sdk - android process crash on adb with simple app, not sure what i'm doing wrong -

package com.russell.saw;  import android.app.activity; import android.os.bundle; import android.view.view; import android.widget.button;  public class learnandroid extends activity {     /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);     button landroid_button = (button) findviewbyid(r.id.landroid_button); {         landroid_button.setonclicklistener(                new view.onclicklistener() {                  public void onclick(view v) {                     // todo auto-generated method stub                     setcontentview(r.layout.button);                  }             });     }    button back_button = (button) findviewbyid(r.id.back_button); {         back_button.setonclicklistener(                new view.onclicklistener() {                  public void onclick(view v) {                     // todo auto-generated method stub                     setcontentview(r.layout.main);                  }             });     }     } } 

i'm unsure of going wrong, it's simple learning tester app, 2 buttons, going 1 page another, crash run on phone.

woah! have onclicklisteners set wrong. calling setcontentview in onclicklisteners. instead, need use intent go 1 activity next. needs this:

mybutton.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             intent intent = new intent(main.this, myotheractivity.class);             startactivity(intent);          }     }); 

also, don't use landroid_button reference button: that's xml id of resource. instead need grab hold of button doing this:

   button mylandroidbutton = (button)findviewbyid(r.id.landroid_button)  

then when set onclicklistener, use variable: mylandroidbutton mylandroidbutton.setonclicklistener , on..