在这个片段中，我向服务器发送一个带有齐射的jsonRequest。我正在将swipeRefreshLayout设置为此片段，我只想加载新的json数据，但是当我在sendJsonRequest()上使用onRefresh()方法时，所有json数据都被启用到{ {1}}：
这是我的片段代码：
recyclerView现在我的问题在于package ghandak.ghandshekan.com.ghandak.fragments;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
import ghandak.ghandshekan.com.ghandak.R;
import ghandak.ghandshekan.com.ghandak.adapters.PostRecyclerAdapter;
import ghandak.ghandshekan.com.ghandak.app.AppController;
import ghandak.ghandshekan.com.ghandak.models.PostData;
/**
* Created by imajid on 12/19/2015.
*/
public class TabFragment3 extends Fragment implements OnRefreshListener{
private RecyclerView allContentRecyclerView;
private String url = "http://kakdo.herokuapp.com/api/news/?format=json";
private List<PostData> postDataList = new ArrayList<PostData>();
private SwipeRefreshLayout swipeRefreshLayout;
//====================================================================================== onCreateView
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab_fragment_3 , container , false);
allContentRecyclerView = (RecyclerView)view.findViewById(R.id.xmlRecyclerViewtabFragment3);
allContentRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
swipeRefreshLayout = (SwipeRefreshLayout)view.findViewById(R.id.xml_swipe_refresh_layout_tab_fragment_3);
swipeRefreshLayout.setOnRefreshListener(this);
swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_blue_bright,
android.R.color.holo_green_light,
android.R.color.holo_orange_light,
android.R.color.holo_red_light);
//swipeRefreshLayout.setColorSchemeColors();
return view;
}
//====================================================================================== onCreate
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
sendJsonRequest();
}
//====================================================================================== sendjsonRequest
private void sendJsonRequest() {
JsonArrayRequest request = new JsonArrayRequest(Request.Method.GET, url, (String) null, new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
parseJsonResponse(response);
//==========setting adapter to the recyclerview <==
allContentRecyclerView.setAdapter(new PostRecyclerAdapter(getActivity() ,postDataList));
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
AppController.getInstance().addToRequestQueue(request);
}
//====================================================================================== parsjsonResponse()
private void parseJsonResponse(JSONArray response) {
if(response == null){
Toast.makeText(getActivity(), "ریسپانس خالی هستش", Toast.LENGTH_SHORT).show();
return;
}else {
Log.d("parsejsonresponse", "response khali nist");
for (int i = 0 ; i < response.length() ; i++ ){
try {
//Toast.makeText(getActivity(), "ریسپانس میگیرم ", Toast.LENGTH_SHORT).show();
JSONObject currentPost = response.getJSONObject(i);
//Log.d("currentPost", "currentPost ro gereftam");
PostData postData = new PostData();
postData.setTitle(currentPost.getString("title"));
//Toast.makeText(getActivity() , currentPost.getString("title") , Toast.LENGTH_SHORT).show();
postData.setCreate(currentPost.getString("create"));
postDataList.add(postData);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}
@Override
public void onRefresh() {
sendJsonRequest();
swipeRefreshLayout.setRefreshing(false);
}
}
方法，我可以编写什么来加载新的json数据，而不是所有存在的json。
答案 0 :(得分：4)
在代码中添加此行
postDataList.clear(); in your code given in bellow.
<强>更新
@Override
public void onResponse(JSONArray response) {
if(response == null )
return;
postDataList.clear();
parseJsonResponse(response);
//==========setting adapter to the recyclerview <==
allContentRecyclerView.setAdapter(new PostRecyclerAdapter(getActivity() ,postDataList));
}
注意：在代码中创建任何类型的列表max create adapter instance时，在更改列表数据之后，您只需要调用＆＃39; adapterInstance.notifyDataSetChange（）;＆＃ 39; 这是最佳做法，而不是每次刷新列表项时更好地创建列表，进一步信息检查here
答案 1 :(得分：1)
添加此代码，
private SwipeRefreshLayout mSwipeRefreshLayout;
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mSwipeRefreshLayout.setRefreshing(true);
}
}, SPLASH_DISPLAY_LENGTH);
}
});
当你想要刷新它时，
mSwipeRefreshLayout.setRefreshing(true);
答案 2 :(得分：1)
swipeContainer = (SwipeRefreshLayout) rootView.findViewById(R.id.swipeContainer);
swipeContainer.setOnRefreshListener(new OnRefreshListener()
{
@Override
public void onRefresh()
{
//clear your old data
callForData();
//swipeContainer.setRefreshing(false); use this while get data and set in you ui
}
});
// Configure the refreshing colors
swipeContainer.setColorSchemeResources(android.R.color.holo_blue_bright, android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light);