
}
I've also set the permissions for my app to BLUETOOTH and BLUETOOTH_ADMIN. Everything just works fine and the OnReceive-Method is called correctly. My problem now is: How do I get the found devices from the parameters of the OnReceive-Method?
945
The BluetoothAdapter lets you perform fundamental Bluetooth tasks, such as initiate device discovery, query a list of bonded (paired) devices, instantiate a BluetoothDevice using a known MAC address, and create a BluetoothServerSocket to listen for connection requests from other devices, and start a scan for Bluetooth ...
public static final String EXTRA_DISCOVERABLE_DURATION Used as an optional int extra field in ACTION_REQUEST_DISCOVERABLE intents to request a specific duration for discoverability in seconds. The current default is 120 seconds, and requests over 300 seconds will be capped.
The getBoundedDevices() method of BluetoothAdapter class provides a set containing list of all paired or bounded bluetooth devices. In this example, we are checking if the bluetooth is turned off, if yes then turn it on and list all the paired devices.
If you want to get the UUID of a Bluetooth device in Android, there are a few different ways to do it. One way is to use the BluetoothAdapter. getRemoteDevice(String address) method. This will return a BluetoothDevice object, which has a getUuids() method that will return an array of UUIDs.
ACTION_DISCOVERY_FINISHED doesn't tell you anything other than the discovery action has finished. https://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#ACTION_DISCOVERY_FINISHED
If you wanted to grab devices from the scan, you should read what startDiscovery() has to say regarding finding devices:
The discovery process usually involves an inquiry scan of about 12 seconds, followed by a page scan of each new device to retrieve its Bluetooth name.
This is an asynchronous call, it will return immediately. Register for ACTION_DISCOVERY_STARTED and ACTION_DISCOVERY_FINISHED intents to determine exactly when the discovery starts and completes. Register for ACTION_FOUND to be notified as remote Bluetooth devices are found.
https://developer.android.com/reference/android/bluetooth/BluetoothAdapter.html#startDiscovery()
Thus you should use ACTION_FOUND and parse the EXTRA_DEVICE for devices:
Broadcast Action: Remote device discovered.
Sent when a remote device is found during discovery.
Always contains the extra fields EXTRA_DEVICE and EXTRA_CLASS. Can contain the extra fields EXTRA_NAME and/or EXTRA_RSSI if they are available.
https://developer.android.com/reference/android/bluetooth/BluetoothDevice.html#ACTION_FOUND
In sequence of events, you would do the following:
ACTION_DISCOVERY_STARTED - Which will start discoveryACTION_FOUND - Which will find a deviceACTION_DISCOVERY_FINISHED - Which will end discovery
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