问题
I'm currently trying to make an app that will show you a position on a map whilst also saving it to Firebase for later use.
This is my MapsActivity:
public class MapsActivity extends AppCompatActivity
implements OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener, LocationListener {
GoogleMap googleMap;
LocationRequest mLocationRequest;
GoogleApiClient mGoogleApiClient;
Marker marker;
Intent intent;
DatabaseReference myRef;
FirebaseDatabase database;
Longlat longlat;
private static final String TAG ="PvCOS";
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
intent = getIntent();
buildGoogleApiClient();
mGoogleApiClient.connect();
database = FirebaseDatabase.getInstance();
myRef = database.getReference();
}
//class to be sent to db
public class Longlat {
public double longitude;
public double latitude;
public Longlat() {
// Default constructor required for calls to DataSnapshot.getValue(longlat.class)
}
public Longlat(Double longitude, Double latitude) {
this.longitude = longitude;
this.latitude = latitude;
}
}
protected synchronized void buildGoogleApiClient() {
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
@Override
public void onMapReady(GoogleMap map) {
googleMap = map;
setUpMap();
}
public void setUpMap() {
try {
googleMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
googleMap.setMyLocationEnabled(true);
googleMap.getUiSettings().setZoomControlsEnabled(true);
} catch (SecurityException se){
// TODO: 20/09/2016 handle exception
}
}
@Override
public void onConnected(Bundle bundle) {
try {
mLocationRequest = new LocationRequest();
mLocationRequest.setInterval(10);
mLocationRequest.setFastestInterval(10);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
} catch (SecurityException se){
// TODO: 20/09/2016 handle exception
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onLocationChanged(Location location) {
//save to server
longlat = new Longlat(location.getLongitude(),location.getLatitude());
myRef.child("users").child(intent.getStringExtra("name")).setValue(longlat);
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
marker = googleMap.addMarker(new MarkerOptions()
.position(latLng)
.title(intent.getStringExtra("name"))
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
}
protected void onStop() {
//unregister location updates
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
//remove previously placed Marker
if (marker != null) {
marker.remove();
}
super.onStop();
}
}
When I run it, I get a white screen and this error in logcat:
09-20 13:18:25.206 21875-21875/grp6.PvCOS E/UncaughtException: java.lang.StackOverflowError: stack size 8MB
at java.lang.reflect.Method.invoke(Native Method)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.internal.zzaln.zzbw(Unknown Source)
at com.google.android.gms.internal.zzaln.zzcd(Unknown Source)
at com.google.android.gms.internal.zzaln$zza.zzce(Unknown Source)
at com.google.android.gms.inter
Pretty sure its the Firebase part that's causing the error, as I found another thread about someone trying to send a picture over Firebase which was too big, but all I'm sending is a simple object.
回答1:
You must have reference to the Node of JSON tree in firebase. kindly check this code.
FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference myRef = database.getReference("PvCOS/users");
回答2:
I have experienced the same problem : StackOverflow Exception while trying to save my object using saveValue method.
But in my case problem was not because of wrong reference but because of using Android's Uri object as a field of my class. Firebase can't save them, so I was forced to replace them with String.
回答3:
I had just misunderstood how you create new children in Firebase.
I tried to add them with .child()
myRef = database.getReference("PvCOS/users");
myRef.child("users").child(intent.getStringExtra("name")).setValue(longlat);
But I should have just added the children when getting my reference:
myRef = database.getReference("PvCOS/users"+name);
myRef.setValue(longlat);
来源：https://stackoverflow.com/questions/39593122/stackoverflowerror-when-using-firebase