android How to refresh my main activity after updating database? -

i have 3 activities,the first 1 used hold values database,and list view showed on second one,when click item in list view i'll jumping third activity , able edit item selected,after updating data in database,new datas shown in second activity,but when return first one,nothing refreshed.how can updated data in first activity too? appreciated.

the second activity code:

    import android.content.contentvalues;     import android.content.context;     import android.content.intent;     import android.database.cursor;     import android.database.sqlite.sqlitedatabase;     import android.os.bundle;     import android.support.v7.app.appcompatactivity;     import android.util.log;     import android.view.menu;     import android.view.menuinflater;     import android.view.menuitem;     import android.view.view;     import android.widget.adapterview;     import android.widget.listadapter;     import android.widget.listview;     import android.widget.toast;      public class setupactivity extends appcompatactivity {          private context context;         static string = "values";         listview mlistview;          final string[] setitems = {"name","birthday","type","sex"};          @override         public void oncreate(bundle savedinstance){             super.oncreate(savedinstance);             setcontentview(r.layout.setuplist);             mlistview = (listview)findviewbyid(r.id.listview);              context = this;             updateview();          }          private void updateview(){             dogdatabasehelper dbhelper= new dogdatabasehelper(getapplicationcontext());             sqlitedatabase db = dbhelper.getwritabledatabase();             cursor cursor = db.query("dog",null,null,null,null,null,null,null);             if(cursor.movetofirst()){                 string name = cursor.getstring(cursor.getcolumnindex("name"));                 string birthday = cursor.getstring(cursor.getcolumnindex("birthday"));                 string size = cursor.getstring(cursor.getcolumnindex("size"));                 string sex = cursor.getstring(cursor.getcolumnindex("sex"));                  final string[] setvalues = {name,birthday,size,sex};                 listadapter listadapter = new customadapter(this,setitems,setvalues);                 mlistview.setadapter(listadapter);                  mlistview.setonitemclicklistener(new adapterview.onitemclicklistener() {                     @override                     public void onitemclick(adapterview<?> adapterview, view view, int position, long id) {                         string setupitemvalue = setvalues[position];                         string setupitem = setitems[position];                         intent intent;                         if(setupitem.equals("name")){                             intent = new intent(setupactivity.this,changename.class);                             intent.putextra(extra,setupitemvalue);                             startactivityforresult(intent,1);                         } else if(setupitem.equals("birthday")){                             intent = new intent(setupactivity.this,changebirthday.class);                             intent.putextra(extra,setupitemvalue);                             startactivityforresult(intent,2);                         }else if(setupitem.equals("type")){                             intent = new intent(setupactivity.this,changetype.class);                             intent.putextra(extra,setupitemvalue);                             startactivityforresult(intent,3);                         }else{                             intent = new intent(setupactivity.this,changesex.class);                             intent.putextra(extra,setupitemvalue);                             startactivityforresult(intent,4);                         }                      }                 });             }             cursor.close();         }          @override         protected void onactivityresult(int requestcode,int resultcode,intent data){              dogdatabasehelper dbhelper= new dogdatabasehelper(getapplicationcontext());             sqlitedatabase db = dbhelper.getwritabledatabase();             cursor cursor = db.query("dog",null,null,null,null,null,null,null);             switch (requestcode){                 case 1:                     if (resultcode == result_ok){                          contentvalues cv = new contentvalues();                         cv.put("name",data.getstringextra("return_name"));                         db.update("dog",cv,"id=?",new string[]{"1"});                      }                     break;                 case 2:                     toast.maketext(this, "update2", toast.length_short).show();                     if(resultcode == result_ok){                         contentvalues cv = new contentvalues();                         cv.put("birthday",data.getstringextra("return_birthday"));                         db.update("dog",cv,"id=?",new string[]{"1"});                      }                     break;                 case 3:                     toast.maketext(this, "update3", toast.length_short).show();                     if(resultcode == result_ok){                         contentvalues cv = new contentvalues();                         cv.put("size",data.getstringextra("return_type"));                         db.update("dog",cv,"id=?",new string[]{"1"});                     }                     break;                 case 4:                      if(resultcode == result_ok){                         contentvalues cv = new contentvalues();                         cv.put("sex",data.getstringextra("return_sex"));                         toast.maketext(this, data.getstringextra("return_sex"), toast.length_short).show();                         int r = db.update("dog",cv,"id=?",new string[]{"1"});                         if(r != 1){                             toast.maketext(this, "update3", toast.length_short).show();                         }                     }                     break;              }             db.close();             updateview();         }          @override         public boolean oncreateoptionsmenu(menu menu){             menuinflater inflater = getmenuinflater();             inflater.inflate(r.menu.add,menu);             return true;         }         @override         public boolean onoptionsitem      selected(menuitem item){             int id = item.getitemid();             if(id == r.id.add){              }             return super.onoptionsitemselected(item);         }     } 

you should open second activity startactivityforresult(intent,requestcode) , can implement onactivityresult(...) in first 1 can fetch data db once more , refresh views.