Comments by sfdgasdfqqqq

sfdgasdfqqqq 20-Mar-19 12:36pm View

Intent toMap = new Intent(context,MapActivity.class);
Bundle coords = new Bundle();
coords.putDouble("lat",lcoords);
coords.putDouble("lon",lcoords2);
context.startActivity(toMap);

This is my Bundle, coords.

sfdgasdfqqqq 20-Mar-19 12:11pm View

if I am going to use getExtras(), the getDOuble on this code produces a null pointer exception.

double lat1 = coords.getDouble("lat");

sfdgasdfqqqq 20-Mar-19 11:40am View

I am passing a Double data type. I inserted this code:

Intent toMap = new Intent(context,MapActivity.class);
Bundle coords = new Bundle();
coords.putDouble("lat",lcoords);
coords.putDouble("lon",lcoords2);
toMap.putExtras(coords);
context.startActivity(toMap);

System.out.print(coords);

lcoords contains the latitude. lcoords2 contains the longitude. Whenever I access the Bundle to my MapActivity.class, it says "getDouble on a null object reference"

Bundle coords = getIntent().getBundleExtra("coords");
double lat1 = coords.getDouble("lat");
double lon2 = coords.getDouble("lon");

LatLng location = new LatLng(lat1,lon2);
marker = mMap.addMarker(new MarkerOptions()
.position(location)
.title("Here")
.flat(true));

mMap.moveCamera(CameraUpdateFactory.newLatLng(location));

If I comment out those codes, lcoords and lcoords2 have values and is not null.

sfdgasdfqqqq 20-Mar-19 10:41am View

Also, I tried using Intent but it says, cannot resolve constructor. Maybe because, SmsReceiver is only a class, not an activity itself.

sfdgasdfqqqq 20-Mar-19 10:31am View

Hello. This is what I have tried but I am getting a NullObjectReference error on my LatLng.

HashMap <string, double=""> hashMap = smsReceiver.getLocMap(coordinates);
if(hashMap != null) {
// Double lat = hashMap.get("latitude");
// Double lon = hashMap.get("longitude");

LatLng location = new LatLng(coordinates.get("latitude"),coordinates.get("longitude"));
marker = mMap.addMarker(new MarkerOptions()
.position(location)
.title("Here")
.flat(true));

mMap.moveCamera(CameraUpdateFactory.newLatLng(location));

This is my a class with my hashmap.
//variable
private HashMap<string, double=""> coordinates = new HashMap<string, double="">();

public void sendDataToFirebase(SmsMessage sms, Context context) {
coordinates.put("latitude", latitudedb);
coordinates.put("longitude", longitudedb);
mRef.setValue(coordinates);

Double lcoords = coordinates.get("latitude");
Double lcoords2 = coordinates.get("longitude");

mRef.getKey();

System.out.println(lcoords);
System.out.println(lcoords2);

// }

}

public HashMap<string, double=""> getLocMap(HashMap<string, double=""> coordinates) {
return this.coordinates;

}

When I print out my coordinates, it has the values.

sfdgasdfqqqq 18-Mar-19 12:24pm View

I followed a tutorial. I am new to Android programming.

This is how I am accessing the LocationArray.class

for(DataSnapshot s: dataSnapshot.getChildren()) {
LocationArray locationArray = s.getValue(LocationArray.class);
LatLng location = new LatLng(locationArray.latitude,locationArray.longitude);
mMap.addMarker(new MarkerOptions().position(location).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_VIOLET)));

And this is where I get a "May produce NullPointerException". What seems to be the problem?

LatLng(locationArray.latitude,locationArray.longitude);

This is my LocationArray.class

public class LocationArray {

public LocationArray() {
//Default Constructor

}

public String date;
public String recipient;
public double latitudedb;
public double longitudedb;

public LocationArray(String date, String recipient, double latituddbe, double longitudedb) {
this.date = date;
this.recipient = recipient;
this.latitudedb = latitudedb;
this.longitudedb = longitudedb;
}

}

sfdgasdfqqqq 18-Mar-19 12:12pm View

Deleted

This is my code on displaying a marker on google maps but the datasnapshot is not getting the value from my LocationArray.class

public void onMapReady(GoogleMap googleMap) {

mMap = googleMap;

googleMap.setOnMarkerClickListener(this);
googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
mChild.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {

for(DataSnapshot s: dataSnapshot.getChildren()) {
LocationArray locationArray = s.getValue(LocationArray.class);
LatLng location = new LatLng(locationArray.latitude,locationArray.longitude);
mMap.addMarker(new MarkerOptions().position(location).icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_VIOLET)));

Log.e("MAP OPERATIONS:","Marker has been added to updated location");
}
}

@Override
public void onCancelled(@NonNull DatabaseError databaseError) {

}
});
}

sfdgasdfqqqq 18-Mar-19 12:10pm View

I can now display a marker on the map but it does not read the last inserted row from Firebase database. https://stackoverflow.com/questions/55224838/android-may-produce-nullpointerexception-on-array-class You may check this link because I have provided pictures and details so you can understand me.

sfdgasdfqqqq 18-Mar-19 12:01pm View

I have displayed the marker. But it seems like my array class is returning a null value. https://stackoverflow.com/questions/55224838/android-may-produce-nullpointerexception-on-array-class You may check this link for further details. I hope you can help me.

sfdgasdfqqqq 18-Mar-19 12:01pm View

I have displayed the marker. But it seems like my array class is returning a null value. https://stackoverflow.com/questions/55224838/android-may-produce-nullpointerexception-on-array-class You may check this link for further details. I hope you can help me.

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