通过调用 BroadCastReceiver 更新 RecyclerView

Question

我的片段中有一个回收站视图，每次在广播接收器中出现推送消息时，我都想更新我的回收站视图。我的问题是当接收器调用时，它用以前的项目替换新项目，但我想创建新行和以前的项目仍然存在。我搜索了很多但没有成功。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，您都在创建一个新的 results ArrayList 和新的 Adapter。一旦超出广播接收器的范围，您就需要创建数组列表和适配器。然后在收到广播时简单地添加到数组列表中。然后在你的适配器上调用 notifyDataSetChanged 让它更新 UI.

通过调用 BroadCastReceiver 更新 RecyclerView

Update RecyclerView with call BroadCastReceiver

android

android-recyclerview

android-broadcastreceiver