java - Contacts android application development -

i wrote adding contacts android app contains 1 name field , 1 number field , save button,when enter name , number , press save button add contact contact list..it working fine..but when not entered , pressed save button saving contact "noname"..for wrote if , else condition not working..please give me solution source code:

 package com.example.contacts;      import java.util.arraylist;      import android.app.activity;     import android.content.contentprovideroperation;     import android.os.bundle;     import android.provider.contactscontract;     import android.view.menu;     import android.view.view;     import android.widget.edittext;     import android.widget.toast;     //import android.view.menu;      public class contactdetails extends activity {          @override         protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.activity_contact_details);         }           @override         public boolean oncreateoptionsmenu(menu menu) {             // inflate menu; adds items action bar if present.             getmenuinflater().inflate(r.menu.contact_details, menu);             return true;         }         public void onsave(view view)         {             edittext mytext=(edittext)findviewbyid(r.id.edittext1);             string name=mytext.gettext().tostring();             toast.maketext(this,name,toast.length_long).show();             edittext mytext1=(edittext)findviewbyid(r.id.edittext2);             string number=mytext1.gettext().tostring();             toast.maketext(this,number,toast.length_long).show();             arraylist < contentprovideroperation > ops = new arraylist < contentprovideroperation > ();               ops.add(contentprovideroperation.newinsert(              contactscontract.rawcontacts.content_uri)                  .withvalue(contactscontract.rawcontacts.account_type, null)                  .withvalue(contactscontract.rawcontacts.account_name, null)                  .build());                  if (name != "") {                  ops.add(contentprovideroperation.newinsert(                  contactscontract.data.content_uri)                      .withvaluebackreference(contactscontract.data.raw_contact_id, 0)                      .withvalue(contactscontract.data.mimetype,                  contactscontract.commondatakinds.structuredname.content_item_type)                      .withvalue(                  contactscontract.commondatakinds.structuredname.display_name,                  name).build());              }                  else                  {                      toast.maketext(this, "enter valid name",toast.length_long).show();                      return;                  }                if (number != null) {                  ops.add(contentprovideroperation.                  newinsert(contactscontract.data.content_uri)                      .withvaluebackreference(contactscontract.data.raw_contact_id, 0)                      .withvalue(contactscontract.data.mimetype,                  contactscontract.commondatakinds.phone.content_item_type)                      .withvalue(contactscontract.commondatakinds.phone.number, number)                      .withvalue(contactscontract.commondatakinds.phone.type,                  contactscontract.commondatakinds.phone.type_mobile)                      .build());              }              else              {                  toast.maketext(this, "enter valid number",toast.length_long).show();                  return;         }                               try {                  getcontentresolver().applybatch(contactscontract.authority, ops);                     toast.maketext(this,"contact added",toast.length_long).show();              } catch (exception e) {                  e.printstacktrace();                  toast.maketext(this, "exception: " + e.getmessage(), toast.length_short).show();              }         }         public void oncancel(view v)         {`enter code here`             edittext et1=(edittext) findviewbyid(r.id.edittext1);             et1.settext("");             edittext et2=(edittext) findviewbyid(r.id.edittext2);             et2.settext("");          }     } 

try use checking string this

if ((!name.equals("")) && name !=null ) {                  ops.add(contentprovideroperation.newinsert(                  contactscontract.data.content_uri)                      .withvaluebackreference(contactscontract.data.raw_contact_id, 0)                      .withvalue(contactscontract.data.mimetype,                  contactscontract.commondatakinds.structuredname.content_item_type)                      .withvalue(                  contactscontract.commondatakinds.structuredname.display_name,                  name).build());              }                  else                  {                      toast.maketext(this, "enter valid name",toast.length_long).show();                      return;                  }                if (!(number.equals("")) && number !=null) {                  ops.add(contentprovideroperation.                  newinsert(contactscontract.data.content_uri)                      .withvaluebackreference(contactscontract.data.raw_contact_id, 0)                      .withvalue(contactscontract.data.mimetype,                  contactscontract.commondatakinds.phone.content_item_type)                      .withvalue(contactscontract.commondatakinds.phone.number, number)                      .withvalue(contactscontract.commondatakinds.phone.type,                  contactscontract.commondatakinds.phone.type_mobile)                      .build());              }              else              {                  toast.maketext(this, "enter valid number",toast.length_long).show();                  return;         }