android - 如何从服务器获取滑动刷新布局中的数据

Question

我正在回收站视图中从服务器获取数据。我正在尝试实现刷卡刷新以获取服务器上的更新数据。但是当我刷新它从服务器获取最新数据但不替换回收器视图中的旧数据时，我在回收器视图中有重复数据，包括旧数据和最新数据。每次我在回收器视图中刷新数据副本。

这是我的代码如下：

片段主页.xml

<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".Home"
android:orientation="vertical"
android:id="@+id/linearHome"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="8dp"
android:paddingBottom="16dp">  

 <android.support.v4.widget.SwipeRefreshLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/refresh">

    <android.support.v7.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/recycle"
        android:layout_marginTop="10dp"
        />

    </android.support.v4.widget.SwipeRefreshLayout>

</RelativeLayout>

主页.java

public class Home extends Fragment {

RecyclerView recycle;
ArrayList<LoadHomeBooks> list;
SwipeRefreshLayout refresh;

private static final String URL = "https://www.example.com"

public Home() {
    // Required empty public constructor
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View view = inflater.inflate(R.layout.fragment_home, container, false);

    recycle = view.findViewById(R.id.recycle);
    refresh = view.findViewById(R.id.refresh);

    list = new ArrayList<>();

    recycle.setHasFixedSize(true);
    recycle.setLayoutManager(new LinearLayoutManager(getActivity()));

    loadData();

    refresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {

           loadData();
        }
    }); 

    return view;

  } 

} 

 private void loadData(){

     OkHttpClient client = new OkHttpClient.Builder()
                .connectTimeout(22, TimeUnit.SECONDS)
                .readTimeout(22, TimeUnit.SECONDS)
                .writeTimeout(22, TimeUnit.SECONDS)
                .build();

        RequestBody formBody = new FormBody.Builder().add("city", myValue).build();

        Request request = new Request.Builder().url(URL).post(formBody).build();

        client.newCall(request).enqueue(new Callback() {

            @Override
            public void onResponse(Call call, final Response response) throws IOException {

                if (getActivity() != null) {

                    getActivity().runOnUiThread(new Runnable() {

                        @Override
                        public void run() {

                            try {

                                prog.setVisibility(View.GONE);

                                JSONArray jsonArray = new JSONArray(response.body().string());

                                if (jsonArray.length() == 0) {

                                    nobook.setVisibility(View.VISIBLE);
                                }

                                for (int i = jsonArray.length() - 1; i > -1; i--) {

                                    JSONObject jsonObject = jsonArray.getJSONObject(i);

                                    String str1 = jsonObject.getString("Book_name");

                                    LoadHomeBooks model = new LoadHomeBooks(str1);

                                    list.add(model);
                                }

                               HomeBookAdapter adapter = new HomeBookAdapter(listist, getContext());

                                recycle.setAdapter(adapter);

                            } catch (JSONException e) {
                                e.printStackTrace();

                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    });
                }
            }

            @Override
            public void onFailure(Call call, final IOException e) {

                if (getActivity() != null) {

                    getActivity().runOnUiThread(new Runnable() {

                        @Override
                        public void run() {

                            TastyToast.makeText(getActivity(), e.getMessage(), TastyToast.LENGTH_LONG, TastyToast.ERROR).show();
                        }
                    });
                }
            }

        });
 }

有人请让我知道我做错了什么。任何帮助将不胜感激。

谢谢

标签： android

Answer 1

将您的 setOnRefreshListener 更改为：

refresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
               list.clear();
               loadData();
            }
        });