java - Switching Activitys -

i trying switch activity's use of button.

skillz.java

button b2 =(button)findviewbyid(r.id.button2); b2.setonclicklistener(new onclicklistener() {     public void onclick(view v) {         intent myintent = new intent();         string packagename="marco.skillz.app";         string classname="marco.skillz.app.act2";         myintent.setclassname(packagename, classname);         startactivity(myintent);     } }); 

act2.java

@override public void oncreate(bundle savedinstancestate){     super.oncreate(savedinstancestate);     setcontentview(r.layout.page2); } 

when app run in emulator following error:

the application "app name" (process marco.skillz.app) has stopped unexpectedly. 

fixed!! feel stupid had android:name=".act1" when should android:name=".act2".

thanks input :p

please check this

   public void onclick(view v) {         intent myintent = new intent(skillz.this,act2.class);         startactivity(myintent);      } 

add act2 activity in manifest file