Google Maps Fragment returning null inside a fragment

Question

So I have an empty fragment that contains a map fragment. Whenever I try to activate the fragment containing the map, my app crashes and returns a null pointer error on this line:

map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                .getMap();

Full Error message:

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.GoogleMap com.google.android.gms.maps.MapFragment.getMap()' on a null object reference
            at com.collusion.serviceassistant.ReturnVisitDetails.onViewCreated(ReturnVisitDetails.java:39)
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:904)
            at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
            at android.app.BackStackRecord.run(BackStackRecord.java:684)
            at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
            at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5001)
            at java.lang.reflect.Method.invoke(Native Method)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)

Here is my fragment code:

import android.app.Activity;
import android.app.Dialog;
import android.net.Uri;
import android.os.Bundle;
import android.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;


public class ReturnVisitDetails extends Fragment {

    static final LatLng HAMBURG = new LatLng(53.558, 9.927);
    static final LatLng KIEL = new LatLng(53.551, 9.993);
    private GoogleMap map;
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_return_visit_add, container, false);
        return rootView;
    }

    public void onViewCreated(View view, Bundle savedInstanceState)
    {
        // Get a handle to the Map Fragment
        map = ((MapFragment) getFragmentManager().findFragmentById(R.id.map))
                .getMap();
        Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
                .title("Hamburg"));
        Marker kiel = map.addMarker(new MarkerOptions()
                .position(KIEL)
                .title("Kiel")
                .snippet("Kiel is cool")
                .icon(BitmapDescriptorFactory
                        .fromResource(R.drawable.ic_launcher)));

        // Move the camera instantly to hamburg with a zoom of 15.
        map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));

        // Zoom in, animating the camera.
        map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
    }
}

And my parent fragment XML layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.collusion.serviceassistant.ReturnVisitDetails"
    android:background="#009688">


    <fragment
        android:id="@+id/map"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        class="com.google.android.gms.maps.MapFragment" />

</RelativeLayout>

Anyone have an idea why the map fragment is returning null?

EDIT: So now I have this code to initialize the map:

MapFragment mapFragment = new MapFragment();
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.add(R.id.rl_map_container, mapFragment).commit();
        map = mapFragment.getMap();
        Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
                .title("Hamburg"));
        Marker kiel = map.addMarker(new MarkerOptions()
                .position(KIEL)
                .title("Kiel")
                .snippet("Kiel is cool")
                .icon(BitmapDescriptorFactory
                        .fromResource(R.drawable.ic_launcher)));

        // Move the camera instantly to hamburg with a zoom of 15.
        map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));

        // Zoom in, animating the camera.
        map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);

And it still returns a null pointer value

Yep. Does it have anything to do with the fact that I am using a debug certificate? I only added my release certificate key to the manifest — axtscz, Sep 03 '14 at 21:39
No that should be fine, also, testing on a real device, correct? I'll post my code. — user1282637, Sep 03 '14 at 21:41

Cabezas · Answer 1 · 2015-06-27T20:46:21.493

28

I have solved the issue. this line when I have a viewpager:

mMap = ((SupportMapFragment) MainActivity.fragmentManager
                .findFragmentById(R.id.mapView)).getMap();

you have to change to this:

  mMap = ((SupportMapFragment) getChildFragmentManager()
            .findFragmentById(R.id.mapView)).getMap();

edited Jun 27 '15 at 20:46

answered Jun 27 '15 at 11:23

Cabezas

9,329
7
67
69

2

You ended 8 hours of suffering my friend :) – Marcos Casagrande Feb 07 '16 at 20:45
1

still saving lives two years later – Nilabja Oct 27 '17 at 09:32

Víctor Albertos · Answer 2 · 2014-09-03T23:28:06.763

Your class extends from Fragment, and you are using a Fragment declared in the layout, but nested fragment only work when they are added dynamically.

So, you have two options:

1) Extending from FragmentAcivity instead of Fragment and applying the proper methods.

