title: How get a reference to a GoogleMap object created in java?
body: <p>I'm trying to get a reference to a GoogleMap object created java, and i don't know how to get this reference.</p>
  
  <p>Here's my code:</p>
  
  <pre><code>        LinearLayout mapLayout = new LinearLayout(customToursActivity);
          mapLayout.setId(generateViewId(rootView));
          int mapLayoutHeight = Math.round(getResources().getDimension(R.dimen.custom_tour_list_map_size));
          mapLayout.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, mapLayoutHeight));
          layout.addView(mapLayout);
  
          FragmentManager fm = getChildFragmentManager();
          SupportMapFragment supportMapFragment =  SupportMapFragment.newInstance();
          fm.beginTransaction().replace(mapLayout.getId(), supportMapFragment).commit();
          GoogleMap mMap = supportMapFragment.getMap();
          mMap.setMyLocationEnabled(true);
  </code></pre>
  
  <p>Here's the log i got:</p>
  
  <pre>
  01-23 17:09:54.168    3795-3795/abff.googlemapsappteste E/AndroidRuntime﹕ FATAL EXCEPTION: main
      Process: abff.googlemapsappteste, PID: 3795
      java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.gms.maps.GoogleMap.setMyLocationEnabled(boolean)' on a null object reference
              at abff.googlemapsappteste.CustomToursList.createPlacemarksList(CustomToursList.java:458)
              at abff.googlemapsappteste.CustomToursList.onCreateView(CustomToursList.java:73)
              at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789)
              at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:955)
              at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
              at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:740)
              at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1501)
              at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:490)
              at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
              at android.support.v4.view.ViewPager.populate(ViewPager.java:1105)
              at android.support.v4.view.ViewPager.populate(ViewPager.java:951)
              at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1473)
              at android.view.View.measure(View.java:17637)
              at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
              at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
              at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:124)
              at android.view.View.measure(View.java:17637)
              at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
              at android.support.v7.internal.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:444)
              at android.view.View.measure(View.java:17637)
              at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
              at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
              at android.view.View.measure(View.java:17637)
              at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
              at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
              at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
              at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
              at android.view.View.measure(View.java:17637)
              at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5536)
              at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
              at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2618)
              at android.view.View.measure(View.java:17637)
              at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2019)
              at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1177)
              at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1383)
              at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1065)
              at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5901)
              at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
              at android.view.Choreographer.doCallbacks(Choreographer.java:580)
              at android.view.Choreographer.doFrame(Choreographer.java:550)
              at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
              at android.os.Handler.handleCallback(Handler.java:739)
              at android.os.Handler.dispatchMessage(Handler.java:95)
              at android.os.Looper.loop(Looper.java:211)
              at android.app.ActivityThread.main(ActivityThread.java:5389)
              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:1020)
              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)
  </pre>