继续触发GeoFence事件

Question

GeoFence triggering issue

I have setup geofence in my app, I am using IntetnService for the handle trigger event.

My issue is with trigger event many time.

Suppose i am at 1 Location inside Geofence, unfortunately some time enter or exit event trigger, Then i do like check the geoEvent.getTriggerdLocation() properties and check with geo fence radius,

if the trigger location to geo fence location distance greater then geofecen radius then an then i will release my exit event functionality,

but eventually geofence trigger event 2 3 km far even i already entered in fence and my above logic will fail. see snap

i want some solid fix for these.

Location is on with High priority

this will happening more when i will near to border of fence

Add geo fence list, as of now i am using only one fence.

mGeofenceList.add(new Geofence.Builder().setRequestId(String.valueOf(loGeoFenceModels.liGeoFenceID))
                    .setCircularRegion(loGeoFenceModels.ldGeoLatitude, loGeoFenceModels.ldGeoLongitude,
                            loGeoFenceModels.lfRadius)
                    .setExpirationDuration(Geofence.NEVER_EXPIRE)
                    .setTransitionTypes(Geofence.GEOFENCE_TRANSITION_ENTER | Geofence.GEOFENCE_TRANSITION_EXIT)
                    .build());

PendidngIntentService

moGeofencePendingIntent = getGeofencePendingIntent();
        LocationServices.GeofencingApi
                .addGeofences(moLocationClient, getGeofencingRequest(), moGeofencePendingIntent)
                .setResultCallback(this);

getGeofencingRequest() AND moGeofencePendingIntent

private GeofencingRequest getGeofencingRequest() {
    return new GeofencingRequest.Builder().setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER)
            .addGeofences(mGeofenceList).build();
}



private PendingIntent getGeofencePendingIntent() {
    // Reuse the PendingIntent if we already have it.
    if (moGeofencePendingIntent != null) {
        return moGeofencePendingIntent;
    }

    Intent intent = new Intent(moContext, GeofenceTransitionsIntentService.class);
    // We use FLAG_UPDATE_CURRENT so that we get the same pending intent
    // back when calling addgeoFences()
    return PendingIntent.getService(moContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
}

GeofenceTransitionsIntentService.class

import java.util.ArrayList;
import java.util.List;
import com.google.android.gms.location.Geofence;
import com.google.android.gms.location.GeofenceStatusCodes;
import com.google.android.gms.location.GeofencingEvent;
import android.R.bool;
import android.app.IntentService;
import android.app.usage.UsageEvents.Event;
import android.content.Intent;
import android.database.Cursor;
import android.location.Location;
import android.text.TextUtils;

public class GeofenceTransitionsIntentService extends IntentService {

protected static final String TAG = "GeofenceTransitionsIS";

public GeofenceTransitionsIntentService() {
    super(TAG); // use TAG to name the IntentService worker thread
}

@Override
public void onDestroy() {
    // TODO Auto-generated method stub
    super.onDestroy();
}

private static String getGeofenceTransitionDetails(GeofencingEvent event) {
    String transitionString = GeofenceStatusCodes.getStatusCodeString(event.getGeofenceTransition());
    List<String> triggeringIDs = new ArrayList<String>();
    for (Geofence geofence : event.getTriggeringGeofences()) {
        triggeringIDs.add(geofence.getRequestId());
    }
    return String.format("%s: %s", transitionString, TextUtils.join(", ", triggeringIDs));
}

@Override
protected void onHandleIntent(Intent intent) {

    GeofencingEvent event = GeofencingEvent.fromIntent(intent);
    Log.i(TAG, "Geofencing Event : " + event);
    if (event.hasError()) {
        Log.i(TAG, "GeofencingEvent Error : " + event.getErrorCode());
        return;
    }

    // Get the type of transition (entry or exit)
    if (event.getGeofenceTransition() == Geofence.GEOFENCE_TRANSITION_ENTER) {
        Log.i(TAG, "GeofencingEvent Enter");
    }
    if (event.getGeofenceTransition() == Geofence.GEOFENCE_TRANSITION_EXIT) {
        Log.i(TAG, "GeofencingEvent Exit");
    ?
    String description = getGeofenceTransitionDetails(event);
    Log.i(TAG, "GeofencingEvent description : " + description);
}

}

Permissions

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.hardware.location.gps" />

i stuck in this issue since many days, please help to finish the issue.

Answer 1

Here is the points you should keep in mind when use Geofence in Application

From official documentation

• Choose the optimal radius for your geofence

For best results, the minimium radius of the geofence should be set between 100 - 150 meters. When Wi-Fi is available location accuracy is usually between 20 - 50 meters. When indoor location is available, the accuracy range can be as small as 5 meters. Unless you know indoor location is available inside the geofence, assume that Wi-Fi location accuracy is about 50 meters.

When Wi-Fi location is not available (for example, when you are driving in rural areas) the location accuracy degrades. The accuracy range can be as large as several hundred meters to several kilometers. In cases like this, you should create geofences using a larger radius.

• Use the dwell transition type to reduce alert spam

If you receive a large number of alerts when driving briefly past a geofence, the best way to reduce the alerts is to use a transition type of GEOFENCE_TRANSITION_DWELL instead of GEOFENCE_TRANSITION_ENTER. This way, the dwelling alert is sent only when the user stops inside a geofence for a given period of time. You can choose the duration by setting a loitering delay.

Answer 2

Found one patch to avoid unwanted or dummy events.

you can get location on trigger time

Location loTriggerGeoFenceLocation = moEvent.getTriggeringLocation();
long ldAccuracy = loTriggerGeoFenceLocation.getAccuracy();

now store your geo fence location lat long and radius. not get trigger lat long and check the distance between trigger location and geo fence location lat long. if the distance are less then radius it should be the enter and is distance is more then radius it should be exit event

 if (event.getGeofenceTransition() == Geofence.GEOFENCE_TRANSITION_EXIT) {

    ldGeoLatLong = moSharedPreferenceManager.getGeoFenceTimeLocation();
    Location loExistGeoFenceLocation = new Location("");
    loExistGeoFenceLocation.setLatitude(ldGeoLatLong[0]);
    loExistGeoFenceLocation.setLongitude(ldGeoLatLong[1]);

    String lsRadius = moSharedPreferenceManager.getGeoFenceRadius();
    float lfRadius = Float.parseFloat(lsRadius);
        Log.i(TAG, "GeofencingEvent Exit");
        float lfDistance = loTriggerGeoFenceLocation.distanceTo(loExistGeoFenceLocation);
        if (lfDistance >= lfRadius && ldAccuracy <= 100f) {
            moSharedPreferenceManager.setGeoFenceExit(true);
        }
}