Question

早上好，我在更新通过json接收数据的listview的位置时遇到了问题。我能够过滤信息，但在将信息从一个列表项传递到另一个活动时，他只是传递过滤前的位置项。

这是我收到listview的课程：

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();
}

这是我的适配器类：

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;
}

我希望有人可以帮助我，提前谢谢你。

Answer 1

问题是您不使用适配器中的过滤后的movieList。您可以在活动中使用该列表（未过滤）。

要解决此问题，只需将已过滤列表的getter添加到适配器。

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

然后在您的活动中更改以下行

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

到这个

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

Answer 2

在onItemClick中，您将从完整列表中获取该项目，而不是已过滤的项目。

而不是：

movie = movieList.get(position);

您应该从适配器获取该项目，如下所示。

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

这应该返回已过滤商品列表中的商品，因为您的publishResults会将过滤商品列表设置为movieItems。

更新位置listview json

2 个答案: