News Feed

activity_main.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="com.example.isa.newsfeed.MainActivity">

<android.support.v4.widget.SwipeRefreshLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/swiperefresh"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scrollbars="none">

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

AndroidManifest.xml

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

    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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>

list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <TextView
            android:id="@+id/date"
            tools:text="Sep 22, 2016"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            style="@style/date"/>

        <TextView
            android:id="@+id/section"
            tools:text="Development"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            style="@style/section"/>
    </LinearLayout>
    <TextView
        android:id="@+id/author"
        tools:text="Max Mustermann"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        style="@style/author" />

<TextView
    android:id="@+id/title"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    tools:text="This is going to be a long headline, I'm sure."
    style="@style/title"/>
</LinearLayout>

MainActivity.java

package com.example.isa.newsfeed;

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.Loader;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

import java.util.List;

public class MainActivity extends AppCompatActivity
        implements LoaderManager.LoaderCallbacks<List<News>>, SwipeRefreshLayout.OnRefreshListener {
    private NewsAdapter adapter;
    private static int LOADER_ID = 0;
    SwipeRefreshLayout swipe;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        swipe = (SwipeRefreshLayout) findViewById(R.id.swiperefresh);
        swipe.setOnRefreshListener(this);
        swipe.setColorSchemeColors(getResources().getColor(R.color.colorAccent));
        ListView listView = (ListView) findViewById(R.id.list_view);
        adapter = new NewsAdapter(this);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                News news = adapter.getItem(i);
                String url = news.url;
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setData(Uri.parse(url));
                startActivity(intent);
            }
        });
        getSupportLoaderManager().initLoader(LOADER_ID, null, this);
    }

    @Override
    public Loader<List<News>> onCreateLoader(int id, Bundle args) {
        return new NewsLoader(this);
    }

    @Override
    public void onLoadFinished(Loader<List<News>> loader, List<News> data) {
        swipe.setRefreshing(false);
        if (data != null) {
            adapter.setNotifyOnChange(false);
            adapter.clear();
            adapter.setNotifyOnChange(true);
            adapter.addAll(data);
        }
    }

    @Override
    public void onLoaderReset(Loader<List<News>> loader) {

    }

    @Override
    public void onRefresh() {
        getSupportLoaderManager().restartLoader(LOADER_ID, null, this);
    }
}

News.java

package com.example.isa.newsfeed;

public class News{
    String title;
    String author;
    String url;
    String date;
    String section;

public News(String title, String author, String url, String date, String section) {
        this.title = title;
        this.author = author;
        this.url = url;
        this.date = date;
        this.section = section;
        }

public String getTitle() {
        return title;
        }

public void setTitle(String title) {
        this.title = title;
        }

public String getAuthor() {
        return author;
        }

public void setAuthor(String author) {
        this.author = author;
        }

public String getUrl() {
        return url;
        }

public void setUrl(String url) {
        this.url = url;
        }

public String getDate() {
        return date;
        }

public void setDate(String date) {
        this.date = date;
        }

public String getSection() {
        return section;
        }

public void setSection(String section) {
        this.section = section;
        }

@Override
public String toString() {
        return "News{" +
        "title='" + title + '\'' +
        ", author='" + author + '\'' +
        ", url='" + url + '\'' +
        ", date='" + date + '\'' +
        ", section='" + section + '\'' +
        '}';
    }
}

NewsAdapter

package com.example.isa.newsfeed;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.ArrayList;

public class NewsAdapter extends ArrayAdapter<News>{

    public NewsAdapter(Context context) {
        super(context, -1, new ArrayList<News>());
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView
                    = LayoutInflater.from(getContext()).inflate(R.layout.list_item, parent, false);
        }
        TextView title = (TextView) convertView.findViewById(R.id.title);
        TextView author = (TextView) convertView.findViewById(R.id.author);
        TextView date = (TextView) convertView.findViewById(R.id.date);
        TextView section = (TextView) convertView.findViewById(R.id.section);

        News currentNews = getItem(position);
        title.setText(currentNews.getTitle());
        author.setText(currentNews.getAuthor());
        date.setText(currentNews.getDate());
        section.setText(currentNews.getSection());

        return convertView;
    }
}

NewsLoader.java

package com.example.isa.newsfeed;


import android.content.Context;
import android.support.v4.content.AsyncTaskLoader;
import android.util.Log;

import java.io.IOException;
import java.net.URL;
import java.util.List;

/**
 * Created by ISA on 04/03/2017.
 */

public class NewsLoader extends AsyncTaskLoader<List<News>> {

    public NewsLoader(Context context) {
        super(context);
    }

    @Override
    protected void onStartLoading() {
        super.onStartLoading();
        forceLoad();
    }

    @Override
    public List<News> loadInBackground() {
        List<News> listOfNews = null;
        try {
            URL url = QueryUtils.createUrl();
            String jsonResponse = QueryUtils.makeHttpRequest(url);
            listOfNews = QueryUtils.parseJson(jsonResponse);
        } catch (IOException e) {
            Log.e("Queryutils", "Error Loader LoadInBackground: ", e);
        }
        return listOfNews;
    }
}

QueryUtils.java

package com.example.isa.newsfeed;

import android.net.Uri;
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.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.Charset;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Locale;

