java - Google Map variable is null -


i'm trying , set googlemap variable using the following code: 

 private googlemap mmap;    mmap = ((mapfragment) getfragmentmanager().findfragmentbyid(r.id.mymapview)).getmap();      //mapfragment fm = (mapfragment)     getfragmentmanager().findfragmentbyid(r.id.mymapview);     //mmap = fm.getmap();      log.e("ridetracking", "google map value:"+mmap);      if (mmap != null) {          proxy.setprojection(mmap.getprojection());     }

here xml part of app: 

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

for reason value of mmap null , i'm not sure why returning null since have line of code: 

mmap = ((mapfragment) getfragmentmanager().findfragmentbyid(r.id.mymapview)).getmap();

here logcat output: 

05-13 14:09:08.553: e/ridetracking(6415): google map value:null

can offer advice on why of mmap null? appreciated.

if try putting code in method onactivitycreated(). make sure map ready.


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