Ggtcf

I have a very simple activity for discovering other android devices via bluetooth:

public void onCreate(Bundle savedInstanceState)
 super.onCreate(savedInstanceState);

 // Get the local Bluetooth adapter
 FrameLayout f = new FrameLayout(this);
 setContentView(f);
 IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);

 this.registerReceiver(mReceiver, filter);
 // Register for broadcasts when discovery has finished
 filter = new IntentFilter(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
 this.registerReceiver(mReceiver, filter);

 mBtAdapter = BluetoothAdapter.getDefaultAdapter();

 // Get a set of currently paired devices
 Set<BluetoothDevice> pairedDevices = mBtAdapter.getBondedDevices();


 // Request discover from BluetoothAdapter
 Log.i("bluetooth", "about to start device discovery");
 mBtAdapter.startDiscovery();

 //start receiving stuff
 mReceiver = new BluetoothReceiver();

The problem is that the BluetoothRecieiver class called at the end of the activity's onCreate() doesn't seem to find and devices, although I have one turned on in the vicinity when I am debugging this:

 public class BluetoothReceiver extends BroadcastReceiver 
public ArrayAdapter<String> mNewDevicesArrayAdapter;
 @Override
 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);
 // If it's already paired, skip it, because it's been listed already
 if (device.getBondState() != BluetoothDevice.BOND_BONDED) 
 Log.i("face", device.getName() + "n" + device.getAddress());
 mNewDevicesArrayAdapter.add(device.getName() + "n" + device.getAddress());
 
 // When discovery is finished, change the Activity title
 else if (BluetoothAdapter.ACTION_DISCOVERY_FINISHED.equals(action)) 

 if (mNewDevicesArrayAdapter.getCount() == 0) 
 Log.i("face", "found NOTHING!");
 mNewDevicesArrayAdapter.add("no devices found");
 
 
 

Is there anything I am missing here?

I think it's because when you call registerReceiver() mReceiver is null, move mReceiver = new BluetoothReceiver(); above the first this.registerReceiver(mReceiver, filter);, also you could do something like

filter = new IntentFilter();
filter.addAction(BluetoothDevice.ACTION_FOUND);
filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);

and then call this.registerReceiver(mReceiver, filter); only one time