Unable to start activity ComponentInfo with Mainactivity and Navigation drawer?

Question

I'm having issues with my MainActivity starting and fragment navigation drawer working with google maps. The error i'm getting is actually two errors in one and looks like this:

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.examples.blahblah.blahblah/com.examples.blahblah.blahblah.MainActivity2Activity}: 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

Now I believe this is something to do with my fragment file which looks like this:

    package com.examples.blahblah.blahblah;

import android.app.Fragment;
import android.os.Bundle;
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.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;


    public class menu_1_fragment extends Fragment implements OnMapReadyCallback {

        View rootview;

        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            rootview = inflater.inflate(R.layout.menu1_layout, container, false);

            MapFragment mapFragment = (MapFragment) getFragmentManager()
                    .findFragmentById(R.id.map);
            mapFragment.getMapAsync(this);

            return rootview;
        }

        @Override
        public void onMapReady(GoogleMap map) {
            LatLng sydney = new LatLng(-33.867, 151.206);

            map.setMyLocationEnabled(true);
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 13));

            map.addMarker(new MarkerOptions()
                    .title("Sydney")
                    .snippet("The most populous city in Australia.")
                    .position(sydney));
        }
    }

But I will post my MainActivity if anybody thinks it could be that could be the reason I'm getting this error instead. But I wasn't getting this error until I started changing my Fragment file.

Edit: Updated Code Having issues with getSupportFragment

    import android.app.Fragment;
import android.os.Bundle;
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.MapFragment;
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 menu_1_fragment extends Fragment implements OnMapReadyCallback {

        View rootview;

        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            rootview = inflater.inflate(R.layout.menu1_layout, container, false);


            return rootview;
        }

        public void onActivityCreated(Bundle savedInstanceState) {
            super.onActivityCreated(savedInstanceState);
            SupportMapFragment mapFragment = ((SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.map));
            mapFragment.getMapAsync(this);
        }

        @Override
        public void onMapReady(GoogleMap map) {
            LatLng sydney = new LatLng(-33.867, 151.206);

            map.setMyLocationEnabled(true);
            map.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 13));

            map.addMarker(new MarkerOptions()
                    .title("Sydney")
                    .snippet("The most populous city in Australia.")
                    .position(sydney));
        }
    }

Answer 1

Try changing your

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

to this

SupportMapFragment mapFragment = ((SupportMapFragment) getChildFragmentManager()
    .findFragmentById(R.id.map));

Don't forget to do the necessary imports.

Edit: Try moving this code inside of onActivityCreated() and remove it from onCreateView()

public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
    SupportMapFragment mapFragment = ((SupportMapFragment) getChildFragmentManager()
    .findFragmentById(R.id.map));
    mapFragment.getMapAsync(this);