android - 通过服务类将项目添加到 RecyclerView

Question

在我的 Fragment 类中，这是我将 Item 添加到我的 RecyclerView 的方式。

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            View view = inflater.inflate(R.layout.online_devices, container, false);

            recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
            linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
            recyclerView.setLayoutManager(linearLayoutManager);
            recyclerView.setHasFixedSize(true);

            theDataList = new ArrayList<>();
            theRecyclerAdpater = new TheRecyclerAdapter(getActivity().getBaseContext(), theDataList);

            recyclerView.setItemAnimator(new DefaultItemAnimator());
            recyclerView.setAdapter(theRecyclerAdpater);

            TheData a = new TheData("01","another value","another value","another value","another value");
                        theDataList.add(a);
                    a = new TheData("02","another value","another value","another value","another value");
                        theDataList.add(a);
            theRecyclerAdpater.notifyDataSetChanged();

            return view;
        }

但是如果我想在 UI 可用时通过 Service 添加一个项目到我的 RecyclerView 怎么办？我的意思是，Service 在后台运行，如果应用程序的 Main UI RecyclerView 是 Available 那么添加项目否则不要添加项目。有人知道我该怎么做吗？

目前，我的 Service 中只有这个

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate(){
        //Add an Item here to RecyclerView if the UI is Available.
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }

更新我只是试了一下，但没有用。

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.online_devices, container, false);

        recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setHasFixedSize(true);

        theDataList = new ArrayList<>();
        theRecyclerAdpater = new TheRecyclerAdapter(getActivity().getBaseContext(), theDataList);

        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(theRecyclerAdpater);

        getActivity().startService(new Intent(getActivity(),MyService.class));
        bus.register(this);

        return view;
     }

            @Subscribe
            public void getMessage(String s) {
               TheData a = new TheData(s);
               theDataList.add(a);
               theRecyclerAdpater.notifyDataSetChanged();
           }

在我的服务中

@Override
public void onCreate(){
     bus.post("PP");
}

Answer 1

首先，Otto 现在已折旧，我不得不将其更改为 EventBus .我不得不再问一遍，感谢you .所以这就是我所做的。

添加到 gradle compile 'org.greenrobot:eventbus:3.0.0'

在我的 fragment 类中

/*I had to import*/
import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;


public static class MyFragment extends Fragment {

    RecyclerView recyclerView;
    LinearLayoutManager linearLayoutManager;
    static TheRecyclerAdapter theRecyclerAdpater;
    private List<TheData> theDataList;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        EventBus.getDefault().register(this); //Register it first

        View view = inflater.inflate(R.layout.online_devices, container, false);

        recyclerView = (RecyclerView) view.findViewById(R.id.recyclerView);
        linearLayoutManager = new LinearLayoutManager(getActivity().getBaseContext());
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setHasFixedSize(true);

        theDataList = new ArrayList<>();
        theRecyclerAdpater = new TheRecyclerAdapter(getActivity().getBaseContext(), theDataList);

        recyclerView.setItemAnimator(new DefaultItemAnimator());
        recyclerView.setAdapter(theRecyclerAdpater);

        getActivity().startService(new Intent(getActivity(),MyService.class)); //I call the Service

        return view;
    }

    //Subscribe, run it on UI
    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onEvent(TheData data){
        TheData a = new TheData(data.getPc_number());
        theDataList.add(a);
        theRecyclerAdpater.notifyDataSetChanged();
    }
}

在我的服务类中

public class ServerHelperService extends Service {

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate(){
       EventBus.getDefault().post(new TheData("OK")); //and This
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return START_NOT_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
    }
}

然后就完成了。仍在阅读它的 guide .感谢您的帮助!