Google Maps getMap returns null

Question

UPDATED I read many topics but nothing helped or I didn't understand what to do. I get null and I don't know why. I am just learning so please help me.

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
        at com.example.text.fragments.MapFragment.initilizeMap(MapFragment.java:52)
        at com.example.text.fragments.MapFragment.onViewCreated(MapFragment.java:46)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:971)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1136)
        at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:739)
        at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1499)
        at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:488)
        at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:163)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:1073)
        at android.support.v4.view.ViewPager.populate(ViewPager.java:919)
        at android.support.v4.view.ViewPager$3.run(ViewPager.java:249)
        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:792)
        at android.view.Choreographer.doCallbacks(Choreographer.java:596)
        at android.view.Choreographer.doFrame(Choreographer.java:556)
        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:778)
        at android.os.Handler.handleCallback(Handler.java:739)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:155)
        at android.app.ActivityThread.main(ActivityThread.java:5696)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)

This is Fragment where I implemented getMap

public class MapFragment extends Fragment implements OnMapReadyCallback{

    private GoogleMap googleMap;
    /**
     * function to load map. If map is not created it will create it for you
     * */


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.map_fragment, container, false);
        return view;
    }
    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onViewCreated(view, savedInstanceState);
        // here, as doc say, the map can be initialized, or the service is not available
        initilizeMap();
    }

     private void initilizeMap() {
        if (googleMap == null) {
            ((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(
                    R.id.map)).getMapAsync(this);

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

    @Override
    public void onMapReady(GoogleMap mGoogleMap) {
        googleMap = mGoogleMap;
    }
}

This is map_fragment.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"
        android:name="com.google.android.gms.maps.SupportMapFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>


</RelativeLayout>

This is my manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.test" >

    <permission
        android:name="com.example.test.permission.MAPS_RECEIVE"
        android:protectionLevel="signature" />

    <uses-permission android:name="com.example.test.permission.MAPS_RECEIVE" />

    <uses-sdk
        android:minSdkVersion="17"
        android:targetSdkVersion="22" />

    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <!-- Required to show current location -->
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

    <!-- Required OpenGL ES 2.0. for Maps V2 -->
    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme"
        android:supportsRtl="true">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="AIzaSyBUeq6ANw9MyK9vwB4phnSOkp6e_UccN4E" />

    </application>

</manifest>

I use sliding tabs and in one tab has to have map. I create this map in this part of code in ViewPagerAdapter:

 @Override
    public Fragment getItem(int position) {

        if(mNumbOfTabs == 3) {
            if (position == 0) {
                A a = new A();
                return a;
            } else if (position == 1) {
                B b = new B();
                return b;
            } else {
                MapFragment mapFragment = new MapFragment();
                return mapFragment;
            }
    }

You should be using `getMapAsync` rather than `getMap` since Play Services 6.5. — stkent, May 06 '15 at 12:49
Did you try this Not the exact solution but I guess it is useful http://stackoverflow.com/questions/21029015/app-crash-when-trying-to-access-mapfragment — Raghavendra, May 06 '15 at 12:54

score 5 · Accepted Answer · edited May 23 '17 at 12:16

5

Since the 6.5 version of Play Services Google recommends using of asynchronous getting of GoogleMap and getMap() is now deprecated. As stkent's mentioned you have to call getMapAsync(this).

As this method asynchronous you need some callback for this method, that's why also you have to make your fragment implementing OnMapReadyCallback and in the method onMapReady() of these callbacks you can get reference to the map.

Also change line ((SupportMapFragment)getActivity().getSupportFragmentManager().findFragmentById(R.id.map)).getMapAsync(this); to ((SupportMapFragment)getChildFragmentManager().findFragmentById(R.id.map)).getMapAsync(this); 'cause inside fragment you have to use ChildFragmentManager.

edited May 23 '17 at 12:16

Community

1
1

answered May 06 '15 at 13:08

Oleg Osipenko

2,409
1
20
28

I did this: @Override public void onMapReady(GoogleMap mGoogleMap) { googleMap = mGoogleMap; } }); But still the same problem – Nominalista May 06 '15 at 13:32
try to change line `((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById( R.id.map)).getMapAsync(this);` to line `((SupportMapFragment) getActivity().getChildFragmentManager().findFragmentById( R.id.map)).getMapAsync(this);` – Oleg Osipenko May 06 '15 at 13:53
Oh, remove `getActivity()` call, sorry. `((SupportMapFragment) getChildFragmentManager().findFragmentById( R.id.map)).getMapAsync(this);` – Oleg Osipenko May 06 '15 at 14:00
It works, can you help me how to add for example button on the map? – Nominalista May 06 '15 at 14:13
did you try to look at https://developers.google.com/maps/documentation/android/marker guide? – Oleg Osipenko May 06 '15 at 14:24
I read but not everything, but I want text view or button or whatever is it possible ? – Nominalista May 06 '15 at 14:34
you can add marker to your map and this guide shows how to do it. In case of problems post new question, but not in this thread 'cause it's another question not related with original – Oleg Osipenko May 06 '15 at 14:36

score 2 · Answer 2 · answered May 06 '15 at 13:01

2

I had the same problem, with google maps v2 you should use getExtendedMap()instead. Try this.

answered May 06 '15 at 13:01

Mateus Brandao

900
5
9

I don't have this method – Nominalista May 06 '15 at 13:05
1

@Mateus Brandao: `getExtendedMap()` is a method for *Android Maps Extensions*: https://code.google.com/p/android-maps-extensions/ not *Google Maps Android API v2* – Rami May 06 '15 at 13:15

Google Maps getMap returns null

2 Answers2

Linked