android - Need to create a ProgressDialog before json parsing data -

im going create main screen activity before android json parsing activity, content is

main_screen.xml

<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical"     android:gravity="center_horizontal">      <!--  sample dashboard screen 2 buttons -->     <button android:id="@+id/btnviewproducts"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         android:text="view products"         android:layout_margintop="25dip"/> </linearlayout> 

androidjsonparsingactivity.java

public class androidjsonparsingactivity extends listactivity {       // url make request     private static string url = "http://api.androidhive.info/contacts/";      // json node names     private static final string tag_contacts = "contacts";     private static final string tag_id = "id";     private static final string tag_name = "name";     private static final string tag_email = "email";     private static final string tag_address = "address";      // contacts jsonarray     jsonarray contacts = null;         @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);          // hashmap listview         arraylist<hashmap<string, string>> contactlist = new arraylist<hashmap<string, string>>();          // creating json parser instance         jsonparser jparser = new jsonparser();          // getting json string url         jsonobject json = jparser.getjsonfromurl(url);          try {             // getting array of contacts             contacts = json.getjsonarray(tag_contacts);              // looping through contacts             for(int = 0; < contacts.length(); i++){                 jsonobject c = contacts.getjsonobject(i);                  // storing each json item in variable                 string id = c.getstring(tag_id);                 string name = c.getstring(tag_name);                 string email = c.getstring(tag_email);                 string address = c.getstring(tag_address);                  // creating new hashmap                 hashmap<string, string> map = new hashmap<string, string>();                  // adding each child node hashmap key => value                 map.put(tag_id, id);                 map.put(tag_name, name);                 map.put(tag_email, email);                 map.put(tag_address, address);                  // adding hashlist arraylist                 contactlist.add(map);             }         } catch (jsonexception e) {             e.printstacktrace();         }           /**          * updating parsed json data listview          * */         listadapter adapter = new simpleadapter(this, contactlist,                 r.layout.list_item,                 new string[] { tag_name, tag_email, tag_address }, new int[] {                         r.id.name, r.id.email, r.id.address });          setlistadapter(adapter);          // selecting single listview item         listview lv = getlistview();          // launching new screen on selecting single listitem         lv.setonitemclicklistener(new onitemclicklistener() {              @override             public void onitemclick(adapterview<?> parent, view view,                     int position, long id) {                 // getting values selected listitem                 string name = ((textview) view.findviewbyid(r.id.name)).gettext().tostring();                 string email = ((textview) view.findviewbyid(r.id.email)).gettext().tostring();                 string address = ((textview) view.findviewbyid(r.id.address)).gettext().tostring();                  // starting new intent                 intent in = new intent(getapplicationcontext(), singlemenuitemactivity.class);                 in.putextra(tag_name, name);                 in.putextra(tag_email, email);                 in.putextra(tag_address, address);                 startactivity(in);              }         });           } } 

i need create progressdialog before json parser data , close when parsing data has complete

i'm new in android advanced

try this...use asynctask , use below code.

private progressdialog progressdialog; // class variable  private void showprogressdialog(string title, string message) {         progressdialog = new progressdialog(this);          progressdialog.settitle(title); // set title           progressdialog.setmessage(message); // set message          progressdialog.setcancelable(false);          progressdialog.show(); }  

onpreexecute()

 showprogressdialog("please wait...", "connecting server data"); 

onpostexecute()

  if(progressdialog != null && progressdialog.isshowing())   {      progressdialog.dismiss();   }