CODEWITHSUNDEEP
javaandroidgoogle-maps
Charlie
Charlie

Reputation: 1179

Google Maps - Android App not load - null object reference

I am currently trying to develop an Android app with google Maps integration. At the moment I have difficulties to find the error, because the code is from the google site itself, except that it is a SupportMapFragment. If you know an actual tutorial with SupportMapFragment would also be great. Actual, because I think .getMap() is depreciated. If I should post the whole code, let me know (I am new in stackoverflow)

If try to use this code:

import android.content.Context;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapsFragment extends SupportMapFragment implements OnMapReadyCallback {

where a function is:

    @Override
     public void onResume() {
    FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
    SupportMapFragment supportMapFragment = (SupportMapFragment) fragmentManager
            .findFragmentById(R.id.map);

    supportMapFragment.getMapAsync(this);
}

The error is: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.SupportMapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference

The Fragment xml looks like this:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/root"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <fragment
        android:id="@+id/map"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</RelativeLayout>

Upvotes: 3

Views: 13609

Answers (2)

Xjasz
Xjasz

Reputation: 1248

Map fragment is acting up on Lollipop you may need this instead.

SupportMapFragment supportMapFragment;
if (Build.VERSION.SDK_INT < 21) {
    supportMapFragment = (SupportMapFragment) getActivity()
        .getSupportFragmentManager().findFragmentById(R.id.map);
} else {
    supportMapFragment = (SupportMapFragment) getActivity()
        .getChildFragmentManager().findFragmentById(R.id.map);
}
supportMapFragment.getMapAsync(this);

Upvotes: 7

puj
puj

Reputation: 770

It seems like you need to use the Fragment's SupportFragmentManager See the answer to this findFragmentById for SupportMapFragment returns null in Android Studio

Upvotes: 7

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