Recycler View在通过Retrofit从Internet获取数据时无法正常工作

Question

我制作了一个视图寻呼机以及一些片段，在这些片段中，我使用回收器视图来显示从互联网上获取的动态数据。我也对我的片段使用了拉取刷新。有时由于我的片段页面加载时互联网连接缓慢，它会显示我的回收器视图数据的笨拙行为...数据在回收器视图中加载，但它可以在我的手机屏幕后面滚动，回收器视图“静止”图像显示在前面，没有滚动效果。因此，我无法正常运行我的回收器视图。当我尝试滚动时，在后面形成的页面被滚动，首页是“静止”。可能是什么问题？？？

片段文件

  package com.global.market;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.Arrays;

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class Asia extends Fragment implements SwipeRefreshLayout.OnRefreshListener{

  //  ProgressDialog pDialog;
    private RecyclerView mRecyclerView;
    //private RecyclerView.Adapter mAdapter;
    private RecyclerView.LayoutManager mLayoutManager;
    private CountryDataAdapter adapter;
    private ArrayList<CountriesData> data;
    private SwipeRefreshLayout swipe;

    public Asia(){

    }
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setHasOptionsMenu(true);

       // setContentView(R.layout.countrydata);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View v = inflater.inflate(R.layout.countrydata, container, false);
     //   pDialog = new ProgressDialog(this.getContext(), ProgressDialog.THEME_HOLO_LIGHT);
        //mRecyclerView = (RecyclerView) v.findViewById(R.id.my_recycler_view1);
        mRecyclerView = (RecyclerView)v.findViewById(R.id.my_recycler_view1);
        mRecyclerView.setHasFixedSize(true);
        mLayoutManager = new LinearLayoutManager(getContext());
        mRecyclerView.setLayoutManager(mLayoutManager);
        mRecyclerView.setAdapter(adapter);
        // loadJSON();



        swipe=(SwipeRefreshLayout)v.findViewById(R.id.swipe_refresh_layout);
        swipe.setOnRefreshListener(this);
        swipe.setColorSchemeColors(R.color.b, R.color.p, R.color.g, R.color.o);
        swipe.post(new Runnable() {
                       @Override
                       public void run() {
                           swipe.setRefreshing(true);
                           loadRetro();
                       }
                   }
        );


        return v;
    }

    private boolean isNetworkAvailable() {
        ConnectivityManager connectivityManager
                = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        return activeNetworkInfo != null && activeNetworkInfo.isConnected();
    }

    @Override
    public void onCreateOptionsMenu(
            Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.main, menu);
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_refresh) {
            boolean x=isNetworkAvailable();
            if(x)
//            pDialog.setMessage("Please wait...");
//            pDialog.setCancelable(false);
//            pDialog.show();
      //      swipe.setRefreshing(true);
            {
                loadRetro();
                return true;
            }
             else Toast.makeText(getActivity(), "No Internet Connection!",
                    Toast.LENGTH_SHORT).show();
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
    @Override
    public void onRefresh(){
    //    swipe.setRefreshing(true);
        loadRetro();
        //pDialog.dismiss();
    }

    public void loadRetro(){

        swipe.setRefreshing(true);
//        pDialog.setMessage("Please wait...");
//        pDialog.setCancelable(false);
//        pDialog.show();
        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("http://www.appuonline.com")
                .addConverterFactory(GsonConverterFactory.create())
                .build();
        jsonrequest request = retrofit.create(jsonrequest.class);
        Call<JsonResponse> call = request.getJSON();
        call.enqueue(new Callback<JsonResponse>() {
            @Override
            public void onResponse(Call<JsonResponse> call, Response<JsonResponse> response) {

                try{
                JsonResponse jsonResponse = response.body();
                data = new ArrayList<>(Arrays.asList(jsonResponse.getData()));
                adapter = new CountryDataAdapter(data);
                mRecyclerView.setAdapter(adapter);
//                    if (pDialog.isShowing())
//                        pDialog.dismiss();
                swipe.setRefreshing(false);
                }catch (Exception e){}

            }

            @Override
            public void onFailure(Call<JsonResponse> call, Throwable t) {
                try{
                    Log.d("Error1", "no connection");
                swipe.setRefreshing(false);}
                catch(Exception e){}
            }
        });
    }
}

请告诉我是否需要其他代码以进一步澄清

这是我的截图。

您在上述截图中看到的内容有时会变为“静止”，整个内容在该页面的后面变为活动内容，而首页内容不起作用。

Answer 1

您再次在“刷新”方法中设置了新适配器，这是不推荐的。尝试使用以下方法在适配器中添加新项：

在您的onCreateView中，初始化适配器，如下所示：

adapter = new MyAdapter(getActivity());

还要将此方法放入适配器中：

public void addItems(List<Object> newList){
       //put this method in your adapter
       adapterList = newList;
       notifyDatasetChanged();
       //it's better to call notifyItemRangeInserted()
}

当新数据出现时，在您的pull to refresh中添加适配器。类似这样：

adapter.addItems(your_new_fetch_list_data);

也将此设计模式用于改造可能会帮助您的代码变得更干净。