TextWatcher 使用自定义 toString() 筛选对象

Question

我正在尝试从ListActivity中过滤自定义列表视图。问题是，当筛选器实际工作时，列表视图未正确显示。

例如，如果我有 3 个项目，每个项目分别以 a、b、c、da、db 开头，则键入 e 将显示列表视图为空。但是，当我输入 b 时，它会显示 a，当我输入 c 时，它会显示 a。当我输入d时，它将显示a，b。我不完全确定我做错了什么，或者我错过了什么来解决这个问题。该位置似乎没有传递给过滤器，但是我将如何执行此操作？

下面是我的阵列适配器：

private class SiteAdapter extends ArrayAdapter<Site> {
    private ArrayList<Site> sites;
    public SiteAdapter(Context context, int textViewResourceId, ArrayList<Site> sites) {
        super(context, textViewResourceId, sites);
        this.sites = sites;
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View v = convertView;
        if (v == null) {
            LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            v = vi.inflate(R.layout.row, null);
        }
        Site s = this.sites.get(position);
        if (s != null) {
            TextView tt = (TextView) v.findViewById(R.id.toptext);
            TextView bt = (TextView) v.findViewById(R.id.bottomtext);
            TextView rt = (TextView) v.findViewById(R.id.statustext);
            if (tt != null) {
                tt.setText("sup2");
            }
            if (bt != null) {
                bt.setText("sup");
            }
            if (rt != null) {
                rt.setText("sup");
            }
        }
        v.setOnClickListener(new OnItemClickListener(position));
        return v;
    }
    private class OnItemClickListener implements OnClickListener{           
        private int mPosition;
        OnItemClickListener(int position){
                mPosition = position;
        }
        @Override
        public void onClick(View arg0) {
            //Log.v("MainActivity", sites.get(mPosition).getURL());
            Intent intent = new Intent(getBaseContext(), Wee.class);
            startActivityForResult(intent,1);
        }               
    }
}

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) {
        site_adapter.getFilter().filter(s);
    }
};
@Override
protected void onDestroy() {
    super.onDestroy();
    filterText.removeTextChangedListener(filterTextWatcher);
}

我的对象类具有：

@Override
public String toString() {
    return new StringBuilder()
    .append(this.SEARCHABLE).toString();
}

我把它归结为正确过滤，但现在过滤器在删除或清空文本框时没有将列表视图返回到其原始状态。我从ListView中的自定义过滤ArrayAdapter中获得了示例：

private class SiteFilter extends Filter {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {
            FilterResults results = new FilterResults();
            String prefix = constraint.toString().toLowerCase();
            if (prefix == null || prefix.length() == 0) {
                ArrayList<Site> list = new ArrayList<Site>(sites);
                results.values = list;
                results.count = list.size();
            } else {
                final ArrayList<Site> list = new ArrayList<Site>(sites);
                final ArrayList<Site> nlist = new ArrayList<Site>();
                int count = list.size();
                for (int i = 0; i < count; i++) {
                    final Site pkmn = list.get(i);
                    final String value = pkmn.getFILTERABLETEXT().toLowerCase();
                    if (value.startsWith(prefix)) {
                        nlist.add(pkmn);
                    }
                }
                results.values = nlist;
                results.count = nlist.size();
            }
            return results;
        }
        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            filtered_sites = (ArrayList<Site>) results.values;
            clear();
            int count = filtered_sites.size();
            for (int i = 0; i < count; i++) {
                Site pkmn = (Site) filtered_sites.get(i);
                add(pkmn);
            }
        }
    }

钱德拉的建议：

@SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            filtered_sites = (ArrayList<Site>) results.values;
            site_adapter.notifyDataSetChanged();
            clear();
            int count = filtered_sites.size();
            for (int i = 0; i < count; i++) {
                Site pkmn = (Site) filtered_sites.get(i);
                add(pkmn);
                Log.d("OMGOMGOMG",pkmn.getURL());
            }
            site_adapter.notifyDataSetInvalidated();
        }

Answer 1

我认为它不会通知数据的变化。在方法 onTextChanged 中添加notifyDataSetChanged

public void onTextChanged(CharSequence s, int start, int before, int count) {
    site_adapter.getFilter().filter(s);
    site_adapter.notifyDataSetChanged(); 
}