String idname[]=new String[2];
		  		   idname[0]=id;
		  		   idname[1]=name;
		  		   Subcategories subcats=new Subcategories();
		  		   subcats.execute(idname);


this call excute//////


below is asynctask class

class Subcategories extends AsyncTask<String[], Void, String> {
		      private final ProgressDialog dialog = new ProgressDialog(forparse.this);
		      String temps[]=new String[2];
		      // can use UI thread here
		      protected void onPreExecute() {
		         this.dialog.setMessage("Selecting data...");
		         this.dialog.show();
		      }

		      @Override
				protected String doInBackground(String[]... params) {
					// TODO Auto-generated method stub
		    	  temps=params[0];
		    	  n=doc.getElementsByTagName("Category");
		  		   int c=0;
		  		   for(int i=0;i<n.getLength();i++){
		  			   Node fstnode=n.item(i);
		  			   e=(Element)n.item(i);
		 	           if(e.getParentNode().getNodeName().equalsIgnoreCase("Categories")){
		  			   if(CategoryId.get(c).equalsIgnoreCase(temps[0])){
		  					 // for mainproducts
		  					 nmainpro=e.getElementsByTagName("Products");
		  	    		     for(int p=0;p<nmainpro.getLength();p++){
		  		      		       Element emainproducts=(Element)nmainpro.item(p);
		  		      		       Node npropar=emainproducts.getParentNode().getParentNode();
		  		      		       if(npropar.getNodeName().equalsIgnoreCase("Categories")){
		  		      		       NodeList nmainproduct=emainproducts.getElementsByTagName("Product");
		  		      		       for(int m=0;m<nmainproduct.getLength();m++){
		  		      		    	   Element emainproduct=(Element)nmainproduct.item(m);
		  		      		    	   ID.add(Parser.getValue(emainproduct, "ID"));
		  		      		    	   Name.add(Parser.getValue(emainproduct, "Name"));
		  		      		        }
		  		      		      }
		  		      		    }

		  	    		     //for subcategories
		  	    		     nmainpro=e.getElementsByTagName("SubCategories");
		  	    		     for(int p=0;p<nmainpro.getLength();p++){
		  	    		    	   Element emainproducts=(Element)nmainpro.item(p);
		  		      		       NodeList nmainproduct=emainproducts.getElementsByTagName("Category");
		  		      		       for(int m=0;m<nmainproduct.getLength();m++){
		  		      		    	   Element emainproduct=(Element)nmainproduct.item(m);
		  		      		    	   if(emainproduct.getParentNode().getParentNode().getParentNode().getNodeName().equalsIgnoreCase("Categories")){
		  		      		    	   ID.add(Parser.getValue(emainproduct, "ID"));
		  		      		    	   Name.add(Parser.getValue(emainproduct, "Name"));
		  		      		    	   }
		  		      		        }
		  		      		     }
		  	    		     break;
		  		      	   }
		  			   c++;
		 	          }
		  		    }

					return null;
				}

		      // can use UI thread here
		      protected void onPostExecute(final String result) {
		    	  if (dialog != null && dialog.isShowing()) {
		    	       dialog.dismiss();
		    	  }
		        /* if (this.dialog.isShowing()) {
		            this.dialog.dismiss();
		         }*/
		         in=new Intent(forparse.this,SubCategories.class);
		  		 in.putExtra("parent",temps[1]);
				 in.putStringArrayListExtra("name",(ArrayList<String>) Name);
				 in.putStringArrayListExtra("id",(ArrayList<String>) ID);
				 startActivityForResult(in,0);

		      }
		   }