java - How do I use button to switch pages in android studio? -

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i trying use btn2 switch page mainactivity calcpage.class.

cant seem figure out doing wrong.

i have error lines underneath btn2, onclicklistener, override, , view v

here mainactivity.java

package edu.khershockolivetcollege.ballistic_calculator;  import android.app.activity; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext; import android.widget.textview; import android.content.intent; import java.text.decimalformat;  public class mainactivity extends activity { @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.content_main);      button btn1 = (button)findviewbyid(r.id.calculate);     button btn2 = (button)findviewbyid(r.id.calculate);     final edittext et1 = (edittext)findviewbyid(r.id.muzzletext);     final edittext et2 = (edittext)findviewbyid(r.id.rangetext);     final textview time = (textview)findviewbyid(r.id.timeanswer);     final textview bulletdrop = (textview)findviewbyid(r.id.dropanswer);     btn1.setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             decimalformat f = new decimalformat("##.00");             double x = new integer(et1.gettext().tostring());             double y = new integer(et2.gettext().tostring());             double timetotarget = y / x;             double grav = 9.81;             double timesquared = timetotarget * timetotarget;             double drop = grav * timesquared;             time.settext("  " + f.format(timetotarget) + " seconds");             bulletdrop.settext("  " + f.format(drop) + " meters");         }          btn2.setonclicklistener(new onclicklistener() {              @override             public void onclick(view v) {                 intent i=new intent(context, calcpage.class);                 startactivity(i);             }       }); }

}

it seems setting btn2 onclicklistener inside btn1 onclicklistener. if outside , close curly brackets should work.

like this:

@override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.content_main);      button btn1 = (button)findviewbyid(r.id.calculate);     button btn2 = (button)findviewbyid(r.id.calculate);     final edittext et1 = (edittext)findviewbyid(r.id.muzzletext);     final edittext et2 = (edittext)findviewbyid(r.id.rangetext);     final textview time = (textview)findviewbyid(r.id.timeanswer);     final textview bulletdrop = (textview)findviewbyid(r.id.dropanswer);     btn1.setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             decimalformat f = new decimalformat("##.00");             double x = new integer(et1.gettext().tostring());             double y = new integer(et2.gettext().tostring());             double timetotarget = y / x;             double grav = 9.81;             double timesquared = timetotarget * timetotarget;             double drop = grav * timesquared;             time.settext("  " + f.format(timetotarget) + " seconds");             bulletdrop.settext("  " + f.format(drop) + " meters");         }     });      btn2.setonclicklistener(new onclicklistener() {          @override         public void onclick (view v){             intent = new intent(context, calcpage.class);             startactivity(i);         }     }); }

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