si dovrà utilizzare un class per il monitoraggio scherma:
public class GeofenceReceiver extends BroadcastReceiver {
Context context;
Intent broadcastIntent = new Intent();
@Override
public void onReceive(Context context, Intent intent) {
this.context = context;
broadcastIntent.addCategory(GeofenceUtils.CATEGORY_LOCATION_SERVICES);
if (LocationClient.hasError(intent)) {
handleError(intent);
} else {
handleEnterExit(intent);
}
}
private void handleError(Intent intent){
// Get the error code
int errorCode = LocationClient.getErrorCode(intent);
// Get the error message
String errorMessage = LocationServiceErrorMessages.getErrorString(
context, errorCode);
// Log the error
Log.e(GeofenceUtils.APPTAG,
context.getString(R.string.geofence_transition_error_detail,
errorMessage));
// Set the action and error message for the broadcast intent
broadcastIntent
.setAction(GeofenceUtils.ACTION_GEOFENCE_ERROR)
.putExtra(GeofenceUtils.EXTRA_GEOFENCE_STATUS, errorMessage);
// Broadcast the error *locally* to other components in this app
LocalBroadcastManager.getInstance(context).sendBroadcast(
broadcastIntent);
}
private void handleEnterExit(Intent intent) {
// Get the type of transition (entry or exit)
int transition = LocationClient.getGeofenceTransition(intent);
// Test that a valid transition was reported
if ((transition == Geofence.GEOFENCE_TRANSITION_ENTER)
|| (transition == Geofence.GEOFENCE_TRANSITION_EXIT)) {
// Post a notification
List<Geofence> geofences = LocationClient
.getTriggeringGeofences(intent);
String[] geofenceIds = new String[geofences.size()];
String ids = TextUtils.join(GeofenceUtils.GEOFENCE_ID_DELIMITER,
geofenceIds);
String transitionType = GeofenceUtils
.getTransitionString(transition);
for (int index = 0; index < geofences.size(); index++) {
Geofence geofence = geofences.get(index);
...do something with the geofence entry or exit. I'm saving them to a local sqlite db
}
// Create an Intent to broadcast to the app
broadcastIntent
.setAction(GeofenceUtils.ACTION_GEOFENCE_TRANSITION)
.addCategory(GeofenceUtils.CATEGORY_LOCATION_SERVICES)
.putExtra(GeofenceUtils.EXTRA_GEOFENCE_ID, geofenceIds)
.putExtra(GeofenceUtils.EXTRA_GEOFENCE_TRANSITION_TYPE,
transitionType);
LocalBroadcastManager.getInstance(MyApplication.getContext())
.sendBroadcast(broadcastIntent);
// Log the transition type and a message
Log.d(GeofenceUtils.APPTAG, transitionType + ": " + ids);
Log.d(GeofenceUtils.APPTAG,
context.getString(R.string.geofence_transition_notification_text));
// In debug mode, log the result
Log.d(GeofenceUtils.APPTAG, "transition");
// An invalid transition was reported
} else {
// Always log as an error
Log.e(GeofenceUtils.APPTAG,
context.getString(R.string.geofence_transition_invalid_type,
transition));
}
}
//Posts a notification in the notification bar when a transition
private void sendNotification(String transitionType, String locationName) {
// Create an explicit content Intent that starts the main Activity
Intent notificationIntent = new Intent(context, MainActivity.class);
// Construct a task stack
TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
// Adds the main Activity to the task stack as the parent
stackBuilder.addParentStack(MainActivity.class);
// Push the content Intent onto the stack
stackBuilder.addNextIntent(notificationIntent);
// Get a PendingIntent containing the entire back stack
PendingIntent notificationPendingIntent = stackBuilder
.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
// Get a notification builder that's compatible with platform versions
// >= 4
NotificationCompat.Builder builder = new NotificationCompat.Builder(
context);
// Set the notification contents
builder.setSmallIcon(R.drawable.ic_notification)
.setContentTitle(transitionType + ": " + locationName)
.setContentText(
context.getString(R.string.geofence_transition_notification_text))
.setContentIntent(notificationPendingIntent);
// Get an instance of the Notification manager
NotificationManager mNotificationManager = (NotificationManager) context
.getSystemService(Context.NOTIFICATION_SERVICE);
// Issue the notification
mNotificationManager.notify(0, builder.build());
}
è necessario creare gli ascoltatori per ognuna delle aree che si desidera per monitorare, diciamo listener1 e listener2. Per ottimizzare entrambe le aree e integrarlo, l'approccio migliore consiste nel creare una griglia utilizzando MongoDB, che in tal caso consente anche di integrare più di due punti mentre si costruisce una griglia.
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Supponendo che si sta andando ad uscire un poligono in forma di alcuni punti di Lat-Lon, allora si può generare un grid come la seguente:
# Method to get the min and max values for the polygon
def get_bounding_box(coords)
# get max and min coords
max = coords.inject({lat:0, lon:0}) do |max, c|
max[:lon] = c[0] if c[0] > max[:lon]
max[:lat] = c[1] if c[1] > max[:lat]
max
end
min = coords.inject({lat:MAX_LAT, lon:MAX_LON}) do |min, c|
min[:lon] = c[0] if c[0] < min[:lon]
min[:lat] = c[1] if c[1] < min[:lat]
min
end
# add a little padding to the max and min
max.each {|k, v| max[k] += 1 }
min.each {|k, v| min[k] -= 1 }
{min: min, max: max}
end
def generate_grid(bounds)
lon_range = bounds[:min][:lon]...bounds[:max][:lon]
lat_range = bounds[:min][:lat]...bounds[:max][:lat]
grid = []
lon_range.each do |lon|
lat_range.each do |lat|
grid << [lon + 0.25, lat + 0.25]
grid << [lon + 0.25, lat + 0.75]
grid << [lon + 0.75, lat + 0.25]
grid << [lon + 0.75, lat + 0.75]
end
end
grid
end
Tale approccio consente a realizzare very efficient geofencing con reti intelligenti per il monitoraggio di aree di destinazione:
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Più recentemente MongoDB ha anche aggiunto il supporto per Android, fornendo così un modo semplice per l'integrazione del back-end dell'app Android. Si prevede che lo sviluppo di geofencing con dati distribuiti intelligenti abbia un numero crescente di applications.
Sì, questo è molto possibile, ora devi applicare l'Unione qui per ottenere i luoghi comuni ei luoghi noti sotto la circonferenza e il sottoinsieme per ottenere i luoghi comuni di due circonferenze. Ora puoi utilizzare la distanza dal punto centrale e applicare la formula della distanza. –
puoi elaborare la tua risposta un po 'di più.thanx @jitainsharma – Pankaj