java.lang.IllegalStateException: Not on the main thread Google Maps

Question

I am getting the above error when my Android app code receives data from a cloud messaging platform and I try to put that data on the map -

    java.lang.IllegalStateException: Not on the main thread
    at maps.w.c.a(Unknown Source)
    at maps.y.F.a(Unknown Source)
    at maps.ad.u.b(Unknown Source)
    at vo.onTransact(:com.google.android.gms.DynamiteModulesB:92)
    at android.os.Binder.transact(Binder.java:380)
    at com.google.android.gms.maps.internal.IGoogleMapDelegate$zza$zza.animateCamera(Unknown Source)
    at com.google.android.gms.maps.GoogleMap.animateCamera(Unknown Source)
    at com.pabba.mtracker.tracking.view.TrackingActivity.onLocationReceived(TrackingActivity.java:54)

The following is the code that is called by my presenter (I am using MVP Pattern for my android app) when it receives a Location message from the Cloud Messaging service.

@Override
public void onLocationReceived(LatLng latLng) {
    Log.i(TAG, latLng.toString());
    mGoogleMap.addPolyline(new PolylineOptions().add(latLng));
    mGoogleMap.animateCamera(CameraUpdateFactory.newCameraPosition(new CameraPosition.Builder().target(latLng)
            .zoom(13).build()));
}

And the error is occurring in the addPolyLine function call. Please tell me what can be done to resolve it.

Answer 1

you must run this code in the UIThread:

activity.runOnUIThread(new Runnable(){
    public void run(){
        mGoogleMap.addPolyline(new PolylineOptions().add(latLng));
        mGoogleMap.animateCamera(CameraUpdateFactory.newCameraPosition(new CameraPosition.Builder().target(latLng)
        .zoom(13).build()));
    }
});