Android：在FragmentStatePagerAdapter中使用相同Fragment的两个实例的问题

Question

我有一个有两个页面的ViewPager，每个页面都包含一个相同Fragment的实例。在每个片段中，我有一个相同的RecyclerView实例。问题是，在第一个RecyclerView.Adapter的项目点击事件中，它从第二个RecyclerView获取数据。 RecyclerView.Adapter的ViewHolder是：

public class ViewHolder extends RecyclerView.ViewHolder {
    TextView name;
    TextView timestamp;

    public ViewHolder(final View itemView) {
        super(itemView);
        name = (TextView) itemView.findViewById(R.id.name);
        timestamp = (TextView) itemView.findViewById(R.id.timestamp);

        // Setup the click listener
        itemView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // Triggers click upwards to the adapter on click
                if (listener != null)
                    listener.onItemClick(itemView, getLayoutPosition());
            }
        });
    }

在片段中：

listAdapter.setOnItemClickListener(new FeedListAdapter.OnItemClickListener() {
    @Override
    public void onItemClick(View itemView, int position) {
        //feedItems.get(position) always returns the item of the second RecyclerView
       //feedItems is datasource of the adapter
    }
});

片段代码：

public class FeedListFragment extends Fragment {
    private static final String TAG = FeedListFragment.class.getSimpleName();
    private RecyclerView listView;
    private FeedListAdapter listAdapter;
    private List<Feed> feedItems = new ArrayList<Feed>();

    public FeedListFragment(){
        super();
    }

    private String getFeedUrl() {
        Bundle bundle = getArguments();
        if (bundle == null) {
            return null;
        }
        return bundle.getString("feedUrl");
    }


    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v =  inflater.inflate(R.layout.feed_list,container,false);
        listView = (RecyclerView) v.findViewById(R.id.list);

        listAdapter = new FeedListAdapter(getActivity(), feedItems);
        listAdapter.setOnItemClickListener(new FeedListAdapter.OnItemClickListener() {
            @Override
            public void onItemClick(View itemView, int position) {
                Intent intent = new Intent(getActivity(), FeedDetailActivity.class);
                Bundle bundle = new Bundle();
                bundle.putLong("feedId", feedItems.get(position).getId());
                intent.putExtras(bundle);
                intent.putExtra("feed", feedItems.get(position));
                startActivity(intent);
            }
        });
        listView.setAdapter(listAdapter);
        listView.setLayoutManager(new LinearLayoutManager(getActivity()));

        (new Handler()).postDelayed(
                new Runnable() {
                    @Override
                    public void run() {
                        refreshContent();
                    }
                },
                1000
        );

        return v;
    }

    public void refreshContent(){
        JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET, getFeedUrl(), null, new Response.Listener<JSONObject>()
        {
            @Override
            public void onResponse(final JSONObject response) {
                if (response != null) {
                    //Need to process response with an AsyncTask or progressbar will be frozen.
                    // See http://stackoverflow.com/questions/27978274/volley-progressdialog-stuck-freeze-at-the-time-of-get-huge-amount-of-data
                    new AsyncTask<JSONObject, Void, List<Feed>>() {
                        @Override
                        protected List<Feed> doInBackground(JSONObject... params) {
                            ServerResponseStatus responseStatus = JSONUtil.parseServerResponseStatus(params[0]);
                            if (AppController.STATUS_OK.equals(responseStatus.getStatus())) {
                                return parseJsonFeed(params[0]);
                            } else {
                                switchState(State.ERROR, responseStatus.getErrorMessage());
                            }
                            return null;
                        }

                        @Override
                        protected void onPostExecute(List<Feed> feeds) {
                            if (feeds == null) {
                                return;
                            }
                            feedItems.clear();
                            feedItems.addAll(feeds);
                            listAdapter.notifyDataSetChanged();
                            switchState(State.READY, null);
                        }

                    }.execute(response);

                }
            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                //show error message
            }
        });

        // Adding request to volley request queue
        jsonReq.setShouldCache(false);

        AppController.getInstance().addToRequestQueue(jsonReq);
    }

    /**
     * Parsing json reponse and passing the data to feed view list adapter
     * */
    private List<Feed> parseJsonFeed(JSONObject response) {
        List<Feed> feeds = null;
        try {
            JSONArray feedArray = response.getJSONArray("feeds");
            feeds = JSONUtil.parseFeedList(feedArray, new JSONUtil.JSONParseOptions());
        } catch (JSONException e) {
            switchState(State.ERROR, e.toString());
            return null;
        }
        return feeds;
    }
}

ViewPagerAdapter代码：

public class ViewPagerAdapter extends FragmentStatePagerAdapter {

    CharSequence titles[]; // This will Store the titles of the Tabs which are Going to be passed when ViewPagerAdapter is created
    int numbOfTabs; // Store the number of tabs, this will also be passed when the ViewPagerAdapter is created
    private FeedListFragment homeTab;
    private FeedListFragment favTab;


    // Build a Constructor and assign the passed Values to appropriate values in the class
    public ViewPagerAdapter(FragmentManager fm, CharSequence mTitles[], int mNumbOfTabsumb) {
        super(fm);

        this.titles = mTitles;
        this.numbOfTabs = mNumbOfTabsumb;

    }

    //This method return the fragment for the every position in the View Pager
    @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                return getHomeTab();
            case 1:
                return getFavTab();
            default:
                return null;
        }
    }

    // This method return the titles for the Tabs in the Tab Strip

    @Override
    public CharSequence getPageTitle(int position) {
        return titles[position];
    }

    // This method return the Number of tabs for the tabs Strip

    @Override
    public int getCount() {
        return numbOfTabs;
    }

    public FeedListFragment getHomeTab() {
        if (homeTab == null) {
            Bundle bundle = new Bundle();
            bundle.putString("feedUrl", "...");
            homeTab = new FeedListFragment();
            homeTab.setArguments(bundle);
        }
        return homeTab;
    }

    public FeedListFragment getFavTab() {
        if (favTab == null) {
            Bundle bundle = new Bundle();
            bundle.putString("feedUrl", "...");
            favTab = new FeedListFragment();
            favTab.setArguments(bundle);
        }
        return favTab;
    }

}

很奇怪，因为适配器中的所有变量都是非静态的。有没有人遇到这个问题，可以提供帮助？ 感谢!!!