2) Add the Fragment dynamically, as follow:

//ReturnVisitDetails

MapFragment mapFragment = new MapFragment();
FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
transaction.add(R.id.rl_map_container, mapFragment).commit();

//Layout

<FrameLayout
        android:id="@+id/rl_map_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

--UPDATED--

A complete example to use Google Maps inside a Fragment:

//TestFragmentActivity

public class TestFragmentActivity extends android.support.v4.app.FragmentActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.test_fragment_activity);
    }

}

//TestFragment

public class TestFragment extends android.support.v4.app.Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.test_fragment, container, false);

        CustomMapFragment mapFragment = new CustomMapFragment();
        FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
        transaction.add(R.id.map_container, mapFragment).commit();
        return rootView;
    }

}

//CustomMapFragment

public class CustomMapFragment extends com.google.android.gms.maps.SupportMapFragment {

    private final LatLng HAMBURG = new LatLng(53.558, 9.927);

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        GoogleMap googleMap = getMap();
        googleMap.addMarker(new MarkerOptions().position(HAMBURG).title("Hamburg"));
        googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));
        googleMap.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);
    }

}

//test_fragment_activity.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <fragment
        android:id="@+id/map"
        class="your_package.TestFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

//test_fragment.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/map_container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</RelativeLayout>

Why to getMap in onActivityCreated()? why not in onCreate() or onCreateView()? Note: getMapAsync() ... — Wooff, Jul 31 '15 at 10:51
java.lang.IllegalArgumentException: No view found for id 0x7f0b005f (com.xxx.xxx:id/fragment_container) for fragment GMapFragment{425e9c10 #0 id=0x7f0b005f} It does not work. What is the layout of CustomMapFragment? Can you share more info? — Mike, Feb 18 '17 at 09:35
I upvoted because you mentioned an excillent approach which is adding it dynamically . . — Zain Ul Abidin, May 18 '20 at 20:50

score 11 · Accepted Answer · answered Dec 23 '14 at 02:44

This issue happened to me when I tried to port my Eclipse project to Android Studio project.

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.maps.GoogleMap com.google.android.gms.maps.SupportMapFragment.getMap()' on a null object reference

I used it with a Fragment Activity like this:

((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.mapToday)).getMap();

However, the problem was, earlier I was using a specific version of Google Play Services (4.3.23).

But the Gradle build select the most recent version (compile 'com.google.android.gms:play-services:+')

I tried some other specific version like (6.1.71). But still gave null point exception.

I used the same old version as I used before and it worked.

compile 'com.google.android.gms:play-services:4.3.23'

This works for me as a temporary solution. However, this will be a problem when I need to update to a new play services library.

It seems that there is no specific map library with this version available for Gradle build when I try like this:

compile 'com.google.android.gms:play-services-maps:4.3.23'

Same problem here but I'm using eclipse... Any solution there? — user754730, Jan 04 '15 at 13:48
http://stackoverflow.com/questions/20982533/how-to-download-older-google-play-services — kalan nawarathne, Jan 07 '15 at 01:16

Mrigank · Answer 4 · 2015-09-18T18:21:26.383

I searched for a lot of threads on this as I was having the same issue with older google play services. As Victor said that your class extends from fragment and it has to use another fragment defined in the layout, So best approach will be to use getChildFragmentManager() instead of getSupportFragmentManager().

Also getMap() method is deprecated now as mentioned in google docs. Please refer this for more:- https://developers.google.com/android/reference/com/google/android/gms/maps/MapFragment.html#getMap()

Below is the working code I have tested on various devices of older play services. This will generate the default message in case of device having older google play services and in case object of GoogleMap returns null:

class MyFragment extends Fragment
{
      SupportMapFragment myMapFragment;
    GoogleMap myMap;
    View convertView;
    FragmentManager fm;
    public View onCreateView(LayoutInflater inflater, ViewGroup container,  Bundle savedInstanceState) {

    convertView=inflater.inflate(R.layout.mymap,null);
    fm=getChildFragmentManager();
        myMapFragment=(SupportMapFragment) fm.findFragmentById(R.id.myMapId);


        // here instead of using getMap(), we are using getMapAsync() which returns a callback and shows map only when it gets ready.
        //it automatically checks for null pointer or older play services version, getMap() is deprecated as mentioned in google docs.


