google maps - Cannot get polygon to show on MapFragment in Android app -

i trying draw polygon on mapfragment cannot render. using code example developer docs no avail. new must missing obvious cannot work out is. not getting runtime errors.

here relevant bit of main activity.

public class userlocation<mainactivity> extends activity  {  blah blah...  //set initial map fragment view     map = ((mapfragment)getfragmentmanager().findfragmentbyid(r.id.map)).getmap();      latlng startpoint = new latlng(-30.89,24.26);        //see use of cameraposition.builder here gives cool perspective view on map. see use of map.animatecamera using method too;     cameraposition cameraposition = new cameraposition.builder().target(startpoint).tilt(60).zoom(6).bearing(0).             build();     map.animatecamera(cameraupdatefactory.newcameraposition(cameraposition));       //try add polgyon      list<latlng> points = arrays.aslist(new latlng(18.39416, -33.97885),             new latlng(18.45116, -33.97885),              new latlng(18.45116, -33.91077),              new latlng(18.39416, -33.91077),              new latlng(18.39416, -33.97885));      polygonoptions options = new polygonoptions();     options.addall(points);     options.fillcolor(color.red);     map.addpolygon(options); 

the xml file

  <textview       android:id="@+id/header"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:text="@string/hello_world" />     <fragment       android:id="@+id/map"       class="com.google.android.gms.maps.mapfragment"       android:layout_width="match_parent"       android:layout_height="match_parent"        />               <imagebutton     android:id="@+id/mainnavigationbutton"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:layout_gravity="bottom"     android:layout_marginleft="120dp"     android:onclick="onclick_launch_mainnavigation"     android:alpha="0.8"     android:src="@drawable/copbutton"/>     <spinner       android:id="@+id/spinner1"       android:layout_width="wrap_content"       android:layout_height="wrap_content"       android:layout_margintop="17dp"       android:entries="@array/crime_arrays"       android:prompt="@string/crime_prompt" />                 </framelayout> 

the documents suggest simple process i'm stumped. in advance advice.

your code should work. be, accidently switching longitude/latitude, since drawing polygons (24.26,-30.89) move camera (-30.89,24.26).

to ensure @ right area, create button calls

 private function onbuttonclick(){     latlng startpoint = new latlng(24.26,-30.89);    cameraposition cameraposition = new cameraposition.builder().target(startpoint).tilt(60).zoom(6).bearing(0).         build();    map.animatecamera(cameraupdatefactory.newcameraposition(cameraposition));  }