java - Custom ActionBar NullPointerException -

sorry english. have tabactivity , want create custom action bar, have error:

04-25 20:11:17.777: e/androidruntime(8083): java.lang.runtimeexception: unable start activity componentinfo{com.example.bonsitelazyl/com.example.bonsitelazyl.mainactivity}: java.lang.runtimeexception: unable start activity componentinfo{com.example.bonsitelazyl/com.example.bonsitelazyl.news}: java.lang.nullpointerexception

mainactivity:

public class mainactivity extends tabactivity {      tabhost tabhost;     progressdialog pdialog;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          tabhost = gettabhost();           settabs();     }       private void settabs()      {          addtab("", r.drawable.tab_news, news.class);          addtab("", r.drawable.tab_servises, news.class);         addtab("", r.drawable.tab_profile, news.class);         addtab("", r.drawable.tab_contacts, news.class);     }      private void addtab(string labelid, int drawableid, class<?> c)     {          intent intent = new intent(this, c);         tabhost.tabspec spec = tabhost.newtabspec("tab" + labelid);           view tabindicator = layoutinflater.from(this).inflate(r.layout.tab_indicator, gettabwidget(), false);         textview title = (textview) tabindicator.findviewbyid(r.id.title);         title.settext(labelid);         imageview icon = (imageview) tabindicator.findviewbyid(r.id.icon);          icon.setimageresource(drawableid);               spec.setindicator(tabindicator);         spec.setcontent(intent);         tabhost.addtab(spec);     } } 

news

public class news extends activity {     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main_n);          actionbar mactionbar = getactionbar();         mactionbar.setdisplayshowhomeenabled(false);         mactionbar.setdisplayshowtitleenabled(false);         layoutinflater minflater = layoutinflater.from(this);          view mcustomview = minflater.inflate(r.layout.custom_actionbar, null);          mactionbar.setcustomview(mcustomview);         mactionbar.setdisplayshowcustomenabled(true);     } } 

upd

all log cat

04-25 20:33:15.186: e/androidruntime(12242): fatal exception: main 04-25 20:33:15.186: e/androidruntime(12242): java.lang.runtimeexception: unable start activity componentinfo{com.example.bonsitelazyl/com.example.bonsitelazyl.mainactivity}: java.lang.runtimeexception: unable start activity componentinfo{com.example.bonsitelazyl/com.example.bonsitelazyl.news}: java.lang.nullpointerexception 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.performlaunchactivity(activitythread.java:2077) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.handlelaunchactivity(activitythread.java:2104) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.access$600(activitythread.java:134) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread$h.handlemessage(activitythread.java:1247) 04-25 20:33:15.186: e/androidruntime(12242): @ android.os.handler.dispatchmessage(handler.java:99) 04-25 20:33:15.186: e/androidruntime(12242): @ android.os.looper.loop(looper.java:154) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.main(activitythread.java:4624) 04-25 20:33:15.186: e/androidruntime(12242): @ java.lang.reflect.method.invokenative(native method) 04-25 20:33:15.186: e/androidruntime(12242): @ java.lang.reflect.method.invoke(method.java:511) 04-25 20:33:15.186: e/androidruntime(12242): @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:809) 04-25 20:33:15.186: e/androidruntime(12242): @ com.android.internal.os.zygoteinit.main(zygoteinit.java:576) 04-25 20:33:15.186: e/androidruntime(12242): @ dalvik.system.nativestart.main(native method) 04-25 20:33:15.186: e/androidruntime(12242): caused by: java.lang.runtimeexception: unable start activity componentinfo{com.example.bonsitelazyl/com.example.bonsitelazyl.news}: java.lang.nullpointerexception 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.performlaunchactivity(activitythread.java:2077) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.startactivitynow(activitythread.java:1917) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.localactivitymanager.movetostate(localactivitymanager.java:135) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.localactivitymanager.startactivity(localactivitymanager.java:347) 04-25 20:33:15.186: e/androidruntime(12242): @ android.widget.tabhost$intentcontentstrategy.getcontentview(tabhost.java:682) 04-25 20:33:15.186: e/androidruntime(12242): @ android.widget.tabhost.setcurrenttab(tabhost.java:346) 04-25 20:33:15.186: e/androidruntime(12242): @ android.widget.tabhost.addtab(tabhost.java:236) 04-25 20:33:15.186: e/androidruntime(12242): @ com.example.bonsitelazyl.mainactivity.addtab(mainactivity.java:47) 04-25 20:33:15.186: e/androidruntime(12242): @ com.example.bonsitelazyl.mainactivity.settabs(mainactivity.java:29) 04-25 20:33:15.186: e/androidruntime(12242): @ com.example.bonsitelazyl.mainactivity.oncreate(mainactivity.java:24) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activity.performcreate(activity.java:4479) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1050) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.performlaunchactivity(activitythread.java:2041) 04-25 20:33:15.186: e/androidruntime(12242): ... 11 more 04-25 20:33:15.186: e/androidruntime(12242): caused by: java.lang.nullpointerexception 04-25 20:33:15.186: e/androidruntime(12242): @ com.example.bonsitelazyl.news.oncreate(news.java:15) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activity.performcreate(activity.java:4479) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1050) 04-25 20:33:15.186: e/androidruntime(12242): @ android.app.activitythread.performlaunchactivity(activitythread.java:2041)

