如何解决需要获取触发的地理围栏中心的纬度和经度，但哈希地图返回空值
我想检索创建的地理围栏的纬度和经度，在我考虑使用hashMap的GeoFenceBroadcastReceiver.java类中（在这里我将使用地理围栏的ID作为键，然后返回得到地理围栏中心的LatLng作为值），但可惜hashMap为Empty，并且在logcat中检查时返回空值。在MapsActivity.java中的addGeoFence（）中使用geoFenceHelper.setHashmap（在GeoFenceHelper.java中创建的方法）{setHashMap在GeoFenceHelper.java类的底部}，然后在GeoFenceBroadcastReceiver.java中使用getGeoFenceLatLng（String ID）来检索LatLng
再次总结一下，我认为使用hashMap在geofence ID和geofence LatLng之间创建键值对将对我有所帮助，但是hashMap返回的是null，我不希望返回null，但是值（ LatLng）。请解决此问题并在可能的情况下提供帮助。
在MapsActivity.java中
@Override
public void onMapLongClick(LatLng latLng) {
float GEO_FENCE_RADIUS = 300;
addGeoFence(latLng,GEO_FENCE_RADIUS);
}
private void addGeoFence(LatLng latLng,float geo_fence_radius) {
String ID = UUID.randomUUID().toString();
Log.d(TAG,"addGeoFence: String ID generated: " + ID);
Log.d(TAG,"addGeoFence: LatLng latLng generated: " + latLng);
Geofence geofence = geoFenceHelper.getGeoFence(ID,latLng,geo_fence_radius,Geofence.GEOFENCE_TRANSITION_ENTER |
Geofence.GEOFENCE_TRANSITION_DWELL | Geofence.GEOFENCE_TRANSITION_EXIT);
GeofencingRequest geofencingRequest = geoFenceHelper.getGeoFencingRequest(geofence);
PendingIntent pendingIntent = geoFenceHelper.getPendingIntent();
if (ActivityCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) { return; }
geofencingClient.addGeofences(geofencingRequest,pendingIntent)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) { Log.d(TAG,"onSuccess: GeoFence has been added"); }
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
String error = geoFenceHelper.getErrorString(exception);
Log.d(TAG,"onFailure: GeoFence not added " + error); }
});
Log.d(TAG,"addGeoFence: String ID set To GeoFence: " + ID);
Log.d(TAG,"addGeoFence: LatLng latLng set To GeoFence: " + latLng);
geoFenceHelper.setHashMap(ID,latLng); //This will call the setHashMap
}
在GeoFenceHelper.java
中public class GeoFenceHelper extends ContextWrapper {
private static final String TAG = "GeoFenceHelper";
PendingIntent pendingIntent;
HashMap<String,LatLng> hashMap = new HashMap<>();
private static final int PENDING_INTENT_REQUEST_CODE = 234;
public GeoFenceHelper(Context base) { super(base); }
public Geofence getGeoFence(String ID,LatLng latLng,float radius,int TransitionTypes){
return new Geofence.Builder()
.setCircularRegion(latLng.latitude,latLng.longitude,radius)
.setExpirationDuration(Geofence.NEVER_EXPIRE)
.setLoiteringDelay(2000)
.setRequestId(ID)
.setTransitionTypes(TransitionTypes)
.build();
}
public GeofencingRequest getGeoFencingRequest(Geofence geofence){
return new GeofencingRequest.Builder()
.addGeofence(geofence)
.setInitialTrigger(GeofencingRequest.INITIAL_TRIGGER_ENTER)
.build();
}
public PendingIntent getPendingIntent(){
if (pendingIntent != null){ return pendingIntent; }
Intent intent = new Intent(GeoFenceHelper.this,GeoFenceBroadcastReceiver.class);
pendingIntent = PendingIntent.getBroadcast(GeoFenceHelper.this,PENDING_INTENT_REQUEST_CODE,intent,PendingIntent.FLAG_UPDATE_CURRENT);
