在 Android 应用程序中使用 ListView 按字母顺序过滤 ListAdapter

Question

我正在开发一个安卓应用程序。该应用在 Listview 中使用 json 和 ListAdpter 绑定数据。现在我想根据用户在搜索框中写信来过滤这些数据。我试图这样做，但由于列表视图中绑定了多个数据，我不知道如何过滤它。以下是我的代码：

private void getdatalatlog(double latitude, double longitude) {
    // TODO Auto-generated method stub
    //value=5;
    String url = "http://bizzcoder.co.in/php/comments.php?latitude='"+latitude+"'&longitude='"+longitude+"'&value='"+value+"'";
    aq.progress(R.id.progressBar1).ajax(url, JSONObject.class, this,"jsonCallback");

}


public void jsonCallback(String url, JSONObject json, AjaxStatus status) {  


    if (json != null) { 

    List<String> city = new ArrayList<String>();
    mCommentList = new ArrayList<HashMap<String, String>>();

        Gson gson = new GsonBuilder().create();
        try {

            JSONArray jsonResponse = json.getJSONArray("posts");
            city = gson.fromJson(jsonResponse.toString(),List.class);
            for (int i = 0; i < jsonResponse.length(); i++) {
                JSONObject c = jsonResponse.getJSONObject(i);       

                String title = c.getString(TAG_TITLE);
                String content = c.getString(TAG_MESSAGE);
                String username = c.getString(TAG_USERNAME);
                String lat = c.getString(TAG_LATITUDE);
                String log = c.getString(TAG_LONGITUDE);
                String cont = c.getString(TAG_CONTACT);

                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();

                map.put(TAG_TITLE, title);
                map.put(TAG_MESSAGE, content);
                map.put(TAG_USERNAME, username);
                map.put(TAG_LATITUDE, lat);
                map.put(TAG_LONGITUDE, log);
                map.put(TAG_CONTACT, cont);
                    // adding HashList to ArrayList
            mCommentList.add(map);


            }
        } 
        catch (JSONException e) {

            Toast.makeText(aq.getContext(), "Error in parsing JSON", Toast.LENGTH_LONG).show();
        }
        catch (Exception e) {
            Toast.makeText(aq.getContext(), "Something went wrong", Toast.LENGTH_LONG).show();
        }

        ListAdapter adapter = new SimpleAdapter(this, mCommentList,
                R.layout.single_post, new String[] { TAG_TITLE,TAG_USERNAME ,TAG_CONTACT ,TAG_MESSAGE ,TAG_LATITUDE , TAG_LONGITUDE 
                        }, new int[] { R.id.shop_name,R.id.address,R.id.contact,R.id.distance,R.id.latitude,R.id.longitude });


        setListAdapter(adapter);

        /**
         * Enabling Search Filter
         * */
        inputSearch.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                // When user changed the Text
                Shopdetail.this.adapter.getFilter().filter(cs);   
            }

            @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                          
            }
        });

        ListView lv = getListView();    
        lv.setOnItemClickListener(new OnItemClickListener() {


            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {

                Intent intent = new Intent();
                 Bundle b = new Bundle();


                 String name= ((TextView) view.findViewById(R.id.shop_name)).getText().toString()+" , "+((TextView) view.findViewById(R.id.contact)).getText().toString();

                 String lati= ((TextView) view.findViewById(R.id.latitude)).getText().toString();

                 String longi= ((TextView) view.findViewById(R.id.longitude)).getText().toString();

                 b.putString("shop",name);
                 b.putString("lati",lati);
                 b.putString("long",longi);
                intent.setClass(Shopdetail.this, Mapview.class);
                intent.putExtras(b);
                startActivity(intent);
            }
        });
} 
     }

listview 中绑定了多个详细信息，例如商店名称、联系电话、地址等。我只想按商店名称过滤它。但我在 getfilter() 方法下面划了红线。

Answer 1

其实我是这样做的（EditText 在工具栏上，但它可以在你想要的任何地方）：

            inputSearch = (EditText) findViewById(R.id.inputSearch);
            inputSearch.addTextChangedListener(new TextWatcher() {

                @Override
                public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                    // When user changed the Text
                    adapter.getFilter().filter(cs.toString());
                }

                @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
                }
            });

编辑：

要过滤自定义 Base 适配器，您必须将其与适配器放在类中：

    List<Fanfic> fanfics;
    private List<Fanfic>filteredData = null;
    private ItemFilter mFilter = new ItemFilter();

您需要 2 个列表 - 第一个包含所有数据，第二个包含过滤数据

在所有方法中，您必须使用过滤数据（在构造函数中，getCount，getItem，getItemId），而不是过滤数据，您只需填写构造函数。

这里是 ItemFilter 类：

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

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

            FilterResults results = new FilterResults();

            final List<Fanfic> list = fanfics;

            int count = list.size();
            final ArrayList<Fanfic> nlist = new ArrayList<Fanfic>(count);

            String filterableString ;

            for (int i = 0; i < count; i++) {
                filterableString = list.get(i).getName();
                if (filterableString.toLowerCase().startsWith(filterString)) {
                    nlist.add(list.get(i));
                }
            }

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

            return results;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            filteredData = (ArrayList<Fanfic>) results.values;
            notifyDataSetChanged();
        }

    }

并将此方法添加到您的适配器：

public Filter getFilter() {
    return mFilter;
}

最后一件事，你必须实现 Filterable。