Marker is not appearing on android google maps -


i trying add marker android google maps api using android studio. when run doesn't show maker , not zoom area.

import android.support.v4.app.fragmentactivity; import android.os.bundle;  import com.google.android.gms.maps.cameraupdatefactory; import com.google.android.gms.maps.googlemap; import com.google.android.gms.maps.onmapreadycallback; import com.google.android.gms.maps.mapfragment; import com.google.android.gms.maps.model.latlng; import com.google.android.gms.maps.model.markeroptions;   public class mapwindow extends fragmentactivity implements onmapreadycallback {      private googlemap mmap;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_map_window);         mapfragment mapfragment = (mapfragment) getfragmentmanager().findfragmentbyid(r.id.map);         mapfragment.getmapasync(mapwindow.this);     }      public void onmapready(googlemap googlemap) {         mmap = googlemap;         latlng sydney = new latlng(-34, 151);         mmap.addmarker(new markeroptions().position(sydney).title("marker in sydney"));         mmap.movecamera(cameraupdatefactory.newlatlng(sydney));     } }


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