return pendingIntent;
}
public String getErrorString(Exception e) {
if (e instanceof ApiException) {
ApiException apiException = (ApiException) e;
switch (apiException.getStatusCode()) {
case GeofenceStatusCodes.GEOFENCE_NOT_AVAILABLE:
return "GEO_FENCE NOT AVAILABLE";
case GeofenceStatusCodes.GEOFENCE_TOO_MANY_GEOFENCES:
return "GEO_FENCE TOO MANY GEO_FENCES";
case GeofenceStatusCodes.GEOFENCE_TOO_MANY_PENDING_INTENTS:
return "GEO_FENCE TOO MANY PENDING INTENTS";
}
}
return e.getLocalizedMessage();
}
public LatLng getGeoFenceLatLng(String ID) {
Log.d(TAG,"getGeoFenceLatLng: the Id passed is: " + ID);
if (this.hashMap.isEmpty()){
Log.d(TAG,"getGeoFenceLatLng: HashMap is Empty");
Toast.makeText(this,"HashMap is Empty",Toast.LENGTH_SHORT).show();
}
LatLng latLng = hashMap.get(ID);
Log.d(TAG,"getHashMap: the LatLng in the hashMap is: " + latLng);
return latLng;
}
public void setHashMap(String ID,LatLng latLng) {
this.hashMap.put(ID,latLng);
Log.d(TAG,"setHashMap: ID of the geoFence: " + ID);
Log.d(TAG,"setHashMap: latLng of the geoFence: " + latLng);
}
}
在GeoFenceBroadcastReceiver.java中
public class GeoFenceBroadcastReceiver extends BroadcastReceiver {
private static final String TAG = "GeoFenceBroadcastRec";
Location location;
LatLng latLng;
@Override
public void onReceive(Context context,Intent intent) {
Log.d(TAG,"onReceive: geoFence added");
GeofencingEvent geofencingEvent = GeofencingEvent.fromIntent(intent);
GeoFenceHelper geoFenceHelper = new GeoFenceHelper(context);
NotificationHelper notificationHelper = new NotificationHelper(context);
if (geofencingEvent.hasError()) {
Log.d(TAG,"onReceive: Error receiving geoFence event..." + geofencingEvent.getErrorCode());
return;
}
List<Geofence> geoFenceList = geofencingEvent.getTriggeringGeofences();
for (Geofence geofence: geoFenceList) {
String ID = geofence.getRequestId();
Log.d(TAG,"onReceive: RequestId of the geoFence: " + ID);
latLng = geoFenceHelper.getGeoFenceLatLng(ID);
Log.d(TAG,"onReceive: LatLng in hashMap: " + latLng);
}
location = geofencingEvent.getTriggeringLocation();
Log.d(TAG,"onReceive: user location where it got detected: " + location.getLatitude() + " " + location.getLongitude());
int transitionType = geofencingEvent.getGeofenceTransition();
switch (transitionType) {
case Geofence.GEOFENCE_TRANSITION_ENTER:
Log.d(TAG,"onReceive: " + "GEO_FENCE TRANSITION ENTER");
Toast.makeText(context,"GEO_FENCE TRANSITION ENTER",Toast.LENGTH_SHORT).show();
break;
case Geofence.GEOFENCE_TRANSITION_DWELL:
Log.d(TAG,"onReceive: " + "GEO_FENCE TRANSITION DWELL");
Toast.makeText(context,"GEO_FENCE TRANSITION DWELL",Toast.LENGTH_SHORT).show();
break;
case Geofence.GEOFENCE_TRANSITION_EXIT:
Log.d(TAG,"onReceive: " + "GEO_FENCE TRANSITION EXIT");
Toast.makeText(context,"GEO_FENCE TRANSITION EXIT",Toast.LENGTH_SHORT).show();
break;
}
}
}
如果还有另一种方法可以获取触发的地理围栏的经度和纬度，请告诉我，否则请尝试解决此问题。
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