NYT App

bbuildingwavy.jpg

Categories.java

package package <<YOUR PACKAGE HERE>>;

import java.util.HashMap;

public class Categories extends HashMap<String, String> {

    public Categories() {
        put("Home","home");
        put("Opinion", "opinion");
        put("World", "world");
        put("National", "national");
        put("Politics", "politics");
        put("Upshot", "upshot");
        put("NY Region", "nyregion");
        put("Business", "business");
        put("Technology", "technology");
        put("Science", "science");
        put("Health", "health");
        put("Sports", "sports");
        put("Arts", "arts");
        put("Books", "books");
        put("Movies", "movies");
        put("Theater", "theater");
        put("Sunday Review", "sundayreview");
        put("Fashion", "fashion");
        put("Style Magazine", "tmagazine");
        put("Food", "food");
        put("Travel", "travel");
        put("Magazine", "magazine");
        put("Real Estate", "realestate");
        put("Automobiles", "automobiles");
        put("Obituaries", "obituaries");
        put("Insider", "insider");

    }
}

Class Diagram.png

NYTTask.java

// Note this class was used early on in the walkthroughs. It was subsequently modified and implemented as an anonymous inner class.

package package <<YOUR PACKAGE HERE>>;

import android.os.AsyncTask;
import android.util.Log;

import java.io.BufferedInputStream;
// we will convert this later to be nested anonymous class

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;

public class NYTTask extends AsyncTask<String, Void, String> {

    private static final String TAG = "NYTApp";

    /**
     * Override this method to perform a computation on a background thread. The
     * specified parameters are the parameters passed to {@link #execute}
     * by the caller of this task.
     * <p>
     * This method can call {@link #publishProgress} to publish updates
     * on the UI thread.
     *
     * @param objects The parameters of the task.
     * @return A result, defined by the subclass of this task.
     * @see #onPreExecute()
     * @see #onPostExecute
     * @see #publishProgress
     */
    @Override
    protected String doInBackground(String... categories) {

        Scanner scanner = null;
        HttpURLConnection conn = null;
        StringBuilder jsonSB;

        String category = categories[0];

        try {
            URL url = new URL("https://api.nytimes.com/svc/topstories/v2/" + category + ".json?api-key=2c7894bbed624037a0757b46326ccae5");
            jsonSB = new StringBuilder();
            conn = (HttpURLConnection) url.openConnection();
            InputStream in = new BufferedInputStream(conn.getInputStream());
            scanner = new Scanner(in);

            // process entire stream
            while (scanner.hasNext())
                jsonSB.append(scanner.nextLine());

            String msg = "(" + conn.getResponseCode() +  "):" + conn.getResponseMessage();
            Log.v(TAG, "Response" + msg);

            // TODO handle non-200 errors here

        } catch (IOException e) {
            Log.e(TAG, e.getMessage());
            return "ERROR";
        } finally {
            if (scanner != null) scanner.close();
            if (conn != null) conn.disconnect();
        }
        return jsonSB.toString();
    }

    /**
     * <p>Runs on the UI thread after {@link #doInBackground}. The
     * specified result is the value returned by {@link #doInBackground}.</p>
     * <p>
     * <p>This method won't be invoked if the task was cancelled.</p>
     *
     * @param s The result of the operation computed by {@link #doInBackground}.
     * @see #onPreExecute
     * @see #doInBackground
     * @see #onCancelled(Object)
     */
    @Override
    protected void onPostExecute(String result) {
        super.onPostExecute(result);
        Log.v(TAG, "json response =" + result);
    }
}

service info

service link: https://developer.nytimes.com/

service documentation: https://developer.nytimes.com/top_stories_v2.json#/Documentation/GET/%7Bsection%7D.%7Bformat%7D
(all category names can be found here)

add the permission that we need in AndroidManifest.xml
    <uses-permission android:name="android.permission.INTERNET" />
put this at the same level as application element in the manifest file

Stories.java

package <<YOUR PACKAGE HERE>>;

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

import java.util.ArrayList;

public class Stories extends ArrayList<Stories.Story> {

    private String json;
    private ArrayList<String> titles;

    /**
     * Removes all of the elements from this list.  The list will
     * be empty after this call returns.
     */
    @Override
    public void clear() {
        super.clear();
        titles.clear();
    }

    private Stories() {
        super();
        titles = new ArrayList<String>();
    }

    public Stories(String json)  {
        this();
        this.json=json;

        try {
            JSONObject jsonObject = new JSONObject(json);
            JSONArray results = jsonObject.getJSONArray("results");
            for (int i = 0; i < results.length(); i++) {
                JSONObject jo = (JSONObject) results.get(i);
                String title = jo.getString("title");
                String url = jo.getString("url");
                this.add(new Story(title, url));
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        
        for (Story s : this)            // set up an array, so that listview can take advantage of this 
            titles.add(s.getTitle());   // need to be sure this and titles stay in sync
    }

    public String getJson() {
        return json;
    }

    public void replace(Stories stories) {
        clear();
        titles.clear();
        addAll(stories);
        for (Story s : this)            
            titles.add(s.getTitle());
    }

    public ArrayList<String> getTitles() {
        return titles;
    }


    protected class Story {

        String title;
        String url;

        public Story(String title, String url) {
            this.title = title;
            this.url = url;
        }

        public String getTitle() {
            return title;
        }

        public String getUrl() {
            return url;
        }
    }
}