How to ensure all the AsyncTask are completed?

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Mobile

Android

Eclipse

Async

Task

I have 2 AsyncTask, one was nested inside other in the loop, I want to invisible the progress bar and also do other functions after both AsyncTask is finished. I don't know how to do that? Please help me.

public class GalleryFragment extends Fragment {
	
	ProgressBar progressBar;
	
	JSONParser jsonParser = new JSONParser();
	    
	private static String url_download_photo_id = Global.url+"/clubs/download_photo_id.php";
	private static String url_download_photo = Global.url+"/clubs/download_photo.php";
	 
	private static final String TAG_SUCCESS = "success";
	private static final String TAG_CLUBS = "clubs";
	private static final String TAG_PHOTO = "photo";
	private static final String TAG_PHOTO_ID = "photo_id";
	 
	 // News JSONArray
	JSONArray clubs = null;
	
	AsyncTask<String, String, String> a,b;
	 
	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
			Bundle savedInstanceState) {
		View rootView = inflater.inflate(R.layout.fragment_gallery, container, false);
		
	    //Progress Bar
		progressBar = (ProgressBar) rootView.findViewById( R.id.progressBar1); 

		a = new DownloadPhotoId().execute();

		return rootView;
	}
	
    class DownloadPhotoId extends AsyncTask<String, String, String> {
		
        protected String doInBackground(String... args) {
        	
        	Log.v("DownloadPhotoId","doInBackground");
  
            // check for success tag
            try {
            	
                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("club_id", ClubActivity.club_id));
     
                JSONObject json = jsonParser.makeHttpRequest(url_download_photo_id,
                "GET", params);
     
                // check log cat for response
                Log.d("Download Image Id", json.toString());
                
                int success = json.getInt(TAG_SUCCESS);
 
                if (success == 1) {       
                	
               	 getActivity().runOnUiThread(new Runnable() {
          		    public void run() {
          		       progressBar.setVisibility(View.VISIBLE);
          		    }
          		});
                	
                	clubs = json.getJSONArray(TAG_CLUBS);
               	 
               	 	progressBar.setMax(clubs.length());

               	 	int i;
                    for (i = 0; i < clubs.length(); i++) {
                   	 JSONObject c = clubs.getJSONObject(i);
                 
                        // Storing each json item in variable
                        String photo_id = c.getString(TAG_PHOTO_ID);

            			Log.v("Photo id"+i,""+photo_id);

                        b = new DownloadPhoto(photo_id,i).execute();
       
                        progressBar.setProgress(i+1);

                    }
                }
                else 
                {
                	
                }
            
            } catch (JSONException e) {
            	problem();
                e.printStackTrace();             
            }
            catch(Exception e)
            {
            	problem();
            	Log.v("Exception",""+e);           	
            }
       
            return null;
        }
 
        protected void onPostExecute(String file_url) {
        }
    }
    
class DownloadPhoto extends AsyncTask<String, String, String> {
	
	String photo_id = null,photo = null;
	int progress;
	
	DownloadPhoto(String pId, int p)
	{
		photo_id = pId;
		progress = p;
	}
		
        protected String doInBackground(String... args) {
        	
        	Log.v("DownloadPhoto","doInBackground");
  
            // check for success tag
            try {
            	
                // Building Parameters
                List<NameValuePair> params = new ArrayList<NameValuePair>();
                params.add(new BasicNameValuePair("photo_id", photo_id));
     
                JSONObject json = jsonParser.makeHttpRequest(url_download_photo,"GET", params);
     
                // check log cat for response
                Log.d("Download Image Id", json.toString());
                
                int success = json.getInt(TAG_SUCCESS);
 
                if (success == 1) {       
                	
                	clubs = json.getJSONArray(TAG_CLUBS);

                   	 JSONObject c = clubs.getJSONObject(0);
                 
                        // Storing each json item in variable
                        photo = c.getString(TAG_PHOTO);
                        
                        if(photo!=null)
            			{
            				Log.v("Photo id "+photo_id,""+photo);
                			SaveImageToSDCard(photo,photo_id);
							
                			
                			progressBar.setProgress(progress+1);
            			}
                }
                else 
                {
                	
                }
            
            } catch (JSONException e) {
            	problem();
                e.printStackTrace();             
            }
            catch(Exception e)
            {
            	problem();
            	Log.v("Exception",""+e);           	
            }
       
            return null;
        }
 
        protected void onPostExecute(String file_url) {
			//a.notify();
        }
    }

	void problem()
	{
		getActivity().runOnUiThread(new Runnable() {
		    public void run() {
		    	 Toast.makeText(getActivity(),
                        "Something went wrong! Try again!",Toast.LENGTH_LONG).show();
		    	progressBar.setVisibility(View.INVISIBLE);
				progressText.setVisibility(View.INVISIBLE);
			    }
			});
	}
	
	void SaveImageToSDCard(String Image, String photo_id)
	{	
		 byte[] imageBytes=Base64.decode(Image, Base64.DEFAULT);
         InputStream is = new ByteArrayInputStream(imageBytes);
         Bitmap image=BitmapFactory.decodeStream(is);
         
         String mBaseFolderPath = Environment.getExternalStorageDirectory().getAbsolutePath() + 
                                   "/Clubs/"+ClubActivity.club_id;
         
         if (!new File(mBaseFolderPath).exists()) {
        	 
        	Log.v("!new File(mBaseFolderPath).exists()","Folders not exists");
        	 
         	if(new File(mBaseFolderPath).mkdirs())
         		Log.v("new File(mBaseFolderPath).mkdir()","Folders Created");
        	else
        		Log.v("new File(mBaseFolderPath).mkdir()","Folders not Created");
         }
         else
        	 Log.v("!new File(mBaseFolderPath).exists()","Folders exists");
         
         String mFilePath = mBaseFolderPath + "/" + photo_id + ".jpg";

         File file = new File(mFilePath);
         
  		try{   
  			
         if (!file.exists()){
        		
        	 Log.v("!file.exists()","file not exists");
        	 
        	 if(file.createNewFile())
            		Log.v("createNewFile()","FileCreated");
            	else
            		Log.v("createNewFile()","FileNotCreated");
         }         
         else
        	 Log.v("!file.exists()","file exists");
         
         FileOutputStream stream = new FileOutputStream(file);
         
         image.compress(CompressFormat.JPEG, 100, stream);

         is.close();
         image.recycle();
         
         stream.flush();
         stream.close();

         Log.v("Image Saved ",""+file);       	         
		}
		catch(Exception e)
		{
			Log.v("SaveFile",""+e);
			e.printStackTrace();
		}
	}
}