title: google maps are returning null pointer exception
body: <p>when I am trying to  show the maps on my fragment it is returning null pointer exception.
  I have added everything to the manifest each and every permission.
  I am attaching the fragment file its XML file and the log cat </p>
  
  <p>Chatffragment.java</p>
  
  <pre><code>  public class ChatFragment extends Fragment{
          // Google Map
          private GoogleMap googleMap;
  
          public ChatFragment() {
              // Required empty public constructor
          }
  
          @Override
          public void onCreate(Bundle savedInstanceState) {
  
              super.onCreate(savedInstanceState);
          }
  
          @Override
          public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                   Bundle savedInstanceState)
          {
  
              View chatfrag = inflater.inflate(R.layout.chatfragment, container, false);
  
  
              try {
                  // Loading map
                  initilizeMap();
  
              } catch (Exception e) {
                  e.printStackTrace();
              }
              return chatfrag;
          }
              /**
               * function to load map. If map is not created it will create it for you
               * */
  
          private void initilizeMap()
          {
              if (googleMap == null) {
                  SupportMapFragment mapFrag = (SupportMapFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.map);
  
                  googleMap = mapFrag.getMap();
                  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();
                  }
              }
          }
  
          @Override
          public void onResume() {
              super.onResume();
              initilizeMap();
  
  
          }
  
  
  
  
      }
  </code></pre>
  
  <p>Its XML</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
  &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent" &gt;
  
      &lt;fragment
          android:id="@+id/map"
          android:name="com.google.android.gms.maps.SupportMapFragment"
          android:layout_width="match_parent"
          android:layout_height="match_parent"/&gt;
  
  &lt;/RelativeLayout&gt;
  </code></pre>
  
  <p>LOGCAT</p>
  
  <pre><code>04-05 09:12:22.075 26987-26987/com.example.vikrant.safeshelter E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                   Process: com.example.vikrant.safeshelter, PID: 26987
  
  
  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
                                                                                   at com.example.vikrant.safeshelter.ChatFragment.initilizeMap(ChatFragment.java:55)
                                                                                   at com.example.vikrant.safeshelter.ChatFragment.onResume(ChatFragment.java:70)
                                                                                   at android.support.v4.app.Fragment.performResume(Fragment.java:2020)
                                                                                   at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1107)
                                                                                   at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1252)
                                                                                   at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:738)
                                                                                   at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1617)
                                                                                   at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:570)
                                                                                   at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:164)
                                                                                   at android.support.v4.view.ViewPager.populate(ViewPager.java:1177)
                                                                                   at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:608)
                                                                                   at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:570)
                                                                                   at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:551)
                                                                                   at android.support.design.widget.TabLayout$ViewPagerOnTabSelectedListener.onTabSelected(TabLayout.java:1627)
                                                                                   at android.support.design.widget.TabLayout.selectTab(TabLayout.java:837)
                                                                                   at android.support.design.widget.TabLayout.selectTab(TabLayout.java:809)
                                                                                   at android.support.design.widget.TabLayout$Tab.select(TabLayout.java:1077)
                                                                                   at android.support.design.widget.TabLayout$1.onClick(TabLayout.java:643)
                                                                                   at android.view.View.performClick(View.java:4759)
                                                                                   at android.view.View$PerformClick.run(View.java:19770)
                                                                                   at android.os.Handler.handleCallback(Handler.java:739)
                                                                                   at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                   at android.os.Looper.loop(Looper.java:135)
                                                                                   at android.app.ActivityThread.main(ActivityThread.java:5234)
                                                                                   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:909)
                                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:704)
  </code></pre>
  
  <p>line 55 and 70 are 
  googleMap = mapFrag.getMap();
  initilizeMap();</p>