// LocationListener impl
@Override
public void onLocationChanged(Location location) {
String topic = topic(location);
if (!topic.equals(currentTopic)) {
Log.d(LOG_TAG, "new grid location: " + topic);
if (sendInfectionMessage(true)) {
currentTopic = topic;
subscribeToCurrentTopic();
}
}
int thisRegion = calcRegionCode(location);
if (thisRegion != region || bioHazards.isEmpty()) {
Log.d(
LOG_TAG,
"new region or no biohazards in region " + thisRegion + " - generating biohazards");
region = thisRegion;
createBiohazards(location);
EventBus.getDefault().post(new MapEvent(MapEvent.Type.REGION_UPDATED, region, bioHazards));
}
for (Biohazard b : bioHazards) {
if (b.getLocation().distanceTo(location) < BIOHAZARD_INFECTION_RADIUS) {
Virus v = VirusFactory.fromBiohazard(b.getSeed(), b.getId());
if (gameDatabase.findVirus(v.getId()) == null) {
Log.d(LOG_TAG, "infection by approaching biohazard " + b.getId());
gameDatabase.addVisitedBiohazard(b.getId());
addVirus(v);
}
}
}
}
@Override
public void onCreate() {
super.onCreate();
vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
gameDatabase = new GameDatabase(this);
// init game DB
if (gameDatabase.getViruses().isEmpty()) {
Virus v = VirusFactory.createMutation(null);
Log.d(LOG_TAG, "new virus: " + v.getId());
gameDatabase.addVirus(v);
EventBus.getDefault().post(new GameEvent(GameEvent.Type.NEW_VIRUS, v.getId(), 0));
}
clientId = gameDatabase.getSetting("clientId", null);
if (clientId == null) {
clientId = UUID.randomUUID().toString();
gameDatabase.putSetting("clientId", clientId);
Log.i(LOG_TAG, "persisted new clientId: " + clientId);
}
// MQTT
mqttClient = new MqttAndroidClient(this, BROKER_URI, clientId);
mqttClient.setCallback(this);
// Location
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER))
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_LOCATION_UPDATE_INTERVAL_MS,
MIN_LOCATION_UPDATE_DISTANCE_M,
this);
else
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_LOCATION_UPDATE_INTERVAL_MS,
MIN_LOCATION_UPDATE_DISTANCE_M,
this);
findBestLastLocation();
try {
MqttConnectOptions options = new MqttConnectOptions();
options.setKeepAliveInterval(0); // no keepalive pings
mqttClient.connect(options, null, this);
Log.d(LOG_TAG, "connected to MQTT broker as " + clientId);
} catch (MqttException e) {
Log.e(LOG_TAG, "could not connect to MQTT broker at " + BROKER_URI);
}
EventBus.getDefault().register(this);
}
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
if (topic.equals(currentTopic)) {
String msg = new String(message.getPayload());
Log.v(LOG_TAG, "mqtt message arrived: " + msg);
// process message
JSONObject o = new JSONObject(msg);
String sender = o.optString("sender", null);
// ignore our own messages, so check sender
if (sender != null && !sender.equals(clientId)) {
// somebody else sent their viruses
JSONArray a = o.getJSONArray("viruses");
for (int i = 0; i < a.length(); i++) {
Virus v = VirusFactory.fromJSON(a.getJSONObject(i));
addVirus(v);
}
// was the other user just entering our region?
if (o.optString("entering", null) != null) {
// send our infection
sendInfectionMessage(false);
}
}
}
}