Unable to get a facebook page's feed onto my app

Question

I want my app to just display the posts published by a facebook page without any authentication. Here is the code:

public class Main extends Activity {

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

    try {
    String APP_ID = "1234567890";         
    String APP_SECRET = "1a2b3c4defghijk";
    String OWNER_OF_FEED = "somepage";

    HttpClient client = new DefaultHttpClient();
    HttpGet get = new HttpGet(
            "https://graph.facebook.com/oauth/access_token?client_id="+ 
            APP_ID + 
            "&client_secret="+APP_SECRET+"&grant_type=client_credentials");

    ResponseHandler<String> responseHandler = new BasicResponseHandler();

    String access_token = client.execute(get, responseHandler);

    String uri = "https://graph.facebook.com/" + OWNER_OF_FEED + "/feed?"
            + access_token;

    get = new HttpGet(uri);
    String responseBody = client.execute(get, responseHandler);

    // responseBody contains JSON-encoded feed

    //textview.setText(responseBody);
    TextView txtv = (TextView) findViewById(R.id.feed);
    txtv.setText(String.valueOf(responseBody)); 
    }

    catch (Exception ex) {
        ex.printStackTrace();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}
}

But am unable to get any content on the app. I have included the permission for internet access in the manifest file.

New code:

public class MainActivity extends Activity {

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

        URL url;
        try {
            url = new URL("https://www.facebook.com/feeds/page.php?format=rss20&id=289781571139242");

            HttpURLConnection urlConnection = (HttpURLConnection) url
                    .openConnection();

            InputStream in = urlConnection.getInputStream();

            InputStreamReader isw = new InputStreamReader(in);

            int data = isw.read();
            while (data != -1) {
                char current = (char) data;
                data = isw.read();
                System.out.print(current);
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}

Answer 1

There is actually a way to get a page public feed without user permission!

Solution

1. Get the page Facebook Profile Id: the simplest way is to query the Graph API http://graph.facebook.com/{YourPageUsername} . e.g. for oStream Android App https://graph.facebook.com/oStreamApp will return Facebook Profile Id 289781571139242

2. Request the RSS of the Facebook page feed: Make an http request to https://www.facebook.com/feeds/page.php?format=rss20&id={yourAppId} e.g. For oStream Android App the Public https://www.facebook.com/feeds/page.php?format=rss20&id=289781571139242

An Android implementation will simply be:

1. Make an http request to http://graph.facebook.com/{YourPageUsername}
2. Parse the content and get the YourPageId
3. Make an http request to https://www.facebook.com/feeds/page.php?format=rss20&id={yourAppId}
4. Parse the content
5. Display the content as you wish

Side note This question is not very much about Android but just with Facebook API.