Question

我已经实现了垂直滚动的列表视图，每行中都有像apple，lemon等项目，这些项目是水平滚动的。现在我的问题是我需要对所选行中的项进行排序，我需要将结果更新到该行，这里我无法将值更新到特定行。第一次我将数据从活动加载到适配器和排序值我正在加载适配器类。

这里的代码是..

public static ArrayList<GroupsModel> CustomListViewValuesArr;
        public static ArrayList<ItemsModel> ItemsArr;

        public MyDisplay_Adapter(Context a, ArrayList d) {

            context = a;
            data = d;

            inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        }

        public int getCount() {
            if (data.size() <= 0)
                return 1;
            return data.size();
        }

        public final Object getItem(int position) {
            return data.get(position);
        }

        public final long getItemId(int position) {
            return position;
        }

        public static class ViewHolder {

            public TextView tvGroupTitle, tvGroupDescription, 
            public LinearLayout imgscrollchild;

        }

        public View getView(final int position, View convertView, ViewGroup parent) {

            Log.d("getview:", "position=" + position);
            vi = convertView;
            final ViewHolder holder;

            if (convertView == null) {

                vi = inflater.inflate(R.layout.my_asset_list_item, null);
                holder = new ViewHolder();

                holder.tvGroupTitle = (TextView) vi.findViewById(R.id.tvGroupTitle);

                holder.tvGroupDescription = (TextView) vi
                        .findViewById(R.id.tvGroupDescription);
                holder.imgscrollchild = (LinearLayout) vi
                        .findViewById(R.id.imgscrollchild);

                vi.setTag(holder);

            } else {

                holder = (ViewHolder) vi.getTag();

            }
            if (data.size() <= 0) {

                vi.setVisibility(View.GONE);

            } else {

                tempValues = null;
                tempValues = (GroupsModel) data.get(position);

                holder.tvGroupTitle.setText(tempValues.getName().toString());
                holder.tvGroupDescription.setText(tempValues.getDescription()
                        .toString());


                if (tempValues.getItemmodel().size() == 0) {

                    return vi;

                } else {

                    for (int i = 0; i < tempValues.getItemmodel().size(); i++) {

                        a = i;
                        Log.i("Index", String.valueOf(i));
                        holder.imgscrollchild.addView(createimg(
                                tempValues.getItemmodel(), a));
                        Log.i("Index A", String.valueOf(a));

                    }
                }

            }
            return vi;
        }

        @TargetApi(Build.VERSION_CODES.JELLY_BEAN)
        public View createimg(final List<ItemsModel> bm, final int pos) {

            Here dynamically creating a imageview and textview


            return Hlayout;

        }



        private class Sort extends AsyncTask<String, Void, String> {

            @Override
            protected String doInBackground(String... params) {
                String json = null;

                try {

                    String url_get = "my url"

                    HttpClient httpclient = new DefaultHttpClient();
                    HttpGet httpGet = new HttpGet(url_get);
                    HttpResponse response = httpclient.execute(httpGet);
                    StatusLine statusLine = response.getStatusLine();

                    int statusCode = statusLine.getStatusCode();
                    if (statusCode == 200) {

                        HttpEntity entity = response.getEntity();
                        json = EntityUtils.toString(entity);

                        try {

                            JSONArray array = new JSONArray(json);
                            ItemsArr = new ArrayList<ItemsModel>();
                            for (int i = 0; i < array.length(); i++) {

                                JSONObject Obj = array.getJSONObject(i);

                                String GName = Obj.getString("GName");
                                String GDesc = Obj.getString("GDesc");

                                ItemsArr.add(ItemsList);

                            }

                            GroupsModel list1 = new GroupsModel();
                            list1.setItemmodel(ItemsArr);
                            CustomListViewValuesArr = new ArrayList<GroupsModel>();
                            CustomListViewValuesArr.add(list1);

                        } catch (Exception e) {
                            e.printStackTrace();
                            Log.e("Exception", e.toString());
                        }

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

            @Override
            protected void onPostExecute(String result) {

                adapter = new MyDisplay_Adapter(context,CustomListViewValuesArr);
                adapter.notifyDataSetChanged();

            }
        }



        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

        }
    }

Answer 1

您不应该在异步任务的postExecute上创建新的适配器实例。你sholud创建一个方法来改变适配器上的数据。并在PostExecute上调用它，如：

    adapter.setData(myData);

    adaptar.notifyDatasetChanged();

如果您不想这样做，如果您需要重新创建适配器，则应将其重置为：

    listView.setAdapter(adapter);

注意：代码示例可能与确切代码不同。

Answer 2

将更新的对象更新为arraylist 您可以通过清除arraylist中的所有数据并将更新的数据添加到同一列表中来完成此操作您可以通过检查要替换的对象来执行此操作并使用 adapter.notifyDataSetChanged（）;

如何更新Listview中的特定行

2 个答案: