hrskrs hrskrs - 1 month ago 19
Android Question

All beacons are not shown in Android using altBeacon library

I am using the AltBEacon Android library for developing an iBeacon app for Android devices. I am scanning for beacons, however, only two out of four beacons are found (sometimes 1/4).

I increase

mBeaconManager.setForegroundScanPeriod(5000l);
to 5 seconds, but still same result. I am not sure if the
CustomAdapter
I use for binding details to view is wrong or the issue is do with the mobile device (I am using Galaxy Note II - Android 4.4.2 (KitKat))? Can anyone locate my mistake?

Another issue is that the distance calculation from device to the beacon is returning not correct (when I am approximately 0.5 m away it returns betweem 3-6 m)

What am I doing wrong?

Note: I have checked UUID, Major, Minors of Beacon for any mistake. I have increased the scanning time. None of these worked.

Here is the Fragment that starts monitoring and ranging:

public class FragmentScanBeacons extends Fragment implements BeaconConsumer{

public static Region mRegion = new Region("Server", Identifier.parse("Here is my UUID"), null, null);
private BeaconManager mBeaconManager;

private BeaconBaseAdapter beaconBaseAdapter;

private ListView beaconsListLv;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mBeaconManager = BeaconManager.getInstanceForApplication(getActivity());

//BEACON PARSER
mBeaconManager.getBeaconParsers().add(new BeaconParser().setBeaconLayout("m:2-3=0215,i:4-19,i:20-21,i:22-23,p:24-24"));
//mBeaconManager.debug = true;
beaconBaseAdapter = new BeaconBaseAdapter(getActivity());
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

View view = inflater.inflate(R.layout.fragment_beacons, container, false);

//UI
beaconsListLv = (ListView) view.findViewById(R.id.beaconsListView);

//Set Adapter
beaconsListLv.setAdapter(beaconBaseAdapter);

//Check for bluetooth and Scan for Beacon
verifyBluetooth();

//Start Monitoring and Ranging
mBeaconManager.bind(this);

return view;
}

@Override
public void onResume() {
super.onResume();
if(mBeaconManager.isBound(this)){
mBeaconManager.setBackgroundMode(false);
}
}

@Override
public void onPause() {
super.onPause();
if(mBeaconManager.isBound(this)){
mBeaconManager.setBackgroundMode(true);
}
}

@Override
public void onDestroy() {
super.onDestroy();
mBeaconManager.unbind(this);
}

@Override
public void onBeaconServiceConnect() {
try {

//Scan lasts for SCAN_PERIOD time
mBeaconManager.setForegroundScanPeriod(1000l);
//mBeaconManager.setBackgroundScanPeriod(0l);

//Wait every SCAN_PERIOD_INBETWEEN time
mBeaconManager.setForegroundBetweenScanPeriod(0l);

//Update default time with the new one
mBeaconManager.updateScanPeriods();
}
catch (RemoteException e){
e.printStackTrace();
}

//Set Monitoring
mBeaconManager.setMonitorNotifier(new MonitorNotifier() {
@Override
public void didEnterRegion(Region region) {
Log.d("TEST", "ENTERED beacon region");

//Start Raning as soon as you detect a beacon
try {
mBeaconManager.startRangingBeaconsInRegion(mRegion);
}
catch (RemoteException e) {
e.printStackTrace();
}
}

@Override
public void didExitRegion(Region region) {
Log.d("TEST", "EXITED beacon region");
}

@Override
public void didDetermineStateForRegion(int state, Region region) {
Log.d("TEST", "SWITCHED from seeing/not seeing beacon to state " + state);
}
});

//Set Ranging
mBeaconManager.setRangeNotifier(new RangeNotifier() {
@Override
public void didRangeBeaconsInRegion(final Collection<Beacon> beacons, Region region) {
if (beacons != null && beacons.size() > 0) {
getActivity().runOnUiThread(new Runnable() {
@Override
public void run() {
beaconBaseAdapter.initAll(beacons);
}
});
}
}
});

try {
//Start Monitoring
mBeaconManager.startMonitoringBeaconsInRegion(mRegion);
}
catch (RemoteException e) {
e.printStackTrace();
}

