在列表视图的Andr​​oid增加额外项目

问题描述

我会想添加一个额外的项目我的列表视图。现在，我设法列出所有从PHP类别，但我会想多加一个全部类别列表视图。例如：

How will i do that??

CategoryActivity.java

 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Hashmap for ListView
        ArrayList<HashMap<String, String>> cateList = new ArrayList<HashMap<String, String>>();
        // Creating JSON Parser instance
        JSONParserList jParser = new JSONParserList();
        // getting JSON string from URL
        JSONObject json = jParser.getJSONFromUrl(url);

        try {
            // Getting Array of Categories

            catelist = json.getJSONArray(TAG_CATELIST);

            // looping through All Categories
            for(int i = 0; i < catelist.length(); i++){
                JSONObject c = catelist.getJSONObject(i);

             // Storing each json item in variable

                String categories = c.getString(TAG_CATEGORIES);

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

                map.put(TAG_CATEGORIES, categories);

                cateList.add(map);
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }
        /**
         * Updating parsed JSON data into ListView
         * */           
        ListAdapter adapter = new SimpleAdapter(this, cateList,
                R.layout.list_cate,
                new String[] {TAG_CATEGORIES }, new int[] {
                        R.id.categories});
        setListAdapter(adapter);
 }  

categories.php

    $query = 'SELECT categories FROM shop GROUP BY categories';
    $res = mysql_query($query) or die(mysql_error());

    $catelist['catelist'] = array();
    while ($output = mysql_fetch_assoc ($res)) {
    $catelist['catelist'][]=$output;
    }
    echo json_encode($catelist);

解决方案

simply call the following to add more new item(s):

SimpleAdapter adapter = new SimpleAdapter(this, cateList, R.layout.list_cate,
                new String[] {TAG_CATEGORIES }, new int[] {R.id.categories});

setListAdapter(adapter);


//to add more new items in list
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_CATEGORIES, "All");
cateList.add(map);

//refreshing the contents of list to show newly added items
adapter.notifyDataSetChanged();

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