如何將ProgressDialog添加到此代碼

我想爲此代碼添加進度對話框，因此當我單擊按鈕加載此活動時，它不會掛起或在幾秒鐘內顯示黑屏。它也必須在一個異步任務？我願意用異步任務會嘗試它只是我只是tryed幾次，我沒有得到它的工作如何將ProgressDialog添加到此代碼

package net.thinkbin; 

import java.util.ArrayList; 
import java.util.HashMap; 

import org.json.JSONArray; 
import org.json.JSONException; 
import org.json.JSONObject; 

import android.app.ListActivity; 
import android.content.Intent; 
import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.Button; 
import android.widget.ListAdapter; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 

public class entertainment extends ListActivity { 

private static final String TITLE = "Title"; 
private static final String AUTHOR = "Author"; 
private static final String VIEWS = "Views"; 
private static final String RATES = "Rates"; 
private static final String CONTENT = "Content"; 

JSONArray ideas = null; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 


    super.onCreate(savedInstanceState); 
    setContentView(R.layout.listplaceholder3); 


    Button view = (Button) findViewById(R.id.button1); 
    view.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      startActivity(new Intent("net.thinkbin.TUTORIAL1")); 
      overridePendingTransition(0, 0); 
      finish(); 
     } 
    }); 

    Button share = (Button) findViewById(R.id.button2); 
    share.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      startActivity(new Intent("net.thinkbin.SHARE")); 
      overridePendingTransition(0, 0); 
      finish(); 
     } 
    }); 

    Button menu = (Button) findViewById(R.id.buttonhome); 
    menu.setOnClickListener(new View.OnClickListener() { 

     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      startActivity(new Intent("net.thinkbin.MENU")); 
      overridePendingTransition(0, 0); 
      finish(); 
     } 

    }); 

    ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>(); 


    JSONObject json =  JSONfunctions.getJSONfromURL("http://www.thinkbin.net/include/api/index.php?cat=Entertainment&type=Views&i=10"); 

    try{ 

      ideas = json.getJSONArray("Ideas"); 

      // looping through All Contacts 
     for(int i = 0; i < ideas.length(); i++){ 
      JSONObject c = ideas.getJSONObject(i); 

      // Storing each json item in variable 
      String title = c.getString(TITLE); 
      String author = c.getString(AUTHOR); 
      String views = c.getString(VIEWS); 
      String rates = c.getString(RATES); 
      String content = c.getString(CONTENT); 

      // creating new HashMap 
      HashMap<String, String> map = new HashMap<String, String>(); 

      // adding each child node to HashMap key => value 
      map.put(TITLE, "Title: " + title); 
      map.put(AUTHOR, "Author: " + author); 
      map.put(VIEWS, "Views: " + views); 
      map.put(RATES, "Rates: " + rates); 
      map.put(CONTENT, content); 

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


     } 


    }catch(JSONException e)  { 
     Log.e("log_tag", "Error parsing data "+e.toString()); 
    } 

    ListAdapter adapter = new SimpleAdapter(this, mylist , R.layout.main2, 
        new String[] { TITLE, AUTHOR, VIEWS, RATES, CONTENT }, 
        new int[] { R.id.item_title, R.id.item_subtitle, R.id.item3, R.id.item4, R.id.item5 }); 

    setListAdapter(adapter); 

// selecting single ListView item 
    ListView lv = getListView(); 

    // Launching new screen on Selecting Single ListItem 
    lv.setOnItemClickListener(new OnItemClickListener() { 

     public void onItemClick(AdapterView<?> parent, View view, 
       int position, long id) { 
      // getting values from selected ListItem 
      String Title2 = ((TextView) view.findViewById(R.id.item_title)).getText().toString(); 
      String Author2 = ((TextView) view.findViewById(R.id.item_subtitle)).getText().toString(); 
      String Content2 = ((TextView) view.findViewById(R.id.item5)).getText().toString(); 

      Intent in = new Intent(getApplicationContext(), idea.class); 
      overridePendingTransition(0, 0); 
      in.putExtra(TITLE, Title2); 
      in.putExtra(AUTHOR, Author2); 
      in.putExtra(CONTENT, Content2); 


      startActivity(in); 


     } 
    }); 

}      
}

來源

2012-04-03 Jelle Breuer

我建議你重新考慮AsyncTask，使用onPreExecute（）和onPostExecute（）方法來顯示和隱藏你的對話框，因爲這些方法是在UI線程中執行的，應該沒有問題。 – 2012-04-03 15:13:10

肯定不想試試它只有我希望有人可以編輯我的代碼有點讓我開始 – 2012-04-03 15:17:20

還是我必須讓我的JSONfuncions類在異步任務？ – 2012-04-03 15:29:47

它不必是AsyncTask就可以讓你Activity implements Runnable，然後調用Thread.start(this)從onClick將您的代碼放入您的Activity的void run() {...}。然後在Thread.start()之前顯示對話框，並在任務結束時關閉對話框。但是，請注意，在查殺時，您必須執行runOnUiThread(new Runnable() { public void run() { dismissDialog(YOUR_DLG)) }，因爲只能從UI線程控制UI。

雖然AsyncTask更好。

來源

2012-04-03 15:00:10

我用下面的代碼顯示ProgressDialog，

progDailog = ProgressDialog.show(loginAct,"Process ", "please wait....",true,true); 
new Thread (new Runnable() 
{  
     public void run()  
     {  
      // your code goes here  
     } 
}).start(); 

Handler progressHandler = new Handler() 
{  
     public void handleMessage(Message msg1)  
     {   
      progDailog.dismiss();   
     } 
}

來源

2012-04-03 15:09:44 Lucifer

您的問題，最好的解決辦法是使用異步任務。由於異步任務有幾個方法，如

onPreExecute() - 在這裏你初始化你的任務。
doInBackground() - 在這裏你可以讓你的網絡命中。即從服務器獲取數據。
onPostExecute() - 在這裏您處理從服務器收到的響應以及與UI相關的任務。

除了上面它也有一個方法

onProgressUpdate() - 其可用於發佈完成的任務的進度。

這是Link，顯示如何使用AsyncTask示例。

來源

2012-04-03 16:19:21

如何將ProgressDialog添加到此代碼

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