Android - 从 mysql 数据库中查看更多旧数据（不是图像），当在列表视图中滚动底部时

Posted 2023-02-22

【中文标题】Android - 从 mysql 数据库中查看更多旧数据（不是图像），当在列表视图中滚动底部时

【英文标题】：Android - view more old data (not image) from mysql database, When scroll bottom in listview

【发布时间】：2016-02-01 08:47:57

【问题描述】：

我不想在启动时第一次加载所有数据。它效率不高，所以我可以加载列表中的前 10 或 15 个项目。当我滚动它们时，会进一步加载 ListView 的行。我怎样才能做到这一点？ 这是我的代码：

public class BerandaFragment extends Fragment implements OnRefreshListener

SwipeRefreshLayout swipeContainer;

String myJSON;

private static final String TAG_RESULTS="result";
private static final String ID = "eventID";
private static final String JUDUL= "judul";
private static final String TANGGAL = "tanggal";
private static final String JAM = "jam";
private static final String LOKASI = "lokasi";
private static final String KETERANGAN = "keterangan";

JSONArray peoples = null;

ArrayList<HashMap<String, String>> personList;

ListView list;

public static BerandaFragment newInstance()

    BerandaFragment fragment = new BerandaFragment();
   return fragment;



public BerandaFragment()



@Override
public View onCreateView(LayoutInflater inflater,
        @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) 
    // TODO Auto-generated method stub
    View rootView = inflater.inflate(R.layout.fragment_beranda, container, false); 

    swipeContainer = (SwipeRefreshLayout) rootView.findViewById(R.id.swipeContainer);
    // Setup refresh listener which triggers new data loading
    swipeContainer.setOnRefreshListener(this);  
    // Configure the refreshing colors
    swipeContainer.setColorSchemeResources(android.R.color.holo_blue_bright, 
            android.R.color.holo_green_light, 
            android.R.color.holo_orange_light, 
            android.R.color.holo_red_light);

    list = (ListView) rootView.findViewById(R.id.listView);
    personList = new ArrayList<HashMap<String,String>>();
    getData();

    return rootView;



@Override
public void onAttach(Activity activity) 
    // TODO Auto-generated method stub
    super.onAttach(activity);

    ((MainActivity) activity).onSectionAttached(1);



protected void showList()
    try 
        JSONObject jsonObj = new JSONObject(myJSON);
        peoples = jsonObj.getJSONArray(TAG_RESULTS);

        for(int i=0;i<peoples.length();i++)
            JSONObject c = peoples.getJSONObject(i);
            String eventID = c.getString(ID);
            String judul = c.getString(JUDUL);
            String tanggal = c.getString(TANGGAL);
            String jam = c.getString(JAM);
            String lokasi = c.getString(LOKASI);
            String keterangan = c.getString(KETERANGAN);

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

            persons.put(ID,eventID);
            persons.put(JUDUL,judul);
            persons.put(TANGGAL,tanggal);
            persons.put(JAM,jam);
            persons.put(LOKASI,lokasi);
            persons.put(KETERANGAN,keterangan);

            personList.add(persons);
        

        Collections.sort(personList,new Comparator<HashMap<String, String>>() 
            @Override
            public int compare(HashMap<String, String> arg0,
                    HashMap<String, String> arg1) 
                // TODO Auto-generated method stub
                String id0 = arg0.get("ID");
                String id1 = arg1.get("ID");
                if (id0 == null) return -1;
                return id1.compareTo(id0);
            
        );

        ListAdapter adapter = new SimpleAdapter(
                getActivity(), personList, R.layout.list_beranda,
                new String[]ID,JUDUL,TANGGAL,JAM,LOKASI,KETERANGAN,
                new int[]R.id.eventID, R.id.judul, R.id.tanggal, R.id.jam, R.id.lokasi, R.id.keterangan
        );

        list.setAdapter(adapter);


     catch (JSONException e) 
        e.printStackTrace();
    



public void getData()
    class GetDataJSON extends AsyncTask<String, Void, String>

        @Override
        protected String doInBackground(String... params) 
            DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
            HttpPost httppost = new HttpPost("http://kpdewantika.esy.es/semua_event.php");

            // Depends on your web service
            httppost.setHeader("Content-type", "application/json");

            InputStream inputStream = null;
            String result = null;
            try 
                HttpResponse response = httpclient.execute(httppost);
                HttpEntity entity = response.getEntity();

                inputStream = entity.getContent();
                // json is UTF-8 by default
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
                StringBuilder sb = new StringBuilder();

                String line = null;
                while ((line = reader.readLine()) != null)
                
                    sb.append(line + "\n");
                
                result = sb.toString();
             catch (Exception e) 
                // Oops
            
            finally 
                tryif(inputStream != null)inputStream.close();catch(Exception squish)
            
            return result;
        

        @Override
        protected void onPostExecute(String result)
            myJSON=result;
            showList();
        
    
    GetDataJSON g = new GetDataJSON();
    g.execute();


@Override
public void onRefresh() 
    // TODO Auto-generated method stub
    new Handler().postDelayed(new Runnable() 
        @Override public void run() 
            personList.clear();
            getData();
            swipeContainer.setRefreshing(false);
        
    , 5000);

当我在底部滚动时如何在列表视图中加载更多数据行（不是图像），因为在数据库中我有直到 +100 行数据。我在互联网上看到了教程，但没有成功。也许在这里，解决了我的问题。

谢谢。

【参考方案1】：

您想从 mysql 数据库中获取数据！就像在 facebook 或 instagram 等中完成的一样 这是链接可能对您有帮助:) https://github.com/jparkie/GivesMeHopeAndroidClient/blob/new-v2/AnthologyForGMH_6.apk