/**
 * Created by ISA on 04/03/2017.
 */

public class QueryUtils {

    static String createStringUrl() {
    Uri.Builder builder = new Uri.Builder();
    builder.scheme("http")
            .encodedAuthority("content.guardianapis.com")
            .appendPath("search")
            .appendQueryParameter("order-by", "newest")
            .appendQueryParameter("show-references", "author")
            .appendQueryParameter("show-tags", "contributor")
            .appendQueryParameter("q", "Android")
            .appendQueryParameter("api-key", "test");
    String url = builder.build().toString();
    return url;
}

    static URL createUrl() {
        String stringUrl = createStringUrl();
        try {
            return new URL(stringUrl);
        } catch (MalformedURLException e) {
            Log.e("Queryutils", "Error creating URL: ", e);
            return null;
        }
    }

    private static String formatDate(String rawDate) {
        String jsonDatePattern = "yyyy-MM-dd'T'HH:mm:ss'Z'";
        SimpleDateFormat jsonFormatter = new SimpleDateFormat(jsonDatePattern, Locale.US);
        try {
            Date parsedJsonDate = jsonFormatter.parse(rawDate);
            String finalDatePattern = "MMM d, yyy";
            SimpleDateFormat finalDateFormatter = new SimpleDateFormat(finalDatePattern, Locale.US);
            return finalDateFormatter.format(parsedJsonDate);
        } catch (ParseException e) {
            Log.e("QueryUtils", "Error parsing JSON date: ", e);
            return "";
        }
    }

    static String makeHttpRequest(URL url) throws IOException {
        String jsonResponse = "";

        if (url == null){
            return jsonResponse;
        }
        HttpURLConnection urlConnection = null;
        InputStream inputStream = null;

        try {
            urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setReadTimeout(10000 /* milliseconds */);
            urlConnection.setConnectTimeout(15000 /* milliseconds */);
            urlConnection.connect();
            if (urlConnection.getResponseCode() == 200){
                inputStream = urlConnection.getInputStream();
                jsonResponse = readFromStream(inputStream);
            } else {
                Log.e("mainActivity", "Error response code: " + urlConnection.getResponseCode());
            }
        } catch (IOException e) {
            Log.e("Queryutils", "Error making HTTP request: ", e);
        } finally {
            if (urlConnection != null) {
                urlConnection.disconnect();
            }
            if (inputStream != null) {
                inputStream.close();
            }
        }
        return jsonResponse;
    }

    private static String readFromStream(InputStream inputStream) throws IOException {
        StringBuilder output = new StringBuilder();
        if (inputStream != null) {
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, Charset.forName("UTF-8"));
            BufferedReader reader = new BufferedReader(inputStreamReader);
            String line = reader.readLine();
            while (line != null) {
                output.append(line);
                line = reader.readLine();
            }
        }
        return output.toString();
    }

    static List<News> parseJson(String response) {
        ArrayList<News> listOfNews = new ArrayList<>();
        try {
            JSONObject jsonResponse = new JSONObject(response);
            JSONObject jsonResults = jsonResponse.getJSONObject("response");
            JSONArray resultsArray = jsonResults.getJSONArray("results");

            for (int i = 0; i < resultsArray.length(); i++) {
                JSONObject oneResult = resultsArray.getJSONObject(i);
                String webTitle = oneResult.getString("webTitle");
                String url = oneResult.getString("webUrl");
                String date = oneResult.getString("webPublicationDate");
                date = formatDate(date);
                String section = oneResult.getString("sectionName");
                JSONArray tagsArray = oneResult.getJSONArray("tags");
                String author = "";

                if (tagsArray.length() == 0) {
                    author = null;
                } else {
                    for (int j = 0; j < tagsArray.length(); j++) {
                        JSONObject firstObject = tagsArray.getJSONObject(j);
                        author += firstObject.getString("webTitle") + ". ";
                    }
                }
                listOfNews.add(new News(webTitle, author, url, date, section));
            }
        } catch (JSONException e) {
            Log.e("Queryutils", "Error parsing JSON response", e);
        }
        return listOfNews;
    }
}

styles.xml

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

    <style name="title" parent="Base.TextAppearance.AppCompat.Large">
        <item name="android:layout_marginBottom">8dp</item>
        <item name="android:layout_marginTop">6dp</item>
        <item name="android:layout_marginLeft">16dp</item>
        <item name="android:layout_marginRight">16dp</item>

    </style>

    <style name="author" parent="Base.TextAppearance.AppCompat.Small">
        <item name="android:layout_marginBottom">8dp</item>
        <item name="android:layout_marginLeft">16dp</item>
        <item name="android:layout_marginRight">16dp</item>
    </style>

    <style name="date" parent="Base.TextAppearance.AppCompat.Small">
        <item name="android:layout_marginBottom">8dp</item>
        <item name="android:layout_marginLeft">16dp</item>
        <item name="android:layout_marginTop">16dp</item>
    </style>

    <style name="section" parent="Base.TextAppearance.AppCompat.Small">
        <item name="android:gravity">right</item>
        <item name="android:layout_marginTop">16dp</item>
        <item name="android:layout_marginBottom">8dp</item>
        <item name="android:layout_marginRight">16dp</item>
    </style>

</resources>