}

@Override
public Context getApplicationContext() {
return getActivity().getApplicationContext();
}

@Override
public void unbindService(ServiceConnection serviceConnection) {
getActivity().unbindService(serviceConnection);
}

@Override
public boolean bindService(Intent intent, ServiceConnection serviceConnection, int mode) {
return getActivity().bindService(intent, serviceConnection, mode);
}
}


And here is the custom adapter:

public class BeaconBaseAdapter extends BaseAdapter {

private Context myContext;

private LayoutInflater inflater;

public static ArrayList<Beacon> beacons;

public BeaconBaseAdapter(Context context) {
this.myContext = context;
this.inflater = LayoutInflater.from(context);
this.beacons = new ArrayList<Beacon>();
}

public void initAll(Collection<Beacon> newBeacons) {
this.beacons.clear();
this.beacons.addAll(newBeacons);
notifyDataSetChanged();
}

@Override
public int getCount() {
return beacons.size();
}

@Override
public Beacon getItem(int position) {
return beacons.get(position);
}

@Override
public long getItemId(int position) {
return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

if (convertView == null) {
convertView = inflater.inflate(R.layout.beacon_list_row, null);
convertView.setTag(new ViewHolder(convertView));
}

bind(getItem(position), position, convertView);
return convertView;
}


private void bind(Beacon beacon, int position, View view) {
ViewHolder holder = (ViewHolder) view.getTag();

holder.manufacturerTextView.setText("Manufacturer: " + beacon.getManufacturer());
holder.idOneTextView.setText("UUID: " + beacon.getId1());
holder.idTwoTextView.setText("Major: " + beacon.getId2());
holder.idThreeTextView.setText("Minor: " + beacon.getId3());
holder.txPowerTextView.setText("TX-Power: " + beacon.getTxPower());
holder.rssiTextView.setText("RSSI: " + beacon.getRssi());
holder.distanceTextView.setText(String.format("DISTANCE: (%.2f m)", beacon.getDistance()));
holder.nameTextView.setText("Bluetooth Name: " + beacon.getBluetoothName());
holder.addressTextView.setText("Bluetooth Adrs: " + beacon.getBluetoothAddress());
}

static class ViewHolder {
final TextView nameTextView;
final TextView manufacturerTextView;
final TextView idOneTextView;
final TextView idTwoTextView;
final TextView idThreeTextView;
final TextView txPowerTextView;
final TextView rssiTextView;
final TextView distanceTextView;
final TextView addressTextView;

ViewHolder(View view) {
nameTextView = (TextView) view.findViewWithTag("name");
manufacturerTextView = (TextView) view.findViewWithTag("manufacturer");
idOneTextView = (TextView) view.findViewWithTag("id_one");
idTwoTextView = (TextView) view.findViewWithTag("id_two");
idThreeTextView = (TextView) view.findViewWithTag("id_three");
txPowerTextView = (TextView) view.findViewWithTag("tx_power");
rssiTextView = (TextView) view.findViewWithTag("rssi");
distanceTextView = (TextView) view.findViewWithTag("distance");
addressTextView = (TextView) view.findViewWithTag("address");
}
}
}

Answer

OK, I finally solved it. I ordered according to the beacon MAC address. So instead of:

public void initAll(Collection<Beacon> newBeacons) {
    this.beacons.clear();
    this.beacons.addAll(newBeacons);
}

I did:

public void initAll(Collection<Beacon> newBeacons) {

    this.beacons.clear();
    this.beacons.addAll(newBeacons);

    //Sort
    Collections.sort(this.beacons, new Comparator<Beacon>() {
        @Override
        public int compare(Beacon b1, Beacon b2) {
            String mac1 = b1.getBluetoothAddress();
            String mac2 = b2.getBluetoothAddress();

            return mac1.compareTo(mac2);
        }
    });
}
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