Unable to start activity...Attempt to invoke virtual method...MapFragment.getMapAsync

Question

My Application keeps crashing once it opens in nexus 6. The Problem is with getMapAsync().

public class MainActivity extends AppCompatActivity implements OnMapReadyCallback {

    GoogleMap mMap; //member variable
    private static final int ERROR_DIALOG_REQUEST = 9001; //constant to request certain king of dialog box definition from google play services lib
    private static final double
            AJAX_LAT = 43.851063,
            AJAX_LNG = -79.019737;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (servicesOK()) {
            setContentView(R.layout.activity_main);

            if (initMap()) {
                Toast.makeText(this, "Ready to map!", Toast.LENGTH_SHORT).show();
                gotoLocation(AJAX_LAT, AJAX_LNG, 13);

                //as of now user must grand permissions to app from phone settings
                try {
                    mMap.setMyLocationEnabled(true);
                } catch (SecurityException e) {
                    Toast.makeText(this, "My Location not enabled!", Toast.LENGTH_SHORT).show();
                }
            } else {
                Toast.makeText(this, "Map not connected!", Toast.LENGTH_SHORT).show();
            }
        } else {
            Toast.makeText(this, "Services not OK!", Toast.LENGTH_SHORT).show();
        }
    }

    //get a reference to the map object
    public boolean initMap() {
        if (mMap == null) {
            MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map); mapFragment.getMapAsync(this);
        }
        return (mMap != null);
    }
    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

    }

    //check to see if the google services are ok
    public boolean servicesOK() {

        GoogleApiAvailability googleAPI = GoogleApiAvailability.getInstance();
        int isAvailable = googleAPI.isGooglePlayServicesAvailable(this);
        // handle 3 different possibility
        if (isAvailable == ConnectionResult.SUCCESS) { //everything ok, user can make mapping request
            return true;
        } else if (googleAPI.isUserResolvableError(isAvailable)) { //error user can do something about
            Dialog dialog = googleAPI.getErrorDialog(this, isAvailable, ERROR_DIALOG_REQUEST);
            dialog.show(); //google play services lib delivers correct dialog box telling user what to do
        } else { //something wrong, user cant do anything about
            Toast.makeText(this, "Can't connect to mapping service", Toast.LENGTH_SHORT).show();
        }
        return false;
    }
}

Below is the error i get

Process: com.example.suhail.onmyway, PID: 27425
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.suhail.onmyway/com.example.suhail.onmyway.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.MapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.MapFragment.getMapAsync(com.google.android.gms.maps.OnMapReadyCallback)' on a null object reference
    at com.example.suhail.onmyway.MainActivity.initMap(MainActivity.java:89)
    at com.example.suhail.onmyway.MainActivity.onCreate(MainActivity.java:47)
    at android.app.Activity.performCreate(Activity.java:6251)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476) 
    at android.app.ActivityThread.-wrap11(ActivityThread.java) 
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344) 
    at android.os.Handler.dispatchMessage(Handler.java:102) 
    at android.os.Looper.loop(Looper.java:148) 
    at android.app.ActivityThread.main(ActivityThread.java:5417) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

i have a button in activity_main.xml that once clicked opens another layout where a fragment is included

Usually with `AppCompatActivity`, you use `SupportMapFragment` and `getSupportFragmentManager()`. Beyond that, you might wish to post your `activity_main` layout. — CommonsWare, Jun 05 '16 at 22:34
i used SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map); mMap = mapFragment.getMap(); before,but getMap() is now deprecated — Suhail Yaftaly, Jun 05 '16 at 22:46
Possible duplicate of [What is a NullPointerException, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Vucko, Jun 05 '16 at 23:02

score 0 · Answer 1 · edited May 23 '17 at 11:58

Put setContentView out of if block It crashes from line 89 What is code of this line ?

------------ Update ------------

Use It :

            GoogleMap map = ((WorkaroundMapFragment) getSupportFragmentManager().findFragmentById(R.id.map)).getMap();
            final LatLng GOOGLE_MAP_POSITION = new LatLng(lat, lng);
            Log.d("GOOGLE_MAP", "lat : " + lat + " , lng : " + lng);
            if (map != null) {
                map.clear();
                map.setMapType(GoogleMap.MAP_TYPE_NORMAL);
                Marker marker = map.addMarker(new MarkerOptions().position(GOOGLE_MAP_POSITION)
                        .title("Title")
                        .snippet("Content Goes Here")
                        .icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED)));
            }
            MapsInitializer.initialize(this);
            // Move the camera instantly to target with a zoom of 14.
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(GOOGLE_MAP_POSITION, 50));
            // Zoom in, animating the camera, Change 14 to Zoom in And Zoom Out
            map.animateCamera(CameraUpdateFactory.zoomTo(14), 2000, null);

            int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getApplicationContext());
            if (resultCode == ConnectionResult.SUCCESS){
                Log.e("DETAIL_ACTIVITY", "Google Play Services Util Available SUCCESS : "+resultCode);
            }else{
                Log.e("DETAIL_ACTIVITY", "Google Play Services Util Available Problem : "+resultCode);
                GooglePlayServicesUtil.getErrorDialog(resultCode, this, 1);
            }

Also WorkaroundMapFragment is a Custom Class that Let you to use map inside ScrollView

To use it check it out.

line 89 MapFragment mapFragment = (MapFragment) getFragmentManager().findFragmentById(R.id.map); mapFragment.getMapAsync(this); — Suhail Yaftaly, Jun 05 '16 at 22:44

score 0 · Answer 2 · answered Jun 05 '16 at 22:48

Probably your mapFragment is null, also incorrect getMapAsync usage, you must use all that belongs to map only after you receive the map, so you must act only after this call back is called:

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

}

add all next initialisations in runnable and call it after

mMap = googleMap;

Juan Cruz Soler · Answer 3 · 2016-06-05T22:54:07.490

0

You have to add this to your activity_main.xml

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

edited Jun 05 '16 at 22:54

answered Jun 05 '16 at 22:49

Juan Cruz Soler

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i have a button in activity_main.xml that once clicked opens another layout where a fragment is included – Suhail Yaftaly Jun 05 '16 at 22:53

Unable to start activity...Attempt to invoke virtual method...MapFragment.getMapAsync

3 Answers3