Recipe Discovering Bluetooth Devices

After Bluetooth is activated, to discover paired or available Bluetooth devices, use the BluetoothAdapter instance's startdiscovery() method as an asynchronous call.This requires registering a BroadcastReceiver to listen for ACTION_FOUND events that tell the application whenever a new remote Bluetooth device is discovered. This is shown in the example code in Listing 7.10.

Listing 7.10 Example Code for Discovering Bluetooth Devices private final BroadcastReceiver mReceiver = new BroadcastReceiver() { public void onReceive(Context context, Intent intent) { String action = intent.getAction(); // When discovery finds a device if (BluetoothDevice.ACTION_FOUND.equals(action)) {

// Get the BluetoothDevice object from the Intent BluetoothDevice device = intent.getParcelableExtra(

BluetoothDevice.EXTRA_DEVICE); Log.v("BlueTooth Testing",device.getName() + "\n" + device.getAddress());

IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);

registerReceiver(mReceiver, filter);

myBluetooth.startDiscovery();

The broadcast receiver can also listen for ACTION_DISCOVERY_STARTED events and action_discovery_finished events that tell the application when the discovery starts and ends.

For other Bluetooth devices to discover the current device, the application can enable discoverability using the action_request_discoverable intent.This activity displays another dialog on top of the application to ask users whether or not they want to make the current device discoverable:

Intent discoverablelntent

= new Intent(BluetoothAdapter.ACTION_REQUEST_DISCOVERABLE); startActivity(discoverablelntent);

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