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?
1 Answers
Answers 1
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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