upd:

getactionbar return null

upd:

i try android.support.v7.app.actionbaractivity in new update, add code:

getsupportactionbar().setdisplayshowcustomenabled(true);          view customnav = layoutinflater.from(this).inflate(r.layout.custom_actionbar, null);         getsupportactionbar().setcustomview(customnav);         getsupportactionbar().setdisplayshowtitleenabled(false);         getsupportactionbar().setcustomview(customnav); 

04-25 21:09:09.550: e/androidruntime(22075): java.lang.runtimeexception: unable start activity componentinfo{com.example.bonsitelazyl/com.example.bonsitelazyl.mainactivity}: java.lang.runtimeexception: unable start activity componentinfo{com.example.bonsitelazyl/com.example.bonsitelazyl.news}: java.lang.nullpointerexception

the tabactivity deprecated class. add tabs class use code above.

mainactivity2activity.java

import java.util.locale; import android.support.v7.app.actionbaractivity; import android.support.v4.app.fragment; import android.support.v4.app.fragmentmanager; import android.support.v4.app.fragmentpageradapter; import android.os.bundle; import android.support.v4.view.viewpager; import android.view.layoutinflater; import android.view.menu; import android.view.menuitem; import android.view.view; import android.view.viewgroup; public class mainactivity2activity extends actionbaractivity {      sectionspageradapter msectionspageradapter;     viewpager mviewpager;      @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main_activity2);         msectionspageradapter = new sectionspageradapter(getsupportfragmentmanager());         mviewpager = (viewpager) findviewbyid(r.id.pager);         mviewpager.setadapter(msectionspageradapter);     }      @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.menu_main_activity2, menu);         return true;     }      @override     public boolean onoptionsitemselected(menuitem item) {         int id = item.getitemid();         if (id == r.id.action_settings) {             return true;         }         return super.onoptionsitemselected(item);     }      public class sectionspageradapter extends fragmentpageradapter {          public sectionspageradapter(fragmentmanager fm) {             super(fm);         }          @override         public fragment getitem(int position) {             return placeholderfragment.newinstance(position + 1);         }          @override         public int getcount() {             return 3;         }          @override         public charsequence getpagetitle(int position) {             locale l = locale.getdefault();             switch (position) {                 case 0:                     return getstring(r.string.title_section1).touppercase(l);                 case 1:                     return getstring(r.string.title_section2).touppercase(l);                 case 2:                     return getstring(r.string.title_section3).touppercase(l);             }             return null;         }     }      public static class placeholderfragment extends fragment {         private static final string arg_section_number = "section_number";         public static placeholderfragment newinstance(int sectionnumber) {             placeholderfragment fragment = new placeholderfragment();             bundle args = new bundle();             args.putint(arg_section_number, sectionnumber);             fragment.setarguments(args);             return fragment;         }          public placeholderfragment() {         }          @override         public view oncreateview(layoutinflater inflater, viewgroup container,                          bundle savedinstancestate) {             view rootview = inflater.inflate(r.layout.fragment_main_activity2, container, false);             return rootview;         }     }  } 

layout/activity_main_activity2.xml

<android.support.v4.view.viewpager xmlns:android="http://schemas.android.com/apk/res/android"                                    xmlns:tools="http://schemas.android.com/tools"                                    android:id="@+id/pager"                                    android:layout_width="match_parent"                                    android:layout_height="match_parent"                                    tools:context="georgeoikonomou.fishinggps.mainactivity2activity"/> 

layout/fragment_main_activity2.xml

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"                 xmlns:tools="http://schemas.android.com/tools"                 android:layout_width="match_parent"                 android:layout_height="match_parent"                 android:paddingleft="@dimen/activity_horizontal_margin"                 android:paddingright="@dimen/activity_horizontal_margin"                 android:paddingtop="@dimen/activity_vertical_margin"                 android:paddingbottom="@dimen/activity_vertical_margin"                 tools:context="georgeoikonomou.fishinggps.mainactivity2activity$placeholderfragment">      <textview         android:id="@+id/section_label"         android:layout_width="wrap_content"         android:layout_height="wrap_content"/>  </relativelayout>