/** Notifies the listener about possible region-based events */
private void notifyListener() {
IBeacon newNearestBeacon = null;
if (_arrOrderedIBeacons.size() > 0) newNearestBeacon = _arrOrderedIBeacons.get(0);
// Case 1: enter iBeacon region from nowhere
if (_previousNearestIBeacon == null && newNearestBeacon != null) {
_listener.enterRegion(newNearestBeacon);
_previousNearestIBeacon = newNearestBeacon;
}
// Case 2: keep in the same iBeacon region, update proximity
else if (_previousNearestIBeacon != null
&& newNearestBeacon != null
&& _previousNearestIBeacon.equals(newNearestBeacon)) {
_previousNearestIBeacon = newNearestBeacon;
}
// Case 3: enter a different iBeacon region (roaming)
else if (_previousNearestIBeacon != null
&& newNearestBeacon != null
&& !_previousNearestIBeacon.equals(newNearestBeacon)) {
_listener.exitRegion(_previousNearestIBeacon);
_listener.enterRegion(newNearestBeacon);
_previousNearestIBeacon = newNearestBeacon;
}
// Case 4: leave iBeacon region
else if (_previousNearestIBeacon != null && newNearestBeacon == null) {
_listener.exitRegion(_previousNearestIBeacon);
_previousNearestIBeacon = null;
}
}
@Override
public void run() {
_scanning = false;
_bluetoothAdapter.stopLeScan(mLeScanCallback);
if (_arrOrderedIBeacons.size() == 0) _listener.searchState(SEARCH_END_EMPTY);
else _listener.searchState(SEARCH_END_SUCCESS);
notifyListener();
}
/**
* Starts or stops the scanning process looking for iBeacons
*
* @param enable <code>true</code> to start scanning, <code>false</code> to stop the scanning
* process
*/
public void scanIBeacons(final boolean enable) {
if (enable) {
// Stops scanning after a pre-defined scan period.
_timeoutHandler = new Handler();
_timeoutHandler.postDelayed(timeoutTask, IBeaconProtocol.SCANNING_PERIOD);
_scanning = true;
_arrOrderedIBeacons.clear();
_bluetoothAdapter.startLeScan(mLeScanCallback);
_listener.searchState(SEARCH_STARTED);
} else {
_scanning = false;
_bluetoothAdapter.stopLeScan(mLeScanCallback);
_listener.searchState(SEARCH_END_SUCCESS);
}
// Cannot obtain error status=133 this way
Log.i(
Utils.LOG_TAG,
"The status:" + _bluetoothAdapter.getProfileConnectionState(BluetoothProfile.GATT));
}
@Override
public void onLeScan(final BluetoothDevice device, int rssi, byte[] scanRecord) {
Log.i(Utils.LOG_TAG, "BLE packet received");
IBeacon newBeacon = parseAdvertisementData(scanRecord);
if (newBeacon == null) return;
newBeacon.setMacAddress(device.getAddress());
// If already discovered, then just refresh the RSSI of the existing instance and return
if (_arrOrderedIBeacons.contains(newBeacon)) {
double newDistance = calculateDistance(newBeacon.getPowerValue(), rssi);
IBeacon previousIBeaconInfo = findIfExists(newBeacon);
double oldDistance = previousIBeaconInfo.getProximity();
if (newDistance < oldDistance) {
Log.i(Utils.LOG_TAG, "Updating distance");
previousIBeaconInfo.setProximity(newDistance);
// Sort again
Collections.sort(_arrOrderedIBeacons, new IBeaconProximityComparator());
}
return;
}
newBeacon.setEasiBeacon(false);
if (device.getName() != null) {
Log.e("device.getName()", String.valueOf(device.getName()));
if (device.getName().startsWith(EASIBEACON_IDPREFIX)) {
newBeacon.setEasiBeacon(true);
String version = device.getName().substring(EASIBEACON_IDPREFIX.length());
newBeacon.setVersionModel(version);
if (newBeacon.getVersion() == 1) {
// Version 1 is always connectable
newBeacon.setConnectable(true);
} else if (newBeacon.getVersion() == 2) {
newBeacon.setConnectable(getConnectable(scanRecord));
if (!newBeacon.isConnectable())
newBeacon.setEasiBeacon(false); // If not connectable we will report it as unknown
}
}
}
// Review this
Log.i(
Utils.LOG_TAG,
device.getName()
+ " "
+ device.getAddress()
+ " "
+ newBeacon.getPowerValue()
+ " "
+ rssi
+ " Connectable: "
+ newBeacon.isConnectable());
newBeacon.setProximity(calculateDistance(newBeacon.getPowerValue(), rssi));
if (!_arrOrderedIBeacons.contains(newBeacon)) {
_arrOrderedIBeacons.add(newBeacon);
Collections.sort(_arrOrderedIBeacons, new IBeaconProximityComparator());
_listener.beaconFound(newBeacon);
// Every time a new beacon is found, reset the timeout
_timeoutHandler.removeCallbacks(timeoutTask);
_timeoutHandler.postDelayed(timeoutTask, IBeaconProtocol.SCANNING_PERIOD);
}
}
