android - ViewFlipper causing null pointer exception -

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i have program uses view flipper getting nullpointerexception follows when activity called. wish cycle through set of images long activity being run.

06-13 18:52:05.358: e/androidruntime(368): caused by: java.lang.nullpointerexception

activity:

import android.app.activity; import android.os.bundle; import android.os.handler; import android.view.view; import android.view.viewgroup.layoutparams; import android.view.animation.animationutils; import android.widget.imageview; import android.widget.viewflipper;   public class mainmenuactivity extends activity{       handler handler;      runnable runnable;      viewflipper imageswitcher;     @override         public void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.menupage);              imageswitcher= (viewflipper) new viewflipper(this).findviewbyid(r.id.sportspersons);             this.viewchanger();          }      public void viewchanger()     {         imageswitcher.setinanimation(this, r.anim.fadein);           imageswitcher.setoutanimation(this, r.anim.fadeout);           imageview = new imageview(this);         i.setbackgrounddrawable(getresources().getdrawable(r.drawable.jowens));         imageview i2 = new imageview(this);         i2.setbackgrounddrawable(getresources ().getdrawable(r.drawable.maradonna));         imageview i3 = new imageview(this);         i2.setbackgrounddrawable(getresources().getdrawable(r.drawable.mjordan));         imageview i4 = new imageview(this);         i2.setbackgrounddrawable(getresources().getdrawable(r.drawable.pele));         imageswitcher.addview(i);         imageswitcher.addview(i2);         imageswitcher.addview(i3);         imageswitcher.addview(i4);          runnable = new runnable() {              @override             public void run() {                 handler.postdelayed(runnable, 3000);                 imageswitcher.shownext();              }         };         handler.postdelayed(runnable, 500);     } }

xml:

<?xml version="1.0" encoding="utf-8"?> <absolutelayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent" >       <imageview         android:id="@+id/imageview2"         android:layout_width="match_parent"         android:layout_height="508dp"         android:layout_x="-4dp"         android:layout_y="-5dp"         android:scaletype="fitxy"         android:src="@drawable/mainmenu01" />          <viewflipper             android:id="@+id/sportspersons"              android:layout_width="86dp"            android:layout_height="91dp"            android:layout_x="38dp"         android:layout_y="373dp" />   </absolutelayout>

you can try way:

runnable = new runnable() {

        @override         public void run() {             handler.postdelayed(runnable, 3000);             imageswitcher.setautostart(true);               imageswitcher.startflipping();         }     };

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