Update Position Listview JSON

Question

Guten Morgen, habe ich Probleme beim Aktualisieren der Position eines ListView, das Daten über Json empfängt. Ich bin in der Lage, die Information zu filtern, aber zum Zeitpunkt der Übergabe von Informationen von einem Listenelement an eine andere Aktivität übergibt er einfach das Element der Position, die vor dem Filtern war.

Das ist meine Klasse, die die Listenansicht erhält:

public class HomeFragment extends Fragment { 

// Log tag 
private static final String TAG = MainActivity.class.getSimpleName(); 

// Movies json url 
private static final String url = "http://api.androidhive.info/json/movies.json"; 
private List<Movie> movieList = new ArrayList<Movie>(); 
private ListView listView; 
private CustomListAdapter adapter; 
Movie movie; 

public HomeFragment() { 
    // Required empty public constructor 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
         Bundle savedInstanceState) { 
    View rootView = inflater.inflate(R.layout.fragment_home, container, false); 


    // Inflate the layout for this fragment 

    return rootView; 
} 

public void onActivityCreated(Bundle savedInstanceState) { 
    super.onActivityCreated(savedInstanceState); 

    listView = (ListView) getActivity().findViewById(R.id.list); 
    adapter = new CustomListAdapter(getActivity(), movieList); 
    listView.setAdapter(adapter); 

    // Creating volley request obj 
    JsonArrayRequest movieReq = new JsonArrayRequest(url, 
      new Response.Listener<JSONArray>() { 
       @Override 
       public void onResponse(JSONArray response) { 
        Log.d(TAG, response.toString()); 

        // Parsing json 
        for (int i = 0; i < response.length(); i++) { 
         try { 
          JSONObject obj = response.getJSONObject(i); 
          movie = new Movie(); 
          movie.setTitle(obj.getString("title")); 
          movie.setThumbnailUrl(obj.getString("image")); 
          movie.setRating(obj.getString("rating")); 
          movie.setGenre(obj.getString("genre")); 
          movie.setYear(obj.getString("releaseYear"));         

          // adding movie to movies array 
          movieList.add(movie); 
         } catch (JSONException e) { 
          e.printStackTrace(); 
         } 

        } 
        // notifying list adapter about data changes 
        // so that it renders the list view with updated data 

        //calls getFilter 
        adapter.getFilter().filter("The"); 
        adapter.notifyDataSetChanged(); 
       } 
      }, new Response.ErrorListener() { 
     @Override 
     public void onErrorResponse(VolleyError error) { 
      VolleyLog.d(TAG, "Error: " + error.getMessage()); 

     } 
    }); 

    // Adding request to request queue 
    AppController.getInstance().addToRequestQueue(movieReq); 

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

     @Override 
     public void onItemClick(AdapterView<?> parent, View view, 
           int position, long id) { 
      // getting values from selected ListItem 
      movie = movieList.get(position); 
      String thumbNail = movie.getThumbnailUrl(); 
      String titulo = movie.getTitle(); 
      String pontuacao = movie.getRating(); 
      String genero = movie.getGenre(); 
      String ano = movie.getYear(); 

      // Starting single contact activity 
      Intent in = new Intent(getActivity(), 
        SearchResultsActivity.class); 

      in.putExtra("img", image); 
      in.putExtra("title", title); 
      in.putExtra("pontuacao", rating); 
      in.putExtra("genero", genre); 
      in.putExtra("ano", year); 

      startActivity(in); 

     } 
    }); 

} 


@Override 
public void onAttach(Activity activity) { 
    super.onAttach(activity); 
} 

@Override 
public void onDetach() { 
    super.onDetach(); 
} 

Das ist meine Adapter-Klasse:

public class CustomListAdapter extends BaseAdapter { 
private Activity activity; 
private LayoutInflater inflater; 
private List<Movie> movieItems; 
private List<Movie> mMovieItems; 
ImageLoader imageLoader = AppController.getInstance().getImageLoader(); 

public CustomListAdapter(Activity activity, List<Movie> movieItems) { 
    this.activity = activity; 
    this.movieItems = movieItems; 
    this.mMovieItems = movieItems; 
} 

