LocationManagerService.java

public class LocationManagerService extends ILocationManager.Stub {

    private Receiver getReceiverLocked(ILocationListener listener, int pid, int uid,
                                       String packageName) {
        IBinder binder = listener.asBinder();
        Receiver receiver = mReceivers.get(binder);
        if (receiver == null) {
            receiver = new Receiver(listener, null, pid, uid, packageName);
            mReceivers.put(binder, receiver);
            try {
                // Register to receive a notification when the process hosting
                // the token goes away.
                receiver.getListener().asBinder().linkToDeath(receiver, 0);
            } catch (RemoteException e) {
                Slog.e(TAG, "linkToDeath failed:", e);
                return null;
            }
        }
        return receiver;
    }

    private final class Receiver implements IBinder.DeathRecipient, PendingIntent.OnFinished {
        @Override
        public void binderDied() {
            synchronized (mLock) {
                removeUpdatesLocked(this);
            }
        }

        private void removeUpdatesLocked(Receiver receiver) {

            if (mReceivers.remove(receiver.mKey) != null && receiver.isListener()) {
                // We no longer care about receiving death notifications.
                receiver.getListener().asBinder().unlinkToDeath(receiver, 0);
                synchronized (receiver) {
                    receiver.clearPendingBroadcastsLocked();
                }
            }

        }
    }
}