如何設置進度條

Question

package com.example.tabactivity; 

import java.text.SimpleDateFormat; 
import java.util.ArrayList; 
import java.util.Date; 
import java.util.HashMap; 

import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.NodeList; 

import android.net.ParseException; 
import android.os.AsyncTask; 
import android.os.Bundle; 

import android.app.ActivityGroup; 
import android.app.ProgressDialog; 
import android.content.Intent; 

import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.Button; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 

public class circularlistparsing extends ActivityGroup { 

    public int currentPage = 1; 
    public ListView lisView1; 
    static final String KEY_ITEM = "docdetails"; 
    static final String KEY_ITEM2 = "info"; 
    static final String KEY_NAME1 = ""; 
    static final String KEY_NAME = "heading"; 
    static final String KEY_DATE = "date"; 
    public Button btnNext; 
    public Button btnPre; 
    public static String url = "http://dev.taxmann.com/TaxmannService/TaxmannService.asmx/GetCircularList"; 
    TextView txtreord; 
    TextView totalpage; 
    TextView pagenumber; 
    ProgressDialog dialog; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.main); 
     txtreord = (TextView) findViewById(R.id.recored); 
     totalpage = (TextView) findViewById(R.id.totalpage); 
     pagenumber = (TextView) findViewById(R.id.pagenumber); 

     // listView1 
     lisView1 = (ListView) findViewById(R.id.listView1); 
    // new YourTask().execute(); 
     // Next 
     btnNext = (Button) findViewById(R.id.btnNext); 
     // Perform action on click 
     btnNext.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       currentPage = currentPage + 1; 

    //   new YourTask().execute(); 
       ShowData(); 
       pagenumber.setText("Of" + currentPage+"]"); 
      } 
     }); 

     // Previous 
     btnPre = (Button) findViewById(R.id.btnPre); 
     // Perform action on click 
     btnPre.setOnClickListener(new View.OnClickListener() { 
      public void onClick(View v) { 
       currentPage = currentPage - 1; 

     //  new YourTask().execute(); 
       ShowData(); 
       pagenumber.setText("Of" + currentPage+"]"); 
      } 
     }); 

    // new YourTask().execute(); 
     ShowData(); 
    } 

    public void ShowData() { 
     XMLParser parser = new XMLParser(); 
     String xml = parser.getXmlFromUrl(url); // getting XML 

     Document doc = parser.getDomElement(xml); // getting DOM element 

     NodeList nl = doc.getElementsByTagName(KEY_ITEM); 

     NodeList n2 = doc.getElementsByTagName(KEY_ITEM2); 

     int displayPerPage = 10; // Per Page 
     int TotalRows = nl.getLength(); 

     txtreord.setText(TotalRows+"Records|"); // number of records 

     int indexRowStart = ((displayPerPage * currentPage) - displayPerPage); 
     int TotalPage = 0; 
     if (TotalRows <= displayPerPage) { 
      TotalPage = 1; 
     } else if ((TotalRows % displayPerPage) == 0) { 
      TotalPage = (TotalRows/displayPerPage); 
     } else { 
      TotalPage = (TotalRows/displayPerPage) + 1; // 7 
      TotalPage = (int) TotalPage; // 7 
     } 

     totalpage.setText("Page[" + TotalPage); 

     int indexRowEnd = displayPerPage * currentPage; // 5 
     if (indexRowEnd > TotalRows) { 
      indexRowEnd = TotalRows; 
     } 

     // Disabled Button Next 
     if (currentPage >= TotalPage) { 
      btnNext.setEnabled(false); 
     } else { 
      btnNext.setEnabled(true); 
     } 

     // Disabled Button Previos 
     if (currentPage <= 1) { 
      btnPre.setEnabled(false); 
     } else { 
      btnPre.setEnabled(true); 
     } 

     // Load Data from Index 
     int RowID = 1; 
     ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>(); 
     HashMap<String, String> map; 

     // RowID 
     if (currentPage > 1) { 
      RowID = (displayPerPage * (currentPage - 1)) + 1; 
     } 

     for (int i = indexRowStart; i < indexRowEnd; i++) { 
      Element e = (Element) nl.item(i); 

      Element e2 = (Element) n2.item(i); 

      String date = e2.getAttribute(KEY_DATE); 
      // adding each child node to HashMap key => value 

      map = new HashMap<String, String>(); 
      map.put("RowID", String.valueOf(RowID)); 

      map.put(KEY_DATE, date); 

      // String Heading = parser.getValue(e, KEY_NAME).replace("|", "|\n") 
      // .replace("|", ""); 
      // 