@Override 
public int getCount() { 
    return movieItems.size(); 
} 

@Override 
public Object getItem(int location) { 
    return movieItems.get(location); 
} 

@Override 
public long getItemId(int position) { 
    return position; 
} 

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 

    if (inflater == null) 
     inflater = (LayoutInflater) activity 
       .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
    if (convertView == null) 
     convertView = inflater.inflate(R.layout.list_row, null); 

    if (imageLoader == null) 
     imageLoader = AppController.getInstance().getImageLoader(); 
    NetworkImageView thumbNail = (NetworkImageView) convertView 
      .findViewById(R.id.thumbnail); 
    TextView title = (TextView) convertView.findViewById(R.id.title); 
    TextView rating = (TextView) convertView.findViewById(R.id.rating); 
    TextView genre = (TextView) convertView.findViewById(R.id.genre); 
    TextView year = (TextView) convertView.findViewById(R.id.releaseYear); 

    // getting movie data for the row 
    Movie m = movieItems.get(position); 

    // thumbnail image 
    thumbNail.setImageUrl(m.getThumbnailUrl(), imageLoader); 

    // title 
    title.setText(m.getTitle()); 

    // rating 
    rating.setText("Rating: " + String.valueOf(m.getRating())); 

    // genre 
    genre.setText("Genero: " + String.valueOf(m.getGenre())); 

    // release year 
    year.setText(String.valueOf(m.getYear())); 

    return convertView; 
} 

public Filter getFilter() { 
    Filter filter = new Filter() { 

     @Override 
     protected FilterResults performFiltering(CharSequence filter) { 
      FilterResults results = new FilterResults(); 
      //if it was not carried out no filter inserts all items. 
      if (filter== null || filter.length() == 0) { 
       results.count = mMovieItems.size(); 
       results.values = mMovieItems; 
      } else { 
       //creates an array to store the filtered objects. 
       List<Movie> itens_filtrados = new ArrayList<Movie>(); 

       //runs list checking that contains the filter word in the description of the obje 
       for (int i = 0; i < mMovieItems.size(); i++) { 
        Movie data = mMovieItems.get(i); 

        filter= filter.toString().toLowerCase(); 
        String condicao = data.getTitle().toLowerCase(); 

        if (condicao.contains(filter)) { 
         //restrain adds to the list of filtered items . 
         itens_filtrados.add(data); 
        } 
       } 
       //Sets the filter result in variable FilterResults 
       results.count = itens_filtrados.size(); 
       results.values = itens_filtrados; 
      } 
      return results; 
     } 

     @SuppressWarnings("unchecked") 
     @Override 
     protected void publishResults(CharSequence constraint, Filter.FilterResults results) { 
      movieItems = (List<Movie>) results.values; //filtered values. 
      notifyDataSetChanged(); //Notifies the change list 
     } 
    }; 
    return filter; 
} 

Ich hoffe jemand kann mir helfen, danke im Voraus.

Answer 1

In Ihrem onItemClick Sie das Element aus Ihrer vollständigen Liste eher als das gefilterte eine bekommen.

Statt:

movie = movieList.get(position); 

Sie sollten das Element aus dem Adapter erhalten Sie wie folgt vor.

movie = (Movie) adapter.getItem(position); 

Dies sollte das Element in der Liste der gefilterten Elemente zurück, weil Ihre publishResults die gefilterte Positionsliste movieItems setzt.

Answer 2

Das Problem ist, dass Sie nicht die gefilterte MovieList von Ihrem Adapter verwenden. Sie verwenden die Liste in Ihrer Aktivität (die nicht gefiltert wird).

Um dies zu lösen, fügen Sie einfach einen Getter für Ihre gefilterte Liste zu Ihrem Adapter hinzu.

public List<Movie> retrieveDisplayedMovies(){ 
    return movieItems; 
} 

Dann in Ihrer Aktivität ändern Sie die folgende Zeile

// getting values from selected ListItem 
movie = movieList.get(position); 

diesen

// getting values from selected ListItem 
movie = adapter.retrieveDisplayedMovies().get(position);