Geocoder Context in Subclass

My Main Activity is AddressFinder, here I start a AddressController:

AddressController ac = new AddressController();

The AddressController should update in some cases:

import android.content.Context;
....
private void updateAddresses() throws IOException {
    Geocoder geocoder = new Geocoder(context);
 for (Address a: address) {
 List<Address> addressIn = geocoder.getFromLocation(a.getLatitude(), 
                                                       a.getLongitude(), 1);
 }
}

Now I have no idea which context I have to use. I don't understand how to use it. I tried this, context, getBaseContext(), getApp开发者_Go百科licationContext() but nothing worked. Furthermore i tried to give the Adresscontroller an argument with the context (getApplicationContext) of the main activity.

I think i got a solution. In the main activity i use following:

ac.updateAddr(getApplicationContext());

In the AddressController i changed:

public void updateAddr(Context c) throws IOException {
    updateAddresses(c);
}

Thats the way I give the context to the Geocoder in the AddressController. Works fine.

In your Activity class create variable:

Context con = this;  
... 
Geocoder geocoder = new Geocoder(con);

Maybe use another constructor?:

public Geocoder (Context context, Locale locale)