I Need To Retrieve Supplier Name, Primary, Secondary Category And Source And List It In A Listview. On Running The App I Get Empty List

public void onSuccess(String response)
		{
			try
			{
				Toast.makeText(getApplicationContext(), response, Toast.LENGTH_SHORT).show();
				JSONObject obj=new JSONObject(response);					
				if(obj!=null){
					JSONArray data=obj.getJSONArray("RetrieveSupplierRegistrationDetailsResult");
					for(int i=0;i<data.length();i++)
					{
						  JSONObject user = data.getJSONObject(i);
						 
						if(user.getString("iSupplierID")!="0")							
						{								
								String SUPPLIER_NAME=user.getString(TAG_NAME);	
								String PRIMARY_SERVICE_CATEGORY = user.getString(TAG_PRIMARY);
					            String SECONDARY_SERVICE_CATEGORY = user.getString(TAG_SECONDARY);
					            String SOURCE_DIRECTORY_TYPE = user.getString(TAG_SOURCE);
					            HashMap<String, String> map = new HashMap<String, String>();
					            map.put(TAG_NAME, SUPPLIER_NAME);
					            map.put(TAG_PRIMARY, PRIMARY_SERVICE_CATEGORY);
					            map.put(TAG_SECONDARY, SECONDARY_SERVICE_CATEGORY);
					            map.put(TAG_SOURCE, SOURCE_DIRECTORY_TYPE);
					            supplierlist.add(map);
					            lv=(ListView)findViewById(R.id.listView1);
					            ListAdapter adapter = new SimpleAdapter(SupplierDetails.this, supplierlist,
					                    R.layout.list_view,
					                    new String[] { TAG_NAME,TAG_PRIMARY,TAG_SECONDARY, TAG_SOURCE }, new int[] {
					                        R.id.primary,R.id.secondary, R.id.source});
					                lv.setAdapter(adapter);
					                lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {

										@Override
										public void onItemClick(
												AdapterView<?> parent, View view,
												int position, long id) {
											// TODO Auto-generated method stub
										
											Toast.makeText(getApplicationContext(), "You Clicked at "+supplierlist.get(+position).get("SUPPLIER_NAME"), Toast.LENGTH_SHORT).show();
										}
					                	
					                });
							
						}
						else
						{
							Toast.makeText(getApplicationContext(), "Check", Toast.LENGTH_SHORT).show();
						}
						
					}
				}
			}catch(JSONException e){
				Toast.makeText(getApplicationContext(), "Error Occured [Server's JSON response might be invalid]!", Toast.LENGTH_LONG).show();
		        e.printStackTrace();
			}
		}