      String mytime = date; 
      SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmdd"); 
      Date myDate = null; 
      try { 
       myDate = dateFormat.parse(mytime); 

      } catch (ParseException t) { 
       t.printStackTrace(); 
      } catch (java.text.ParseException t) { 
       // TODO Auto-generated catch block 
       t.printStackTrace(); 
      } 

      SimpleDateFormat timeFormat = new SimpleDateFormat("yyyy-MM-dd"); 
      String finalDate = timeFormat.format(myDate); 

      // System.out.println("rrrrrrrrrrrrr"+finalDate); 

      String Heading = parser.getValue(e, KEY_NAME); 

      int a = Heading.indexOf("|"); 
      String beforeSubString = Heading.substring(0, a); 
      String afterSubString = Heading.substring(a, Heading.length()) 
        .replace("|", "") + "[" + finalDate + "]"; 
      // String 
      // final1="<b>"+beforeSubString+"<b>"+"|"+afterSubString.replace("|", 
      // "|\n") 
      // .replace("|", ""); 
      // String k=Html.fromHtml(final1).toString(); 
      // 
      // Html.fromHtml(final1); 

      map.put(KEY_NAME, beforeSubString); 
      map.put(KEY_NAME1, afterSubString); 

      // adding HashList to ArrayList 
      menuItems.add(map); 

      RowID = RowID + 1; 

     } 

     SimpleAdapter sAdap; 
     sAdap = new SimpleAdapter(circularlistparsing.this, menuItems, 
       R.layout.list_item, 
       new String[] { "RowID", KEY_NAME1, KEY_NAME }, new int[] { 
         R.id.ColRowID, R.id.ColName, R.id.textView1 }); 
     lisView1.setAdapter(sAdap); 

     lisView1.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, 
        long arg3) { 
       // TODO Auto-generated method stub 

       Intent i = new Intent(circularlistparsing.this, detail.class); 
       // sending data to new activity 
       // i.putExtra("product", product); 
       startActivity(i); 

      } 
     }); 




     } 





    class YourTask extends AsyncTask<Void, Void, Void> { 
     protected void onPreExecute() { 
        dialog = ProgressDialog.show(circularlistparsing.this, "", "Please wait.."); 
     } 

     protected Void doInBackground(Void... unused) { 
      try { 
       // doSomethingHeavy(); 
        // publishProgress(...); 

       ShowData(); 
      } catch(Exception e) { 
       //... 
      } 

      return null; 
     } 

     protected void onProgressUpdate(Void... unused) { 
     } 

     protected void onPostExecute(Void unused) { 
      dialog.dismiss(); 

     } 
    } 




} 

嗨請看這段代碼show data函數用於顯示數據，當我使用new YourTask（）。execute（）;代替顯示數據，然後顯示進度條，但不顯示數據，但能夠讀取數據，而當我們用戶showdata（）函數否定顯示數據時，請告訴我如何實現進度條。

Answer 1

實現此代碼

private class YourTask extends AsyncTask<Object, Integer, Object> { 

    @Override 
    protected void onPreExecute() { 

     ProgressDialog dialog = ProgressDialog.show(Activity.this, "", 
       "Loading..."); 

     super.onPreExecute(); 
    } 

    @Override 
    protected Object doInBackground(Object... params) { 
     try { 
     // doSomethingHeavy(); 
      // publishProgress(...); 

     ShowData(); 
    } catch(Exception e) { 
     //... 
    } 

    return null; 
} 

    @Override 
    protected void onProgressUpdate(Integer... values) { 
     dialog .getProgress(); 

    } 

    @Override 
    protected void onPostExecute(Object result) { 

     dialog .dismiss(); 


     super.onPostExecute(result); 
    } 
} 

Answer 2

private class YourTask extends AsyncTask<Object, Integer, Object> { 

ProgressDialog dialog = new ProgressDialog(Currentactivity.this); 
    @Override 
    protected void onPreExecute() { 
     this.dialog.setMessage("Loading..."); 
     this.dialog.show(); 
     this.dialog.setCancelable(false); 

     super.onPreExecute(); 
    } 

    @Override 
    protected Object doInBackground(Object... params) { 
     //do hard work here 
          return params; 
    } 

    @Override 
    protected void onProgressUpdate(Integer... values) { 
     progress.getProgress(); 

    } 

    @Override 
    protected void onPostExecute(Object result) { 

     progressBar.dismiss(); 


     super.onPostExecute(result); 
    } 
}