android - Changing setConetentView with setOnClickListener causes program to crash (NullPointerException) -

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so program worked fine until wanted added "mainmenu". want press button on mainmenu , make go "start_board", basicly made new. if don't give enough information please inform me, i'm new programming.

@override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.mainmenu);        button splaybutton = (button) findviewbyid(r.id.splay);      splaybutton.setbackgroundcolor(color.transparent);      splaybutton.setonclicklistener(new view.onclicklistener(){         public void onclick(view v) {             setcontentview(r.layout.start_board);          //code, code , more code          }     });  }

mainmenu xml

<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/mainmenu" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@drawable/mainmenu" >  <button     android:id="@+id/splay"     android:layout_width="195dp"     android:layout_height="64dp"     android:layout_centervertical="true"     android:layout_centerhorizontal="true" />  </relativelayout>

logcat

11-12 11:41:21.272: e/androidruntime(22244): fatal exception: main 11-12 11:41:21.272: e/androidruntime(22244): process: com.gerfort.gerfortrps, pid: 22244 11-12 11:41:21.272: e/androidruntime(22244): java.lang.nullpointerexception 11-12 11:41:21.272: e/androidruntime(22244):    @ com.gerfort.gerfortrps.mainactivity$4.onclick(mainactivity.java:185) 11-12 11:41:21.272: e/androidruntime(22244):    @ android.view.view.performclick(view.java:4637) 11-12 11:41:21.272: e/androidruntime(22244):    @     android.view.view$performclick.run(view.java:19422) 11-12 11:41:21.272: e/androidruntime(22244):    @     android.os.handler.handlecallback(handler.java:733) 11-12 11:41:21.272: e/androidruntime(22244):    @ android.os.handler.dispatchmessage(handler.java:95) 11-12 11:41:21.272: e/androidruntime(22244):    @ android.os.looper.loop(looper.java:136) 11-12 11:41:21.272: e/androidruntime(22244):    @ android.app.activitythread.main(activitythread.java:5586) 11-12 11:41:21.272: e/androidruntime(22244):    @ java.lang.reflect.method.invokenative(native method) 11-12 11:41:21.272: e/androidruntime(22244):    @ java.lang.reflect.method.invoke(method.java:515) 11-12 11:41:21.272: e/androidruntime(22244):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:1268) 11-12 11:41:21.272: e/androidruntime(22244):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:1084) 11-12 11:41:21.272: e/androidruntime(22244):    @ dalvik.system.nativestart.main(native method)

any ideas? in advance!

use fragments. , use transaction change current ui when user press on button


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