android - problems with ProgressDialog,RunOnUiThread and ListAdapter -

ok i've written android program has 3 tabs(meals,drinks , dessert) each in own activity fragment.the problem i'm having retrieving list mysql database , displaying list in each tab.i'de ran , executed custom code displays list of items retrieved mysql database in single list,which worked fine.now bringing code program gives me 3 errors
1)

pdialog = new progressdialog(mealsfragment.this); says         progressdialog(android.context,context) in progressdialog cannot applied           com.example.tab.tablayout.mealsfragment 

2) runonuithread(new runnable() says "cannot resolve method runonuithread "

3)is list adapter.

the initial code used oncreate,but fragment uses oncreateview.i dont know if thats issue.

here code mealsfragment.java

package com.example.tabs.tablayout;  import java.util.arraylist; import java.util.hashmap; import java.util.list;  import org.apache.http.namevaluepair; import org.json.jsonarray; import org.json.jsonexception; import org.json.jsonobject;  import android.app.listactivity; import android.app.progressdialog; import android.content.intent; import android.os.asynctask; import android.os.bundle; import android.support.v4.app.listfragment; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; import android.widget.adapterview; import android.widget.adapterview.onitemclicklistener; import android.widget.listadapter; import android.widget.listview; import android.widget.simpleadapter; import android.widget.textview;  /**  * created gigabyte on 5/21/2014.  */ public class mealsfragment extends listfragment {      // progress dialog     private progressdialog pdialog;      // creating json parser object     jsonparser jparser = new jsonparser();      arraylist<hashmap<string, string>> mealslist;      // url products list     private static string url_all_meals = "http://10.180.79.73/dbase_connect/get_all_meals.php";      // json node names     private static final string tag_success = "success";     private static final string tag_meals = "meals";     private static final string tag_mid = "mid";     private static final string tag_name = "name";      // products jsonarray     jsonarray meals = null;      @override     public view oncreateview(layoutinflater inflater, viewgroup container,                              bundle savedinstancestate) {          view rootview = inflater.inflate(r.layout.fragment_meals, container, false);            // hashmap listview         mealslist = new arraylist<hashmap<string, string>>();          // loading meals in background thread         new loadallmeals().execute();           // listview         listview lv = getlistview();          return rootview;     }       /**          * background async task load product making http request          * */        class loadallmeals extends asynctask<string, string, string> {              /**              * before starting background thread show progress dialog              * */              protected void onpreexecute() {                 super.onpreexecute();                 pdialog = new progressdialog(mealsfragment.this);                 pdialog.setmessage("loading meals. please wait...");                 pdialog.setindeterminate(false);                 pdialog.setcancelable(false);                 pdialog.show();             }              /**              * getting meals url              * */             protected string doinbackground(string... args) {                 // building parameters                 list<namevaluepair> params = new arraylist<namevaluepair>();                 // getting json string url                 jsonobject json = jparser.makehttprequest(url_all_meals, "get", params);                  // check log cat json response                 log.d("all meals: ", json.tostring());                  try {                     // checking success tag                     int success = json.getint(tag_success);                      if (success == 1) {                         // meals found                         // getting array of meals                         meals = json.getjsonarray(tag_meals);                          // looping through meals                         (int = 0; < meals.length(); i++) {                             jsonobject c = meals.getjsonobject(i);                              // storing each json item in variable                             string id = c.getstring(tag_mid);                             string name = c.getstring(tag_name);                              // creating new hashmap                             hashmap<string, string> map = new hashmap<string, string>();                              // adding each child node hashmap key => value                             map.put(tag_mid, id);                             map.put(tag_name, name);                              // adding hashlist arraylist                             mealslist.add(map);                         }                     } /*else {                         // no products found                         // launch add new product activity                         intent = new intent(getapplicationcontext(),                                 newproductactivity.class);                         // closing previous activities                         i.addflags(intent.flag_activity_clear_top);                         startactivity(i);                     }                     */                 } catch (jsonexception e) {                     e.printstacktrace();                 }                  return null;             }              /**              * after completing background task dismiss progress dialog              * **/             protected void onpostexecute(string file_url) {                 // dismiss dialog after getting meals                 pdialog.dismiss();                 // updating ui background thread                 runonuithread(new runnable() {                     public void run() {                         /**                          * updating parsed json data listview                          * */                         listadapter adapter = new simpleadapter(                                 mealsfragment.this, mealslist,                                 r.layout.meals_list_item, new string[] {tag_mid,                                 tag_name},                                 new int[] { r.id.mid, r.id.name });                         // updating listview                         setlistadapter(adapter);                       }                 });              }   } } 

1) first parameter of progressdialog constructor must context. use

new progressdialog(getactivity()); 

2) use getactivity().runonuithread(...). however, that's not necessary in context. asynctask.onpostexecute() method running in ui thread. move runnable code body of onpostexecute() method.

3) same 1, first parameter must context. use new simpleadapter(getactivity(), ...).