getSupportFragmentManager().findFragmentById returns null for google maps in fragment in android? -

i have problem google maps, i.e. getsupportfragmentmanager().findfragmentbyid returns null. have idea how solve this?

here code:

fragment_map.xml:  <framelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.myapp.something.mapfragment"> <fragment     android:id="@+id/map"     android:layout_width="match_parent"     android:layout_height="match_parent"     class="com.google.android.gms.maps.supportmapfragment" />                   </framelayout> 

mapsfragment.java:

public class mapfragment extends fragment implements onmapreadycallback, android.location.locationlistener  public void oncreate(bundle savedinstancestate)  {     super.oncreate(savedinstancestate);     supportmapfragment mapfragment = (supportmapfragment) this.getactivity().getsupportfragmentmanager().findfragmentbyid(r.id.map);     mapfragment.getmapasync(this); ... 

i have google maps in activity , works code:

supportmapfragment mapfragment = (supportmapfragment) getsupportfragmentmanager()                 .findfragmentbyid(r.id.map);         mapfragment.getmapasync(this); 

i trying reuse in fragment, becouse need maps in fragment, not in activity, doesn't work.

i tried:

• calling code in "oncreateview" function
• supportmapfragment mapfragment = (supportmapfragment) getfragmentmanager().findfragmentbyid(r.id.map);
• googlemap mgooglemap = ((supportmapfragment) getchildfragmentmanager().findfragmentbyid(r.id.map)).getmap(); deprecated, , application crashes
• supportmapfragment mapfragment = (supportmapfragment) getchildfragmentmanager().findfragmentbyid(r.id.map); , similar variations, in cases null mapfragment.

do know how solve problem?

the problem you're trying use activity's fragmentmanager, , should using fragment's child fragmentmanager.

remove oncreate() override in fragment, , add oncreateview() override inflate layout , call getmapasync():

@override public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {      view rootview = inflater.inflate(r.layout.fragment_map, container, false);      supportmapfragment mapfragment = (supportmapfragment) getchildfragmentmanager().findfragmentbyid(r.id.map);      mapfragment.getmapasync(this);      return rootview; }