So I have an app that caches geopoints per user and then saves it on Parse.com and then updates my map with last known coordinates of all users. But it crashes and I can't find the reason why. It will work with manually input lats and longitudes, but not caches current lats and long.
This is my method for it;
public class MapActivity extends FragmentActivity implements LocationProvider.LocationCallback {
public static final String TAG = MapActivity.class.getSimpleName();
ParseUser currentUser = ParseUser.getCurrentUser();
private GoogleMap mMap; // Might be null if Google Play services APK is not available.
private LocationProvider mLocationProvider;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
setUpMapIfNeeded();
mLocationProvider = new LocationProvider(this, this);
}
@Override
protected void onResume() {
super.onResume();
setUpMapIfNeeded();
mLocationProvider.connect();
}
@Override
protected void onPause() {
super.onPause();
mLocationProvider.disconnect();
}
private void setUpMapIfNeeded() {
// Do a null check to confirm that we have not already instantiated the map.
if (mMap == null) {
// Try to obtain the map from the SupportMapFragment.
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
// Check if we were successful in obtaining the map.
if (mMap != null) {
setUpMap();
}
}
}
private void setUpMap() {
//mMap.addMarker(new MarkerOptions().position(new LatLng(0, 0)).title("Marker"));
}
public void handleNewLocation(Location location) {
Log.d(TAG, location.toString());
double currentLatitude = location.getLatitude();
double currentLongitude = location.getLongitude();
LatLng latLng = new LatLng(currentLatitude, currentLongitude);
currentUser.put("lat", currentLatitude);
currentUser.put("lng", currentLongitude);
currentUser.saveInBackground();
ParseGeoPoint point = new ParseGeoPoint(currentLatitude, currentLongitude);
currentUser.put("location", point);
ParseQuery<ParseUser> queryParseUser = ParseUser.getQuery();
queryParseUser.findInBackground(new FindCallback<ParseUser>() {
@Override
public void done(List<ParseUser> locationList, ParseException arg1) {
// TODO Auto-generated method stub
if (locationList != null && arg1 == null) {
for (ParseUser parseObject : locationList) {
ParseGeoPoint parseGeoPoint = parseObject.getParseGeoPoint("location");
// laver marker
MarkerOptions marker = new MarkerOptions().position(
new LatLng(parseGeoPoint.getLatitude(), parseGeoPoint.getLongitude())).title(parseObject.getUsername());
// BitmapDescriptorFactory.defaultMarker();
// adder marker
mMap.addMarker(marker);
}
}
else {
Log.d("Lokation", "Fejl i returnering af data: " + arg1.toString());
}
}
});
}
}
}
Android reports errors here;
new LatLng(parseGeoPoint.getLatitude(), parseGeoPoint.getLongitude())).title(parseObject.getUsername());
and here
queryParseUser.findInBackground(new FindCallback<ParseUser>() {
09-25 01:06:31.092 8413-8413/com.example.nan.spymap E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.nan.spymap, PID: 8413
java.lang.NullPointerException: Attempt to invoke virtual method 'double com.parse.ParseGeoPoint.getLatitude()' on a null object reference
at com.example.nan.spymap.MapActivity$1.done(MapActivity.java:126)
at com.example.nan.spymap.MapActivity$1.done(MapActivity.java:113)
at com.parse.ParseTaskUtils$2$1.run(ParseTaskUtils.java:115)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Really stuck on this, any help would be appreciated.:(