Odtnhj

I am trying to make project using guardian API, which fetch data from JSON and it display all the news on screen in ListView, I have tried all possible methods and also Logs with information to verify the flow of code and all working properly, no errors and crashes, the only issue is that it dont display data on screen, screen is blank please help me

Here is output:
Blank Screen

Here is AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.example.hannan.newsfeed">
 <uses-permission android:name="android.permission.INTERNET"/>

 <application
 android:allowBackup="true"
 android:icon="@mipmap/ic_launcher"
 android:label="@string/app_name"
 android:roundIcon="@mipmap/ic_launcher_round"
 android:supportsRtl="true"
 android:theme="@style/AppTheme">
 <activity android:name=".MainActivity">
 <intent-filter>
 <action android:name="android.intent.action.MAIN" />

 <category android:name="android.intent.category.LAUNCHER" />

 </intent-filter>
 </activity>
 </application>

</manifest>

Here is MainActivity.java

package com.example.hannan.newsfeed;

import android.content.Intent;
import android.os.AsyncTask;
import android.support.v4.content.AsyncTaskLoader;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity 
 private static final String LOG_TAG = MainActivity.class.getSimpleName();
 private static final String GAURDIAN_URL = "https://content.guardianapis.com/search?api-key=d7262a1a-2583-4342-9b57-85ed0f621416";
 private NewsAdapter mAdapter;

 @Override
 protected void onCreate(Bundle savedInstanceState) 
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);

 ListView listView = findViewById(R.id.list);

 mAdapter = new NewsAdapter(this, new ArrayList<NewsModel>());

 listView.setAdapter(mAdapter);

 NewsAsyncTask task = new NewsAsyncTask();
 task.execute(GAURDIAN_URL);


 


 private class NewsAsyncTask extends AsyncTask<String, Void, List<NewsModel>> 

 @Override
 protected List<NewsModel> doInBackground(String... urls) urls[0] == null) 
 Log.i(LOG_TAG, "TEST: No urls available");
 return null;
 
 List<NewsModel> result = QueryUtils.fetch_data(urls[0]);
 Log.i(LOG_TAG, "TEST: In fetch_data() method of QueryUtils class");
 return result;


 

 @Override
 protected void onPostExecute(List<NewsModel> newsModels) 
 Log.i(LOG_TAG, "TEST: Completed doInBackground() Method");
 mAdapter.clear();
 Log.i(LOG_TAG, "TEST: Adapter Cleared");
 if (newsModels != null && !newsModels.isEmpty()) 
 Log.i(LOG_TAG, "TEST:Data added to Adapter");
 mAdapter.addAll();

 else 
 Log.i(LOG_TAG, "TEST: No data in Model");
 
 
 

Here is NewsAdapter.java

 package com.example.hannan.newsfeed;

import android.app.Activity;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class NewsAdapter extends ArrayAdapter 
 private static final String LOG_TAG = MainActivity.class.getSimpleName();

 public NewsAdapter(@NonNull Context context, ArrayList<NewsModel> newslist) 
 super(context, 0, newslist);
 

 @NonNull
 @Override
 public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) 
 if (convertView == null) 
 LayoutInflater.from(getContext()).inflate(R.layout.list_news, parent, false);
 

 NewsModel currentNews = (NewsModel) getItem(position);

 TextView news_title = convertView.findViewById(R.id.news_title);
 TextView news_section = convertView.findViewById(R.id.news_section);
 TextView news_date = convertView.findViewById(R.id.news_date);

 news_title.setText(currentNews.getmNewsTitle());
 news_section.setText(currentNews.getmNewsSection());
 news_date.setText(currentNews.getmNewsDate());

 return convertView;
 

Here is NewsModel.java

 package com.example.hannan.newsfeed;

public class NewsModel 

 private String mNewsTitle;
 private String mNewsSection;
 private String mNewsDate;
 private String mNewsUrl;

 NewsModel(String news_title,String news_section, String news_date, String news_url)
 mNewsTitle = news_title;
 mNewsSection = news_section;
 mNewsDate = news_date;
 mNewsUrl = news_url;
 

 public String getmNewsTitle() 
 return mNewsTitle;
 

 public String getmNewsSection() 
 return mNewsSection;
 

 public String getmNewsDate() 
 return mNewsDate;
 

 public String getmNewsUrl() 
 return mNewsUrl;
 

Here is QueryUtils.java

 package com.example.hannan.newsfeed;

import android.text.TextUtils;
import android.util.Log;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;

import javax.net.ssl.HttpsURLConnection;

public class QueryUtils 
 private static final String LOG_TAG = QueryUtils.class.getSimpleName();

 private QueryUtils() 

