Google Map Marqueur d'événement OnClick

Je suis à l'aide fourni par google Map API V2 et android afin de faire une application android. Voici le code où j'ai mis mon marqueur:

private void addBusStopMarker(){
    final Intent intent1;
    map.addMarker(new MarkerOptions().position(new LatLng(1.28213,103.81721)).title("10009 - Bt Merah Ctrl").icon(BitmapDescriptorFactory.fromResource(R.drawable.busstopicon)).snippet("Average Commuters: 9,940"));
    map.addMarker(new MarkerOptions().position(new LatLng(1.28294,103.82166)).title("10089 - Jln Bt Merah - B08").icon(BitmapDescriptorFactory.fromResource(R.drawable.busstopicon)).snippet("Average Commuters: 2,050"));
    map.setOnMarkerClickListener(new OnMarkerClickListener()
    {

        @Override
        public boolean onMarkerClick(Marker arg0) {
             if(arg0.getTitle().equals("10009 - Bt Merah Ctrl"))
                 intent1 = new Intent(context, PopulationCharts.class);
                 startActivity(intent1);       
            return true;
        }
    });    
}

Fondamentalement, ce que je suis en train de faire, c'est quand le marqueur est sélectionné, il affiche la fenêtre d'information qui est dans le code ci-dessus. Ensuite, lorsque je sélectionne l'extrait de code, il va exécuter la onMarkerClick événement.

Cependant, à partir du code ci-dessus, il me montre un message d'erreur: The final local variable intent1 cannot be assigned, since it is defined in an enclosing type. Aussi, je ne savez pas comment définir marqueur snipper événement onClick
.
Merci à l'avance.

Édité partie

map.setOnInfoWindowClickListener(new OnInfoWindowClickListener() {
        @Override
        public void onInfoWindowClick(Marker marker) {
           Intent intent = new Intent(context ,PopulationCharts.class);
           startActivity(intent);


        }
    });

Message D'Erreur

07-29 12:24:12.774: E/AndroidRuntime(15704): FATAL EXCEPTION: main
07-29 12:24:12.774: E/AndroidRuntime(15704): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.googlemap/com.example.googlemap.PopulationCharts}: java.lang.NullPointerException
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1894)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.access$600(ActivityThread.java:127)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.os.Looper.loop(Looper.java:137)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.main(ActivityThread.java:4512)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.reflect.Method.invokeNative(Native Method)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.reflect.Method.invoke(Method.java:511)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:982)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at dalvik.system.NativeStart.main(Native Method)
07-29 12:24:12.774: E/AndroidRuntime(15704): Caused by: java.lang.NullPointerException
07-29 12:24:12.774: E/AndroidRuntime(15704):    at com.example.googlemap.PopulationCharts.<init>(PopulationCharts.java:28)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.Class.newInstanceImpl(Native Method)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at java.lang.Class.newInstance(Class.java:1319)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.Instrumentation.newActivity(Instrumentation.java:1026)
07-29 12:24:12.774: E/AndroidRuntime(15704):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1885)
07-29 12:24:12.774: E/AndroidRuntime(15704):    ... 11 more
07-29 12:24:20.563: I/Process(15704): Sending signal. PID: 15704 SIG: 9

De la Population de la classe

package com.example.googlemap;
public class PopulationCharts extends Activity{
Intent intent = getIntent();
String markerTitle= intent.getExtras().getString("markertitle");
//Pie chart 
private GraphicalView chartPop;
private String[] ageGroupPop;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.population_charts);
openChartAgeGroupPop();
openChartPeakPop();
}
private void openChartAgeGroupPop(){     
//codes to generate pie chart
}
//Line chart
private View lineChart;
private String[] time = new String[] {
"0700", "0800" , "0900", "1000", "1100", "1200", "1300", "1400", "1500", "1600", "1700", "1800"};
public void openChartPeakPop(){
//code to generate multiple line chart
}
}