android intent - Cannot go to the next activity -

i creating application input height , weight, compute bmi click next button go class , display bmi result on fragment within class.i want know why stops after clicking button. here code:

package com.example.hcon;  import android.app.activity; import android.content.intent; import android.os.bundle; import android.view.menu; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.textview; import android.widget.toast;   public class firstactivity extends activity {      button button1;      edittext et_name;      edittext et_height;      edittext et_weight;      double ht = 0;      double wt = 0;      textview bmiout;       @override     protected void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_first);          et_name = (edittext) findviewbyid(r.id.et_name);         button1 = (button) findviewbyid(r.id.button1);           button1.setonclicklistener(new onclicklistener() {              public void onclick(view v) {                  et_height = (edittext) findviewbyid(r.id.et_height);                 et_weight = (edittext) findviewbyid(r.id.et_weight);                  ht = double.parsedouble(et_height.gettext().tostring());                 wt = double.parsedouble(et_weight.gettext().tostring());                   double bmi = wt / (ht * ht);                   intent = new intent(firstactivity.this, secactivity.class);                 a.putextra(out, out);                 toast.maketext(firstactivity.this, "welcome " + et_name.gettext().tostring(), toast.length_long).show();                 startactivity(new intent(firstactivity.this, secactivity.class));              }         });     }       @override     public boolean oncreateoptionsmenu(menu menu) {         // inflate menu; adds items action bar if present.         getmenuinflater().inflate(r.menu.first, menu);         return true;     }  }   

secactivity.class activity containing fragment output should displayed.

use getapplicationcontext , pass context in intent. , pass a in startactivity

intent = new intent(getapplicationcontext(), secactivity.class); a.putextra(out, out); //your toast startactivity(a));