Refresh our list when we move

Given the location sensitive nature of WamF it makes sense to update the display whenever we move. Do this by asking theLocationManager to trigger a new Intent when our location provider notices we've moved.

List providers = locationManager.getProviders(); LocationProvider provider = providers.get(0); Intent intent = new Intent(LOCATION_CHANGED); locationManager.requestUpdates(provider, minTime, minDistance, intent);

Intents in Android are like events in traditional event driven programming, so we're triggering a LOCATION_CHANGED event/intent every time we move by a minimum distance after a minimum time. The next step is to create an IntentReceiver (event handler), so create a new internal class that extends IntentReceiver and override the ReceiveIntent event to call our update method.

public class myIntentReceiver extends IntentReceiver {
@Override public void onReceiveIntent(Context context, Intent intent) {
updateList();
}
}

We then have our activity listen for a LOCATION_CHANGED intent by registering the event handler and specifying the intent it should be listening for (LOCATION_CHANGED). Do this in the onCreate method or create a new menu option to start/stop the automatic updates.

filter = new IntentFilter(LOCATION_CHANGED); receiver = new myIntentReceiver(); registerReceiver(receiver, filter);

Keep your phone running light by registering / unregistering the receiver when the activity Pauses and Resumes – there's no point in listening for location changes if we can't see the list.