用call BroadCastReceiver更新BroadCastReceiver

Question

我的片段中有一个回收器视图，我希望每次在广播接收器中推送消息时更新我的回收器视图，.My问题是当接收者调用时，它用以前的项目替换新的项目，但是我想创建新的行，以前的项目仍然存在。我找了很多东西，但没有成功。这是我的片段，里面有广播接收器。

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View drawer = inflater.inflate(R.layout.fragment_notif_list, container, false);
    rv = (RecyclerView) drawer.findViewById(R.id.recyclerview);
    rv.setHasFixedSize(true);
    mLayoutManager = new LinearLayoutManager(getActivity());
    rv.setLayoutManager(mLayoutManager);
    prefs = getActivity().getSharedPreferences(Config.SHARED_PREF_NAME, Context.MODE_PRIVATE);


    mRegistrationBroadcastReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {

            if (intent.getAction().equals(Config.PUSH_NOTIFICATION)) {
                // new push notification is received
                Toast.makeText(getActivity(), "Push notification is received!", Toast.LENGTH_LONG).show();

                message = intent.getStringExtra("message");
                title = intent.getStringExtra("title");
                timestamp = intent.getStringExtra("timestamp");
                Log.d("message -->", message);
                Log.d("title -->", title);
                Log.d("time -->", timestamp);
                MessageObj messageObj = new MessageObj(message,title,timestamp);

                getDataSet(messageObj.getMessage(),messageObj.getTitle(),messageObj.getDate());

            }
        }
    };

    return drawer;
}


private void getDataSet(String message,String title,String date) {
    ArrayList results = new ArrayList<MessageObj>();

        MessageObj obj = new MessageObj(message,title,date);
        Log.d("result size :",results.size()+"");
        results.add(results.size(),obj);
    mAdapter = new MessageAdapter(getActivity(), results);
    rv.setAdapter(mAdapter);
    mAdapter.notifyDataSetChanged();


}

Answer 1

这是因为每次接收广播时都要创建一个新的results ArrayList和新的适配器。您需要在广播接收器范围之外创建数组列表和适配器。然后，只需在得到广播时添加到数组列表中即可。然后调用适配器上的notifyDataSetChanged，让它更新UI。