java - Converting String to Integer in Android application -

i trying convert string integer using edittext field in android, application crashes whenever try click button. string section work issue when user types integer in edittext field named number.

 package com.example.addingvalu;      import android.app.activity;     import android.os.bundle;     import android.view.menu;     import android.view.menuitem;     import android.view.view;     import android.widget.edittext;     import android.widget.toast;     public class mainactivity extends activity {          edittext number,txtval;          @override         protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.activity_main);                }           public void viewanumber(view v1)         {             txtval = (edittext) findviewbyid(r.id.stringvalue);             number = (edittext) findviewbyid(r.id.numbers_text);             //string ab;             int ed;             ed = integer.parseint(number.gettext().tostring());                   if(txtval.length() != 0)             {             toast.maketext(getbasecontext(), "string " + txtval.gettext().tostring() ,toast.length_long).show();             }             else if(number.length() !=0)             {             toast.maketext(getbasecontext(),ed, toast.length_long).show();             }         }      } 

it practice not start methods , attributes uppercase. add try/catch print possible error out , have clues on how fix it. try:

public class mainactivity extends activity {          edittext number,txtval;          @override         protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.activity_main);                }           public void viewanumber(view v1)         {             txtval = (edittext) findviewbyid(r.id.stringvalue);             number = (edittext) findviewbyid(r.id.numbers_text);             //string ab;             int ed;             ed = 0;             try{                 ed = integer.parseint(number.gettext().tostring());                  }catch(exception e){                 e.printstacktrace();             }             if(txtval.length() != 0)             {             toast.maketext(getbasecontext(), "string " + txtval.gettext().tostring() ,toast.length_long).show();             }             else if(number.length() !=0)             {             toast.maketext(getbasecontext(),ed, toast.length_long).show();             }         }      }