 

 public static ArrayList<NewsModel> fetch_data(String requestedUrl) 
 URL url = createURL(requestedUrl);
 Log.i(LOG_TAG, "TEST: URL Requested");
 String jsonResponse = null;
 try 
 jsonResponse = makeHttpRequest(url);
 Log.i(LOG_TAG, "TEST: JSON Response created");
 catch (IOException e) 
 e.printStackTrace();
 
 ArrayList<NewsModel> listnews = extractResponseFromJson(jsonResponse);

 return listnews;
 

 private static URL createURL(String stringUrl) 
 URL url = null;
 try 
 url = new URL(stringUrl);
 Log.i(LOG_TAG, "TEST: URL Created " + url);
 catch (MalformedURLException e) 
 Log.e(LOG_TAG, "TEST:Problem Building URL..", e);
 
 return url;
 

 private static String makeHttpRequest(URL url) throws IOException 
 String jsonResponse = "";
 if (url == null) 
 return jsonResponse;
 

 HttpsURLConnection urlConnection = null;
 InputStream is = null;
 try 
 urlConnection = (HttpsURLConnection) url.openConnection();
 urlConnection.setReadTimeout(10000);
 urlConnection.setConnectTimeout(15000);
 urlConnection.setRequestMethod("GET");
 urlConnection.connect();

 if (urlConnection.getResponseCode() == 200) 
 is = urlConnection.getInputStream();
 jsonResponse = readFromStream(is);
 Log.i(LOG_TAG, "TEST: Connected with HTTP");
 else 
 Log.e(LOG_TAG, "TEST:Error Response Code:" + urlConnection.getResponseCode());
 
 catch (IOException e) 
 Log.e(LOG_TAG, "TEST:Problem retrieving Data", e);
 finally 
 if (urlConnection != null) 
 urlConnection.disconnect();
 
 if (is != null) 
 is.close();
 

 
 return jsonResponse;
 

 private static String readFromStream(InputStream inputStream) throws IOException 
 StringBuilder stringBuilder = new StringBuilder();
 Log.i(LOG_TAG, "TEST: String builder created");
 if (inputStream != null) 
 InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
 BufferedReader reader = new BufferedReader(inputStreamReader);
 String line = reader.readLine();
 while (line != null) 
 stringBuilder.append(line);
 line = reader.readLine();
 
 
 Log.i(LOG_TAG, "TEST: returning String builder");
 return stringBuilder.toString();
 

 private static ArrayList<NewsModel> extractResponseFromJson(String newsJson) 
 Log.i(LOG_TAG, "TEST: In extractResponseFromJson() method..");
 if (TextUtils.isEmpty(newsJson)) 
 Log.i(LOG_TAG, "TEST: newsJson is empty");
 return null;
 
 ArrayList<NewsModel> newslist = new ArrayList<>();
 Log.i(LOG_TAG, "TEST: ArrayList created");
 try 
 JSONObject baseObject = new JSONObject(newsJson);
 Log.i(LOG_TAG, "TEST: JSON object created");
 JSONObject responseArray = baseObject.getJSONObject("response");
 Log.i(LOG_TAG, "JSON object fetched" + responseArray);
 JSONArray resultArray = responseArray.getJSONArray("results");
 for (int i = 0; i < resultArray.length(); i++) 
 Log.i(LOG_TAG, "TEST: In for loop");
 JSONObject currentNews = resultArray.getJSONObject(i);

 String title = currentNews.getString("webTitle");


 String section_name = currentNews.getString("sectionName");

 String published_date = currentNews.getString("webPublicationDate");

 String url = currentNews.getString("webUrl");

 NewsModel news = new NewsModel(title, section_name, published_date, url);

 newslist.add(news);
 Log.i(LOG_TAG, "TEST: JSON data Added to Model");

 
 catch (JSONException e) 
 e.printStackTrace();
 Log.e(LOG_TAG, "Error fetching Data from JSON");
 

 return newslist;
 

Here is main_activity.xml

 <?xml version="1.0" encoding="utf-8"?>
<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"
 tools:context=".MainActivity">

 <ListView
 android:id="@+id/list"
 android:layout_width="match_parent"
 android:layout_height="match_parent"/>

</RelativeLayout>

Here is list_news.xml

 <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 android:padding="10dp"
 xmlns:tools="http://schemas.android.com/tools">

 <TextView
 android:id="@+id/news_title"
 android:layout_width="match_parent"
 android:padding="8dp"
 android:textSize="20sp"
 android:layout_height="wrap_content"
 tools:text="News Title"/>

 <TextView
 android:id="@+id/news_section"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_below="@id/news_title"
 tools:text="News Section"
 android:textSize="14sp"
 android:layout_alignParentLeft="true"
 android:padding="8dp"/>
 <TextView
 android:id="@+id/news_date"
 android:textSize="12sp"
 android:padding="8dp"
 tools:text="News Date"
 android:layout_below="@id/news_title"
 android:layout_alignParentRight="true"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content" />

</RelativeLayout>