Question

我创建了可扩展列表视图。它包含父项和子项。从Json检索父值和子值。子项正在加载正常，但只有Json中的最后一个值显示在父项中。如何在父母中显示所有项目？

class AsyncT1 extends AsyncTask<String, Void, String> {
        @Override
        protected String doInBackground(String... params) {
            HttpClient httpclient = new DefaultHttpClient();
            HttpPost httppost = new HttpPost("http://abservetechdemo.com/projects/android/food_app/public/mobile/restaurant/resdetails");

            try {

                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                nameValuePairs.add(new BasicNameValuePair("res_id","1"));
//                nameValuePairs.add(new BasicNameValuePair("status","veg"));
                nameValuePairs.add(new BasicNameValuePair("main_cat",childname));

                // nameValuePairs.add(new BasicNameValuePair("group_id", group_id));
                httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                Log.e("mainToPost", "mainToPost" + nameValuePairs.toString());


         /* execute */

                // Execute HTTP Post Request
                HttpResponse response = httpclient.execute(httppost);
                InputStream inputStream = response.getEntity().getContent();
                InputStreamToStringExample str = new InputStreamToStringExample();
                String responseServer = str.getStringFromInputStream(inputStream);
                Log.d("response", "response -----" + responseServer);

                JSONObject jsonRootObject = new JSONObject(responseServer);
                JSONObject jsonobject = jsonRootObject.getJSONObject("restaurants");

                JSONObject questionMark = jsonRootObject.getJSONObject("restaurants");
                Iterator keys = questionMark.keys();
                Log.d("key--", String.valueOf(keys));

                while(keys.hasNext()) {
                    // loop to get the dynamic key
                    String k = (String)keys.next();

                    Group gru = new Group();
                    gru.setName(k);
                    // do something here with the value...
                    final ArrayList<Group> list = new ArrayList<Group>();
                    ArrayList<Child> ch_list;
                    ch_list = new ArrayList<Child>();
                    JSONArray ja = questionMark.getJSONArray(k);


                    for (int i = 0; i < ja.length(); i++) {

                        JSONObject jo = ja.getJSONObject(i);

                        Child ch = new Child();
                        ch.setName(jo.getString("item_name"));
                       ch_list.add(ch);
                    } // for loop end


                    gru.setItems(ch_list);
                    list.add(gru);
                   getActivity(). runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            adapter = new ExpandListAdapter(
                                    getActivity(), list);
                            ExpandList.setAdapter(adapter);

                        }});

                }

            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(String aVoid) {
            super.onPostExecute(aVoid);

        }
    }

Answer 1

这样做：

class AsyncT1 extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {

    //YOUR CODE

    try 
    {
        // YOUR CODE
        Log.d("key--", String.valueOf(keys));

        // better to initialize main list out side any loop so it will 
        //not get initialized with every iteration of loop..!!

        final ArrayList<Group> list = new ArrayList<Group>();

        while (keys.hasNext()) {
            // loop to get the dynamic key
            String k = (String) keys.next();
            Group gru = new Group();
            gru.setName(k);
            // do something here with the value...
            ArrayList<Child> ch_list;
            ch_list = new ArrayList<Child>();
            JSONArray ja = questionMark.getJSONArray(k);

            for (int i = 0; i < ja.length(); i++) {

                JSONObject jo = ja.getJSONObject(i);

                Child ch = new Child();
                ch.setName(jo.getString("item_name"));
                ch_list.add(ch);
            } // for loop end
            gru.setItems(ch_list);
            list.add(gru);
        }
        // set the adapter after the loop has finished the execution
        getActivity().runOnUiThread(new Runnable() {
            @Override
            public void run() {
                adapter = new ExpandListAdapter(
                        getActivity(), list);
                ExpandList.setAdapter(adapter);
            }
        });

    } catch (Exception e) {
        e.printStackTrace();
    }
    return null;
}

@Override
protected void onPostExecute(String aVoid) {
    super.onPostExecute(aVoid);

}
}

此处// YOUR CODE表示您无需更改代码中已存在的代码。

我所做的更改主要包括：您不需要在内部设置适配器 while循环让列表将所有数据初始化，然后我们将将适配器设置为外部 while loop

最后的json值显示在android的expandableistview中

1 个答案: