Parsing more than one link in android

Question

I need to parse a lot of pages (about 50) to get a full list of some data and put it into the listview. I only know how to parse a one page (by using async task) and put it into list view. I think I should dynamically add data into listview when listview reaches its footer, but how? btw, I use Universal Image Loader for displaying listview. Please help!

important part of FragmentList class (ignore onStart(), it should be elsewhere)

@Override
public void onStart() {
    // TODO Auto-generated method stub
    super.onStart();
    DownloadData downloadData = new DownloadData(getSherlockActivity());
    Log.d("tagg", "kreiran download data");
    try {
        jsonString = downloadData
                .execute(
                        "http://api.themoviedb.org/3/movie/top_rated?page=3&api_key=deleted")
                .get();
        jsonObject = new JSONObject(jsonString);
        jsonArray = jsonObject.getJSONArray("results");
            for (int j = 0; j < jsonArray.length(); j++) {
                JSONObject object = jsonArray.getJSONObject(j);
                Movie movie = new Movie();
                movie.setPoster(object.getString("poster_path"));
                movie.setTitle(object.getString("title"));
                movie.setScore(object.getDouble("vote_average"));
                movie.setId(object.getInt("id"));
                movies.add(movie);
            }

    } catch (InterruptedException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (ExecutionException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (JSONException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    setListAdapter(new TopRatedMoviesAdapter(getSherlockActivity(),
            R.id.thumbImage, R.id.tvTitle, R.id.tvScore, R.id.tvYear,
            R.layout.top_rated_movies_row, movies));
}

Important part of download data class

@Override
protected String doInBackground(String... params) {
    // TODO Auto-generated method stub
    String html = "";

    try {
        HttpClient client = new DefaultHttpClient();
        HttpGet getRequest = new HttpGet(params[0]);
        getRequest.setHeader("Accept", "*/*");
        HttpResponse response = client.execute(getRequest);

        final int statusCode = response.getStatusLine().getStatusCode();

        if (statusCode == 200) {
            html = EntityUtils.toString(response.getEntity(), HTTP.UTF_8);
        }
        Log.d("tagg", String.valueOf(statusCode));
    } catch (Exception e) {
        e.printStackTrace();
        Log.d("tagg", "exception u DownloadData");
    }

    return html;
}

important part of adapter class:

public TopRatedMoviesAdapter(Context context, int posterID, int titleID,
        int scoreID, int yearID, int layoutID, ArrayList<Movie> movies) {
    super(context, 0);
    // TODO Auto-generated constructor stub
    this.context = context;
    this.movies = movies;
    this.titleID = titleID;
    this.yearID = yearID;
    this.scoreID = scoreID;
    this.layoutID = layoutID;
    this.posterID = posterID;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    // TODO Auto-generated method stub
    LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View row = inflater.inflate(layoutID, null);

    poster = (ImageView) row.findViewById(posterID);
    title = (TextView) row.findViewById(titleID);
    year = (TextView) row.findViewById(yearID);
    score = (TextView) row.findViewById(scoreID);

    imageLoader.displayImage("http://cf2.imgobject.com/t/p/w45"
            + movies.get(position).getPoster(), poster, options, null);

    return null;
}

Universal image data is not properly set, ignore that also.

Answer 1

Call the AsyncTask again, you don't need to retain a reference because you can't reuse the instance:

new DownloadData(getSherlockActivity()).execute(YOUR_URL);

Create more of your movie objects and add them to the adapter ArrayList how you were before. Then you can call notifyDataSetChanged() on your Adapter... Just do all of that when the user scrolls to the bottom implementing an OnScrollListener.