java - Fragment View Return Null -

my view has been returning null though have set view global variable , calling findviewbyid on oncreateview().

this codes view part

public class mainmenu extends fragment { textview txt = null; view view1; view mview;   public view oncreateview(layoutinflater inflater,viewgroup container, bundle savedinstancestate) {    // view1 = inflater.inflate(r.layout.fragment_main_menu, container, false);     mview = layoutinflater.from(getactivity()).inflate(r.layout.fragment_main_menu, null,false);     pref = getactivity().getpreferences(0);     twitter = new twitterfactory().getinstance();     twitter.setoauthconsumer(pref.getstring("consumer_key", ""), pref.getstring("consumer_secret", ""));     txt = (textview)mview.findviewbyid(r.id.tww1);       //run retrieve tweets method     new tweetstream().execute();      new thread(new mainmenu().new consumer()).start();      return mview; } 

in fragment_main_menu.xml

  <linearlayout             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:orientation="vertical">              <textview                 android:layout_width="fill_parent"                 android:layout_height="wrap_content"                 android:id="@+id/tww1"                 android:gravity="center"                 android:textsize="100dp"                 android:text="off"/>          </linearlayout> 

and codes invoke it:

public void turnon(){ txt.settext("on"); } 

the method runs turnon function:

 class consumer implements runnable {      @override     public void run() {         try {              while (queue.size() != 0) {                 string msg = getobj.getmsg();                 string[] result = msg.split("\\s");                 string msg2 = result[0];                 if(msg2.equals("on")){                     txt.settext("on");                     //turnon();                 }                 else if(msg.equals("off")){                     txt.settext("off");                    // turnoff();                 }              }             if (queue.size() == 0) {                 thread.sleep(1000);                 run();             }           } catch (interruptedexception e) {             e.printstacktrace();         }     } } 

and error get:

06-19 12:47:43.921    5213-9586/? e/androidruntime﹕ fatal exception: thread-128222 process: com.example.john.fabric, pid: 5213 java.lang.nullpointerexception: attempt invoke virtual method 'void android.widget.textview.settext(java.lang.charsequence)' on null object reference 

any ideas? thank you!

edit1: using false inflater inflate method. not see why should null pointer.

edit2: running turnon or settext method inside both return me null.

use runonui thread update values ui part try below code

@override     public void run() {         try {              while (queue.size() != 0) {                 string msg = getobj.getmsg();                 string[] result = msg.split("\\s");                 string msg2 = result[0];            runonuithread(new runnable() {                  @override                 public void run() {                 if(msg2.equals("on")){                     txt.settext("on");                     //turnon();                 }                 else if(msg.equals("off")){                     txt.settext("off");                    // turnoff();                 }               }              }             }             if (queue.size() == 0) {                 thread.sleep(1000);                 run();             }           } catch (interruptedexception e) {             e.printstacktrace();         }