دریافت اطلاعات json از سرور و نمایش progress bar تا زمان دریافت اطلاعات

شما باید یه کلاس بسازید به صورت زیر:

 classTestAsyncextendsAsyncTask<Void,Integer,String>
{

protectedvoid onPreExecute () {
mProgressDialog = new ProgressDialog(MainActivity.this);
mProgressDialog.setTitle("عنوان");
mProgressDialog.setMessage("پیام");
mProgressDialog.setIndeterminate(false);
mProgressDialog.show();}

protectedString doInBackground(Void...arg0){
...... 
// کد دریافت جیسون از سرور رو اینجا بنویسد
......}

protectedvoid onPostExecute(String result){

mProgressDialog.dismiss();   
..... 
کدهای ثبت جسون داخل لیست ویو و یا ... رو اینجا بنویسید
.....
}
}			


بعد بصورت
newTestAsync().execute(); 
تو اکتیویتی فراخوانی کنید
همچنین 
ProgressDialog mProgressDialog;
رو قبل از 
oncreate 
اکتیویتی قرار دهید

class TestAsync extends AsyncTask<String, Void, String>
	 {
		
  @Override
  protected String doInBackground(String... params) {
	 
	newsRead();
	
	return null;
		}
  
  

  protected void onPreExecute () {
	 mProgressDialog = new ProgressDialog(NewsFragment.this);
	 mProgressDialog.setMessage("لطفا صبر کنید...");
	 mProgressDialog.setIndeterminate(false);
	 mProgressDialog.show();
	 mProgressDialog.setCancelable(false);
	 super.onPreExecute();
	 }



protected void onPostExecute(String result){
		mProgressDialog.dismiss();
	    runOnUiThread(new Runnable() {
			public void run() {
				/**
				 * Updating parsed JSON data into ListView
				 * */
				 adapter = new AdapterNews(G.tasks);
				    lstContent.setAdapter(adapter);
			}
		});
		

	   }

public void onResume() {
  adapter.notifyDataSetChanged();

	}

}
	
	public void newsRead(){
		
	    String url = "http://192.168.0.0/android/note_server/news.php";
        ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("action", "read"));
		 Log.i("LOG", params.toString());
        

        String result = Webservice.readUrl(url, params);
	 if (result != null) {
           try {
               
               JSONArray tasks = new JSONArray(result);
                 DataBaseConnection  db = new DataBaseConnection(this, "database", 5);
            final SQLiteDatabase database = db.getWritableDatabase();
               for (int i = 0; i < tasks.length(); i++) {
                   JSONObject object = tasks.getJSONObject(i);
                   StructTask task = new StructTask();
                   task.id = object.getString("news_id");
                   task.title = object.getString("news_title");
                   task.desc = object.getString("news_desc");
                   task.date = object.getString("news_date") ;     
                   database.execSQL("INSERT INTO news (news_title,news_desc,news_date) VALUES ('" + task.title + "','" + task.desc + "','" + task.date + "')");
                   G.tasks.add(task);   
               }
               
                database.close();
           }
           catch (JSONException e) {
               e.printStackTrace();
           }
       }
	   
		
	}

دوستان سلام.

طاعات و عباداتتون مورد قبول حق تعالی...

مصطفی ، بیا جواب تاپیک رو بده ، لطفا :(

چون منم مشکل علی رو دارم ، بعد یکی دو دقیقه از اینکه progressbar لود میشه کرش میکنه

اینم کد بنده:

 public class ActivityCategory extends ActivityEnhanced {

    ProgressDialog        mProgressDialog;
    static String         note_text;
    static int            note_fav;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        
        new TestAsync().execute();
    }


    class TestAsync extends AsyncTask<Void, Integer, String> {

        @Override
        protected void onPreExecute() {
            mProgressDialog = new ProgressDialog(ActivityCategory.this);
            mProgressDialog.setTitle("بروزرسانی");
            mProgressDialog.setMessage("لطفا کمی منتظر بمانید...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();
        }


        @Override
        protected String doInBackground(Void... arg0) {
            // TODO Auto-generated method stub
            populateFromServer();

            return null;
        }
    }


    protected void onPostExecute(String result) {
        Activitynote_list.adapter.notifyDataSetChanged();
        mProgressDialog.dismiss();
    }


    public static void populateFromServer() {
        String url = "http://skywebdesign.ir/note.php";
        ArrayList<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("action", "read"));
        
        final String result = Webservice.readUrl(url, params);
        if (result != null) {
            Thread thread = new Thread(new Runnable() {

                @Override
                public void run() {
                    try {

                        JSONArray note_list = new JSONArray(result);
                        for (int i = 0; i < note_list.length(); i++) {
                            JSONObject object = note_list.getJSONObject(i);

                            note_text = object.getString("note_text");
                            note_fav = object.getInt("note_fav");

                            Cursor cursor = G.database.rawQuery("SELECT * FROM Notes WHERE note_text='" + note_text + "' ", null);
                            if ( !cursor.moveToFirst()) {
                                //insert
                                G.database.execSQL("INSERT INTO Notes (note_text ,note_fav) VALUES('" + note_text + "','" + note_fav + "')");
                            }

                        }

                    }
                    catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
            });
            thread.start();

        }
    }

}

ممنون میشم راهنمایی کنید...

کدهای خطایی که دارم ایناس:

 Activity ir.mahdidev71.lovesms.ActivityCategory has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{a6b89340 V.E..... R.....ID 0,0-217,256} that was originally added here
android.view.WindowLeaked: Activity ir.mahdidev71.lovesms.ActivityCategory has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{a6b89340 V.E..... R.....ID 0,0-217,256} that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:354)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:216)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:69)
at android.app.Dialog.show(Dialog.java:281)
at ir.mahdidev71.lovesms.ActivityCategory$TestAsync.onPreExecute(ActivityCategory.java:274)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
at android.os.AsyncTask.execute(AsyncTask.java:534)
at ir.mahdidev71.lovesms.ActivityCategory.onCreate(ActivityCategory.java:262)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5041)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)