android – 使用ArrayAdapter过滤ListView而不重写getFilter方法

我试过实现它,但过滤不正常.虽然ListView会进行过滤,但它不会在数组中显示正确的项目.因此,例如,如果过滤器匹配数组中的单个行,则ListView中会显示一个项目,但显示的是错误的项目.在这种情况下,始终显示数组的第一项,而不是实际匹配输入的搜索文本的项.

这是我的ArrayAdapter的代码：

public class TitleListingArrayAdapter extends ArrayAdapter<Title> {

    private List<Title> items;
    private Context context;

    public TitleListingArrayAdapter(Context context, int textViewResourceId, List<Title> items) {
        super(context, textViewResourceId, items);
        this.items = items;
        this.context = context;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) 
    {
        View view = convertView;
        if (view == null) {
            LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            view = inflater.inflate(R.layout.titlelisting_single_row, null);
        }
        Title item = items.get(position);
        if (item!= null) {
            TextView titleView = (TextView) view.findViewById(R.id.title);            
            if (titleView != null) {
                titleView.setText(item.getName());
            }
            TextView yearView = (TextView) view.findViewById(R.id.year);
            if (yearView != null) {
                yearView.setText(String.valueOf(item.getYear())+", ");
            }
            TextView genreView = (TextView) view.findViewById(R.id.genre);
            if (genreView != null) {
                genreView.setText(item.getGenre());
            }
            TextView authorView = (TextView) view.findViewById(R.id.author);
            if (authorView != null) {
                authorView.setText(item.getAuthor());
            }
            RatingBar ratingView = (RatingBar) view.findViewById(R.id.rating);
            if (ratingView != null) {
                ratingView.setRating(item.getRating());
            }
            ImageView iconView = (ImageView) view.findViewById(R.id.list_image);
            iconView.setImageResource(lookupResourceId(context, item.getID()));            
        }
        return view;
    }

    private int lookupResourceId(Context context, String id) {
        String resourceName =  "thumb_"+id;
        return context.getResources().getIdentifier(resourceName, "drawable", context.getPackageName());
    }
}

以下是我的活动代码的相关部分：

 @Override
 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.listing);
    databaseHandler = new DatabaseHandler(this);
    listView = (ListView) findViewById(R.id.list);
    List<Title> titles = databaseHandler.getAllTitles();
    adapter = new TitleListingArrayAdapter(this, R.id.list, titles);
    listView.setAdapter(adapter);
    filterText = (EditText) findViewById(R.id.filter);
    filterText.addTextChangedListener(filterTextWatcher);
}

private TextWatcher filterTextWatcher = new TextWatcher() {
    public void afterTextChanged(Editable s) {}
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        adapter.getFilter().filter(s.toString().toLowerCase());
    }
};

Title POJO类实现toString,如下所示：

@Override
public String toString() {
    String name = this.getName() == null ? "" : this.getName().toLowerCase();
    String year = this.getYear() == null ? "" : this.getYear().toString();
    String genre = this.getGenre() == null ? "" : this.getGenre().toLowerCase();
    return name + " " +year+ " "+ genre;
}

有谁知道为什么过滤不正常以及我如何解决它？

所以看来这个answer是错误的,尽管被投票了六次.我没有使用ArrayAdapter的getFilter方法解决了这个问题.相反,我在TextWatcher实例中创建了一个新的ArrayAdapter,如下所示：

private TextWatcher filterTextWatcher = new TextWatcher() {
     public void afterTextChanged(Editable s) {}
     public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
     public void onTextChanged(CharSequence s, int start, int before, int count) {
         if (!s.toString().equals("")) {
              List<Title> filteredTitles = new ArrayList<Title>();
              for (int i=0; i<titles.size(); i++) {
                   if (titles.get(i).toString().contains(s)) {
                       filteredTitles.add(titles.get(i));                   
                   }            
              }
              adapter = new TitleListingArrayAdapter(TitleListingActivity.this, R.id.list, filteredTitles);
              listView.setAdapter(adapter);
         }
         else {
              adapter = new TitleListingArrayAdapter(TitleListingActivity.this, R.id.list, titles);
              listView.setAdapter(adapter);             
         }
    }
};

请注意,我还移动了声明List< Title> fromCreate中的标题,并使其成为我的Activity类的成员变量,以便可以在filterTextWatcher的onTextChanged方法中访问它.