处理程序丢失WeakReference

Question

我有一个处理程序，我发送到Intent服务以便稍后接收消息并通知UI。我遇到的问题是，我很快失去了弱引用，而且我无法通知活动我收到了Intent服务请求的信息。

这是我的班级，持有信使：

public class UserManager extends Observable {

    MessengerHandler handler = new MessengerHandler(this);

    UserManager(Activity activity) {
        mActivity = activity;
    }

    @Override
    public void find() {
        Messenger messenger = new Messenger(handler);
        Intent intent = new Intent(mActivity, UserIntentService.class);
        intent.putExtra(MESSENGER_KEY, messenger);
        mActivity.startService(intent);
    }

    static class MessengerHandler extends Handler {

        private final WeakReference<UserManager> outerClass;

        public MessengerHandler(UserManager outer) {
            outerClass = new WeakReference<UserManager>(outer);
        }

        @Override
        public void handleMessage(Message msg) {

            if (outerClass.get() == null) {
                Log.e(LOG_TAG, "Weak reference lost, impossible to notify UI");
                return;
            }

            outerClass.get().setChanged();
            outerClass.get().notifyObservers();
        }
    }
}

和onHandle意图：

protected void onHandleIntent(Intent intent) {
    Message msg = Message.obtain();
    Bundle data = new Bundle();
    data.putInt(CloudManager.REQUEST_CODE_KEY, intent.getIntExtra(CloudManager.REQUEST_CODE_KEY, 0));
    msg.setData(data);

    try {
        messenger.send(msg);
    } catch (RemoteException e) {
        e.printStackTrace();
    }
}