Question

我有一个ListView，它显示从服务器获取的项目列表。我用EditText创建了一个ALertDialog，它接受用户输入并进行API调用，并将此用户输入添加到items服务器。新的更新项目再次显示在ListView中。

当列表显示正确显示时，问题是最终的。但是当用户输入发布时，它会随机显示，而不是显示在列表的末尾。

这是我的代码： -

builder.setPositiveButton("Post", new DialogInterface.OnClickListener()
            {

                public void onClick(DialogInterface dialog, int id) 
                {

                    boolean worked = true;
                    postedString = input1.getText().toString();

                    if(postedString .length()==0 || postedString =="")
                    {

                        Toast.makeText(NewsDetails.this, "Please enter a comment.", Toast.LENGTH_LONG).show();
                        input1.findFocus();
                        worked = false;
                    }
                    else if(worked && postedString !="")
                    {

                        dialog.dismiss();
                        pd = new ProgressDialog(Details.this);
                        pd.setMessage("Posting..");
                        pd.show();
                        pd.setCancelable(true);

                        Post(postedString );
                    }
                }
    private void Post(String postedString)
                    {
                        // TODO Auto-generated method stub

                        String postCommentUrl  = EndPoints.PostURL;

                        new PostComment().execute(postCommentUrl);
                        String getRequestForComments = myurl;
                        new FetchItems().execute(getRequest);

                    }
            })



    private class PostComment extends AsyncTask<String, String, String>
        {



            @Override
            protected String doInBackground(String... params)
            {
                // TODO Auto-generated method stub

                HttpResponse response =null;
                String resultString = "";
                String myResponseBody = "" ;
                // Creating HTTP client
                HttpClient httpClient = new DefaultHttpClient();
                // Creating HTTP Post
                HttpPost request = new HttpPost(params[0]);

                List<NameValuePair> nameValuePair = new ArrayList<NameValuePair>(8);
                nameValuePair.add(my params)
                try 
                {
                    request.setEntity(new UrlEncodedFormEntity(nameValuePair));
                    response = httpClient.execute(request);
                    if(response.getStatusLine().getStatusCode()== 200)
                    {
                        HttpEntity entity = response.getEntity();
                        if (entity != null)
                        {

                            InputStream inputStream = entity.getContent();
                            myResponseBody = convertToString(inputStream);
                        }
                    }
                }
                catch(Exception e)
                {
                    e.printStackTrace();
                }
                return myResponseBody;
            }



    private class FetchItems extends AsyncTask<String,String, Void> 
    {
        // TODO Auto-generated method stub

        @Override
        protected Void doInBackground(String... params) 
        {
            // TODO Auto-generated method stub
            HttpResponse response =null;
            String resultString = "";
            String myResponseBody = "" ;
            // Creating HTTP client
            HttpClient httpClient = new DefaultHttpClient();
            // Creating HTTP Post
            HttpGet request = new HttpGet(params[0]);


            try 
            {
                response = httpClient.execute(request);
                if(response.getStatusLine().getStatusCode()== 200)
                {
                    HttpEntity entity = response.getEntity();
                    if (entity != null)
                    {

                        InputStream inputStream = entity.getContent();
                        myResponseBody = convertToString(inputStream);

                        try {
                            JSONObject jsonResponse = new JSONObject(myResponseBody);
                            JSONArray mtUsers = jsonResponse.getJSONArray("ListOfComments");
                            for (int i = 0; i < mtUsers.length(); i++)
                            {
                                JSONObject menuObject = mtUsers.getJSONObject(i);

                                String authorName= parsed code


                                map = new HashMap<String,String>();
                                map.put(my params)

                                myList.add(map);

                            }
                        } catch (JSONException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                        Collections.reverse(myList);
                        getList = myList;
                    }
                }
            }
            catch(Exception e)
            {
            }
            return null;

        }





        @Override
        protected void onPostExecute(Void result) 
        {
            // TODO Auto-generated method stub
            super.onPostExecute(result);

            if(pd!=null && pd.isShowing())
                pd.dismiss();

            itemsAdapter = (ListAdapter) new CAdapter(Details.this, getList);

            myList.setAdapter(itemsAdapter);
            ListViewInScrollViewHeight.setListViewHeightBasedOnChildren(myList);
            myList.invalidate();
            myList.refreshDrawableState();
            myList.post(new Runnable() 
            {

                @Override
                public void run() 
                {
                    // TODO Auto-generated method stub
                    myList.setSelection(itemsAdapter.getCount()-1);

                }
            });
        }

//适配器

public View getView(int position, View convertView, ViewGroup parent)
{
    View vi=convertView;
    LazyViewHolder viewHolder;
    if(convertView==null)
    {
        vi = inflater.inflate(com.zevenpooja.attini.R.layout.comments_row,null);

        viewHolder = new LazyViewHolder();

        viewHolder.title = (TextView)vi.findViewById(R.id.title); // title
        viewHolder.description = (TextView)vi.findViewById(R.id.description); // artist name
        viewHolder.pubDate = (TextView)vi.findViewById(R.id.txtPubDate);
        vi.setTag(viewHolder);
    }
    else
    {
        viewHolder = (LazyViewHolder)vi.getTag();
    }

    HashMap<String, String> song = new HashMap<String, String>();
    song = data.get(position);

    // Setting all values in listview
    //Set title
    String myTitle =song.get(Details.AUTHORDISPLAYNAME);
    StringBuilder sb = new StringBuilder(myTitle);

    int i = 0;
    while ((i = sb.indexOf(" ", i + 40)) != -1) 
    {
        sb.replace(i, i + 1, "\n");
    }

    viewHolder.title.setText(sb.toString());

    //Set description
    String mydescription = song.get(Details.TEXT);


    viewHolder.description.setText(mydescription);

    // Set image
    //   String bitmapUrl = song.get(Home.avatarUrl);

    //Set date
    String myDate = song.get(NewsDetails.DATEUPDATED);

    final String OLD_FORMAT = "yyyy-MM-dd'T'HH:mm:ss'Z'";
    final String NEW_FORMAT = "HH:mm, MMMM dd, yyyy";

    String newDate ="";

    SimpleDateFormat sdf = new SimpleDateFormat(OLD_FORMAT);
    try
    {
        Date d = sdf.parse(myDate);
        sdf.applyLocalizedPattern(NEW_FORMAT);
        newDate = sdf.format(d);
        viewHolder.pubDate.setText(newDate);
    } 
    catch (java.text.ParseException e)
    {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }       

    return vi;
}

Answer 1

您检查了返回的JSONArray吗？它是否包含右边的项目？如果不是，那么问题是服务器端脚本如何查询数据库。例如，如果您要查询mysql数据库，则可以使用ORDER BY id DESC按ID对结果进行排序。

添加新项目android后，列表项混淆了

1 个答案: