How to implement navigation drawer in all activities in android -

i have piece of code supposed show navigation drawer in activities. code not show errors while running unfortunately stopped error after checking logcat shows java null pointer exception.

these has been declared

   private drawerlayout mdrawerlayout;     private listview mdrawerlist;     private actionbardrawertoggle mdrawertoggle;     protected relativelayout _completelayout, _activitylayout;      private charsequence mdrawertitle;       private charsequence mtitle;      private arraylist<navdraweritem> navdraweritems;     private navidrawerlistadapter adapter; 

after oncreate

    public void set(string[] navmenutitles, typedarray navmenuicons)     {         mtitle = mdrawertitle = gettitle();          mdrawerlayout = (drawerlayout) findviewbyid(r.id.drawer_layout);         mdrawerlist = (listview) findviewbyid(r.id.left_drawer);          navdraweritems = new arraylist<navdraweritem>();          // adding nav drawer items         if (navmenuicons == null) {             (int = 0; < navmenutitles.length; i++) {                 navdraweritems.add(new navdraweritem(navmenutitles[i]));             }         } else {             (int = 0; < navmenutitles.length; i++) {                 navdraweritems.add(new navdraweritem(navmenutitles[i],                         navmenuicons.getresourceid(i, -1)));             }         }          mdrawerlist.setonitemclicklistener(new slidemenuclicklistener());          // setting nav drawer list adapter         adapter = new navidrawerlistadapter(getapplicationcontext(),                 navdraweritems);         mdrawerlist.setadapter(adapter);          // enabling action bar app icon , behaving toggle button         getsupportactionbar().setdisplayhomeasupenabled(true);         getsupportactionbar().sethomebuttonenabled(true);         // getsupportactionbar().seticon(r.drawable.ic_drawer);          mdrawertoggle = new actionbardrawertoggle(this, mdrawerlayout,                 r.drawable.ic_launcher, // nav menu toggle icon                 r.string.app_name, // nav drawer open - description                 // accessibility                 r.string.app_name // nav drawer close - description                 // accessibility         ) {             public void ondrawerclosed(view view) {                 getsupportactionbar().settitle(mtitle);                 // calling onprepareoptionsmenu() show action bar icons                 supportinvalidateoptionsmenu();             }              public void ondraweropened(view drawerview) {                 getsupportactionbar().settitle(mdrawertitle);                 // calling onprepareoptionsmenu() hide action bar icons                 supportinvalidateoptionsmenu();             }         };         mdrawerlayout.setdrawerlistener(mdrawertoggle);      }     private class slidemenuclicklistener implements             listview.onitemclicklistener {         @override         public void onitemclick(adapterview<?> parent, view view, int position,                                 long id) {             // display view selected nav drawer item             displayview(position);         }     }     @override     public boolean onprepareoptionsmenu(menu menu) {         // if nav drawer opened, hide action items         // boolean draweropen = mdrawerlayout.isdraweropen(mdrawerlist);         // menu.finditem(r.id.action_settings).setvisible(!draweropen);         return super.onprepareoptionsmenu(menu);     }     @override     public void settitle(charsequence title) {         mtitle = title;         getactionbar().settitle(mtitle);     }      /**      * when using actionbardrawertoggle, must call during      * onpostcreate() , onconfigurationchanged()...      */      @override     protected void onpostcreate(bundle savedinstancestate) {         super.onpostcreate(savedinstancestate);         // sync toggle state after onrestoreinstancestate has occurred.            mdrawertoggle.syncstate();     } 

the null pointer exception points @ mdrawertoogle.syncstate(); in onpostcreate

you don't need have different navigation drawers different activities. have single activity navigationdrawer , make others fragments. have this.