java - Why wont my calculations show in my app? -

i trying make simple ballistic app calculates bullet drop , time target. have in place need it, when test , wait results doesn't seems calculations have in there. suggestions me?

package com.example.koryhershock.testapp;  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;  public class mainactivity extends activity { @override public void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.content_main);      button btn = (button)findviewbyid(r.id.button1);     final edittext et1 = (edittext)findviewbyid(r.id.muzzlevelocity);     final edittext et2 = (edittext)findviewbyid(r.id.targetrange);     final textview time = (textview)findviewbyid(r.id.textview1);     final textview bulletdrop = (textview)findviewbyid(r.id.textview2);     btn.setonclicklistener(new onclicklistener() {          @override         public void onclick(view v) {             int x = new integer(et1.gettext().tostring());             int y = new integer(et2.gettext().tostring());             double timetotarget = x / y;             double grav = 4.9;             double timesquared = timetotarget * timetotarget;             double drop = grav * timesquared;             time.settext("time target: " + timetotarget + " seconds");             bulletdrop.settext("bullet drop: " + drop + " meters");         }     }); } } 

ok, may problem here: double timetotarget = x / y; because x , y integer. example if x 150 , y equals 100 result of your's calculatian equals 1. try use next calculation: double timetotarget = (double)x / (double)y;