我在哪裏可以顯示加載過程的功能？

-1

這是我的Java文件。

我必須在哪裏放置函數來顯示加載過程？

public class AksesServerActivity extends ListActivity { 
private static String link_url = "http://plnskh.zz.mu/android/berita/cekdaftar.php";  
private static final String AR_ID = "id"; 
private static final String AR_JUDUL = "judul"; 
private static final String AR_CONTENT = "content"; 
JSONArray artikel = null; 
ArrayList<HashMap<String, String>> daftar_artikel = new ArrayList<HashMap<String, String>>(); 
@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
    JSONParser jParser = new JSONParser(); 
    JSONObject json = jParser.AmbilJson(link_url); 
    try { 
     artikel = json.getJSONArray("artikel");   
     for(int i = 0; i < artikel.length(); i++){ 
      JSONObject ar = artikel.getJSONObject(i);   
      String id = ar.getString(AR_ID); 
      String judul = ar.getString(AR_JUDUL); 
      String content = ar.getString(AR_CONTENT).substring(0,100)+"...(baca selengkapnya)";     
      HashMap<String, String> map = new HashMap<String, String>(); 
      map.put(AR_ID, id); 
      map.put(AR_JUDUL, judul); 
      map.put(AR_CONTENT, content); 
      daftar_artikel.add(map); 
     } 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 
    this.adapter_listview(); 
} 

public void adapter_listview() { 
    ListAdapter adapter = new SimpleAdapter(this, daftar_artikel, 
      R.layout.list_item, 
      new String[] { AR_JUDUL, AR_CONTENT, AR_ID}, new int[] { 
        R.id.judul, R.id.content, R.id.kode}); 
    setListAdapter(adapter); 
    ListView lv = getListView(); 
    lv.setOnItemClickListener(new OnItemClickListener() { 
     @Override 
     public void onItemClick(AdapterView<?> parent, View view,int position, long id) { 
      String kode = ((TextView) view.findViewById(R.id.kode)).getText().toString();    
      Intent in = new Intent(AksesServerActivity.this, DetailAksesServer.class); 
      in.putExtra(AR_ID, kode); 
      startActivity(in); 
     } 
    });  
} 
}

來源

2013-10-19 user2896939

必須使用AsyncTask類，重寫doInBackground方法來執行你的DATABSE取，onPreExecute方法來顯示你的裝載和onPostExecute將其隱藏。你可以參考AsynTask process和AsynTask post更多信息

來源

2013-10-19 04:22:17 xhamr

public class LongOperation extends AsyncTask<String, String, String> 
{ 
    ProgressDialog pdialog; 
    @Override 
    protected String doInBackground(String... params) { 

     JSONParser jParser = new JSONParser(); 
     JSONObject json = jParser.AmbilJson(link_url); 
     try { 
      artikel = json.getJSONArray("artikel");   
      for(int i = 0; i < artikel.length(); i++){ 
       JSONObject ar = artikel.getJSONObject(i);   
       String id = ar.getString(AR_ID); 
       String judul = ar.getString(AR_JUDUL); 
       String content = ar.getString(AR_CONTENT).substring(0,100)+"...(baca selengkapnya)";     
       HashMap<String, String> map = new HashMap<String, String>(); 
       map.put(AR_ID, id); 
       map.put(AR_JUDUL, judul); 
       map.put(AR_CONTENT, content); 
       daftar_artikel.add(map); 
      } 
     } catch (JSONException e) { 
      e.printStackTrace(); 
     } 

     return null; 
    } 

    @Override 
    protected void onPostExecute(String result) { 
     // TODO Auto-generated method stub 
     super.onPostExecute(result); 
     pdialog.dismiss(); 
     this.adapter_listview(); 
    } 

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

     pdialog = new ProgressDialog(NewsActivity.this); 
     pdialog.setMessage("Loading"); 
     pdialog.show(); 
    } 
}

更多的澄清有關異步任務和它的方法，檢查here

來源

2013-10-19 04:23:47

我在哪裏可以顯示加載過程的功能？

回答

相關問題