        myMapFragment.getMapAsync(new OnMapReadyCallback() {

            @Override
            public void onMapReady(GoogleMap googlemap) {
                // TODO Auto-generated method stub
                myMap=googlemap;
                startMap();
            }
        });


    return convertView;
    }

}

See this thread for more info.

score 7 · Answer 5 · edited May 23 '17 at 12:10

7

Could this be an issue of migrating to a target sdk version of 21? If so, the following solution may be of interest to you:

MapFragment or MapView getMap() returns null on Lollipop

edited May 23 '17 at 12:10

Community

1
1

answered Dec 28 '14 at 23:31

Rhisiart

1,046
12
13

Thank you, that was my problem. – user1732313 Jun 12 '15 at 12:32

score 0 · Answer 6 · answered Sep 03 '14 at 21:53

Try using SupportMapFragment instead of MapFragment. This code works for me for a Fragment, just tried it:

import android.os.Bundle;
import android.support.v4.app.Fragment;
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.SupportMapFragment;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapFragment extends Fragment {

private GoogleMap map;
static final LatLng HAMBURG = new LatLng(53.558, 9.927);
static final LatLng KIEL = new LatLng(53.551, 9.993);

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_map, container,
            false);

    // Get a handle to the Map Fragment
    map = ((SupportMapFragment) getFragmentManager().findFragmentById(
            R.id.map)).getMap();
    Marker hamburg = map.addMarker(new MarkerOptions().position(HAMBURG)
            .title("Hamburg"));
    Marker kiel = map.addMarker(new MarkerOptions()
            .position(KIEL)
            .title("Kiel")
            .snippet("Kiel is cool")
            .icon(BitmapDescriptorFactory
                    .fromResource(R.drawable.ic_launcher)));

    // Move the camera instantly to hamburg with a zoom of 15.
    map.moveCamera(CameraUpdateFactory.newLatLngZoom(HAMBURG, 15));

    // Zoom in, animating the camera.
    map.animateCamera(CameraUpdateFactory.zoomTo(10), 2000, null);

    return rootView;
}
}

and your layout:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >

<fragment
    android:id="@+id/map"
    android:name="com.example.test.MapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    class="com.google.android.gms.maps.SupportMapFragment" />

</RelativeLayout>

score 0 · Answer 7 · answered Jul 07 '15 at 09:59

The problem may be related to the fact that your targetSdkVersion is higher than the version of Android Support Library used.

That was my case, in one of the projects we've been working on targetSdkVersion was 21, while Support Library version was 19.0.0. Changing targetSdkVersion to 19 fixed the problem.

score 0 · Answer 8 · answered Jan 26 '16 at 06:39

I can face same problem but finally i can solve that error.Now Map is Properly showing...

=> Call initilizeMap() Method in Fragment within a onCreateView() method...

=> Declare Global Variable like ,

private GoogleMap googleMap;

 private void initilizeMap() {
    try {

        // Changing marker icon
        // marker.icon(BitmapDescriptorFactory.fromResource(R.drawable.my_marker_icon)));

        // adding marker
        if (googleMap == null) {
            googleMap = ((MapFragment)getActivity().getFragmentManager()
                    .findFragmentById(R.id.map)).getMap();

            // create marker
            MarkerOptions marker = new MarkerOptions().position(
                    new LatLng(latitude, longitude)).title(
                    "YourCare");

            // Changing marker icon
            MarkerOptions icon = marker.icon(BitmapDescriptorFactory
                    .defaultMarker(BitmapDescriptorFactory.HUE_ROSE));
            // adding marker

            LatLng latLng = new LatLng(latitude, longitude);
            CameraUpdate cameraUpdate = CameraUpdateFactory.newLatLngZoom(
                    latLng, 15);
            googleMap.animateCamera(cameraUpdate);
            // locationManager.removeUpdates(this);

            googleMap.addMarker(marker);
            googleMap.setMyLocationEnabled(true);
            // check if map is created successfully or not
            if (googleMap == null) {
                Toast.makeText(getActivity(),
                        "Sorry! unable to create maps", Toast.LENGTH_SHORT)
                        .show();
            }

        }
    } catch (Exception e) {
        System.out.print("Error :" + e.getMessage());
    }

}

Google Maps Fragment returning null inside a fragment

8 Answers8

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