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  2. Can not reload ListView Content after implementing Filterable interface on my CustomListAdapter

Can not reload ListView Content after implementing Filterable interface on my CustomListAdapter

由 只谈情不闲聊 提交于 2019-12-02 10:05:14

Here are answers to your questions:
1. The ListView is not reloaded? After looking at your code at function:

@Override
protected void publishResults(CharSequence constraint, FilterResults results) {
         //filteredData = (ArrayList<String>) results.values;
         movieItems = (ArrayList<Movie>) results.values;
         notifyDataSetChanged();
}

The aboved function make your adapter cant reload of course. Why? Because this line: movieItems = (ArrayList<Movie>) results.values;. You reference your movieItems in adapter to another List so movieList.add(movie); d in your MainActivity doesnot chang anything in your adapter any more. How to overcome it? Change as below:

movieItems.clear();
movieItems.addAll((ArrayList<Movie>) results.values);
notifyDataSetChanged();

However, Your Search function still doesnt work. Why? Because in performFiltering you tried to search in movieItems not your backup data. --> you should search in your back up data: originalMovieList, then publish by adding in movieItems.

//change final List<Movie> list = movieItems;
//to belowed line in peformFiltering
final List<String> list = originalData;

  1. Why your adapter not reverted? Because you control it, but you dont revert it. You should revert it in your peformFiltering function:

    protected FilterResults performFiltering(CharSequence constraint) {
      String filterString = constraint.toString().toLowerCase();
      if(TextUtils.isEmpty(filterString)){
            // do restore backup data here
      }else{
           // do filter here.
      }
}

This is how i was able to solve the misery of my searching code.

on my MainActivity

public class MainActivity extends Activity {

 private List<Movie> currentMovieList = new ArrayList<Movie>();
 private List<Movie> originalMovieList = new ArrayList<Movie>();
 private CustomListAdapter adapter;
 private ListView mList;
 // Search EditText
 EditText inputSearch;

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

inputSearch = (EditText) findViewById(R.id.inputSearch);

adapter = new CustomListAdapter(this, currentMovieList);
    mList.setAdapter(adapter);


    inputSearch.addTextChangedListener(new TextWatcher() {

        public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
            // When user changed the Text

            String filterString = cs.toString().toLowerCase();
            Log.e("TAG", "filterString:" + filterString);
            currentMovieList.clear();
            if (TextUtils.isEmpty(filterString)) {
                currentMovieList.addAll(originalMovieList);
            }

            String filterableString;
            for (Movie movie : originalMovieList) {
                if (movie.getTitle().toLowerCase().contains(filterString)) {
                    currentMovieList.add(movie);
                }
                else if (String.valueOf(movie.getYear()).toLowerCase().contains(filterString))
                {
                    currentMovieList.add(movie);
                }
                else if (String.valueOf(movie.getRating()).toLowerCase().contains(filterString))
                {
                    currentMovieList.add(movie);
                }
                else if (movie.getGenre().toString().toLowerCase().contains(filterString))
                {
                    currentMovieList.add(movie);
                }
            }
            adapter.notifyDataSetChanged();
            //FLAGS Cannot resolve method 'getFilter()' here
        }

        @Override
        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,int arg3) {
            // TODO Auto-generated method stub

        }

        @Override
        public void afterTextChanged(Editable arg0) {
            // TODO Auto-generated method stub
        }
    });


}
}

And ADD this to your CustomListAdapter

public class CustomListAdapter extends BaseAdapter implements Filterable {

    private Activity activity;
 private LayoutInflater inflater;

 private List<String>originalData = null;
 // private List<String>filteredData = null;

 private List<Movie> movieItems;
 private List<Movie> originalMovieList;
 private String[] bgColors;
 ImageLoader imageLoader = MyApplication.getInstance().getImageLoader();
 private ItemFilter mFilter = new ItemFilter();


 public CustomListAdapter(Activity activity, List<Movie> movieItems) {
       this.activity = activity;
        this.movieItems = movieItems;
      // this.originalMovieList = movieItems;
      this.originalMovieList = new ArrayList<Movie>(movieItems);
      bgColors = activity.getApplicationContext().getResources().getStringArray(R.array.movie_serial_bg);
        }

    //Add Below Method
    public void reloadData(){
       this.originalMovieList = new ArrayList<Movie>(movieItems);
     notifyDataSetChanged();
        }
     @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_image, null);

    if (imageLoader == null)
        imageLoader = MyApplication.getInstance().getImageLoader();
    NetworkImageView thumbNail = (NetworkImageView) convertView.findViewById(R.id.thumbnail);

    TextView serial = (TextView) convertView.findViewById(R.id.serial);
    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
     String genreStr = "";
        for (String str : m.getGenre()) {
          genreStr += str + ", ";
     }
     genreStr = genreStr.length() > 0 ? genreStr.substring(0,
            genreStr.length() - 2) : genreStr;
        genre.setText(genreStr);

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

     String color = bgColors[position % bgColors.length];
        serial.setBackgroundColor(Color.parseColor(color));




      return convertView;
 }


            public Filter getFilter() {
                return mFilter;
            }

            private class ItemFilter extends Filter {
                @Override
                protected FilterResults performFiltering(CharSequence constraint) {

                    String filterString = constraint.toString().toLowerCase();

                    FilterResults results = new FilterResults();


                    //results.values = nlist;
                    //results.count = nlist.size();
                    results.values = originalMovieList;
                    results.count = originalMovieList.size();

                    return results;
                }

                @SuppressWarnings("unchecked")
                @Override
                protected void publishResults(CharSequence constraint, FilterResults results) {
                    //filteredData = (ArrayList<String>) results.values;
                    //movieItems = (ArrayList<Movie>) results.values;
                    movieItems.clear();
                    movieItems.addAll((ArrayList<Movie>) results.values);
                    notifyDataSetChanged();
                }

            }



}

Now thats a WRAP. Thanks to @DhavalPatel That Guy is an Android Guru. He made all this happen. -Happy Coding

标签
android
listview
android-listview
baseadapter
android-search
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